SANGAMO BIOSCIENCES INC
S-1/A, 2000-04-04
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1


     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 4, 2000


                                                      REGISTRATION NO. 333-30134
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------


                                AMENDMENT NO. 3


                                       TO

                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER

                           THE SECURITIES ACT OF 1933

                           SANGAMO BIOSCIENCES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                <C>                                <C>
             DELAWARE                             8731                            68-0359556
 (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)      CLASSIFICATION CODE NUMBER)           IDENTIFICATION NUMBER)
</TABLE>

                        501 CANAL BOULEVARD, SUITE A100
                               RICHMOND, CA 94804
                                 (510) 970-6000
(ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF THE
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                             EDWARD O. LANPHIER II
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                           SANGAMO BIOSCIENCES, INC.
                        501 CANAL BOULEVARD, SUITE A100
                               RICHMOND, CA 94804
                                 (510) 970-6000
  (NAME AND ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA
                          CODE, OF AGENT FOR SERVICE)

                                   COPIES TO:

<TABLE>
<S>                                                 <C>
               JOHN W. LARSON, ESQ.                              WILLIAM J. CERNIUS, ESQ.
             ELIZABETH A. R. YEE, ESQ.                           JOSEPH G. MCCARTHY, ESQ.
          BROBECK, PHLEGER & HARRISON LLP                            LATHAM & WATKINS
                    ONE MARKET                               650 TOWN CENTER DRIVE, 20TH FLOOR
                SPEAR STREET TOWER                                 COSTA MESA, CA 92626
              SAN FRANCISCO, CA 94105                                 (714) 540-1235
                  (415) 442-0900
</TABLE>

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.

     If the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [ ]

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

     If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                            ------------------------

     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT THAT SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES EXCHANGE COMMISSION,
ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2

     THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE
     MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH
     THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT
     AN OFFER TO SELL THESE SECURITIES, AND IT IS NOT SOLICITING AN OFFER TO BUY
     THESE SECURITIES, IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.


                   SUBJECT TO COMPLETION, DATED APRIL 4, 2000


PROSPECTUS

                                5,000,000 Shares

                                 [SANGAMO LOGO]

                           SANGAMO BIOSCIENCES, INC.

                                  Common Stock

- --------------------------------------------------------------------------------

     This is our initial public offering of shares of common stock. We are
offering 5,000,000 shares. No public market currently exists for our shares. We
currently anticipate the price range for the common stock to be between $15.00
and $17.00 per share.

     We intend to apply to have our common stock approved for quotation on the
Nasdaq National Market under the symbol "SGMO."

     INVESTING IN THE SHARES INVOLVES RISK. "RISK FACTORS" BEGIN ON PAGE 5.

<TABLE>
<CAPTION>
                                                                PER
                                                               SHARE       TOTAL
                                                              --------    --------
<S>                                                           <C>         <C>
Public Offering Price.......................................  $           $
Underwriting discounts......................................  $           $
Proceeds to Sangamo.........................................  $           $
</TABLE>

     We have granted the underwriters a 30-day option to purchase up to 750,000
additional shares of common stock to cover any over-allotments.

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

     Lehman Brothers expects to deliver the shares on or about April   , 2000.

- --------------------------------------------------------------------------------

LEHMAN BROTHERS
                CHASE H&Q
                                ING BARINGS
                                             WILLIAM BLAIR & COMPANY

            , 2000
<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Prospectus Summary................    1
Risk Factors......................    5
Special Note Regarding Forward-
  Looking Statements..............   17
About This Prospectus.............   17
Use of Proceeds...................   18
Dividend Policy...................   18
Capitalization....................   19
Dilution..........................   20
Selected Financial Data...........   21
Management's Discussion and
  Analysis of Financial Condition
  and Results of Operations.......   22
</TABLE>



<TABLE>
<CAPTION>
                                    PAGE
                                    ----
<S>                                 <C>
Business..........................   26
Management........................   43
Related Party Transactions........   57
Principal Stockholders............   59
Description of Capital Stock......   61
Shares Eligible for Future Sale...   64
Underwriting......................   66
Legal Matters.....................   68
Experts...........................   69
Where You Can Find Additional
  Information.....................   69
Index to Financial Statements.....  F-1
</TABLE>





     Until              , 2000, 25 days after the date of this prospectus, all
dealers that effect transactions in these securities, whether or not
participating in this offering, may be required to deliver a prospectus. This is
in addition to the dealers' obligations to deliver a prospectus when acting as
underwriters and with respect to their unsold allotments or subscriptions.

                                        i
<PAGE>   4

                               PROSPECTUS SUMMARY

     This summary highlights some of the information found in greater detail
elsewhere in this prospectus. Unless otherwise indicated, information in this
prospectus assumes that the underwriters do not exercise their over-allotment
option, assumes the conversion of all of our preferred stock into common stock
upon effectiveness of this offering and a 2-for-1 stock split which will be
effected before completion of the offering.

     Sangamo BioSciences, Inc. is a leader in the research and development of
novel transcription factors for the regulation of genes. Genes are composed of
DNA and control the expression and transmission of all inherited traits.
Transcription factors are proteins that turn genes on and turn genes off, or
regulate gene expression, by recognizing specific DNA sequences.

     Our Universal Gene Recognition technology enables the engineering of a
class of transcription factors known as zinc finger DNA binding proteins, or
ZFPs. ZFPs are the most abundant class of transcription factors in humans and
other higher organisms and naturally function to regulate gene expression. By
engineering ZFPs so that they can recognize a specific gene, we have created ZFP
transcription factors that can control gene expression and, consequently, cell
function. We intend to establish Universal Gene Recognition as a widely used
technology for commercial applications in pharmaceutical discovery, therapeutics
for the treatment of human diseases, clinical diagnostics, and agricultural and
industrial biotechnology.


     The identification of all human genes, referred to as the sequencing of the
human genome, involves the dedication of enormous scientific and financial
resources. The accelerating pace of genetic discovery creates significant
opportunities for pharmaceutical and other life science companies. The challenge
facing these companies is how to derive medically and commercially valuable
knowledge from this large accumulation of new genetic information.


     We believe our Universal Gene Recognition technology has the potential to
address these challenges and has broad applicability to the sectors below, each
of which represents a significant target market with unmet needs:

     - Universal GeneTools for Pharmaceutical Discovery are ZFP transcription
       factors for the identification and evaluation of medically important
       genes in humans, animals and other organisms, and for improved efficiency
       in the screening of chemical compounds for pharmaceutical discovery;

     - ZFP-Therapeutics are ZFP transcription factors developed as
       pharmaceutical products to treat a broad spectrum of diseases through the
       regulation of disease-related genes;

     - ZFP-Diagnostics are developed to detect specific DNA sequences in
       clinical samples of DNA, to determine an individual's potential
       susceptibility to disease or probable response to drug therapy; and

     - ZFP Transcription Factors for Agricultural and Industrial Biotechnology
       are designed for use in the study of newly discovered plant genes,
       agrochemical discovery, the engineering of plants with improved
       properties and the biological production of industrial chemicals.

     We believe our engineered ZFP transcription factors have numerous
advantages for the regulation of gene expression including:

     - ZFP transcription factors normally and naturally regulate gene expression
       in the cells of virtually all higher organisms;

     - ZFPs can be designed to recognize unique DNA sequences resulting in the
       ability to recognize a single gene within an organism's entire genome;
                                        1
<PAGE>   5

     - ZFP transcription factors can turn on or turn off a target gene,
       enhancing their versatility;

     - ZFP transcription factors can be used to regulate gene expression in many
       different organisms including humans, animals, plants, fungi, bacteria
       and viruses; and

     - ZFP transcription factors can turn genes on and turn genes off in a
       reversible fashion, allowing regulation of gene expression for a defined
       period of time.

     To date, we have engineered hundreds of ZFP transcription factors and have
performed experiments to test their ability to recognize their target sequences
and to function in cells. We have also demonstrated the ability of ZFP
transcription factors to regulate a limited number of commercially important
genes.

     We intend to develop our Universal Gene Recognition technology for
applications in pharmaceutical discovery, therapeutics for the treatment of
human diseases, clinical diagnostics, and agricultural and industrial
biotechnology. To establish Universal Gene Recognition as a widely used
technology in life sciences industries, and to fund internal research and
development activities, we have established and will continue to pursue
collaborations with selected pharmaceutical and biotechnology companies. We have
signed Universal GeneTools agreements, which we refer to as collaborations, with
18 pharmaceutical or biotechnology companies including the following companies
or their subsidiaries:

<TABLE>
    <S>                                        <C>
    - Pfizer Inc.,                             - F. Hoffmann-La Roche Ltd.,
    - SmithKline Beecham plc,                  - Immunex Corporation,
    - Millennium Pharmaceuticals, Inc.,        - Pharmacia & Upjohn Company,
    - AstraZeneca PLC,                         - Genset SA,
    - Schering AG,                             - Warner-Lambert Company,
    - Bayer Corporation,                       - Merck KGaA,
    - Glaxo Wellcome plc,                      - Zaiya Incorporated and
    - DuPont Pharmaceuticals Company,          - Procter & Gamble Pharmaceuticals.
    - Japan Tobacco Inc.,
</TABLE>

     We have also entered into a strategic partnership with Edwards LifeScience,
Inc., formerly the CardioVascular Group of Baxter Healthcare Corporation, for
the development and commercialization of ZFP-Therapeutics in cardiovascular and
peripheral vascular diseases. Under this agreement, Baxter has purchased a $5
million convertible note which will convert into common stock upon consummation
of this offering, and we have received $1 million in initial research funding
from Baxter. Baxter has exercised an option by purchasing an additional $7.5
million convertible note which will convert into common stock upon consummation
of this offering for a right of first refusal to negotiate a license for
additional ZFP-Therapeutics in cardiovascular and peripheral vascular diseases.
We expect to enter into other strategic partnerships to accelerate the
development of ZFP transcription factors as potential pharmaceutical candidates.

     Sangamo was founded and incorporated in Delaware in 1995. Our principal
offices are located at 501 Canal Boulevard, Suite A100, Richmond, CA 94804, and
our telephone number is (510) 970-6000.
                                        2
<PAGE>   6

                                  THE OFFERING

Common stock offered by Sangamo.....     5,000,000 shares

Common stock to be outstanding after
the offering........................     22,300,147 shares

Use of proceeds.....................     For research and development, capital
                                         equipment and general corporate
                                         purposes. See "Use of Proceeds" for
                                         more information regarding our planned
                                         use of the proceeds from this offering.

Proposed Nasdaq National Market
symbol..............................     SGMO

     The number of shares of common stock to be outstanding after this offering
is based on the number of shares outstanding as of December 31, 1999 adjusted to
reflect the issuance of 333,333 shares of preferred stock in January 2000 which
converts into 666,666 shares of common stock upon consummation of this offering
and, together with accrued interest, the issuance of a $5 million note in
January 2000 and a $7.5 million note in March 2000 which convert into common
stock at the initial public offering price upon the consummation of the
offering, and excludes:

     - a total of 1,872,666 shares issuable upon the exercise of outstanding
       options at a weighted average exercise price of $0.15 per share;

     - a total of 259,962 shares issuable upon the exercise of outstanding
       warrants at a weighted average exercise price of $2.00 per share; and

     - a total of 2,400,000 shares available for future issuance under our stock
       plans.
                                        3
<PAGE>   7

                             SUMMARY FINANCIAL DATA

     The following table sets forth summary financial data for our company. You
should read this information together with the financial statements and the
notes to those statements appearing elsewhere in this prospectus and the
information under "Selected Financial Data" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations." Please see the
financial statements and the notes to the statements appearing elsewhere in this
prospectus for the determination of the number of shares used in computing the
basic and diluted and pro forma basic and diluted net loss per share.

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                                             -----------------------------------
                                                              1997        1998          1999
                                                             -------    ---------    -----------
                                                                    (IN THOUSANDS, EXCEPT
                                                                       PER SHARE DATA)
<S>                                                          <C>        <C>          <C>
STATEMENT OF OPERATIONS DATA:
Total revenues.............................................  $ 1,152     $ 2,038       $ 2,182
Operating expenses:
  Research and development.................................    1,700       4,259         4,266
  General and administrative...............................      797       1,237         1,822
                                                             -------     -------       -------
Total operating expenses...................................    2,497       5,496         6,088
                                                             -------     -------       -------
Loss from operations.......................................   (1,345)     (3,458)       (3,906)
                                                             -------     -------       -------
Interest income (expense), net.............................      (55)        173           131
                                                             -------     -------       -------
Net loss...................................................  $(1,400)    $(3,285)      $(3,775)
                                                             =======     =======       =======
Basic and diluted net loss per share.......................  $ (0.26)    $ (0.56)      $ (0.63)
                                                             =======     =======       =======
Shares used in computing basic and
  diluted net loss per share...............................    5,485       5,843         5,991
                                                             =======     =======       =======
Pro forma basic and diluted net loss per share
  (unaudited)..............................................                            $ (0.29)
                                                                                       =======
Shares used in computing pro forma basic and diluted net
  loss per share (unaudited)...............................                             13,102
                                                                                       =======
</TABLE>

     The following table is a summary of our balance sheet as of December 31,
1999. The pro forma column reflects the issuance in January 2000 of 333,333
shares of preferred stock for $1.5 million which converts into 666,666 shares of
common stock upon consummation of this offering and a $5 million note in January
2000 and a $7.5 million note in March 2000 which convert, together with accrued
interest, into common stock at the initial public offering price upon
consummation of this offering. The pro forma as adjusted column also reflects
our receipt of the estimated net proceeds from the sale of the shares of common
stock offered in this offering at an assumed initial public offering price of
$16.00 per share after deducting the estimated underwriting discount and
offering expenses payable by us. See "Use of Proceeds" and "Capitalization" and
Notes 1, 4, and 7 of Notes to Financial Statements.


<TABLE>
<CAPTION>
                                                                 AS OF DECEMBER 31, 1999
                                                           -----------------------------------
                                                                                    PRO FORMA
                                                           ACTUAL     PRO FORMA    AS ADJUSTED
                                                           -------    ---------    -----------
                                                                     (IN THOUSANDS)
<S>                                                        <C>        <C>          <C>
BALANCE SHEET DATA:
Cash, cash equivalents, and short-term investments.......  $ 7,503     $21,503       $94,703
Working capital..........................................    7,206      21,206        94,406
Total assets.............................................    9,162      23,162        96,362
Long-term debt...........................................      250         250           250
Accumulated deficit......................................   (8,785)     (8,918)       (8,918)
Total stockholders' equity...............................    7,882      21,882        95,082
</TABLE>


                                        4
<PAGE>   8

                                  RISK FACTORS

     An investment in our common stock is risky. You should carefully consider
the following risks, as well as the other information contained in this
prospectus. If any of the following risks actually occurs, it would harm our
business. In that case, the trading price of our common stock could decline, and
you might lose all or a part of your investment. The risks and uncertainties
described below are not the only ones facing us. Additional risks and
uncertainties not presently known to us or that we currently see as immaterial,
may also harm our business.

                         RISKS RELATED TO OUR BUSINESS

OUR GENE REGULATION TECHNOLOGY IS UNPROVEN AND IF WE ARE UNABLE TO USE THIS
TECHNOLOGY IN ALL OUR INTENDED APPLICATIONS, IT WOULD LIMIT OUR REVENUE
OPPORTUNITIES.

     Our technology involves new and unproven approaches to gene regulation.
Although we have generated some ZFP transcription factors for some gene
sequences, we have not created ZFP transcription factors for all gene sequences
and we may not be able to create ZFP transcription factors for all gene
sequences which would limit the usefulness of our technology. In addition, while
we have demonstrated the function of engineered ZFP transcription factors in
cell cultures, we have not done so in animals and humans and many other
organisms, and the failure to do so could restrict our ability to develop
commercially viable products. If we and our Universal Gene Tools collaborators
or strategic partners are unable to extend our results to new gene sequences and
experimental animal models, we may be unable to use our technology in all its
intended applications. Also, delivery of ZFP transcription factors into cells in
these and other environments is limited by a number of technical challenges,
which we may be unable to surmount.

     The utility of our ZFP transcription factors is in part based on the belief
that the regulation of gene expression may help scientists better understand the
role of human, animal, plant and other genes in drug discovery, as well as
therapeutic, diagnostic, agricultural and industrial biotechnology applications.
There is only a limited understanding of the role of genes in all these fields.
Life sciences companies have developed or commercialized only a few products in
any of these fields based on results from genomic research or the ability to
regulate gene expression. We, our Universal GeneTools collaborators or our
strategic partners may not be able to use our technology to identify and
validate drug targets or other targets in order to develop commercial products.

IF OUR TECHNOLOGY DOES PROVE TO BE EFFECTIVE, IT STILL MAY NOT LEAD TO
COMMERCIALLY VIABLE PRODUCTS, WHICH WOULD REDUCE OUR REVENUE OPPORTUNITIES.

     Even if our Universal GeneTools collaborators or strategic partners are
successful in identifying drug targets or other targets based on discoveries
made using our ZFP transcription factors, they may not be able to discover or
develop commercially viable products or may determine to pursue products that do
not use our technology. To date, no company has developed or commercialized any
therapeutic, diagnostic, agricultural or industrial biotechnology products based
on our technology. The failure of our technology to provide safe, effective,
useful or commercially viable approaches to the discovery and development of
these products would significantly limit our business plan and future growth.

                                        5
<PAGE>   9

INITIAL EVALUATIONS OF OUR ENGINEERED ZFP TRANSCRIPTION FACTORS DELIVERED TO OUR
UNIVERSAL GENETOOLS COLLABORATORS HAVE PRODUCED MIXED RESULTS.


     Some of our Universal GeneTools collaborators have been able to confirm the
potential utility of our gene regulation technology. Two of our collaborators,
Immunex Corporation and Millennium Pharmaceuticals, Inc., however, have not yet
been able to regulate gene expression using our technology. We have taken steps
to ascertain the reasons for these initial observations. We continue to work
with these collaborators to address and remedy any issues that may be associated
with the ZFP transcription factors, including redesign of the ZFP transcription
factors. These collaborators continue to evaluate our technology. Further, most
of our collaborators have not yet started testing or have not yet generated the
final results of their testing. The ZFP transcription factors that we have
generated for our other collaborators or our strategic partner may not function
as intended and the ZFP transcription factors engineered in the future for other
collaborators or strategic partners may not function as intended. If we are
unsuccessful in engineering ZFP transcription factors that achieve positive
results for our collaborators or strategic partners, this would significantly
harm our business by reducing our revenues.


IF OUR COMPETITORS DEVELOP, ACQUIRE OR MARKET TECHNOLOGIES OR PRODUCTS THAT ARE
MORE EFFECTIVE THAN OURS, THIS WOULD REDUCE OR ELIMINATE OUR COMMERCIAL
OPPORTUNITY.

     Any products that we or our collaborators or strategic partners develop
using our Universal Gene Regulation technology platform will participate in
highly competitive markets. Even if we are able to generate ZFP transcription
factors that achieve useful results, competing technologies may prove to be more
effective or less expensive which would limit or eliminate our revenue
opportunities. Competing technologies may include other methods of regulating
gene expression. Universal Gene Recognition has broad application in the life
sciences, and competes with a broad array of new technologies and approaches
being applied to genetic research by many companies. Competitive technologies
include those used to map and sequence DNA, analyze the expression of genes in
cells or tissues, determine gene function, discover new genes, analyze genetic
information and regulate genes. Our competitors include biotechnology companies
with:

     - competing proprietary technology;

     - substantially greater capital resources than ours;

     - larger research and development staffs and facilities than ours;

     - greater experience in product development and in obtaining regulatory
       approvals and patent protection; and

     - greater manufacturing and marketing capabilities than we do.

     These organizations also compete with us to:

     - attract qualified personnel;

     - attract parties for acquisitions, joint ventures or other collaborations;
       and

     - license the proprietary technologies of academic and research
       institutions that are competitive with our technology which may preclude
       us from pursuing similar opportunities.

     Accordingly, our competitors may succeed in obtaining patent protection or
commercializing products before us. In addition, any products that we develop
may compete with existing products or services that are well-established in the
marketplace.

                                        6
<PAGE>   10

FAILURE TO ATTRACT, RETAIN AND MOTIVATE SKILLED PERSONNEL AND CULTIVATE KEY
ACADEMIC COLLABORATIONS WILL DELAY OUR PRODUCT DEVELOPMENT PROGRAMS AND OUR
RESEARCH AND DEVELOPMENT EFFORTS.

     We are a small company with 45 employees, and our success depends on our
continued ability to attract, retain and motivate highly qualified management
and scientific personnel, and our ability to develop and maintain important
relationships with leading academic and other research institutions and
scientists. Competition for personnel and academic and other research
collaborations is intense. The success of our technology development programs
depends on our ability to attract and retain highly trained personnel. If we
lose the services of personnel with these types of skills, it could impede
significantly the achievement of our research and development objectives. If we
fail to negotiate additional acceptable collaborations with academic and other
research institutions and scientists, or if our existing collaborations are
unsuccessful, our technology development programs may be delayed or may not
succeed.

     At present the scope of our needs is somewhat limited to the expertise of
personnel who are able to engineer ZFP transcription factors and apply them to
gene regulation. In the future, we will need to hire additional personnel and
develop additional academic collaborations as we continue to expand our research
and development activities and to work on some of our planned projects because
these activities and projects will require additional expertise in disciplines
applicable to the products we would develop with them. Further, our planned
activities will require existing management to develop additional expertise. We
do not know if we will be able to attract, retain or motivate the required
personnel to achieve our goals.

WE MAY HAVE DIFFICULTY MANAGING OUR GROWTH, WHICH MAY SLOW OUR GROWTH RATE OR
GIVE RISE TO INEFFICIENCIES WHICH WOULD REDUCE OUR PROFITS.

     We have recently experienced, and expect to continue to experience, growth
in the number of our employees and the scope of our operating and financial
systems. This growth has resulted in an increase in responsibilities for both
existing and new management personnel. Our ability to manage growth effectively
will require us to continue to implement and improve our operational, financial
and management information systems and to recruit, train, motivate and manage
our employees. We may not be able to manage our growth and expansion, and the
failure to do so may slow our growth rate or give rise to inefficiencies which
would reduce our profits.

WE ARE AT AN EARLY STAGE OF DEVELOPMENT AND MAY NOT SUCCEED OR BECOME
PROFITABLE.

     We began operations in 1995 and are at an early stage of development. We
have incurred significant losses to date, and our revenues have been limited to
federal government research grants and Universal GeneTools collaborators and a
strategic partner. Our Universal GeneTools collaborators are evaluating our
initial ZFP transcription factors. If the initial ZFP transcription factors do
not provide sufficient value to those collaborators, then they may not continue
to work with us. This may also impair our ability to attract additional
collaborators. As a result, our business is subject to all of the risks inherent
in the development of a new technology, which includes the need to:

     - attract additional new Universal GeneTools collaborators and strategic
       partners;

     - attract and retain qualified scientific and technical staff and
       management, particularly scientific staff with expertise to further apply
       and develop our early stage technology;

     - attract and enter into research collaborations with academic and other
       research institutions and scientists;

     - obtain sufficient capital to support the expense of developing our
       technology platform and developing, testing and commercializing products;

                                        7
<PAGE>   11

     - develop a market for our products; and

     - successfully transition from a company with a research focus to a company
       capable of supporting commercial activities.


     In addition to competitive pressures, problems frequently encountered with
research, development and commercialization of new technologies and products
will likely affect us. Most of our ZFP design and testing procedures take place
on a relatively small scale. In the future, we intend to apply ZFP design and
testing procedures at a scale involving hundreds of genes per year. We may not
be able to successfully or efficiently achieve this scale. In addition, while we
have had success in applying ZFP gene regulation in our laboratories, we may
have difficulty in transferring our technology to our collaborators' and
strategic partners' laboratories.


WE ANTICIPATE CONTINUING TO INCUR OPERATING LOSSES FOR AT LEAST TWO YEARS. IF
MATERIAL LOSSES CONTINUE FOR A LONGER PERIOD, WE MAY BE UNABLE TO CONTINUE OUR
OPERATIONS.

     We have generated operating losses since we began operations in 1995. The
extent of our future losses and the timing of profitability are highly
uncertain, and we may not be profitable in the foreseeable future. We have been
engaged in developing our Universal Gene Recognition technology since inception,
which has and will continue to require significant research and development
expenditures. To date, we have generated our revenues from federal government
research grants, Universal GeneTools collaboration agreements and a strategic
partnership agreement. As of December 31, 1999, we had an accumulated deficit of
approximately $8.8 million. Even if we succeed in increasing our current product
and research revenue or developing additional commercial products, we expect to
incur losses in the near future and may continue to incur losses for at least
the next two years. These losses may increase as we expand our research and
development activities. If the time required to generate significant product
revenues and achieve profitability is longer than we currently anticipate, we
may not be able to sustain our operations.


WE MAY REQUIRE FINANCING BEYOND THE PROCEEDS OF THIS OFFERING. IF WE ARE UNABLE
TO OBTAIN THIS FINANCING, WE WILL BE UNABLE TO DEVELOP OUR TECHNOLOGY AND
PRODUCTS.



     We do not know whether we will require additional financing, or that, if
acquired, it will be on terms favorable to our stockholders or us. We have
consumed substantial amounts of cash to date and expect capital outlays and
operating expenditures to increase over the next several years as we expand our
infrastructure and research and development activities. We may raise this
financing through public or private financings or additional Universal GeneTools
collaborations, strategic partnerships or licensing arrangements. If additional
financing becomes necessary in the future, it would likely be at least tens of
millions of dollars.



     While we believe our current financial resources and the proceeds of this
offering should be adequate to sustain our operations for two years, it is not
possible to estimate our financial requirements thereafter. However, to the
extent we concentrate our efforts on proprietary human therapeutics, we will
require FDA approval and extensive clinical trials of our potential products.
This process may cost in excess of $100 million per product.


OUR TECHNOLOGY INFRASTRUCTURE IS NOT YET COMPLETE AND ANY DELAY OR FAILURE TO
COMPLETE IT COULD PREVENT US FROM EFFICIENTLY DELIVERING ZFP TRANSCRIPTION
FACTORS TO OUR UNIVERSAL GENETOOLS COLLABORATORS OR STRATEGIC PARTNERS.

     Part of our strategy involves building additional technology infrastructure
to support our Universal Gene Recognition technology. This strategy includes the
continued research and

                                        8
<PAGE>   12

development of improved and automated processes for design and production of our
ZFP transcription factors. In addition, we intend to continue to assemble large
collections, or libraries, of ZFPs for use in pharmaceutical target discovery.
Because this infrastructure is an important part of our platform, any delay or
failure to complete it could slow our growth and our ability to advance our
strategic initiatives.

OUR UNIVERSAL GENETOOLS COLLABORATION AGREEMENTS WITH COMPANIES ARE OF LIMITED
SCOPE, AND IF WE ARE NOT ABLE TO EXPAND THE SCOPE OF OUR EXISTING COLLABORATIONS
OR ENTER INTO NEW ONES, OUR REVENUES WILL BE NEGATIVELY IMPACTED AND OUR
RESEARCH INITIATIVES MAY BE SLOWED OR HALTED.


     Our Universal GeneTools collaborations are important to us because they
permit us to introduce our technology to many companies by supplying them with a
specified ZFP transcription factor for a payment without licensing any of our
technology. The collaboration agreements, however, are of limited scope. Under
most of our current Universal GeneTools collaborations we receive a payment for
supplying ZFP transcription factors for gene targets specified by the companies.
These companies are not obligated to make continuing payments to us in
connection with their research efforts or to pursue any product development
program with us. As a result, we may not develop long-term relationships with
these companies that could lead to additional revenues. If we are not able to
expand the scope of our existing collaborations or enter into new ones, we may
have reduced revenues and be forced to slow or halt research initiatives.


COMMERCIALIZATION OF OUR TECHNOLOGIES DEPENDS ON STRATEGIC PARTNERING WITH OTHER
COMPANIES, AND IF WE ARE NOT ABLE TO FIND STRATEGIC PARTNERS IN THE FUTURE, WE
MAY NOT BE ABLE TO DEVELOP OUR TECHNOLOGIES OR PRODUCTS, WHICH COULD SLOW OUR
GROWTH AND DECREASE OUR REVENUES.


     We expect to rely, to some extent, on our strategic partners to provide
funding in support of our research and to perform some independent research,
preclinical and clinical testing. We currently have only one strategic partner.
Our technology is broad based and we do not currently possess the resources
necessary to develop and commercialize potential products that may result from
our technologies, or the resources or capabilities to complete any approval
processes that may be required for the products, therefore we must enter into
additional strategic partnerships to develop and commercialize products. Of the
thousands of ZFP transcription factors which target specific genes, our current
18 collaborators and strategic partner are working with less than 100, therefore
in order to fully utilize our ZFP transcriptions factors we would need a number
of new Universal GeneTools collaborators and strategic partners to accomplish
our research.



     We may require significant time to secure additional collaborations or
strategic partners because we need to effectively market the benefits of our
technology to these future collaborators and strategic partners, which uses the
time and efforts of research and development personnel and our management.
Further, each collaboration or strategic partnering arrangement will involve the
negotiation of terms that may be unique to each collaborator or strategic
partner. These business development efforts may not result in a collaboration or
strategic partnership.



     If we do not enter into additional strategic partnering agreements, we will
experience reduced revenues and may not develop or commercialize our products.
The loss of our current or any future strategic partnering agreement would not
only delay or terminate the potential development or commercialization of any
products we may derive from our technologies but also delay or terminate our
ability to test ZFP transcription factors for specific genes. If any strategic
partner fails to conduct the collaborative activities successfully and in a
timely manner, the preclinical or clinical development or commercialization of
the affected product candidates or research programs could be delayed or
terminated.


                                        9
<PAGE>   13

     Our existing strategic partnering agreement is, and we would expect any
future arrangement to be based on the achievement of milestones. Under the
strategic partnering agreements, we expect to receive revenue for the research
and development of a therapeutic product based on achievement of specific
milestones. Achieving these milestones will depend, in part, on the efforts of
our strategic partner as well as our own. In contrast, our current Universal
GeneTools collaboration agreements only pay us to supply ZFP transcription
factors for the collaborator's independent use, rather than for future results
of the collaborator's efforts. If we or any strategic partner fails to meet
specific milestones, then the strategic partnership can be terminated which
could decrease our revenues.

OUR UNIVERSAL GENETOOLS COLLABORATORS AND STRATEGIC PARTNERS MAY DECIDE TO ADOPT
ALTERNATIVE TECHNOLOGIES OR MAY BE UNABLE TO DEVELOP COMMERCIALLY VIABLE
PRODUCTS USING OUR TECHNOLOGY, WHICH WOULD NEGATIVELY IMPACT OUR REVENUES AND
OUR STRATEGY TO DEVELOP THESE PRODUCTS.

     Our collaborators or strategic partners may adopt the alternative
technology of our competitors which could decrease the marketability of our
technology. Because many of our Universal GeneTools collaborators or strategic
partners are likely to be working on more than one research project, they could
choose to shift their resources to projects other than those they are working on
with us. If they do so, that would delay our ability to test our technology and
would delay or terminate the development of potential products based on our gene
regulation technology. Further, our collaborators and strategic partners may
elect not to develop products arising out of our collaborative and strategic
partnering arrangements or to devote sufficient resources to the development,
manufacturing, marketing or sale of these products. If any of these events
occur, we may not be able to develop our technologies or commercialize our
products.

WE INTEND TO CONDUCT PROPRIETARY RESEARCH PROGRAMS TO DISCOVER THERAPEUTIC
PRODUCT CANDIDATES. THESE PROGRAMS INCREASE OUR RISK OF PRODUCT FAILURE, MAY
SIGNIFICANTLY INCREASE OUR RESEARCH EXPENDITURES, AND MAY INVOLVE CONFLICTS WITH
OUR COLLABORATORS AND STRATEGIC PARTNERS.

     Conducting proprietary research programs may not generate corresponding
revenue and may create conflicts with our collaborators or strategic partners.
The implementation of this strategy will involve substantially greater business
risks and the expenditure of significantly greater funds than our current
research activities. In addition, these programs will require substantial
commitments of time from our management and staff. Moreover, we have no
experience in preclinical or clinical testing, obtaining regulatory approval or
commercial-scale manufacturing and marketing of therapeutic products, and we
currently do not have the resources or capability to manufacture therapeutic
products on a commercial scale. In order for us to commercialize these products
directly, we would need to develop, or obtain through outsourcing arrangements,
the capability to execute all of these functions, market and sell products. We
do not have these capabilities, and we may not be able to develop or otherwise
obtain the requisite preclinical, clinical, regulatory, manufacturing, marketing
and sales capabilities.

     In addition, disagreements with our Universal GeneTools collaborators or
strategic partners could develop over rights to our intellectual property with
respect to our proprietary research activities. Any conflict with our
collaborators or strategic partners could reduce our ability to enter into
future collaboration or strategic partnering agreements and negatively impact
our relationship with existing collaborators and strategic partners, which could
reduce our revenue and delay or terminate our product development.

                                       10
<PAGE>   14

BECAUSE IT IS DIFFICULT AND COSTLY TO PROTECT OUR PROPRIETARY RIGHTS, AND THIRD
PARTIES HAVE FILED PATENT APPLICATIONS THAT ARE SIMILAR TO OURS, WE CANNOT
ENSURE THE PROPRIETARY PROTECTION OF OUR TECHNOLOGIES AND PRODUCTS.

     Our commercial success will depend in part on obtaining patent protection
of our technology and successfully defending these patents against third party
challenges. The patent positions of pharmaceutical and biotechnology companies
can be highly uncertain and involve complex legal and factual questions. No
consistent policy regarding the breadth of claims allowed in biotechnology
patents has emerged to date. Accordingly, we cannot predict the breadth of
claims allowed in patents we own or license.


     We are a party to various license agreements that give us rights under
specified patents and patent applications. We currently hold an exclusive
sublicense for ZFP transcription factor technology which is limited to using the
technology in human and animal healthcare. The scope of this license may be
subject to dispute. We may need to license additional rights to commercialize
our technology outside human and animal healthcare. We will seek to obtain a
sublicense to these patent applications for use in our agricultural and
industrial biotechnology efforts. If we are not able, however, to license these
additional rights, it could harm our business. Similarly, our current licenses,
and our future licenses will, contain performance obligations. If we fail to
meet those obligations, the licenses could be terminated. If we are unable to
continue to license these technologies on commercially reasonable terms, or at
all, we may be forced to delay or terminate our product development and research
activities.


     With respect to our present and any future sublicenses, since our rights
derive from those granted to our sublicensor, we are subject to the risk that
our sublicensor may fail to perform its obligations under the master license or
fail to inform us of useful improvements in, or additions to, the underlying
intellectual property owned by the original licensor.

     We are unable to exercise the same degree of control over intellectual
property that we license from third parties as we exercise over our internally
developed intellectual property. We generally do not control the prosecution of
patent applications that we license from third parties; therefore, the patent
applications may not be prosecuted in a timely manner.

     The degree of future protection for our proprietary rights is uncertain and
we cannot ensure that:

     - we or our licensors were the first to make the inventions covered by each
       of our pending patent applications;

     - we or our licensors were the first to file patent applications for these
       inventions;

     - others will not independently develop similar or alternative technologies
       or reverse engineer any of our products, processes or technologies;

     - any of our pending patent applications will result in issued patents;

     - any patents issued or licensed to us or our Universal GeneTools
       collaborators or strategic partners will provide a basis for commercially
       viable products or will provide us with any competitive advantages or
       will not be challenged and invalidated by third parties;

     - we will develop additional products, processes or technologies that are
       patentable; or

     - the patents of others will not have an adverse effect on our ability to
       do business.

     Others have filed and in the future are likely to file patent applications
that are similar to ours. We are aware that there are academic groups and other
companies that are attempting to develop technology which is based on the use of
zinc finger and other DNA binding proteins, and that these groups and companies
have filed patent applications. Several patents have been issued, although

                                       11
<PAGE>   15

Sangamo has no current plans to use the associated inventions. More
particularly, we are aware of pending patent applications with claims directed
to zinc finger libraries and methods of designing zinc finger DNA binding
proteins. These applications are not issued patents. If the pending claims were
granted in their present form, however, they could interfere with our right to
commercialize our products and processes. If these or other patents issue, it is
possible that the holder of any patent or patents granted on these applications
may bring an infringement action against our collaborators, strategic partner or
us claiming damages and seeking to enjoin commercial activities relating to the
affected products and processes. The costs of litigating the claim could be
substantial. Moreover, we cannot predict whether our Universal GeneTools
collaborators, strategic partners or we would prevail in any actions. In
addition, if the relevant patent claims were upheld as valid and enforceable and
our products or processes were found to infringe the patent or patents, we could
be prevented from making, using or selling the relevant product or process
unless we could obtain a license or were able to design around the patent
claims. While we believe that our proprietary intellectual property would give
us substantial leverage to secure a cross-license, it is uncertain that any
license required under that patent or patents would be made available on
commercially acceptable terms, if at all. We believe that there may be
significant litigation in the genomics industry regarding patent and other
intellectual property rights which could subject us to litigation. If we become
involved in litigation, it could consume a substantial portion of our managerial
and financial resources.

     We have received unsolicited invitations to license existing patented
technology from a number of third parties, at least one of which contained an
allegation of infringement. Upon careful analysis of each of these technologies,
we have determined that we already own rights to these technologies or that our
scientific and commercial interests would not benefit from the acquisition of
rights to these technologies. Further, we believe that the making, using or
selling of our products and processes need not infringe any claims in the
proffered patents. Accordingly, we have declined to enter into license
negotiations with these parties. It is possible, however, that these parties
will bring future actions against us, our Universal GeneTools collaborators or
our strategic partners alleging infringement of their patents. As detailed
above, the outcome of any litigation, particularly lawsuits involving
biotechnology patents, is difficult to predict and likely to be costly
regardless of the outcome. In these circumstances, the risks of a negative
impact on our business can neither be clearly defined nor entirely eliminated.

     We rely on trade secrets to protect technology where we believe patent
protection is not appropriate or obtainable. Trade secrets, however, are
difficult to protect. While we require employees, academic collaborators and
consultants to enter into confidentiality agreements, we may not be able to
adequately protect our trade secrets or other proprietary information or enforce
these confidentiality agreements.


     Our Universal GeneTools collaborators, strategic partners and scientific
advisors have rights to publish data and information in which we may have
rights. If we cannot maintain the confidentiality of our technology and other
confidential information in connection with our collaborations and strategic
partnerships, then we may not be able to receive patent protection or protect
our proprietary information. See "Business -- Intellectual Property and
Technology Licenses."


OUR POTENTIAL THERAPEUTIC PRODUCTS ARE SUBJECT TO A LENGTHY AND UNCERTAIN
REGULATORY PROCESS, AND IF THESE POTENTIAL PRODUCTS ARE NOT APPROVED, WE WILL
NOT BE ABLE TO COMMERCIALIZE THOSE PRODUCTS.

     The Food and Drug Administration, or FDA, must approve any therapeutic and
some diagnostic products based on ZFP technology before it can be marketed in
the United States. The process for receiving regulatory approval is long and
uncertain, and even if we had a potential product, this product may not
withstand the rigors of testing under the regulatory approval processes.

                                       12
<PAGE>   16

     Before commencing clinical trials in humans, we must submit and receive
approval from the FDA of an Investigational New Drug Application. Clinical
trials are subject to oversight by institutional review boards and the FDA and
these trials must meet particular conditions, such that they:

     - must be conducted in conformance with the FDA's good clinical practice
       regulations;

     - must meet requirements for institutional review board oversight;

     - must meet requirements for informed consent;

     - are subject to continuing FDA oversight;

     - may require large numbers of test subjects; and

     - may be suspended by us or the FDA at any time if it is believed that the
       subjects participating in these trials are being exposed to unacceptable
       health risks or if the FDA finds deficiencies in the Investigational New
       Drug application or the conduct of these trials.


     We must also demonstrate that the product is safe and effective in the
patient population that will be treated. Data obtained from preclinical and
clinical activities are susceptible to varying interpretations that could delay,
limit or prevent regulatory clearances. In addition, we may encounter delays or
rejections based upon additional government regulation from future legislation
or administrative action or changes in FDA policy during the period of product
development, clinical trials and FDA regulatory review. Failure to comply with
applicable FDA or other applicable regulatory requirements may result in
criminal prosecution, civil penalties, recall or seizure of products, total or
partial suspension of production or injunction, as well as other regulatory
action against our potential products or us. Additionally, we have no experience
in conducting and managing the clinical trials necessary to obtain regulatory
approval.


     In addition, we may also require approval from the Recombinant DNA Advisory
Committee, or RAC, which is the advisory board to the National Institutes of
Health, or NIH, focusing on clinical trials involving gene transfer.

     We have not submitted an application with the FDA or any other regulatory
authority for any product candidate, and neither the FDA nor any other
regulatory authority has approved any therapeutic, diagnostic, agricultural or
industrial product candidate developed with our technology for commercialization
in the United States or elsewhere.

REGULATORY APPROVAL, IF GRANTED, MAY BE LIMITED TO SPECIFIC USES OR GEOGRAPHIC
AREAS WHICH COULD LIMIT OUR ABILITY TO GENERATE REVENUES.


     Regulatory approval may limit the indicated use for which we can market a
product. Further, once regulatory approval for a product is obtained, it and its
manufacturer are subject to continual review. Discovery of previously unknown
problems with a product or manufacturer may result in restrictions on the
product, manufacturer and manufacturing facility, including withdrawal of the
product from the market. In Japan and Europe, regulatory agencies also set or
approve prices.



     Even if regulatory clearance of a product is granted, this clearance is
limited to those specific states and conditions for which the product is useful
as demonstrated through clinical trials. We cannot ensure that any therapeutic
product developed by us, alone or with others, will prove to be safe and
effective in clinical trials and will meet all of the applicable regulatory
requirements needed to receive marketing clearance.


     Outside the United States, our ability to market a product is contingent
upon receiving a marketing authorization from the appropriate regulatory
authorities so we cannot predict whether or

                                       13
<PAGE>   17

when we would be permitted to commercialize our product. These foreign
regulatory approval processes include all of the risks associated with FDA
clearance described above.

LAWS OR PUBLIC SENTIMENT MAY LIMIT OUR PRODUCTION OF GENETICALLY ENGINEERED
AGRICULTURAL PRODUCTS IN THE FUTURE, AND THESE LAWS COULD REDUCE OUR ABILITY TO
SELL THESE PRODUCTS.

     Genetically engineered products are currently subject to public debate and
heightened regulatory scrutiny, either of which could prevent or delay
production of agricultural products. We may develop genetically engineered
agricultural products for ourselves or with our strategic partners. The field
testing, production and marketing of genetically engineered plants and plant
products are subject to federal, state, local and foreign governmental
regulation. Regulatory agencies administering existing or future regulations or
legislation may not allow production and marketing of our genetically engineered
products in a timely manner or under technically or commercially feasible
conditions. In addition, regulatory action or private litigation could result in
expenses, delays or other impediments to our product development programs or the
commercialization of resulting products.

     The FDA currently applies the same regulatory standards to foods developed
through genetic engineering as applied to foods developed through traditional
plant breeding. Genetically engineered food products, however, will be subject
to premarket review if these products raise safety questions or are deemed to be
food additives. Governmental authorities could also, for social or other
purposes, limit the use of genetically engineered products created with our gene
regulation technology.

     Even if we are able to obtain regulatory approval of genetically engineered
products, our success will also depend on public acceptance of the use of
genetically engineered products including drugs, plants and plant products.
Claims that genetically engineered products are unsafe for consumption or pose a
danger to the environment may influence public attitudes. Our genetically
engineered products may not gain public acceptance. The subject of genetically
modified organisms has received negative publicity in Europe, which has aroused
public debate. The adverse publicity in Europe could lead to greater regulation
and trade restrictions on imports of genetically altered products. If similar
adverse public reaction occurs in the United States, genetic research and its
resulting products could be subject to greater domestic regulation and could
decrease the demand for our technology and products.

IF CONFLICTS ARISE BETWEEN US AND OUR COLLABORATORS, STRATEGIC PARTNERS,
SCIENTIFIC ADVISORS OR DIRECTORS, THESE PARTIES MAY ACT IN THEIR SELF-INTEREST,
WHICH MAY LIMIT OUR ABILITY TO IMPLEMENT OUR STRATEGIES.

     If conflicts arise between us and our corporate or academic collaborators,
strategic partners or scientific advisors or directors, the other party may act
in its self-interest which may limit our ability to implement our strategies.
Some of our Universal GeneTools or academic collaborators or strategic partners
are conducting multiple product development efforts within each area that is the
subject of the collaboration with us. Generally, in each of our collaborations,
we have agreed not to conduct independently, or with any third party, any
research that is competitive with the research conducted under our
collaborations. Our collaborations may cause us to limit the areas of research
that we pursue, either alone or with others. Our collaborators or strategic
partners, however, may develop, either alone or with others, products in related
fields that are competitive with the products or potential products that are the
subject of these collaborations. Competing products, either developed by the
collaborators or strategic partners or to which the collaborators or strategic
partners have rights, may result in their withdrawal of support for our product
candidates.

     Some of our collaborators or strategic partners could also become
competitors in the future. Our collaborators or strategic partners could develop
competing products, preclude us from entering into collaborations with their
competitors, fail to obtain timely regulatory approvals, terminate their

                                       14
<PAGE>   18

agreements with us prematurely or fail to devote sufficient resources to the
development and commercialization of products. Any of these developments could
harm our product development efforts.

OUR COLLABORATIONS WITH OUTSIDE SCIENTISTS MAY BE SUBJECT TO CHANGE WHICH COULD
LIMIT OUR ACCESS TO THEIR EXPERTISE.

     We work with scientific advisors and collaborators at academic research
institutions. These scientists are not our employees and may have other
commitments that would limit their availability to us. Although our scientific
advisors generally agree not to do competing work, if a conflict of interest
between their work for us and their work for another entity arises, we may lose
their services. Although our scientific advisors and academic collaborators sign
agreements not to disclose our confidential information, it is possible that
some of our valuable proprietary knowledge may become publicly known through
them.

IF WE USE BIOLOGICAL AND HAZARDOUS MATERIALS IN A MANNER THAT CAUSES INJURY OR
VIOLATES LAWS, WE MAY BE LIABLE FOR DAMAGES.

     Our research and development activities involve the controlled use of
potentially harmful biological materials as well as hazardous materials,
chemicals and various radioactive compounds. We cannot completely eliminate the
risk of accidental contamination or injury from the use, storage, handling or
disposal of these materials. In the event of contamination or injury, we could
be held liable for damages that result, and any liability could exceed our
resources. We are subject to federal, state and local laws and regulations
governing the use, storage, handling and disposal of these materials and
specified waste products. The cost of compliance with these laws and regulations
could be significant.

ANTI-TAKEOVER PROVISIONS IN OUR CERTIFICATE OF INCORPORATION AND DELAWARE LAW
COULD PREVENT A POTENTIAL ACQUIROR FROM BUYING YOUR STOCK.

     Anti-takeover provisions of Delaware law, in our certificate of
incorporation and equity benefit plans may make a change in control of our
company more difficult, even if a change in control would be beneficial to our
stockholders. These provisions may allow our board of directors to prevent or
make changes in the management and control of our company. In particular, our
board of directors will be able to issue up to 5,000,000 shares of preferred
stock with rights and privileges that might be senior to our common stock,
without the consent of the holders of the common stock. Further, without any
further vote or action on the part of the stockholders, the board of directors
will have the authority to determine the price, rights, preferences, privileges
and restrictions of the preferred stock. This preferred stock, if it is ever
issued, may have preference over and harm the rights of the holders of common
stock. Although the issuance of this preferred stock will provide us with
flexibility in connection with possible acquisitions and other corporate
purposes, this issuance may make it more difficult for a third party to acquire
a majority of our outstanding voting stock. Similarly, our authorized but
unissued common stock is available for future issuance without stockholder
approval.

     In addition, our certificate of incorporation:

     - states that stockholders may not act by written consent but only at a
       stockholders' meeting;

     - establishes advance notice requirements for nominations for election to
       the board of directors or proposing matters that can be acted upon at
       stockholders' meetings; or

     - limits who may call a special meeting of stockholders.

                                       15
<PAGE>   19

                         RISKS RELATED TO THIS OFFERING

OUR STOCK PRICE MAY BE VOLATILE, WHICH COULD RESULT IN SUBSTANTIAL LOSSES FOR
INVESTORS PURCHASING SHARES IN THIS OFFERING.

     Volatility in the biotechnology market could cause you to incur substantial
losses. Prior to this offering, you could not buy or sell our common stock
publicly. An active public market for our common stock may not develop or be
sustained after this offering. We will negotiate and determine the initial
public offering price with the representatives of the underwriters based on
several factors. In addition, the market price of our common stock may be highly
volatile. The market prices of securities of biotechnology companies are
currently highly volatile. The market price of our common stock may fluctuate
significantly in response to the following factors, some of which are beyond our
control:

     - changes in market valuations of similar companies, since many
       biotechnology companies have recently registered their securities to
       trade publicly and may create a more volatile trading sector;

     - announcements by us or our competitors of new or enhanced products,
       technologies or services or significant contracts, acquisitions,
       strategic relationships, joint ventures or capital commitments;

     - regulatory developments;

     - additions or departures of key personnel;

     - deviations in our results of operations from the estimates of securities
       analysts; and

     - future sales of our common stock or other securities.

OUR STOCK PRICE COULD BE ADVERSELY AFFECTED BY ADDITIONAL SHARES BECOMING
AVAILABLE FOR SALE.

     Sales of a substantial number of shares of our common stock, or the
perception that these sales could occur, could depress the market price of our
common stock and could impair our ability to raise capital through the sale of
additional equity securities. In addition, we have entered into registration
rights agreements with some investors that entitle these investors to have their
shares registered for sale in the public market. The exercise of these rights
could affect the market price of our common stock. See "Shares Eligible for
Future Sale" for further information concerning potential sales of our shares
after this offering.

PURCHASERS IN THIS OFFERING WILL INCUR IMMEDIATE AND SUBSTANTIAL DILUTION.

     We expect that the initial public offering price of our common stock will
be substantially higher than the book value per share of the outstanding common
stock. As a result, you will incur immediate and substantial dilution of $11.73
per share in the net tangible book value per share of common stock from the
initial public offering price. In the past, we issued options and warrants to
acquire common stock at prices significantly below the initial public offering
price. The exercise of options and warrants currently outstanding could cause
additional, substantial dilution to you. See "Dilution" for more detailed
information regarding the potential dilution you may incur.

INSIDERS WILL CONTINUE TO HAVE SUBSTANTIAL CONTROL OVER SANGAMO AFTER THIS
OFFERING AND COULD DELAY OR PREVENT A CHANGE IN CORPORATE CONTROL.

     The interest of management could conflict with the interest of our other
stockholders. Upon completion of this offering, our executive officers,
directors and principal stockholders will beneficially

                                       16
<PAGE>   20

own, in the aggregate, approximately 31.3% of our outstanding common stock. As a
result, these stockholders, if they choose to act together, will be able to
exercise control over all matters requiring stockholder approval, including the
election of directors and approval of significant corporate transactions. This
could have the effect of delaying or preventing a change of control of Sangamo,
which in turn could reduce the market price of our stock.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS


     Some statements contained in this prospectus are forward-looking with
respect to our operations, economic performance and financial condition.
Statements that are forward-looking in nature should be read with caution
because they involve risks and uncertainties, they are included, for example, in
specific and general discussions about:


     - our strategy;

     - sufficiency of our cash resources;

     - revenues from existing and new collaborations;

     - product development;

     - our research and development and other expenses;

     - our operational and legal risks; and

     - our plans, objectives, expectations and intentions and any other
       statements that are not historical facts.


     Various terms and expressions similar to them are intended to identify
these cautionary statements. These terms include: "anticipates," "believes,"
"continues," "could," "estimates," "expects," "intends," "may," "plans,"
"seeks," "should" and "will." Actual results may differ materially from those
expressed or implied in those statements. Factors that could cause these
differences include, but are not limited to, those discussed under "Risk
Factors" and "Management's Discussion and Analysis of Financial Condition and
Results of Operations."



                             ABOUT THIS PROSPECTUS



     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information that is different
from that contained in this prospectus. We are offering to sell, and seeking
offers to buy, shares of common stock only in jurisdictions where offers and
sales are permitted. The information contained in this prospectus is accurate
only as of the date of this prospectus, regardless of the time of delivery of
this prospectus or of any sale of common stock.



     This preliminary prospectus is subject to completion prior to this
offering. Among other things, this preliminary prospectus describes our company
as we currently expect it to exist at the time of this offering.



     Universal Gene Recognition(TM), Universal GeneTools(TM),
ZFP-Diagnostics(TM), ZFP-Therapeutics(TM), ZFP-Transgenics(TM) and ZFP(TM) are
our trademarks. We will apply to register Universal Gene Recognition, Universal
GeneTools, ZFP-Diagnostics, ZFP-Therapeutics, ZFP-Transgenics and ZFP. All
trademarks and trade names appearing elsewhere in this prospectus are the
property of their respective holders.


                                       17
<PAGE>   21

                                USE OF PROCEEDS


     Our net proceeds from the sale of the 5,000,000 shares of common stock we
are offering will be approximately $73.2 million, or $84.4 million if the
underwriters' over-allotment option is exercised in full, based on an assumed
initial offering price of $16.00 per share, after deducting the estimated
underwriting discount and commissions and the estimated offering expenses.


     We currently expect to use the net proceeds of this offering for research
and development, capital equipment and general corporate purposes. We may also
use a portion of the net proceeds to acquire or invest in businesses, products
and technologies that are complementary to our own, although no acquisitions are
planned or being negotiated as of the date of this prospectus, and no portion of
the net proceeds has been allocated for any specific acquisition or for
acquisitions generally. Pending these uses, the net proceeds will be invested in
short term, investment grade, interest-bearing securities.

     The principal purposes of the offering are to increase our capitalization
and financial flexibility, to provide a public market for our common stock and
to facilitate access to public equity markets. While it is not possible to
estimate with certainty how the net proceeds of this offering will be used over
the next three years, we believe that approximately $60 million will be used for
research and development, approximately $10 million for capital equipment and
the balance for general corporate purposes. Since these are only estimates, our
management will have broad discretion in the application of net proceeds.

                                DIVIDEND POLICY

     We have never paid dividends on our common or preferred stock. We currently
intend to retain any future earnings to support the development of our business.
Therefore, we do not currently anticipate paying any cash dividends in the
foreseeable future.

                                       18
<PAGE>   22

                             CAPITALIZATION

     The following table sets forth our capitalization as of December
31, 1999:

     - on an actual basis

     - on a pro forma basis to give effect to:

      - automatic conversion of all outstanding shares of preferred
        stock into 9,711,834 shares of common stock upon consummation of
        the offering;

      - the issuance of 333,333 shares of preferred stock in January
        2000 which converts into 666,666 shares of common stock upon
        consummation of the offering;

      - the issuance of a $5 million note in January 2000 and a $7.5
        million note in March 2000 which convert, together with accrued
        interest, into 789,587 shares of common stock at an assumed
        initial public offering price upon consummation of the offering
        of $16.00.

     - on a pro forma as adjusted basis to give effect to the sale of
       5,000,000 shares of our common stock at an assumed initial public
       offering price of $16.00 per share in this offering, after
       deducting the estimated underwriting discounts and commissions
       and our estimated offering expenses.

     You should read this table with "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and the
Financial Statements and Notes to the Financial Statements appearing
elsewhere in this prospectus.


<TABLE>
<CAPTION>
                                                                   AS OF DECEMBER 31, 1999
                                                              ---------------------------------
                                                                                     PRO FORMA
                                                              ACTUAL    PRO FORMA   AS ADJUSTED
                                                              -------   ---------   -----------
                                                                       (IN THOUSANDS)
<S>                                                           <C>       <C>         <C>
Long-term debt, less current portion........................  $   250    $   250     $    250
                                                              -------    -------     --------
Stockholders' equity:
  Preferred stock, $0.01 par value, 6,000,000 shares
     authorized, actual and pro forma, 5,000,000 shares
     authorized, as adjusted; 4,855,917 shares issued and
     outstanding, actual, no shares issued and outstanding,
     pro forma and pro forma as adjusted....................   15,187         --           --
  Common stock, $0.01 par value, 15,000,000 authorized,
     actual, 80,000,000 shares authorized, pro forma and pro
     forma as adjusted; 6,132,060 shares issued and
     outstanding, actual, 17,300,417 shares issued and
     outstanding, pro forma and 22,300,417 shares issued and
     outstanding, pro forma as adjusted.....................    3,258     32,578      105,778
  Note receivable from stockholder..........................     (125)      (125)        (125)
  Deferred stock compensation...............................   (1,736)    (1,736)      (1,736)
  Accumulated deficit.......................................   (8,785)    (8,918)      (8,918)
  Accumulated other comprehensive income....................       83         83           83
                                                              -------    -------     --------
       Total stockholders' equity...........................    7,882     21,882       95,082
                                                              -------    -------     --------
       Total capitalization.................................  $ 8,132    $22,132     $ 95,332
                                                              =======    =======     ========
</TABLE>


     The number of shares of common stock outstanding excludes:

     - 1,872,666 shares of common stock issuable upon exercise of stock
       options outstanding at a weighted average exercise price of $0.15
       per share;

     - 259,962 shares of common stock issuable upon the exercise of
       outstanding warrants at a weighted average exercise price of
       $2.00 per share; and

     - a total of 2,400,000 shares of common stock available for future
       issuance under our stock option plans.

                                       19
<PAGE>   23

                                    DILUTION


     Our pro forma net tangible book value at December 31, 1999 was $7.1
million, or $0.50 per share, assuming the conversion of our preferred stock into
common stock upon consummation of the offering. Pro forma net tangible book
value per share represents total net tangible assets less liabilities, divided
by pro forma common shares outstanding after giving effect to the conversion of
our preferred stock into common stock upon the consummation of this offering.
Subsequent to December 31, 1999, we issued 333,333 shares of preferred stock for
$1.5 million which converts into 666,666 shares of common stock upon
consummation of this offering, and a $5 million note in January 2000 and a $7.5
million note in March 2000 which convert, together with accrued interest, into
789,587 shares of common stock at an assumed initial offering price of $16.00,
upon consummation of this offering. These subsequent issuances increased our pro
forma net tangible book value per share by $0.76, assuming their conversion into
common stock.



     After giving effect to our sale of shares of common stock in this offering
and after deducting the underwriting discounts and commissions and our estimated
offering expenses, our pro forma net tangible book value as of December 31, 1999
would have been $95.1 million, or $4.26 per share. This represents an immediate
increase in pro forma net tangible book value of $3.00 per share to existing
stockholders and an immediate dilution of $11.74 per share to new investors.
Dilution in pro forma net tangible book value per share represents the
difference between the amount per share paid by purchasers of shares of our
common stock in this offering and the pro forma net tangible book value per
share of our common stock immediately following this offering. The following
table illustrates this per share dilution:



<TABLE>
<S>                                                           <C>       <C>
Initial public offering price per share.....................            $16.00
  Pro forma net tangible book value per share at December
     31, 1999...............................................  $ 0.50
  Increase per share attributable to equity and convertible
     note issuances subsequent to December 31, 1999.........    0.76
  Increase per share attributable to the offering...........    3.00
                                                              ------
Pro forma net tangible book value per share after the
  offering..................................................              4.26
                                                                        ------
Dilution per share to new investors.........................            $11.74
                                                                        ======
</TABLE>


     The following table summarizes, using the same pro forma assumptions as
above and assuming an initial public offering price of $16.00, the differences
between the existing stockholders and new investors with respect to the number
of shares of common stock purchased from us, the total consideration paid to us,
and the average price per share.

<TABLE>
<CAPTION>
                                        SHARES PURCHASED      TOTAL CONSIDERATION
                                      --------------------   ----------------------   AVERAGE PRICE
                                        NUMBER     PERCENT      AMOUNT      PERCENT     PER SHARE
                                      ----------   -------   ------------   -------   -------------
<S>                                   <C>          <C>       <C>            <C>       <C>
Existing stockholders...............  17,300,417      78%    $ 29,478,000      27%     $      1.70
New investors.......................   5,000,000      22       80,000,000      73            16.00
                                      ----------     ---     ------------     ---
  Totals............................  22,300,417     100%    $109,478,000     100%
                                      ==========     ===     ============     ===
</TABLE>

- -------------------------

     This table excludes the following shares as of December 31, 1999:

     - 1,872,666 shares issuable upon exercise of outstanding options at a
       weighted average exercise price of $0.15 per share;

     - 259,962 shares issuable upon exercise of outstanding warrants at a
       weighted average exercise price of $2.00 per share; and

     - a total of 2,400,000 shares available for future issuance under our stock
       plans.

     See "Management -- Stock Plans" and Note 4 of Notes to Financial
Statements.

                                       20
<PAGE>   24

                            SELECTED FINANCIAL DATA

     Our audited financial statements, which have been audited by Ernst & Young
LLP, were used for the following selected statement of operations data for the
period from inception to December 31, 1995 and for the years ended December 31,
1996, 1997, 1998 and 1999, and the balance sheet data as of December 31, 1995,
1996, 1997, 1998 and 1999. The diluted net loss per share computation excludes
potential shares of common stock (preferred stock, options and warrants to
purchase common stock and common stock subject to repurchase rights that we
hold), since their effect would be antidilutive. See Note 1 of Notes to
Financial Statements for a detailed explanation of the determination of the
shares used to compute actual and pro forma basic and diluted net loss per
share. Our historical results are not necessarily indicative of results to be
expected for future periods. You should read the following selected financial
data along with our Financial Statements and related Notes and "Management's
Discussion and Analysis of Financial Condition and Results of Operations"
included elsewhere in this prospectus.

<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31,
                                                 ---------------------------------------------
                                                  1995     1996     1997      1998      1999
                                                 ------   ------   -------   -------   -------
                                                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                              <C>      <C>      <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
Total revenues.................................  $  183   $  632   $ 1,152   $ 2,038   $ 2,182
                                                 ------   ------   -------   -------   -------
Operating expenses:
  Research and development.....................     150      628     1,700     4,259     4,266
  General and administrative...................      50      322       797     1,237     1,822
                                                 ------   ------   -------   -------   -------
     Total operating expenses..................     200      950     2,497     5,496     6,088
                                                 ------   ------   -------   -------   -------
Loss from operations...........................     (17)    (318)   (1,345)   (3,458)   (3,906)
Interest income (expense), net.................      --       10       (55)      173       131
                                                 ------   ------   -------   -------   -------
Net loss.......................................  $  (17)  $ (308)  $(1,400)  $(3,285)  $(3,775)
                                                 ======   ======   =======   =======   =======
Basic and diluted net loss per share...........  $(0.00)  $(0.06)  $ (0.26)  $ (0.56)  $ (0.63)
                                                 ======   ======   =======   =======   =======
Shares used in computing basic and diluted net
  loss per share...............................   5,000    5,143     5,485     5,843     5,991
                                                 ======   ======   =======   =======   =======
Pro forma basic and diluted net loss per share
  (unaudited)..................................                                        $ (0.29)
                                                                                       =======
Shares used in computing pro forma basic and
  diluted net loss per share (unaudited).......                                         13,102
                                                                                       =======
</TABLE>


<TABLE>
<CAPTION>
                                                               AS OF DECEMBER 31,
                                                   ------------------------------------------
                                                   1995   1996     1997      1998      1999
                                                   ----   -----   -------   -------   -------
                                                                 (IN THOUSANDS)
<S>                                                <C>    <C>     <C>       <C>       <C>
BALANCE SHEET DATA:
Cash, cash equivalents and short-term
  investments....................................  $243   $ 358   $ 6,314   $ 3,058   $ 7,503
Working capital..................................   308     434     6,233     3,161     7,206
Total assets.....................................   346     539     6,896     4,032     9,162
Long-term debt...................................    --      --        --       250       250
Accumulated deficit..............................   (17)   (325)   (1,725)   (5,010)   (8,785)
Total stockholders' equity.......................   308     434     6,409     3,404     7,882
</TABLE>


                                       21
<PAGE>   25

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     You should read the following discussion and analysis along with the
"Selected Financial Data" and the financial statements and notes attached to
those statements included elsewhere in this prospectus.

OVERVIEW

     We were incorporated in June 1995. From our inception through December 31,
1999, our activities related primarily to establishing a research and
development organization and developing relationships with our Universal
GeneTools collaborators. We have incurred net losses since inception and expect
to incur losses in the near future as we expand our research and development
activities. To date, we have funded our operations primarily through the
issuance of equity securities, borrowings, and payments from federal government
research grants and from Universal GeneTools collaborators. As of December 31,
1999, we had an accumulated deficit of $8.8 million.

     Our revenues consist primarily of federal government research grant funding
and revenues from our Universal GeneTools collaborators. We expect that in the
near future, our revenues will also include payments from strategic partners for
technology access fees, committed research funding and research milestone
payments.

     In January 2000, we announced that we had entered into a strategic partner
agreement with Edwards LifeScience, Inc., formerly the CardioVascular Group of
Baxter Healthcare Corporation for the development of ZFPs in cardiovascular and
peripheral vascular diseases. Under this agreement, Baxter has purchased a $5
million convertible note which will convert, together with accrued interest,
into common stock upon consummation of this offering, and we have received $1
million in initial research funding from Baxter. In March 2000, Baxter exercised
an option by purchasing a $7.5 million convertible note, which will convert,
together with accrued interest, into common stock upon consummation of this
offering, for a right of first refusal to negotiate a license for additional
ZFP-Therapeutics in cardiovascular and peripheral vascular disease. In the
future, we may receive option fees, milestone payments, royalties and additional
research funding from this agreement. See "Business -- Corporate Collaborations"
and Note 7 of Notes to Financial Statements.

     Research and development expenses consist primarily of salaries and related
personnel expenses, subcontracted research expenses, and technology license
expenses. As of December 31, 1999, all research and development costs have been
expensed as incurred. We believe that continued investment in research and
development is critical to attaining our strategic objectives. We expect these
expenses will increase significantly in the future as we continue to develop our
Universal Gene Recognition technology platform.

     General and administrative expenses consist primarily of salaries and
related personnel expenses for executive, finance and administrative personnel,
professional fees, and other general corporate expenses. As we add personnel and
incur additional costs related to the growth of our business, general and
administrative expenses will also increase.

STOCK COMPENSATION

     During the years ended December 31, 1997, 1998 and 1999, in connection with
the grant of stock options to employees and directors, we recorded deferred
stock compensation totaling $449,000, $780,000 and $1.5 million, respectively,
representing the difference between the fair value of our common stock on the
date such options were granted and the exercise price. These amounts are

                                       22
<PAGE>   26


included as a reduction of stockholders' equity and are being amortized over the
vesting period of the individual options, generally four years, using the graded
vesting method. The graded vesting method provides for vesting of portions of
the overall award at interim dates and results in higher vesting in earlier
years than straight-line vesting. The fair value of our common stock for
purposes of this calculation was determined based on the business factors
underlying the value of our common stock on the date such option grants were
made, viewed in light of this offering and the expected initial public offering
price per share. We recorded amortization of deferred stock compensation of
$46,000, $410,000 and $519,000, for the years ended December 31, 1997, 1998 and
1999, respectively. At December 31, 1999, we had a total of $1.7 million
remaining to be amortized over the vesting periods of the stock options. Through
March 13, 2000 we recorded additional deferred stock compensation of $5.8
million in connection with grants of stock options subsequent to December 31,
1999 and we may record additional deferred stock compensation for options
granted prior to the closing of this offering. You should read Note 4 of Notes
to Financial Statements for more information.


RESULTS OF OPERATIONS

  Years Ended December 31, 1999 and 1998

     Total revenues. Total revenues consist of revenues from collaboration
agreements and federal government research grants. Revenues from our Universal
GeneTools agreements were $1.0 million in 1999, compared with $150,000 during
1998, an increase of $850,000. The increase in 1999 was principally attributable
to revenues recognized from collaboration agreements signed since the third
quarter of 1998. We expect revenues from these agreements to continue to
increase as additional agreements are signed or existing agreements are
expanded. Federal government research grant revenues were $1.2 million in 1999,
compared to $1.9 million in 1998, a decrease of $706,000. The decrease in 1999
was principally due to an increased focus on Universal GeneTools collaborations
and strategic partners in 1999 as some existing federal research government
grants ended. We plan to continue to apply for federal government research
grants.

     Research and development expenses. Research and development expenses were
$4.3 million for 1999 and 1998 as reductions in laboratory supplies and
equipment expenses were offset by increases in stock compensation expense. We
expect research and development expenses to increase significantly in future
periods, particularly as we increase the scientific staff to continue to develop
the Universal Gene Recognition technology and to meet the needs of our Universal
GeneTools collaborators and strategic partners.

     General and administrative expenses.  General and administrative expenses
increased by $585,000, from $1.2 million in 1998 to $1.8 million in 1999. This
increase was primarily attributable to increased staffing to support our
expanded research and development activities and development of our Universal
Gene Recognition technology. We expect that general and administrative expenses
will increase in the future to support continued growth of our research and
development efforts.

     Interest income (expense), net. Interest income (expense), net decreased by
$42,000 from $173,000 in 1998 to $131,000 in 1999. The decrease in interest
income, net resulted from lower average interest-bearing balances and higher
debt balances during 1999.

  Years Ended December 31, 1998 and 1997

     Total revenues. Federal government research grant revenues increased by
$736,000 from $1.2 million in 1997 to $1.9 million in 1998. This increase was
principally attributable to revenue from new federal government research grants,
including a grant from the Department of Commerce under the Advanced Technology
Program initiated in late 1997.

                                       23
<PAGE>   27

     Research and development expenses. Research and development expenses
increased $2.6 million from $1.7 million in 1997 to $4.3 million in 1998. This
increase was primarily attributable to increases in staffing as we added
additional employees to invest in the development of our Universal Gene
Recognition technology platform. In addition, we incurred additional expense
from expanded laboratory facilities in 1998, our first full year in our new
facility in Richmond, California.

     General and administrative expenses. General and administrative expenses
increased by $440,000 from $797,000 in 1997 to $1.2 million in 1998. This
increase reflected increased administrative staffing in support of our expanding
research and development activities.

     Interest income (expense), net. Interest income (expense), net increased by
$228,000 from net interest expense of $55,000 in 1997 to net interest income of
$173,000 in 1998. This increase was due to higher interest-bearing balances as a
result of preferred stock financings in late 1997, as well as the elimination of
interest expense as a result of conversion of a bridge loan into preferred stock
in the 1997 financings.

     We incurred net operating losses in 1997, 1998 and 1999 and consequently we
did not pay any federal, state or foreign income taxes.

LIQUIDITY AND CAPITAL RESOURCES

     Since inception, we have financed our operations primarily through the
private placements of preferred stock, federal government research grants,
payments from Universal GeneTools collaborators and a strategic partner and
financing activities such as a bank line of credit. As of December 31, 1999, we
had cash, cash equivalents and short-term investments totaling $7.5 million.

     Net cash used in operating activities was $2.4 million for 1999, $3.2
million in 1998 and $818,000 in 1997. In all periods, net cash used in operating
activities was primarily due to funding of net operating losses.

     Net cash used in investing activities was $6.0 million in 1999, $2.2
million in 1998 and $124,000 in 1997. Cash was used during these periods to
purchase short-term investments and property and equipment.

     Net cash provided by financing activities during 1999 was $7.5 million as a
result of the private placement of preferred stock. Net cash provided by
financing activities in 1998 was $253,000 primarily representing the proceeds
from a bank note payable used to finance equipment purchases. Net cash provided
by financing activities in 1997 was $6.9 million primarily from proceeds from
the private placement of preferred stock.

     We believe that the net proceeds of this offering, together with available
cash resources, funds received under federal government research grants and from
Universal GeneTools collaborators and a strategic partner are sufficient to
finance our operations for at least two years. To date, we have been awarded
research grants from the National Institute of Standards and Technology and the
National Institutes of Health amounting to approximately $5.6 million, of which
approximately $5.0 million has been used from our inception through December 31,
1999. We may need to raise substantial additional capital to fund subsequent
operations. Funding, however, may not be available on favorable terms, if at
all.

     As of December 31, 1999, we had federal and state net operating loss
carryforwards of approximately $7.9 million to offset future taxable income. We
also had federal research and development tax credit carryforwards of
approximately $100,000. If not used, net operating loss and credit carryforwards
will begin to expire in 2010. Use of the net operating losses and credits may be

                                       24
<PAGE>   28

subject to a substantial annual limitation due to ownership change limitations
provided by the Internal Revenue Code of 1986. The annual limitation may result
in the expiration of our net operating losses and credits before they can be
used. Also, if we do not become profitable, we will not be able to use these net
operating losses and credits.

DISCLOSURE ABOUT MARKET RISK

     Our exposure to market risk for changes in interest rates relates primarily
to our cash equivalents and short-term investments. The short-term investments
are available for sale. We do not use derivative financial instruments in our
investment portfolio. We attempt to ensure the safety and preservation of our
invested funds by limiting default and market risks. Our cash and investments
policy emphasizes liquidity and preservation of principal over other portfolio
considerations. We select investments that maximize interest income to the
extent possible within these guidelines. We satisfy liquidity requirements by
investing excess cash in securities with different maturities to match projected
cash needs and limit concentration of credit risk by diversifying our
investments among a variety of high credit-quality issuers. We mitigate default
risk by investing in only investment-grade securities. The portfolio includes
marketable securities with active secondary or resale markets to ensure
portfolio liquidity. All short-term investments have a fixed interest rate and
are carried at market value, which approximates cost. Our investment portfolio
at December 31, 1999 had an average maturity of 104 days, and therefore we
believe we have insignificant market risk. If market interest rates were to
increase by 1% from December 31, 1999, the fair value of our portfolio would
decline by less than $25,000. The modeling technique used measures the change in
fair values arising from an immediate hypothetical shift in market interest
rates and assumes ending fair values include principal plus accrued interest.

YEAR 2000 ISSUES

     We did not experience any significant problems associated with Year 2000
issues, and we are not aware that any of our vendors or suppliers experienced
any of these problems. We do not believe that any Year 2000 issues are likely to
have a material effect on our business, financial condition or results of
operations.

                                       25
<PAGE>   29

                                    BUSINESS

OVERVIEW


     Sangamo is a leader in the research and development of transcription
factors for the regulation of genes. Our Universal Gene Recognition platform is
a proprietary technology based on engineering a class of transcription factors
referred to as zinc finger DNA binding proteins, or ZFPs. We believe that
Universal Gene Recognition is a fundamentally enabling technology, widely
applicable to pharmaceutical discovery, therapeutics for the treatment of human
diseases, clinical diagnostics and agricultural and industrial biotechnology. We
intend to commercialize our technology broadly over its many applications.


BACKGROUND

     Genes and Gene Expression. Deoxyribonucleic acid, or DNA, is present in all
living cells and is responsible for determining the inherited characteristics of
all living organisms. DNA is arranged on chromosomes in individual units called
genes. Genes encode proteins, which are assembled through the processes of
transcription, whereby DNA is transcribed into ribonucleic acid, or RNA, and
translation, whereby RNA is translated into protein. DNA, RNA, and proteins
represent a large percentage of the targets for pharmaceutical drug discovery.

     The human body is composed of specialized cells that perform different
functions and are thus organized into tissues and organs. All cells in the human
body contain the same set of genes. It is believed, however, that only about 10%
of these genes are turned on, or expressed, in an individual human cell. Genes
are turned on or turned off, or activated or repressed, in response to a wide
variety of stimuli and developmental signals. Different sets of genes are
expressed in distinct types of cells. It is this pattern of gene expression that
determines the structure, biological function and health of all cells, tissues
and organisms. The under- or over-expression of certain genes, can lead to
disease.

     Transcription Factors. Regulation of gene expression is controlled by
proteins that bind to DNA called transcription factors. A transcription factor
regulates gene expression by recognizing and binding to a specific DNA sequence
associated with a particular gene and causing that gene to be activated or
repressed. In virtually all higher organisms, transcription factors consist of
two components: the first is a DNA binding element, or domain, that recognizes a
specific DNA sequence and thereby directs the transcription factor to the proper
chromosomal location; the second is a functional domain that determines whether
the gene is activated or repressed.

     The Genomics Revolution. Genomics refers to the sequencing and functional
analysis of the complete set of genes of diverse organisms throughout the animal
and plant world. Enormous scientific and financial resources are being dedicated
to the sequencing of all human genes, including the Human Genome Project and
other publicly and privately funded genomics initiatives. It is expected that a
preliminary sequence of the human genome will be completed in the year 2000.

     Over the past decade, genomics research has produced a significant quantity
of information on the location, sequence and structure of thousands of genes.
The human genome may contain upwards of 140,000 unique genes. The challenge
facing the pharmaceutical and other life science industries is how to derive
medically and commercially valuable knowledge about the function of these genes
from this large accumulation of new genomic information.

                                       26
<PAGE>   30

     Genome-Based Drug Discovery and Other Applications. The delivery of the
entire human DNA sequence, with its bounty of new genes and potential drug
discovery targets, simultaneously poses a competitive challenge and significant
commercial opportunity to every pharmaceutical company to:

     - accelerate the identification of drug targets from thousands of newly
       discovered genes whose functions are unknown;

     - sort through the hundreds of potential drug targets to confirm those for
       which proprietary drugs may be successfully developed;

     - increase the accuracy and efficiency of the process by which
       pharmaceutical researchers screen large libraries of chemical compounds
       to identify those which have therapeutic activity, known as compound
       screening; and

     - discover new therapeutics that can control disease through the regulation
       of genes.

     The genomics revolution poses a similar set of challenges and opportunities
to agricultural biotechnology researchers, including identification of
agriculturally important genes, the assessment of which genes may be
commercially viable and the development of improved agrochemicals and crops. In
another application of genomics research, bacteria, yeast and plants may be used
for the biological production of industrial chemicals.

     Commercial Opportunities Based on the Regulation of Gene Expression. The
ability to regulate genes has the potential to enable far-reaching applications
in the human healthcare, agricultural and industrial biotechnology sectors,
including:

     - discovery of new genes and analysis of how they function;

     - therapeutic products for the regulation of disease-related genes;

     - manufacture of pharmaceutical products;

     - modifying cells for the selection of new drugs;

     - DNA sequence detection for applications in pharmaceutical research and
       clinical diagnostics;

     - engineering plants to improve their nutritional and growth properties;
       and

     - manufacture of industrial chemicals using biological systems.

     A technology enabling the design of transcription factors to regulate genes
could have significant commercial utility in each of the applications listed
above.

                                       27
<PAGE>   31

SANGAMO'S UNIVERSAL GENE RECOGNITION TECHNOLOGY PLATFORM


     Our Universal Gene Recognition platform is a proprietary technology for the
regulation of gene expression that is enabled by the engineering of a class of
transcription factors called zinc finger DNA binding proteins, or ZFPs. ZFP
transcription factors have two distinct elements, or domains: a DNA recognition
domain that directs the transcription factor to the proper chromosomal location
by recognizing a specific DNA sequence and a functional domain that causes the
gene to be activated or repressed. This two-component structure of our
engineered ZFP transcription factors is modelled on the structure of naturally
occurring transcription factors in virtually all higher organisms.


               THE MODULAR STRUCTURE OF ZFP TRANSCRIPTION FACTORS

                           [MODULAR STRUCTURE OF ZFP]

   [The figure is a "bar-bell" type structure identifying the DNA domain and the
functional domains of the ZFP transcription factor. Also included is a list of
functional domains.]

     Consistent with this two-domain structure, we take a modular approach to
the design of ZFP transcription factors. The recognition domain is composed of
one or more ZFPs. Each ZFP recognizes and binds to a three base pair sequence of
DNA. Multiple ZFPs can be linked together to recognize longer stretches of DNA.
By modifying those portions of a ZFP that interact with DNA, we believe we can
create new ZFPs capable of recognizing DNA sequences in virtually any gene whose
sequence is known.


     The ZFP DNA recognition domain is coupled to a functional domain, which
causes the ZFP transcription factor to control or regulate the gene in a desired
manner. For instance, an activation domain causes a target gene to be activated.
Alternatively, a repression domain causes the gene to be repressed. Similarly, a
detection domain could be used to identify or detect the target DNA sequence in
a diagnostic test. It is also possible to use the ZFP transcription factor in a
way that temporarily activates or represses a gene. This conditional regulation
of a gene allows the effects of gene expression to be controlled in a reversible
fashion.


     In order to regulate a gene, the ZFP transcription factor must be delivered
to a cell. We have licensed gene transfer technology from Targeted Genetics,
Inc. for use with our Universal GeneTools in pharmaceutical discovery. We are
evaluating this and other technologies for the delivery of ZFPs into cells.

     To date, we have generated hundreds of ZFPs and have tested their affinity,
or tightness of binding, to their DNA target, and their specificity, or
preference for their intended DNA target. We have developed software and
standardized methods for the assembly of ZFPs capable of binding to a

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<PAGE>   32

wide spectrum of DNA sequences. We have linked ZFPs to functional domains to
create ZFP transcription factors and have demonstrated the ability of these ZFP
transcription factors to regulate a limited number of commercially important
genes. We have also shown that engineered ZFPs can detect discrete changes in
medically interesting genes.

THE SANGAMO ADVANTAGE

     We believe that the unique features of ZFP transcription factors will
result in important technical advantages, as compared to alternative
technologies. Among the advantages of our ZFP transcription factor-based
approach to gene regulation are:

     - ZFP transcription factors normally and naturally regulate genes in
       virtually all higher organisms;

     - ZFPs can be designed to recognize unique DNA sequences, resulting in the
       ability to distinguish a single gene within the entire genome;

     - ZFP transcription factors can activate or repress genes, enhancing their
       versatility;

     - ZFP transcription factors can be used to regulate gene expression in
       humans, animals, plants, microbes and viruses; and

     - ZFP transcription factors can themselves be activated and repressed,
       allowing conditional and reversible regulation of a gene.

     We believe that the technical advantages of Universal Gene Recognition will
create leverage across multiple applications, products, markets and commercial
partners:

     Pharmaceutical Discovery Research

     - DISCOVERY OF NEW GENES AND TARGETS. ZFP transcription factors can be used
       to change patterns of gene expression in cells, to stimulate clinically
       interesting changes in these cells, and to determine the genes associated
       with these changes.

     - VALIDATION OF GENE TARGETS. ZFP transcription factors can be used to
       target specific genes which is critical to researchers trying to confirm
       the function and validity of gene targets for drug development.

     - ANIMAL MODELS OF HUMAN DISEASES. The reversible expression of ZFP
       transcription factors is a desirable feature in animal models.

     - ASSAY DEVELOPMENT. The regulation of multiple genes may be an effective
       approach to the engineering of proprietary cells for the screening and
       selection of new pharmaceutical products.

     Human Therapeutics

     - HUMAN THERAPEUTICS. ZFP-Therapeutics are transcription factors developed
       as pharmaceutical products to treat a broad spectrum of diseases through
       the regulation of disease-related genes.

     - MANUFACTURING OF PROTEIN PHARMACEUTICALS. We believe ZFP-engineered human
       cell lines can be used for production of commercially relevant protein
       pharmaceuticals.

     DNA Diagnostics

     - SNP DETECTION. The specificity of ZFPs permits the detection of discrete
       changes in DNA, also known as single nucleotide polymorphisms or SNPs. We
       believe SNPs are likely to

                                       29
<PAGE>   33

       become increasingly important in clinical diagnosis to determine an
       individual's susceptibility to disease or probable response to drug
       therapy.

     - AUTOMATION. Unlike conventional DNA detection technologies, ZFPs
       recognize DNA in its natural form, which may permit a proprietary and
       automated approach to the development of DNA diagnostic assays.

     Agricultural and Industrial Biotechnology

     - AGRICULTURAL BIOTECHNOLOGY. ZFP transcription factors can be used to
       regulate genes in plants, potentially leading to applications in the
       identification of plant genes, agrochemical discovery and the development
       of new crops with enhanced nutritional properties.

     - INDUSTRIAL BIOTECHNOLOGY. ZFP transcription factors may be used to
       regulate genes in yeast, other micro-organisms and plants which may
       permit the expanded use of engineered organisms for the manufacture of
       industrial chemicals.

OUR STRATEGY


     Our strategic objective is to be the worldwide leader in the research and
development of ZFP gene regulation technology and to commercialize this
technology broadly. The key elements of our strategy are as follows:


     Develop the Universal Gene Recognition Platform Across Multiple
Applications. Our core competence, the generation of ZFP transcription factors
for the regulation of genes in different organisms, creates leverage across many
commercial applications. We intend to establish ZFP gene regulation as a widely
accepted technology with applications and competitive advantages in each of our
target markets.

     Build the Technical Infrastructure of ZFP Gene Regulation. Our objective is
to establish ZFPs as a widely used technology platform for the regulation of
gene expression and DNA sequence detection. We are currently building an
electronic "ZFP directory," or database that, when given a specific gene or DNA
sequence, is designed to select optimal sites for ZFP binding and the
corresponding ZFPs. Because of the modular nature of our engineered ZFP
transcription factors, these ZFPs can be efficiently combined with a variety of
functional domains, gene expression systems, and methods of delivery to target
cells. We also intend to automate the assembly and testing of engineered ZFP
transcription factors.

     Develop Proprietary Drug Targets and Therapeutics. As we continue to build
our technology platform and expand our revenue base through Universal GeneTools
collaborations and strategic partnerships, we plan to apply ZFP transcription
factors to the identification and validation of drug targets, and to the
generation of proprietary data on new drug targets that can form the basis for
future strategic partnerships as well as internal product development (see
"Universal GeneTools for Pharmaceutical Discovery"). We also intend to develop
ZFP transcription factors as human therapeutics for the direct regulation of
disease-related genes (see "ZFP-Therapeutics").

     Multi-tiered Business Model. We intend to leverage the broad applicability
of ZFP gene regulation into commercial opportunities across multiple product
markets. We are currently selling our proprietary Universal GeneTools on a
non-exclusive basis to collaborators engaged in target validation for
pharmaceutical discovery. We also intend to develop ZFP transcription factors
for therapeutics with pharmaceutical and biotechnology companies on an exclusive
basis in milestone-and royalty-based strategic partnerships. We plan to enter
into several similar strategic partnerships across the pharmaceutical discovery,
therapeutics for the treatment of human diseases, clinical diagnostics, and
agricultural and industrial biotechnology markets. We further intend to capture

                                       30
<PAGE>   34

additional value through our proprietary programs, which we may commercialize
directly or enter into partnerships at a later stage to increase the economic
benefit we retain.

COMMERCIAL APPLICATIONS

     We are pursuing commercial applications of our Universal Gene Recognition
technology in pharmaceutical discovery, therapeutics for the treatment of human
diseases, clinical diagnostics, and agricultural and industrial biotechnology.

                          SANGAMO'S BUSINESS PLATFORM

                       [UNIVERSAL GENE RECOGNITION GRAPH]

   [Graphic showing the four different commercial applications of our Universal
Gene Recognition technology platform.]

Universal GeneTools for Pharmaceutical Discovery

     We are applying Universal GeneTools to assist pharmaceutical researchers in
their efforts to capitalize on the large accumulation of new genetic information
being generated by the genomics revolution. Among the issues that researchers
must address are:

     - identifying disease-related genes;

     - confirming the validity of these genes and their protein products as
       appropriate targets for drug discovery by determining the function and
       suitability of targets for therapeutic intervention;

     - for validated drug targets, screening large collections of chemicals to
       identify chemical leads for drug development; and

     - identifying variations in these gene sequences among patients and
       determining the relationship of these genetic variations with
       susceptibility to disease and probable response to drug therapy.

     We believe that Universal GeneTools can accelerate the pace and quality of
genome-based drug discovery at each of these critical steps.

                                       31
<PAGE>   35

  Universal GeneTools for Validation of Drug Targets

     As the number of genes identified as potential drug targets increases, the
need to rapidly and efficiently confirm their role in disease increases as well.
ZFP transcription factors are designed to regulate the expression of genes in
cells and animals to determine their role in a particular disease. We and our
Universal GeneTools collaborators have demonstrated the use of ZFP transcription
factors in gene regulation in several cell models of gene expression and our
collaborators are applying the technology to target validation in animal models
of human disease.

     The use of ZFP transcription factors addresses a number of technical
challenges associated with target validation studies in transgenic animals.
Typically, transgenic animals are genetically engineered mice in which a target
gene has been inactivated, or knocked out. Generating a knockout mouse is labor
intensive and can take up to one year. We believe the generation time for mice
which have been engineered with ZFP transcription factors, or ZFP-Transgenic
mice, may be much faster than the generation time for standard knockouts. In
addition, researchers should gain more information from ZFP-Transgenics because
ZFP transcription factors can themselves be regulated thus permitting the
regulation of a target gene in a reversible fashion. This conditional control of
genes in ZFP transcription factors should be a distinct advantage for the
functional study of genes required in normal development. Typically, if an
essential gene is knocked out, the knockout mouse will not grow to maturity.
With ZFP gene regulation, however, we believe researchers can regulate essential
genes at virtually any point in the animal's development. This enables the study
of a gene's function in mature animals without altering the animal's normal
development. We are working closely with some of our Universal GeneTools
collaborators on ZFP-Transgenic models.


     To date, we have entered into Universal GeneTools agreements with 18
leading pharmaceutical and biotechnology companies or their subsidiaries. These
collaborators are applying our ZFP transcription factors to the validation of
human gene targets for drug discovery. ZFP transcription factors are being
incorporated into both cells and animals for this purpose. We are working with
many of these companies to lay the basis for additional and expanded
collaborations and increased market acceptance of our Universal GeneTools. See
"Corporate Collaborations -- Universal GeneTools Collaborations."


  ZFP-Engineered Cells for Identification of Drug Candidates

     We plan to incorporate ZFP transcription factors into appropriate cell
lines for the purpose of screening chemical compounds for drug discovery. In
particular, we plan to engineer cell lines that permit the regulation of
validated gene targets. Activating a gene may allow pharmaceutical researchers
to increase the sensitivity, or responsiveness, to a given concentration of test
compound in an assay. In addition, if a response is observed when the gene is
both activated or repressed, it can be concluded that the test compound is not
acting through the protein encoded by that gene and may be showing a false
positive result.

     We intend to commercialize ZFP-engineered cell lines for identification of
drug product candidates by developing relationships with strategic partners in
our Universal GeneTools business. Cell lines will be engineered and optimized by
Sangamo scientists and transferred to our partners for use in their drug
screening operations.

  ZFP Libraries for Target Discovery

     Pharmaceutical researchers are also interested in accelerating an important
step in the first stages of genome-based drug discovery: the initial
identification of new drug targets.

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<PAGE>   36

     ZFP transcription factors can be used to change patterns of gene expression
in cells, to stimulate clinically interesting changes in these cells, and to
determine the genes associated with these changes. ZFP libraries are large
collections of ZFP transcription factors that can be incorporated into
populations of cells such that each cell receives one ZFP transcription factor.
In any given cell, the ZFP transcription factor may change the function or
health of the cell, causing it to change in appearance. The ZFP transcription
factor that triggers this change can be purified, and its gene target
identified. In this manner, these genes could be identified as potential targets
for further study, validation, and drug screening.

     We intend to commercialize our ZFP libraries by establishing strategic
partnerships. We anticipate that ZFP libraries will be optimized by Sangamo
scientists and used to identify targets in our partners' drug discovery
programs. We also plan to use ZFP libraries to discover novel gene targets in
our future, proprietary product development programs.

ZFP-Therapeutics

     The promise of genome-based drug discovery includes the increasing supply
of new drug targets. ZFP transcription factors may offer a highly specific
approach to regulation of disease-related genes. We are developing ZFP
transcription factors for the treatment of human diseases, or ZFP-Therapeutics,
for cardiovascular, viral, and ophthalmic diseases and cancer.

  Cardiovascular Disease

     Cardiovascular disease is the leading cause of death in the United States
with nearly one million deaths annually. Approximately 400,000 Americans undergo
angioplasty, or opening, of coronary blood vessels each year due to
cardiovascular disease. Approximately 35% of these patients suffer from
restenosis, or partial reclosing of treated blood vessels, and require a second
procedure or more invasive surgery such as coronary bypass.

     There is increasing interest in the development of therapeutic approaches
to cardiovascular disease that might stimulate the human body's natural ability
to form new blood vessels. This natural process is called angiogenesis. In
partnership with Edwards LifeScience, Inc., formerly the Cardiovascular Group of
Baxter Healthcare Corporation, or Baxter, we are developing ZFP transcription
factors designed to activate the expression of vascular endothelial growth
factors, or VEGFs.

     ZFP transcription factors for therapeutic angiogenesis may also be used in
peripheral vascular diseases. We believe an advantage of the ZFP-Therapeutic
approach is the potential ability to activate multiple genes as necessary to
provide effective biological stimulation of angiogenesis. Our experiments on
VEGF activation are ongoing.

  Hepatitis B Viral Disease

     Hepatitis B Virus, or HBV, is a worldwide health problem and is endemic in
many regions of Asia and Africa. Although HBV infection can generally be
prevented by vaccination, HBV remains a major clinical problem. It is estimated
that there are more than 350 million chronic HBV carriers worldwide. The
consequences of HBV infection include chronic active hepatitis and liver
cirrhosis, the latter of which is a major cause of mortality. The risk of liver
cancer in HBV carriers is estimated to be 100 times greater than in uninfected
individuals.

     In 1998, we initiated a research collaboration with Dr. Alan McLachlan of
The Scripps Research Institute. The purpose of the collaboration is to evaluate
our ZFP transcription factors designed to

                                       33
<PAGE>   37

repress the expression of HBV genes and viral replication in liver cells. Dr.
McLachlan is an expert in the regulation of HBV gene expression and has
developed several biological assays for the measurement of HBV gene expression
and viral replication. Preliminary data suggest that our ZFP transcription
factors can repress the expression of HBV genes in liver cells. We are
continuing these studies to confirm and extend these results.

  HIV Disease

     HIV is the causative agent of AIDS, a disease that killed approximately
17,000 patients in the United States in 1998. Despite advances in pharmaceutical
therapy, there are currently approximately 400,000 HIV-infected individuals in
the United States and over 30 million people carrying the virus worldwide. The
new combination therapies, known as cocktail therapies, have been demonstrated
to be effective in clinical trials; however, the complexity of these regimens
often results in poor patient compliance and reduced efficacy.

     In collaboration with Dr. Leonid Stamatatos of the Aaron Diamond AIDS
Research Center, we are testing our ZFP transcription factors designed to
repress HIV gene expression in human cells. These transcription factors could
provide the basis for the inhibition of HIV proliferation in patients infected
with HIV. Preliminary data suggest these ZFP transcription factors can repress
HIV gene expression in cells. Further experiments are ongoing.

     In collaboration with Dr. Jeremy Berg of the Johns Hopkins University
School of Medicine, we are also testing ZFP transcription factors designed to
repress the expression of the human CCR5 gene, which encodes a protein used by
HIV to gain entry into cells of the immune system. Repression of CCR5 expression
in immune system cells may prevent HIV infection of these cells. Preliminary
data suggest that our ZFP transcription factors can repress CCR5 gene expression
in cells. Further experiments are ongoing.

  Repression of Angiogenesis for Diabetic Retinopathy and Cancer

     In contrast to cardiovascular disease, there are diseases that might
benefit from the inhibition of angiogenesis. Diabetic retinopathy, the leading
cause of blindness among diabetics, is the result of uncontrolled
vascularization of the retina and appears to be due to the secretion of
angiogenic factors such as VEGF. We believe that ZFP transcription factors
designed to repress the expression of VEGF and other angiogenic factors may
reverse this process.

     Solid tumors require the ingrowth of new blood vessels if they are to grow
beyond even a few millimeters in diameter. Tumor cells frequently signal for
additional blood supply by secreting VEGF. Repression of VEGF expression in
tumor cells with ZFP-Therapeutics may prevent this angiogenesis and slow or halt
solid tumor growth.

     We have designed multiple ZFP transcription factors designed to repress the
expression of the VEGF gene. These ZFP transcription factors have shown
repression of VEGF expression in cultured human cells. We intend to test this
same approach in animal models of angiogenesis and cancer and, if successful, to
enter into human clinical trials with a future strategic partner.

  Commercialization of ZFP-Therapeutics

     We plan to develop and commercialize ZFP-Therapeutics in partnership with
pharmaceutical and biotechnology companies. We intend to negotiate partnerships
with terms that will provide partners with exclusive rights to the regulation of
specific genes, delineating in exact terms the

                                       34
<PAGE>   38

clinical indications and geographic areas covered under the agreement. We intend
to commence additional therapeutic programs and may retain commercial rights to
some of these products.

  ZFP-Engineered Cell Lines for the Production of Protein Pharmaceuticals

     Protein pharmaceuticals manufactured with genetically modified cells now
account for more than $10 billion in annual worldwide sales. By using ZFP
transcription factors to activate the expression of genes encoding therapeutic
proteins in human cells, we are able to genetically engineer cells for
production of protein pharmaceuticals. We plan to develop ZFP-engineered cell
lines for production of commercially relevant proteins in partnership with
pharmaceutical and biotechnology companies.

ZFPs for Pharmacogenomics and Clinical Diagnostics

     Single nucleotide polymorphisms, or SNPs, are DNA sequence variations at
specific chromosomal sites. SNPs have been the subject of increasing research in
recent years. It is now believed that some SNPs may be strongly associated with
some disease states, providing indicators of disease susceptibility and how
individual patients might respond to a particular drug therapy. The
pharmaceutical industry is investing in technology to monitor and record patient
SNPs in clinical trials and to correlate clinical outcomes with SNP status.

     We have shown that ZFPs can effectively detect small variations in DNA
sequences and therefore may be used to detect SNPs in clinical samples. In
addition, ZFPs bind to DNA in its natural form, permitting simplified
preparation of DNA for analysis. Further, ZFPs are stable proteins and therefore
amenable to the types of assays and instrumentation used in standard clinical
and molecular biology laboratories. Combined with sensitive detection
technologies, ZFPs have the potential to eliminate the extensive manipulation of
patient DNA samples, reducing the time and cost, and increasing the accuracy of
diagnostic assays.

     We intend to commercialize ZFPs for SNP detection and DNA diagnostics in
conjunction with partners engaged in the development of SNP diagnostic
technology or the manufacturing and marketing of clinical diagnostics.

ZFP Transcription Factors for Agricultural and Industrial Biotechnology

  Agricultural Biotechnology

     The multibillion-dollar agrochemical industry is undergoing a transition to
genome-based product discovery that is parallel to that of the worldwide
pharmaceutical industry. In a relatively recent development, the genomics
revolution has been applied to the sequencing of plant genes from some of the
world's largest commercial crops. We believe that the genomes of most
commercially important plants will be sequenced over the next several years.
Similar to trends in pharmaceutical research, discovery of thousands of plant
genes is creating enormous demand for technologies that can help ascertain gene
function, identify important gene and agrochemical targets and regulate those
genes through improved transgenic plants.

     ZFP transcription factors are a central mode of gene regulation in plants.
The ability to identify and subsequently regulate the expression of genes with
ZFP transcription factors could lead to the creation of new plants that may
increase crop yields, lower production costs, resist herbicides, pesticides and
plant pathogens, and permit the development of branded agricultural products
with unique nutritional and processing characteristics. In addition, ZFP
transcription factors may be used to confirm the role of newly discovered genes
in plant growth, metabolism and resistance to pathogens.

                                       35
<PAGE>   39

     Modification of fatty acid composition in soybean seed oil is an example of
this approach. Americans annually consume approximately 7.0 million metric tons
of soybean seed oil. This oil is low in monounsaturated fatty acids as compared
with the oil extracted from other seeds, and has reduced value because it must
be chemically modified for some applications. Therefore, a genetically modified
strain of soybean that yielded a higher mix of monounsaturated fatty acids in
its seed oil would be highly desirable. FAD2-1 is a soybean gene that encodes an
enzyme responsible for lowering the levels of monounsaturated fatty acids. We
have generated ZFP transcription factors designed to recognize the FAD2-1 gene
and repress its expression in soybean seed. We have initiated studies of FAD2-1
repression in soybeans.

     To commercialize ZFP transcription factors in agricultural biotechnology,
we intend to seek strategic relationships with corporate partners having
capabilities in the research, development and commercialization of agricultural
products.

  Industrial Biotechnology

     The U.S. chemical industry is undertaking a major strategic initiative to
develop bacterial, fungal and plant biological systems for the production of
industrial chemicals. This initiative is motivated by considerations of product
performance, capital costs, environmental impact and dependence on fossil fuels,
which provide the raw material for the production of many chemical feedstocks in
the United States and around the world.

     A principal challenge in harnessing biological systems for this purpose is
engineering bacterial and fungal cells and plants to achieve predictable and
specific regulation of multiple genes. We believe ZFP transcription factors are
well suited to this task because of their natural ability to discriminate among
closely related genes and their ability to regulate gene expression in a
reversible fashion.

     We believe that ZFP transcription factors will prove to be a commercially
feasible approach for the engineering of cells and plants for the biological
production of industrial chemicals and food additives. We intend to seek
strategic relationships with corporate partners in the chemical and food
processing industries to develop and commercialize applications of Universal
Gene Recognition in industrial biotechnology.

CORPORATE COLLABORATIONS

     We intend to apply the ZFP technology platform in several commercial
applications where the products provide our strategic partners and collaborators
with technical and economic advantages. We have established and will continue to
pursue Universal GeneTools collaborations and strategic partnerships with
selected pharmaceutical and biotechnology companies to fund internal research
and development activities and to assist in product commercialization.

Baxter CardioVascular Group Strategic Partnership

     In January 2000, we announced the initiation of a multiyear, therapeutic
product development collaboration with Edwards LifeScience, Inc., formerly the
CardioVascular Group of Baxter Healthcare Corporation. Under the agreement, we
have licensed to Baxter on a worldwide, exclusive basis our ZFP-Therapeutics for
the activation of VEGFs and VEGF receptors in cardiovascular and peripheral
vascular diseases. In addition, Baxter has purchased a $5 million convertible
note which will convert, together with accrued interest, into common stock upon
consummation of this offering, and we have received $1 million in initial
research funding from Baxter. We will be responsible for advancing product
candidates into preclinical animal testing. Baxter will be responsible for
preclinical

                                       36
<PAGE>   40

development, regulatory affairs, clinical development and the sales and
marketing of the ZFP-Therapeutic products. In March 2000, Baxter exercised an
option by purchasing a $7.5 million convertible note which will convert into
common stock, together with accrued interest, upon consummation of this offering
for a right of first refusal for three years to negotiate a license for
additional ZFP-Therapeutics in cardiovascular and peripheral vascular diseases.
In the future, we may receive option fees, milestone payments, royalties and
additional research funding from this agreement. Baxter has the right to
terminate the agreement at any time upon 90 days written notice. In the event of
termination, we retain all payments previously received.

Universal GeneTools Collaborations


     We began marketing our Universal GeneTools products to the pharmaceutical
and biotechnology industry in 1998. Our Universal GeneTools business is based
upon the delivery of an engineered ZFP transcription factor which is capable of
regulating the expression of a gene for which it is specifically designed and
targeted.



     Our Universal GeneTools agreements generally contain the following terms:



     - Collaborators provide us with the gene target they wish to study and we
       design and deliver at least two ZFP transcription factors designed
       specifically for that collaborator's gene target;



     - Collaborators retain all their rights in confidential gene targets and
       any data they generate with our ZFP transcription factors;



     - Collaborators must provide us with the DNA sequence for the genes they
       wish to regulate;



     - In most agreements, we retain the rights to make, use, develop and sell
       any product or service utilizing the ZFP transcription factors we provide
       to our collaborators. In the other agreements, however, our rights are
       limited, but we do not regard these limitations as material to our
       business;



     - Many of our agreements provide that collaborators make a partial payment
       for ZFP transcription factors during the design stage, and complete their
       payment after receipt of the ZFP transcription factors. The agreements do
       not provide for milestone or royalty payments;


     For fiscal year 1999, we recognized $1.0 million in revenues from these
Universal GeneTools agreements.


     To date, we have not licensed any intellectual property rights to our
current Universal GeneTools collaborators that we believe are material to our
business. Our Universal GeneTools collaborators are under no obligation to
pursue product development programs with us, to use our technology, or to
purchase any additional product from us. See "Risk Factors -- Commercialization
of our technologies depends on strategic partnering with other companies, and if
we are not able to find strategic partners in the future, we may not be able to
develop our technologies or products which could slow our growth and decrease
our revenues."



     We have entered into Universal GeneTools collaborations with 18 leading
pharmaceutical or biotechnology companies or their subsidiaries.



RESEARCH GRANTS


     We have received awards and government grants during the past several years
that have totaled approximately $5.6 million. These grants have provided
non-dilutive research funding to develop our technology platform for specific
applications, primarily in the areas of diagnostics and anti-viral therapeutics.

                                       37
<PAGE>   41

                    SUMMARY OF MAJOR U.S. GOVERNMENT GRANTS

<TABLE>
<S>               <C>                    <C>                                         <C>               <C>
- ---------------------------------------------------------------------------------------------------------------------
 AREA OF GRANT    GRANTING AGENCY        DESCRIPTION                                 GRANT DATE        DOLLAR AMOUNT
- ---------------------------------------------------------------------------------------------------------------------
 DNA Diagnostics  National Institute of  Generation and development of novel         August 1995         $2,000,000
                   Standards and         nucleic acid binding proteins and their     (completed)
                   Technology             use as DNA diagnostics
- ---------------------------------------------------------------------------------------------------------------------
 Antiviral        National Institute of  Development of novel DNA binding proteins   May 1997            $2,000,000
 Therapeutics      Standards and         as antiviral therapeutics targeting HIV
                   Technology             and Hepatitis B
- ---------------------------------------------------------------------------------------------------------------------
 HIV              National Institutes    Designer DNA binding proteins targeting     May 1998            $ 533,000
                  of Health              HIV genes
- ---------------------------------------------------------------------------------------------------------------------
 Agriculture      U.S. Department of     Demonstrating commercial potential of ZFPs  September 1999      $ 220,000
                   Agriculture            for generating value added crops
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>

INTELLECTUAL PROPERTY AND TECHNOLOGY LICENSES

     Our success and ability to compete is dependent in part on the protection
of our proprietary technology and information. We rely on a combination of
patent, copyright, trademark and trade secret laws, as well as confidentiality
agreements and licensing agreements, to establish and protect our proprietary
rights. We have licensed intellectual property covering the design, composition
and use of ZFPs and ZFP transcription factors for the recognition and regulation
of genes. To date, Sangamo has licensed rights to three issued U.S. patents and
five U.S. and four Patent Cooperation Treaty, or P.C.T., patent applications
covering the design, generation and use of ZFPs. We have also licensed five
issued U.S. patents covering the linking of DNA recognition domains to
additional functional domains that provide various DNA-related functions such as
detection and inactivation. We have also filed 11 U.S. and two P.C.T. patent
applications covering improvements in the design and use of ZFPs and ZFP
transcription factors. We plan to continue to license and to generate internally
intellectual property covering the design, selection, generation and composition
of ZFPs, the genes encoding these proteins and the application of ZFPs and ZFP
transcription factors in pharmaceutical discovery, therapeutics for the
treatment of human diseases, clinical diagnostics, and agricultural and
industrial biotechnology applications.

     Although we have filed for patents on some aspects of our technology, we
cannot assure you that patents will issue as a result of these pending
applications or that any patent that has or may be issued will be upheld.
Despite our efforts to protect our proprietary rights, existing patent,
copyright, trademark and trade secret laws afford only limited protection, and
we cannot assure you that our intellectual property rights, if challenged, will
be upheld as valid or will be adequate to protect our proprietary technology and
information. In addition, the laws of some foreign countries may not protect our
proprietary rights to the same extent as do the laws of the United States.
Attempts may be made to copy or reverse engineer aspects of our technology or to
obtain and use information that we regard as proprietary. Our patent filings may
be subject to interferences. Litigation or opposition proceedings may be
necessary in the future to enforce or uphold our intellectual property rights,
to determine the scope of our licenses, or determine the validity and scope of
the proprietary rights of others. The defense and prosecution of intellectual
property suits, United States Patent and Trademark Office interference
proceedings and related legal and administrative proceedings in the United
States and internationally involve complex legal and factual questions. As a
result, these proceedings are costly and time-consuming to pursue, and result in
diversion of resources. The outcome of these proceedings is uncertain and could
significantly harm our business.

     We have received unsolicited invitations to license existing patented
technology from a number of third parties, at least one of which contained an
allegation of infringement. No litigation is being threatened and no license
fees are being proposed. Upon careful analysis of each of these

                                       38
<PAGE>   42

technologies, we have determined that we already own rights to these
technologies or that our scientific and commercial interests would not benefit
from the acquisition of rights to these technologies. Further, we believe that
the making, using or selling of our products and processes need not infringe any
claims in the proffered patents. Accordingly, we have declined to enter into
license negotiations with these parties. We cannot assure you, however, that
these parties will not bring future actions against us, our collaborators or
strategic partners alleging infringement of their patents. As detailed above,
the outcome of any litigation, particularly lawsuits involving biotechnology
patents, is difficult to predict and likely to be costly regardless of the
outcome. In these circumstances, litigation, the risks of a negative impact on
our business can neither be clearly defined nor entirely eliminated.

     In the future, however, third parties may assert patent, copyright,
trademark and other intellectual property rights to technologies that are
important to our business. Any claims asserting that our products infringe or
may infringe proprietary rights of third parties, if determined adversely to us,
could significantly harm our business. Any claims, with or without merit, could
result in costly litigation, divert the efforts of our technical and management
personnel or require us to enter into or modify existing royalty or licensing
agreements, any of which could significantly harm our business. Royalty or
licensing agreements, if required, may not be available on terms acceptable to
us, if at all. See "Risk Factors -- Because it is difficult and costly to
protect our proprietary rights, and third parties have filed patent applications
that are similar to ours, we cannot ensure the proprietary protection of our
technologies and products."

COMPETITION

     We believe that we are a leader in the field of ZFP gene regulation. We are
aware that there are many companies focused on other methods for regulating gene
expression and a limited number of commercial and academic groups pursuing the
development of ZFP gene regulation technology. The field of regulation of gene
expression is highly competitive, and we expect competition to persist and
intensify in the future from a number of different sources, including
pharmaceutical and biotechnology companies, academic and research institutions,
and government agencies that will seek to develop technologies that will compete
with our Universal Gene Recognition technology platform.

     Any products that we develop using our Universal Gene Recognition
technology will participate in highly competitive markets. Many of our potential
competitors in these markets, either alone or with their collaborative partners,
may have substantially greater financial, technical and personnel resources than
we do, and they may succeed in developing technologies and products that would
render our technology obsolete or noncompetitive. In addition, many of those
competitors have significantly greater experience than we do in their respective
fields.

     Accordingly, our competitors may succeed in obtaining patent protection,
receiving FDA approval or commercializing ZFP transcription factors or other
competitive products before us. If we commence commercial product sales, we will
be competing against companies with greater marketing and manufacturing
capabilities, areas in which we have limited or no experience. In addition, any
product candidate that we successfully develop may compete with existing
products that have long histories of safe and effective use.

     Competition may also arise from other drug development technologies and
methods of preventing or reducing the incidence of disease, small molecule
therapeutics, or other classes of therapeutic agents.

     We expect to face intense competition from other companies for
collaborative arrangements with pharmaceutical, biotechnology, agricultural and
chemical companies, for establishing relationships

                                       39
<PAGE>   43

with academic and research institutions, and for licenses to proprietary
technology. These competitors, either alone or with their collaborative
partners, may succeed in developing technologies or products that are more
effective or less costly than ours.

     Our ability to compete successfully will depend, in part, on our ability
to:

     - develop proprietary products;

     - develop and maintain products that reach the market first, are
       technologically superior to or are of lower cost than other products in
       the market;

     - attract and retain scientific and product development personnel;

     - obtain and enforce patents, licenses or other proprietary protection for
       our products and technologies;

     - obtain required regulatory approvals; and

     - manufacture, market and sell any product that we develop.

GOVERNMENT REGULATION

     We have not applied for any regulatory approvals with respect to any of our
technology or products under development. We anticipate that the production and
distribution of any therapeutic or diagnostic products developed, either alone
or with our strategic partners or collaborators, will be subject to extensive
regulation in the United States and other countries. We intend to pursue
therapeutic, diagnostic, agricultural and industrial biotechnology products,
some of which may be subject to different government regulation.

     Before marketing in the United States, any pharmaceutical, therapeutic or
diagnostic products developed by us must undergo rigorous preclinical testing
and clinical trials and an extensive regulatory clearance process implemented by
the FDA under the federal Food, Drug and Cosmetic Act. The FDA regulates, among
other things, the development, testing, manufacture, safety, efficacy, record
keeping, labeling, storage, approval, advertising, promotion, sale and
distribution of biopharmaceutical products. The regulatory review and approval
process, which includes preclinical testing and clinical trials of each product
candidate, is lengthy, expensive and uncertain. Securing FDA approval requires
the submission of extensive preclinical and clinical data and supporting
information to the FDA for each indication to establish a product candidate's
safety and efficacy. The approval process takes many years, requires the
expenditure of substantial resources, involves post-marketing surveillance, and
may involve ongoing requirements for post-marketing studies. Before commencing
clinical investigations in humans, we must submit to, and receive approval from,
the FDA of an Investigational New Drug application. We expect to rely on some of
our strategic partners to file Investigational New Drug applications and
generally direct the regulatory approval process for some products developed
using our Universal Gene Recognition technology.

     Clinical testing must meet requirements for:

     - institutional review board oversight;

     - informed consent;

     - good clinical practices; and

     - FDA oversight.


     Before receiving FDA clearance to market a product, we must demonstrate
that the product is safe and effective on the patient population that will be
treated. If regulatory clearance of a product is granted, this clearance is
limited to those specific states and conditions for which the product is useful,
as demonstrated through clinical studies. Marketing or promoting a drug for an
unapproved


                                       40
<PAGE>   44

indication is generally prohibited. Furthermore, clearance may entail ongoing
requirements for post-marketing studies. Even if this regulatory clearance is
obtained, a marketed product, its manufacturer and its manufacturing facilities
are subject to continual review and periodic inspections by the FDA. Discovery
of previously unknown problems with a product, manufacturer or facility may
result in restrictions on this product or manufacturer, including costly recalls
or withdrawal of the product from the market.

     The length of time necessary to complete clinical trials varies
significantly and may be difficult to predict. Clinical results are frequently
susceptible to varying interpretations that may delay, limit or prevent
regulatory approvals. Additional factors that can cause delay or termination of
our clinical trials, or the costs of these trials to increase, include:

     - slow patient enrollment due to the nature of the protocol, the proximity
       of patients to clinical sites, the eligibility criteria for the study or
       other factors;

     - inadequately trained or insufficient personnel at the study site to
       assist in overseeing and monitoring clinical trials;

     - delays in approvals from a study site's review board;

     - longer treatment time required to demonstrate effectiveness or determine
       the appropriate product dose;

     - lack of sufficient supplies of the product candidate;

     - adverse medical events or side effects in treated patients; and

     - lack of effectiveness of the product candidate being tested.

     In addition, the field testing, production and marketing of genetically
engineered plants and plant products are subject to federal, state, local and
foreign governmental regulation. Regulatory action or private litigation could
also result in expenses, delays or other impediments to our product development
programs or the commercialization of resulting products.

     The FDA currently applies the same regulatory standards to foods developed
through genetic engineering as applied to foods developed through traditional
plant breeding. Genetically engineered food products, however, will be subject
to premarket review if these products raise safety questions or are deemed to be
food additives. Our products or those of our strategic partners may be subject
to lengthy FDA reviews and unfavorable FDA determinations.

     International Biosafety Protocols were recently announced in which
signatory states may require that genetically engineered food products be
labeled as such. Additional and more restrictive international or foreign
policies may be developed which further limit our ability to pursue our business
plan in relation to agricultural biotechnology.


     Outside the United States, our ability to market a product is contingent
upon receiving a marketing authorization from the appropriate regulatory
authorities. The requirements governing the conduct of clinical trials,
marketing authorization, pricing and reimbursement vary widely from country to
country. At present, foreign marketing authorizations are applied for at a
national level, although within the European Community registration procedures
are available to companies wishing to market a product in more than one EC
member state. If the regulatory authority is presented with adequate evidence of
safety, quality and efficacy they will grant a marketing authorization. This
foreign regulatory approval process involves all of the risks associated with
FDA clearance discussed above.


     We intend to consult with, and when appropriate, to hire personnel with
expertise in regulatory affairs to assist us in obtaining appropriate regulatory
approvals as required. We also intend to work

                                       41
<PAGE>   45

with our strategic partners and collaborators that have experience in regulatory
affairs to assist us in obtaining regulatory approvals for collaborative
products. See "Risk Factors -- Our potential therapeutic products are subject to
a lengthy and uncertain regulatory process, and if these potential products are
not approved, we will not be able to commercialize those products" and
"-- Regulatory approval, if granted, may be limited to specific uses or
geographic areas which could limit our ability to generate revenues."

EMPLOYEES

     As of March 14, 2000, we had 45 full-time employees, 14 of whom hold Ph.D.
degrees and 35 of whom hold other graduate or technical degrees. Of our total
workforce, 38 are engaged in research and development activities and seven are
engaged in business development, finance and administration. None of our
employees is represented by a collective bargaining agreement, nor have we
experienced work stoppages. We believe that our relations with our employees are
good.

FACILITIES

     We lease approximately 15,000 square feet of research and office space
located at 501 Canal Boulevard in Richmond, California under two separate
leases. The leases expire in 2004. We believe that the facilities we currently
lease are sufficient for approximately the next 24 months.

LEGAL PROCEEDINGS

     We are not a party to any material litigation.

                                       42
<PAGE>   46

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

     The following table sets forth information regarding our executive
officers, directors and key employees as of March 14, 2000:

<TABLE>
<CAPTION>
                 NAME                   AGE                       POSITION
                 ----                   ---                       --------
<S>                                     <C>    <C>
Edward O. Lanphier II.................  43     President, Chief Executive Officer and Director
Alan P. Wolffe, Ph.D. ................  40     Senior Vice President and Chief Scientific
                                               Officer
Casey C. Case, Ph.D. .................  44     Vice President, Research
Peter Bluford.........................  45     Vice President, Corporate Development
Shawn K. Johnson......................  32     Director of Finance
Eric T. Rhodes........................  39     Director of Commercial Development
S. Kaye Spratt, Ph.D. ................  47     Director of Delivery Technology
Herbert W. Boyer, Ph.D. ..............  63     Director
William G. Gerber, M.D. ..............  53     Director
John W. Larson........................  64     Director
William J. Rutter, Ph.D. .............  71     Director
Michael C. Wood.......................  47     Director
</TABLE>

     Edward O. Lanphier II, the founder of Sangamo BioSciences, Inc., has served
as President, Chief Executive Officer and as a member of the board of directors
since inception. Mr. Lanphier has eighteen years of experience in the
pharmaceutical and biotechnology industry. From June 1992 to May 1997, he held
various positions at Somatix Therapy Corporation, a gene therapy company,
including Executive Vice President, Commercial Development and Chief Financial
Officer. Prior to Somatix, Mr. Lanphier was President and Chief Executive
Officer of BioGrowth, Inc., a biotechnology company that merged with Celtrix
Laboratories to form Celtrix Pharmaceuticals, Inc. in 1991. From 1986 to 1987,
Mr. Lanphier served as Vice President of Corporate Development at
Biotherapeutics, Inc. From 1984 to 1986 he served as Vice President of Corporate
Development at Synergen Inc. Prior to Synergen, he was employed by Eli Lilly and
Company, a pharmaceutical company, in the strategic business
planning-biotechnology group. Mr. Lanphier is a member of the Biotechnology
Industry Organization (BIO) Emerging Companies Section and the BIO board of
directors. Mr. Lanphier has a B.A. in biochemistry from Knox College.

     Alan P. Wolffe, Ph.D. joined Sangamo as its Senior Vice President and Chief
Scientific Officer in March 2000. Dr. Wolffe is internationally recognized for
his research on chromatin structure and its role in the regulation of gene
expression, with over 250 research publications on this topic. He was Director
of the Department of Molecular Embryology at the National Institutes of Child
Health and Human Development from 1990 until March 2000. During this time, Dr.
Wolffe's laboratory discovered the determinants of chromosonal gene regulation
by ZFPs, including observations that have proven fundamental to the
understanding of histone acetylation and deacetylation in transcriptional
control. Dr. Wolffe has received numerous prizes for his research and serves as
an editor on the editorial boards of Biochemistry, Journal of Cell Science,
Molecular Biology of the Cell, Molecular Cell Biology, Nucleic Acids Research,
and Science. Dr. Wolffe received a Ph.D. in molecular biology from the Medical
Research Council and a B.A. in biochemistry from Oxford University.

     Casey C. Case, Ph.D. has served as Vice President, Research since November
1997. From June 1993 to November 1997, Dr. Case served as Director, Cell Biology
at Tularik, Inc., a pharmaceutical company focusing on gene regulating drugs,
where he was part of the team that established Tularik's
                                       43
<PAGE>   47

cell-based, high throughput screening of small molecule modulators of specific
transcription factors. From June 1989 to June 1993, Dr. Case was Director of
Transcriptional Research at Oncogene Science, Inc., a pharmaceutical company,
where he led Oncogene's research efforts in the development of mammalian
cell-based assays for gene transcription and the automation of these assays for
selection of therapeutic targets and compounds. Dr. Case earned a Ph.D. in
biochemistry from the University of California, Davis and a B.S. in biology from
San Diego State University.

     Peter Bluford has served as Vice President, Corporate Development since
December 1997 and since joining us has had operating responsibility for
Sangamo's licensing, intellectual property and business planning activities. Mr.
Bluford also served as Senior Director, Corporate Development, from October 1996
to November 1997. From October 1992 to September 1996, Mr. Bluford served as
Director, Commercial Development at Somatix Therapy Corporation, where he was
responsible for Somatix's strategic business planning activities while also
serving as Project Team Leader, Oncology from 1995 to 1996. From 1991 to 1992,
Mr. Bluford was with Celtrix Pharmaceuticals, Inc. as Manager, Strategic Market
Planning. From 1990 to 1991, he was Manager of Strategic Planning with
BioGrowth, Inc. Mr. Bluford received an M.B.A. and a B.S. in biochemistry from
the University of California, Berkeley.

     Shawn K. Johnson has served as Director of Finance since December 1997.
From July 1995 to October 1997, Mr. Johnson was Director of Finance at
Neurobiological Technologies, Inc., a neuroscience company developing drugs.
From July 1993 to June 1995, he managed various accounting functions for
Glycomed, Inc., a pharmaceutical company. Prior to Glycomed, Mr. Johnson was the
Controller for Cognitive Systems, Inc., a software technology company. He holds
an M.B.A. from the University of California, Berkeley and a B.S. in accounting
from City University in Bellevue, Washington.

     Eric T. Rhodes has served as Director of Commercial Development since July
1998 and has primary responsibility for management of our Universal GeneTools
business. Prior to joining Sangamo, Mr. Rhodes served in a variety of capacities
at Incyte Pharmaceuticals, Inc., a genomic database and data management software
company, from March 1994 to July 1998. He initially served as part of the team
responsible for expansion of Incyte's high throughput sequencing capabilities
and later worked in the business development group where his primary focus was
the evaluation and acquisition of new technologies. From 1991 to 1994, Mr.
Rhodes directed the molecular biology group at Anergen, Inc., a biotechnology
company focusing on treatment of autoimmune disease and prior to that he was
with BioGrowth, Inc., from 1989 to 1991 and Triton BioSciences, a biotechnology
company, as a molecular biologist from 1987 to 1989. Mr. Rhodes received a B.S.
in microbiology and immunology from the University of California, Berkeley.

     S. Kaye Spratt, Ph.D. has served as Director of Delivery Technology since
January 1998 and is currently directing Sangamo's cell biology and gene therapy
efforts for the evaluation and delivery of engineered zinc finger proteins. From
June 1997 to January 1998, Dr. Spratt was employed by Acacia Biosciences, a
biotechnology research company, as Project Manager. From June 1992 to June 1997,
Dr. Spratt was employed by Somatix Therapy Corporation as Section Manager and
Senior Scientist responsible for the design, development and production of
research and clinical grade gene therapy vectors. From 1987 to 1992, Dr. Spratt
was Senior Scientist and Project Leader for BioGrowth Inc. Dr. Spratt received a
Ph.D. in microbial genetics from Meharry Medical College and a B.S. in biology
from Langston University.

     Herbert W. Boyer, Ph.D. has served as a Director since July 1997. Dr. Boyer
is the co-inventor of recombinant DNA technology with Dr. Stanley Cohen and
founded Genentech, Inc., a biopharmaceutical company, in 1976. Dr. Boyer is
currently Professor Emeritus at the University of California, San Francisco. Dr.
Boyer has served as a director of Genentech since 1976 and was Vice

                                       44
<PAGE>   48
Diagram is entitled "Universal Gene Recognition(TM)." Immediately below reads,
"Engineered ZFP(TM) Transcription Factors." A line leads from that language to
four boxes containing, respectively from left to right: "Universal Gene Tools,"
"ZFP Therapeutics," "ZFP Diagnostics," and "Agricultural and Industrial
Biotechnology." Below the "Universal Gene Tools" box is a bulleted list: "Drug
Target Discovery," "Drug Target Validation," and "Pharmaceutical Discovery."
Below the "ZFP Therapeutics" box is a bulleted list: "Therapeutic Regulation of
Disease-Related Genes," "Activation," "Repression," "Reversible Control," and
"Pharmaceutical Protein Production." Below the "ZFP Diagnostics" box is a
bulleted list: "Clinical Diagnostics" and "Pharmcogenomics." Below the
"Agricultural and Industrial Biotechnology" box is a bulleted list:
"Agrochemical Discovery," "ZFP-Transgenic Plants," and "Biological Production of
Industrial Chemicals."
<PAGE>   49


In the top left corner is the title "Universal Gene Recognition Technology
Platform." Immediately below the title reads, "ZFP, zinc finger DNA binding
protein, transcription factors regulate the expression of clinically and
commercially important genes." To the right of that language is a short coil on
top of a thin cylinder, with "A single zinc finger recognizes three base pairs,
3 bp, of DNA" immediately below. To the right of that is a medium length series
of coils on top of a thin cylinder, with "Three zinc fingers recognize nine base
pairs, 9 bp, of DNA. ZFPs can be linked together to recognize longer sequences
of DNA" immediately below. Near the top right corner is a long series of coils
on top of a thin cylinder labeled "Recognition domain." Immediately below reads,
"ZFP transcription factors have two parts:" along with two bulleted points, "The
ZFP recognition domain directs the ZFP to its target site in the DNA" and "The
functional domain causes the target gene to be activated or repressed." To the
right of the long series of coils is an oval, labeled "Functional domain," with
an arrow pointing to the coils.

In the left portion of the diagram is a double helix. Above and to the left of
the double helix states, "Different sets of genes are expressed in different
cell types. It is this pattern of gene expression that determines the structure,
biological function and health of all cells, tissues and organisms. Genes are
regulated, either activated or repressed, by DNA binding proteins called
transcription factors." To the right of that is a large coil on top of half a
tube divided lengthwise. Immediately below is a multi-colored strand. Above and
to the right reads, "Sangamo scientists design ZFP transcription factors to
recognize and regulate target genes." Below and to the right of the images is
the coil shown on top of the strand with the cylindrical portion below it
highlighted.

To the right of the middle is a long double helix with half of one helix
multi-colored. Resting on the multi-colored portion is a series of coils. To the
left of the coils is a green oval with a plus sign in the middle and a line
connecting it to the left-most portion of the coils. Immediately above this
image reads, "Once the ZFP transcription factor binds to its target DNA
sequence, it can regulate the target gene in a variety of ways. For example, the
target gene can be activated..."

To the right of the long double helix is a shorter double helix with half of one
helix multi-colored. Resting on the multi-colored portion is a series of coils.
To the left of the coils is a red oval with a minus sign in the middle and a
line connecting it to the left-most portion of the coils. Immediately above this
image reads, "...or repressed."

In the bottom right corner of the diagram reads, "ZFP transcription factors
can:" followed by bulleted points: "Activate genes," "Repress genes," "Switch
genes on or off temporarily," and "Detect specific DNA sequences." Below this
list reads, "The ability of engineered ZFPs to recognize and regulate genes has
broad-based applications in pharmaceutical discovery, therapeutics for the
treatment of human diseases, clinical diagnostics, and agricultural and
industrial biotechnology."
<PAGE>   50

President of Research from 1976 to 1990. Dr. Boyer was also a Professor of
biochemistry and biophysics at the University of California, San Francisco from
1966 to 1991 where he retains the position of Professor Emeritus. He was also an
Investigator for the Howard Hughes Medical Institute from 1976 to 1983. He has
authored over 100 scientific publications and is a member of the National
Academy of Sciences. Dr. Boyer has received numerous research awards including
the National Medal of Science, the National Medal of Technology and the Albert
Lasker Basic Medical Research Award. Dr. Boyer is Chairman of the Board of
Directors of Allergan, Inc., a pharmaceutical company and a trustee of the
Scripps Research Institute. Dr. Boyer received a Ph.D. in microbiology from the
University of Pittsburgh and a B.A. in biology from St. Vincent College.

     William G. Gerber, M.D. has served as a member of our board of directors
since June 1997. Dr. Gerber is currently Chief Executive Officer and a Director
of Epoch Pharmaceuticals, Inc., a biomedical company, where he has been since
September 1999. From April 1998 to July 1999, he was President of diaDexus LLC,
a pharmacogenomics company. Previous to his appointment at diaDexus, he was
Chief Operating Officer of Onyx Pharmaceuticals. Before joining Onyx in 1995,
Dr. Gerber was with Chiron Corporation, a biopharmaceutical, vaccine and blood
testing company, where he was President of the Chiron Diagnostics business unit
after Chiron's merger with Cetus Corporation in December 1991. He joined Cetus
in 1987 as senior director of corporate ventures and was named Vice President
and General Manager of the PCR (Polymerase Chain Reaction) Division in November
1988. Dr. Gerber earned his B.S. and M.D. degrees from the University of
California, San Francisco School of Medicine.

     John W. Larson has served as a member of our board of directors since
January 1996. Mr. Larson has served as senior partner at the law firm of
Brobeck, Phleger & Harrison LLP since March 1996. From 1988 until March 1996,
Mr. Larson was Chief Executive Officer of the firm. He has been a partner with
the firm since 1969, except for the period from July 1971 to September 1973 when
he was in government service as Assistant Secretary of the United States
Department of the Interior and Counselor to George P. Shultz, Chairman of the
Cost of Living Council. Mr. Larson holds an L.L.B. and a B.A., with distinction,
in Economics, from Stanford University.

     William J. Rutter, Ph.D. has served as a member of our board of directors
since January 2000. He is the co-founder of Chiron Corporation, a
biopharmaceutical, vaccine and blood testing company, and served as its Chairman
of the Board of Directors from Chiron's inception in 1981 until May 1999. From
August 1983 through April 1989, in addition to his responsibilities at Chiron,
Dr. Rutter was the Director of the Hormone Research Institute at UCSF, and he
became a Professor Emeritus in 1991. In 1969, Dr. Rutter joined the faculty of
the University of California, San Francisco as a Herzstein Professor, and served
as the chairman of the Department of Biochemistry and Biophysics at UCSF from
1969 to 1982. Dr. Rutter has also served on the Board of Overseers at Harvard
University since 1992, on the Board of Trustees at the Carnegie Institution of
Washington since 1995 and several private company boards. Dr. Rutter received
his Ph.D. in biochemistry from the University of Illinois, an M.S. in
biochemistry from the University of Utah and a B.A. in biochemistry from Harvard
University.

     Michael C. Wood has served as a member of our board of directors since our
inception. Mr. Wood is currently President of Knowledge Kids Enterprises, Inc.,
an educational company which he founded in January 1995. Mr. Wood has 15 years
of experience in the corporate legal representation of high technology firms and
venture capital partnerships. From 1991 through 1994, he was a partner of the
emerging technology companies group at Cooley Godward LLP. From 1979 to 1991,
Mr. Wood practiced corporate law in the high technology practice of Crosby Heafy
Roach & May. Mr. Wood received a J.D. from the Hastings College of Law, an
M.B.A. from the University of California, Berkeley and his B.A. in political
science from Stanford University.

                                       45
<PAGE>   51

SCIENTIFIC ADVISORY BOARD

     We use scientists and physicians to advise us on scientific matters as a
part of our Scientific Advisory Board, including experts in molecular biology,
structural biology, biophysics, biochemistry, cell biology, and gene expression.
Generally, our scientific advisors have received options to purchase our common
stock as compensation for their consulting services.

     The following individuals are members of our Scientific Advisory Board:

     Carl Pabo, Ph.D. (Chairman) is a professor of biophysics and structural
biology at the Massachusetts Institute of Technology and an investigator in the
Howard Hughes Medical Institute. Dr. Pabo is a pioneer in the structural
analysis and modification of zinc finger DNA binding proteins and has made many
of the fundamental observations as to how ZFPs interact with their DNA binding
sites. Dr. Pabo received a Ph.D. in biochemistry and molecular biology from
Harvard University and a B.S. in molecular biophysics and biochemistry from Yale
College. He is a member of the National Academy of Sciences and of the American
Academy of Arts and Sciences.

     Carlos F. Barbas III, Ph.D. is an Associate Member of The Scripps Research
Institute, where he has been since 1991. Dr. Barbas is an expert in the
selection of ZFPs and has published several papers on the use of ZFP
transcription factors to regulate gene expression. From 1989 to 1991, he was a
postdoctoral fellow at The Scripps Research Institute and Pennsylvania State
University. Dr. Barbas received his Ph.D. in chemistry from Texas A&M University
and a B.S. in chemistry and physics from Eckerd College.

     Jeremy M. Berg, Ph.D. is Professor and Director of the Department of
Biophysics and Biophysical Chemistry at The Johns Hopkins University School of
Medicine, where he has been since 1990. He is a leader in the field of ZFPs, and
the Berg laboratory was one of the first to demonstrate the use of designed zinc
finger arrays for the generation of novel, sequence-specific ZFPs. From 1986 to
1990, Dr. Berg was an associate professor in the Department of Chemistry at The
Johns Hopkins University, and a postdoctoral fellow in the School of Medicine
from 1984 to 1986. Dr. Berg received his Ph.D. in chemistry from Harvard
University and a B.S. and M.S. degrees in chemistry from Stanford University.

     Judith Campisi, Ph.D. is Head, Center for Research and Education in Aging
Life Sciences Division of the Berkeley National Laboratory, where she has been
conducting aging and cancer research since 1990. From 1984 to 1990, Dr. Campisi
held professorships within the Department of Biochemistry at the Boston
University School of Medicine. Dr. Campisi received her Ph.D. in biochemistry
and a B.A. in chemistry from the State University of New York, Stony Brook.

     Srinivasan Chandrasegaran, Ph.D. is an associate professor at The Johns
Hopkins University School of Hygiene and Public Health, and a leading expert on
the molecular biology, structure and function of type IIs restriction
endonucleases. He has collaborated with Sangamo on the development of our DNA
diagnostic program. Dr. Chandrasegaran received his Ph.D. in chemistry from
Georgetown University, and B.S. and M.S. degrees in chemistry from Madras
University.

     George N. ("Joe") Cox, Ph.D. is President and Chief Scientific Officer of
Bolder Biotech, a protein delivery biotechnology company. Dr. Cox was Vice
President, Research and Development at Sangamo from March 1995 to June 1998. He
spent the previous 12 years of his career at Synergen, Inc., in various
positions including Group Leader, Discovery Research, Chairman of Synergen's
science counsel, Director of Animal Health Care, and Senior Scientist. He
received a Ph.D. in biology from the University of California, Santa Cruz and a
B.S. in biology from Wesleyan University.

                                       46
<PAGE>   52

     Hamilton O. Smith, M.D. is currently a Professor Emeritus of molecular
biology and genetics at The Johns Hopkins University School of Medicine and
Director of DNA Resources at Celera Genomics Corporation. Dr. Smith received the
1978 Nobel Prize in Medicine for his co-discovery of type IIs restriction
enzymes. Dr. Smith has gone on to publish extensively on the genetic and genomic
analysis of haemophilus influenzae and its natural transformation system. Dr.
Smith is an American Cancer Society Research Professor and member of the
National Academy of Sciences. He received his M.D. from The Johns Hopkins
University School of Medicine, an A.B. in mathematics from the University of
California, Berkeley, and a B.S. from the University of Illinois, Urbana.

     Kevin Struhl, Ph.D. is the David Wesley Gaiser Professor of Biological
Chemistry in the Department of Biological Chemistry and Molecular Pharmacology
at Harvard Medical School. Dr. Struhl has established many of the principles
involved in the molecular mechanisms of transcriptional activation and
repression in eukaryotic cells including the recruitment of gene-specific and
general transcription factors as well as histone deacetylases. Dr. Struhl
received his Ph.D. in biochemistry from Stanford University, and S.M. and S.B.
degrees from the Massachusetts Institute of Technology.

     Elton T. ("Ted") Young, Ph.D. is a professor of biochemistry and genetics
at the University of Washington in Seattle. Dr. Young has published numerous
articles in the field of transcription factors and this remains a focus of his
ongoing research at the University of Washington. Dr. Young has served as an
editor for the Journal of Molecular and Cellular Biology since 1983. He received
his Ph.D. in biophysics from the California Institute of Technology and has a
B.A. in chemistry from the University of Colorado at Boulder.

     Alan P. Wolffe, Ph.D. joined Sangamo as its Senior Vice President and Chief
Scientific Officer in March 2000. Dr. Wolffe is internationally recognized for
his research on chromatin structure and its role in the regulation of gene
expression, with over 250 research publications on this topic. He was Director
of the Department of Molecular Embryology at the National Institutes of Child
Health and Human Development from 1990 until March 2000. During this time, Dr.
Wolffe's laboratory discovered the determinants of chromosonal gene regulation
by ZFPs, including observations that have proven fundamental to the
understanding of histone acetylation and deacetylation in transcriptional
control. Dr. Wolffe has received numerous prizes for his research and serves as
an editor on the editorial boards of Biochemistry, Journal of Cell Science,
Molecular Biology of the Cell, Molecular Cell Biology, Nucleic Acids Research,
and Science. Dr. Wolffe received a Ph.D. in molecular biology from the Medical
Research Council and a B.A. in biochemistry from Oxford University.

BOARD COMMITTEES

     Audit Committee. We have established an audit committee composed of
independent directors that review and supervise our financial controls,
including the selection of our auditors, reviews our books and accounts, meets
with our officers regarding our financial controls, acts upon recommendations of
our auditors and takes further actions as the audit committee deems necessary to
complete an audit of our books and accounts, as well as other matters that may
come before it or as directed by the board. The audit committee currently
consists of Dr. Gerber, Dr. Rutter and Mr. Wood.

     Compensation Committee. We have also established a compensation committee
that reviews and approves the compensation and benefits for our executive
officers, administers our compensation and stock plans, makes recommendations to
the board of directors regarding such matters and performs other duties as may
from time-to-time be determined by the board. The compensation committee
currently consists of Dr. Boyer and Mr. Larson.

                                       47
<PAGE>   53

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     The members of the compensation committee of the board of directors are Dr.
Boyer and Mr. Larson. None of our compensation committee members has been an
officer or employee of Sangamo at any time. Mr. Larson is a senior partner at
Brobeck, Phleger & Harrison LLP, our legal counsel. None of our executive
officers serves on the board of directors or compensation committee of any
entity that has one or more executive officers serving as a member of our board
or our compensation committee.

COMPENSATION OF DIRECTORS

     Other than expenses in connection with attendance at meetings and other
customary expenses, we currently do not compensate any non-employee member of
the board. Directors who are also employees do not receive additional
compensation for serving as directors.

     Under our 2000 Stock Incentive Plan, non-employee directors will receive
automatic option grants upon becoming directors each of which is determined by
the board of directors and 10,000 shares on the date of each annual meeting of
stockholders. The 2000 Stock Incentive Plan also contains a director fee option
grant program. Should this program be activated in the future, each non-employee
board member will have the opportunity to apply all or a portion of any annual
retainer fee otherwise payable in cash to the acquisition of an option with an
exercise price below the then fair market value of our shares. Non-employee
directors will also be eligible to receive discretionary option grants and
direct stock issuances under our 2000 Stock Incentive Plan. See
"Management -- Stock Plans."

EXECUTIVE COMPENSATION

     The following table sets forth information concerning compensation earned
during the fiscal year ended December 31, 1999 by our Chief Executive Officer
and our other executive officers whose total annual compensation exceeded
$100,000.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                LONG-TERM
                                                               COMPENSATION
                                                                  AWARDS
                                                               ------------
                                        ANNUAL COMPENSATION     SECURITIES
                              FISCAL    -------------------     UNDERLYING         OTHER
NAME AND PRINCIPAL POSITION    YEAR      SALARY      BONUS       OPTIONS        COMPENSATION
- ---------------------------   ------    --------    -------    ------------    --------------
<S>                           <C>       <C>         <C>        <C>             <C>
Edward O. Lanphier II.......   1999     $195,000    $73,788           --       $       12,500
  President and Chief
     Executive Officer
Casey C. Case, Ph.D. .......   1999      131,250     10,000       30,000                   --
  Vice President, Research
Peter Bluford...............   1999      120,750     10,000       40,000                   --
  Vice President, Corporate
     Development
</TABLE>

     On January 4, 1998, Mr. Lanphier received a loan from us in the principal
amount of $250,000. The loan bears interest at a rate of 6% per year. As a
special bonus program for Mr. Lanphier the balance of the loan will be forgiven
in forty-eight equal monthly installments of principal, together with accrued
interest for the year, upon completion of each month of employment with us over
the forty-eight month period measured from the date the loan was made.
Accordingly, Mr. Lanphier's

                                       48
<PAGE>   54

reported bonus amount represents the $73,788 of loan forgiveness which occurred
on December 31, 1999.

     Other compensation for Mr. Lanphier consists of an insurance premium paid
by Sangamo on a split dollar life insurance policy. Sangamo will be reimbursed
for these insurance premiums out of the cash surrender value of its policy paid
by Mr. Lanphier during his lifetime or out of the proceeds paid under the policy
upon his death. The face amount of the insurance policy is $2.0 million.

OPTION GRANTS

     The following table sets forth summary information regarding the option
grants made to our Chief Executive Officer and the other executive officers
whose total annual compensation exceeded $100,000 for 1999. Options granted
under our 1995 Stock Option Plan are generally immediately exercisable for all
the option shares by the optionee but exercised shares are subject to a right of
repurchase according to the vesting schedule of each specific grant. In the
event that a purchaser ceases to provide service to Sangamo, we have the right
to repurchase any of that person's unvested shares of common stock at the
original option exercise price. The exercise price per share is equal to the
fair market value of our common stock on the date of grant as determined by our
board of directors. Twenty-five percent of the option shares vest on the one
year anniversary of employment and the remainder vest in a series of equal
monthly installments beginning on the one year anniversary of employment and
continuing over the next three years of service. The percentage of total options
was calculated based on options to purchase an aggregate of 305,500 shares of
common stock granted to employees under our 1995 Stock Option Plan in 1999. The
potential realizable value was calculated based on the ten-year term of the
options and assumed rates of stock appreciation of 5% and 10%, compounded
annually from the date the options were granted to their expiration date based
on the fair market value of the common stock on the date of grant.

                             OPTION GRANTS IN 1999

<TABLE>
<CAPTION>
                                                                                         POTENTIAL REALIZABLE
                                                                                               VALUE AT
                                                                                            ASSUMED ANNUAL
                                                                                               RATES OF
                              NUMBER OF    PERCENTAGE OF                                      STOCK PRICE
                             SECURITIES    TOTAL OPTIONS                                   APPRECIATION FOR
                             UNDERLYING     GRANTED TO                                        OPTION TERM
                               OPTIONS     EMPLOYEES IN    EXERCISE PRICE   EXPIRATION   ---------------------
           NAME                GRANTED      FISCAL 1999     (PER SHARE)        DATE         5%          10%
           ----              -----------   -------------   --------------   ----------   --------    ---------
<S>                          <C>           <C>             <C>              <C>          <C>         <C>
Edward O. Lanphier II......        --            --%           $   --             --      $   --      $    --
Casey C. Case, Ph.D. ......    30,000           9.8             0.225        12/8/09       4,245       10,758
Peter Bluford..............    40,000          13.1             0.225        12/8/09       5,660       14,343
</TABLE>

                                       49
<PAGE>   55

FISCAL YEAR-END 1999 OPTION VALUES

     The following table sets forth summary information regarding the number and
value of options held as of December 31, 1999 for our Chief Executive Officer
and our most highly compensated executive officers whose total annual
compensation exceeded $100,000. Our Chief Executive Officer and our most highly
compensated executive officers did not acquire any shares upon exercise of
options in 1999. Amounts shown in the value of unexercised in-the-money options
at December 31, 1999 column are based on $0.225, the fair market value of the
common stock as of December 31, 1999, multiplied by the number of shares
underlying the option, less the aggregate exercise price payable for these
shares.

                               1999 OPTION VALUES

<TABLE>
<CAPTION>
                                          NUMBER OF SECURITIES
                                               UNDERLYING                 VALUE OF UNEXERCISED
                                         UNEXERCISED OPTIONS AT         IN-THE-MONEY OPTIONS AT
                                           DECEMBER 31, 1999               DECEMBER 31, 1999
                                      ----------------------------    ----------------------------
                NAME                  EXERCISABLE    UNEXERCISABLE    EXERCISABLE    UNEXERCISABLE
                ----                  -----------    -------------    -----------    -------------
<S>                                   <C>            <C>              <C>            <C>
Edward O. Lanphier II...............    400,000           --          $    24,000    $          --
Casey C. Case, Ph.D. ...............    210,000           --               13,500               --
Peter Bluford.......................    260,000           --               31,500               --
</TABLE>

STOCK PLANS

     2000 STOCK INCENTIVE PLAN. The 2000 Stock Incentive Plan is intended to
serve as the successor program to our 1995 Stock Option Plan. The 2000 Stock
Incentive Plan was adopted by the board in February 2000 and was approved by the
stockholders in March 2000. The 2000 Stock Incentive Plan will become effective
when the underwriting agreement for this offering is signed. At that time, all
outstanding options under our 1995 Stock Option Plan will be transferred to the
2000 Stock Incentive Plan, and no further option grants will be made under the
1995 Stock Option Plan. The transferred options will continue to be governed by
their existing terms, unless our compensation committee decides to extend one or
more features of the 2000 Stock Incentive Plan to those options. Except as
otherwise noted below, the transferred options from the 2000 Stock Incentive
Plan have substantially the same terms as will be in effect for grants made
under the discretionary option grant program of our 2000 Stock Incentive Plan.

  Authorized shares

     A total of 3,616,832 shares of our common stock have been authorized for
issuance under the 2000 Stock Incentive Plan. This share reserve consists of the
number of shares we estimate will be carried over from the 1995 Stock Option
Plan including the shares subject to outstanding options thereunder, plus an
additional increase of approximately          shares. The number of shares
authorized for issuance under our 2000 Stock Incentive Plan will automatically
increase on the first trading day of the fiscal year, beginning in 2001, by an
amount equal to three and one-half percent of the total number of shares of our
common stock outstanding on the last trading day immediately preceding fiscal
year, but in no event will this annual increase exceed 2,000,000 shares. In
addition, the 2000 Stock Incentive Plan prohibits stock option grants or direct
stock issuances for more than 2,000,000 shares of common stock in total in any
calendar year.

                                       50
<PAGE>   56

  Stock Options

     Our 2000 Stock Incentive Plan has five separate programs:

     - the discretionary option grant program, under which eligible individuals
       in our employ may be granted options to purchase shares of our common
       stock at an exercise price not less than the fair market value of those
       shares on the grant date;

     - the stock issuance program, under which eligible individuals may be
       issued shares of common stock directly through the purchase of such
       shares at a price not less than 100% of the then fair market value at
       time of issuance or as a bonus tied to the attainment of performance
       milestones or the completion of a specified period of services;

     - the salary investment option grant program, under which our executive
       officers and other highly compensated employees may be given the
       opportunity to apply a portion of their base salary each year to the
       acquisition of special below market stock option grants;

     - the automatic option grant program, under which option grants will
       automatically be made at periodic intervals to eligible non-employee
       members of our board of directors to purchase shares of common stock at
       an exercise price equal to the fair market value of those shares on the
       grant date; and

     - the director fee option grant program, under which non-employee members
       of our board of directors may be given the opportunity to apply a portion
       of any retainer fee otherwise payable to them in cash each year to the
       acquisition of special below-market option grants.

     The individuals eligible to participate in our 2000 Stock Incentive Plan
include our officers and other employees, our board members and any consultants
we hire.

  Plan Administration

     The discretionary option grant and stock issuance programs will be
administered by our compensation committee. This committee will determine which
eligible individuals are to receive option grants or stock issuances under those
programs, the time or times when the grants or issuances are to be made, the
number of shares subject to each grant or issuance, the status of any granted
option as either an incentive stock option or a non-statutory stock option under
the federal tax laws, the vesting schedule to be in effect for the option grant
or stock issuance and the maximum term for which any granted option is to remain
outstanding. The compensation committee will also have the authority to select
the executive officers and other highly compensated employees who may
participate in the salary investment option grant program if that program is put
into effect for one or more calendar years.

     Our 2000 Stock Incentive Plan will include the following features:

     - The exercise price for any options granted under the 2000 Stock Incentive
       Plan may be paid in cash or in shares of our common stock valued at fair
       market value on the exercise date. The option may also be exercised
       through a same-day sale program without any cash outlay by the optionees.
       The compensation committee may provide financial assistance to one or
       more optionees in the exercise of their options by allowing such
       individuals to deliver full-recourse interest-bearing promissory notes in
       payment of the exercise price and any associated withholding taxes.

     - The compensation committee will have the authority to cancel outstanding
       options under the discretionary option grant program, including any
       transferred options from our 1995 Stock Option Plan, in return for the
       grant of new options for the same or a different number of option shares
       with an exercise price per share based upon the fair market value of our
       common stock on the new grant date.

                                       51
<PAGE>   57

     - Stock appreciation rights may be issued under the discretionary option
       grant program. These rights will provide the holders with the election to
       surrender their outstanding options for a payment from us equal to the
       fair market value of the shares subject to the surrendered options less
       the exercise price payable for those shares. We may make the payment in
       cash or in shares of our common stock. None of the options under our 1995
       Stock Option Plan have any stock appreciation rights.

  Changes in Control

     The 2000 Stock Incentive Plan will include the following change in control
provisions which may result in the accelerated vesting of outstanding option
grants and stock issuances:

     - If we are acquired by merger or asset sale, each outstanding option under
       the discretionary option grant program which is not to be assumed by the
       successor corporation will immediately become exercisable for all the
       option shares, and all outstanding unvested shares will immediately vest,
       except to the extent our repurchase rights with respect to those shares
       are to be assigned to the successor corporation.

     - The compensation committee will have complete discretion to grant one or
       more options that will become exercisable for all the option shares if
       those options are assumed in the acquisition but the optionee's service
       with us or the acquiring entity is subsequently terminated. The vesting
       of any outstanding shares under the stock issuance programs may be
       accelerated upon similar terms and conditions. The compensation committee
       will also have the authority to grant options which will immediately vest
       in the event we are acquired, whether or not those options are assumed.

     - The compensation committee may grant options and structure repurchase
       rights so that the shares subject to those options or repurchase rights
       will immediately vest in connection with a successful tender offer for
       more than 50% of our outstanding voting stock or a change in the majority
       of our board through one or more contested elections. This accelerated
       vesting may occur either at the time of this type of transaction or upon
       the subsequent termination of the individual's service.

     - If we are acquired by merger or asset sale, the options currently
       outstanding under the 1995 Stock Option Plan will accelerate in full if
       the options are not assumed by the acquiring entity and the optionee's
       employment with us is involuntarily terminated within 12 months following
       the acquisition. If the options are not so assumed, they will accelerate
       and become exercisable for fully vested shares immediately before the
       acquisition and will terminate upon the completion of the acquisition.

  Salary Investment Option Grant Program

     If the compensation committee decides to put the salary investment option
grant program into effect for one or more calendar years, each of our executive
officers and other highly compensated employees may elect to reduce his or her
base salary for the calendar year by an amount not less than $10,000 nor more
than $50,000. Each selected individual who makes this election will
automatically be granted, on the first trading day in January of the calendar
year for which his or her salary reduction is to be in effect, an option to
purchase that number of shares of common stock determined by dividing the salary
reduction amount by two-thirds of the fair market value per share of our common
stock on the grant date. The option will have an exercise price per share equal
to one-third of the fair market value of the option shares on the grant date. As
a result, the option will be structured so that the fair market value of the
option shares on the grant date less the exercise price payable for those shares
will be equal to the amount of the salary reduction. The option will

                                       52
<PAGE>   58

become exercisable in a series of twelve equal monthly installments over the
calendar year for which the salary reduction is to be in effect.

  Automatic Option Grant Program

     Under the automatic option grant program, each individual who first becomes
a non-employee board member at any time after the effective date of this
offering will receive an option grant to purchase the number of shares of common
stock as determined by the board on the date the individual joins the board. In
addition, on the date of each annual stockholders meeting held in 2001 and
thereafter, each non-employee board member who is to continue to serve as a
non-employee board member, including each of our current non-employee board
members, will automatically be granted an option to purchase 10,000 shares of
common stock, provided the individual has served on the board for at least six
months.

     Each automatic grant will have an exercise price per share equal to the
fair market value per share of our common stock on the grant date and will have
a term of 10 years, subject to earlier termination following the optionee's
cessation of board service. The option will be immediately exercisable for all
of the option shares; however, we may repurchase, at the exercise price paid per
share, any shares purchased under the option which are not vested at the time of
the optionee's cessation of board service. The shares subject to each initial
option grant will vest in a series of 36 equal monthly installments upon the
optionee's completion of each month of board service measured from the grant
date. The shares subject to each 10,000 share annual option grant will vest in a
series of 12 equal monthly installments upon completion of each month of board
service over the 12-month period measured from the grant date. The shares
subject to each option will immediately vest in full over the 36-month period
upon the optionee's death or disability while a board member.

  Director Fee Option Grant Program

     If the director fee option grant program is put into effect in the future,
then each non-employee board member may elect to apply all or a portion of any
cash retainer fee for the year to the acquisition of a below-market option
grant. The option grant will automatically be made on the first trading day in
January in the year for which the retainer fee would otherwise be payable in
cash. The option will have an exercise price per share equal to one-third of the
fair market value of the option shares on the grant date, and the number of
shares subject to the option will be determined by dividing the amount of the
retainer fee applied to the program by two-thirds of the fair market value per
share of our common stock on the grant date. As a result, the option will be
structured so that the fair market value of the option shares on the grant date
less the exercise price payable for those shares will be equal to the portion of
the retainer fee applied to that option. The option will become exercisable in a
series of 12 equal monthly installments over the calendar year for which the
election is in effect. The option, however, will become immediately exercisable
for all the option shares upon the death or disability of the optionee while
serving as a board member.

     Our 2000 Stock Incentive Plan will also have the following features:

     - Outstanding options under the salary investment option grant program and
       the automatic and director fee option grant programs will immediately
       vest if we are acquired by a merger or asset sale or if there is a
       successful tender offer for more than 50% of our outstanding voting stock
       or a change in the majority of our board through one or more contested
       elections.

     - Limited stock appreciation rights will automatically be included as part
       of each grant made under the salary investment option grant program and
       the automatic and director fee option grant programs, and these rights
       may also be granted to one or more officers as part of their option
       grants under the discretionary option grant program. Options with this
       feature may be surrendered to us upon the successful completion of a
       hostile tender offer for more than 50%

                                       53
<PAGE>   59

       of our outstanding voting stock. In return for the surrendered option,
       the optionee will be entitled to a cash distribution from us in an amount
       per surrendered option share based upon the highest price per share of
       our common stock paid in that tender offer.

     - The board may amend or modify the 2000 Stock Incentive Plan at any time,
       subject to any required stockholder approval. The 2000 Stock Incentive
       Plan will terminate no later than February 7, 2010.

     EMPLOYEE STOCK PURCHASE PLAN. Our Employee Stock Purchase Plan was adopted
by the board in February 2000 and approved by the stockholders in March 2000.
The Employee Stock Purchase Plan will become effective immediately upon the
signing of the underwriting agreement for this offering. The plan is designed to
allow our eligible employees and the eligible employees in our participating
subsidiaries, if any, to purchase shares of common stock, at semi-annual
intervals, with their accumulated payroll deductions.

  Authorized Shares

     A total of 400,000 shares of our common stock will initially be reserved
for issuance under our Employee Stock Purchase Plan. The reserve will
automatically increase on the first trading day of the second fiscal quarter
each year, beginning in the year 2001, by an amount equal to one percent of the
total number of outstanding shares of our common stock on the last trading day
of the immediately preceding first fiscal quarter. In no event will any annual
reserve increase exceed 600,000 shares.

  Plan Administration

     The plan will have a series of successive overlapping offering periods,
with a new offering period beginning on the first business day of May and
November of each year. Each offering period will continue for a period of 24
months, unless otherwise determined by our compensation committee. The initial
offering period, however, will start on the date the underwriting agreement for
this offering is signed and will end on the last business day of April 2002. The
next offering period will start on the first business day of November 2000.

     Individuals scheduled to work more than 20 hours per week for more than
five calendar months per year may join an offering period on the start date of
that period. Employees may participate in only one offering period at any time.

     A participant may contribute up to 15% of his or her cash earnings through
payroll deductions, and the accumulated deductions will be applied to the
purchase of shares on each semi-annual purchase date. Semi-annual purchase dates
will occur on the last business day of April and October each year, with the
first purchase to occur on the last business day of October 2000. The purchase
price per share on each semi-annual purchase date will be equal to 85% of the
fair market value per share on the start date of the offering period or, if
lower, 85% of the fair market value per share on the semi-annual purchase date.
A participant, however, may not purchase more than 2,000 shares on any purchase
date, and not more than 200,000 shares may be purchased in total by all
participants on any purchase date. Our compensation committee will have the
authority to change these limitations for any subsequent offering period.

  Changes in Control

     If the fair market value per share of our common stock on any purchase date
is less than the fair market value per share on the start date of the 24-month
offering period, then that offering period

                                       54
<PAGE>   60

will automatically terminate, and all participants in the terminated offering
will be transferred to the new offering period commencing immediately
thereafter.

     Should we be acquired by merger or sale of substantially all of our assets
or more than 50% of our voting securities, then all outstanding purchase rights
will automatically be exercised immediately prior to the effective date of the
acquisition. The purchase price will be equal to 85% of the market value per
share on the start date of the offering period in which the acquisition occurs
or, if lower, 85% of the fair market value per share immediately prior to the
acquisition.

     The following provisions will also be in effect under the Employee Stock
Purchase Plan:

     - The plan will terminate no later than the last business day of January
       2010.

     - The board may at any time amend, suspend or discontinue the Employee
       Stock Purchase Plan. Some amendments may require stockholder approval.

TERMINATION OF EMPLOYMENT ARRANGEMENT AND CHANGE IN CONTROL ARRANGEMENTS

     In May 1997, we entered into an agreement with Edward O. Lanphier II, our
current President and Chief Executive Officer. Under the terms of the agreement,
Mr. Lanphier will receive an annual salary, an optional bonus payment and common
stock and stock options based on the achievement of some milestones. If Mr.
Lanphier is terminated without cause, he will be entitled to his base salary for
a period of twelve months plus customary benefits for that period. In the event
of a change in control, the unvested portion of his options will vest.

     On January 4, 1998, Mr. Lanphier received a loan from us in the principal
amount of $250,000. The loan bears interest at a rate of 6% per year and will be
forgiven in forty-eight equal monthly installments of principal together with
all accrued interest upon his completion of each month of employment with us
over the forty-eight month period measured from the date the loan was made. If
Mr. Lanphier is terminated without cause, the balance of the loan will be
forgiven. A change of control will be deemed a termination without cause.

LIMITATION OF LIABILITY AND INDEMNIFICATION

     Our certificate of incorporation eliminates, to the maximum extent allowed
by the Delaware General Corporation Law, directors' personal liability to us or
our stockholders for monetary damages or breaches of fiduciary duties. The
certificate of incorporation of Sangamo does not, however, eliminate or limit
the personal liability of a director for the following:

     - any breach of the director's duty of loyalty to us or our stockholders;

     - acts or omissions not in good faith or that involve intentional
       misconduct or a knowing violation of law;

     - unlawful payments of dividends or unlawful stock repurchases or
       redemptions; or

     - any transaction from which the director derived an improper personal
       benefit.

     Our bylaws provide that we shall indemnify our directors and executive
officers to the fullest extent permitted under the Delaware General Corporation
Law and may indemnify our other officers, employees and other agents as set
forth in the Delaware General Corporation Law. In addition, we have entered into
an indemnification agreement with each of our directors and executive officers.
The indemnification agreements contain provisions that require us, among other
things, to indemnify our directors and executive officers against liabilities
(other than liabilities arising from intentional or knowing and culpable
violations of law) that may arise by reason of their status or service as
directors or executive officers of Sangamo or other entities to which they
provide service at our request and to

                                       55
<PAGE>   61

advance expenses they may incur as a result of any proceeding against them as to
which they could be indemnified. We believe that these bylaw provisions and
indemnification agreements are necessary to attract and retain qualified
directors and officers.

     Prior to the consummation of the offering, we will obtain additional
insurance which covers directors and officers for claims they may otherwise be
required to pay or for which we are required to indemnify them and which will
become effective upon consummation of the offering.

     At present, there is no pending litigation or proceeding involving any of
our directors, officers, employees or agents where indemnification will be
required or permitted, and we are not aware of any threatened litigation or
proceeding that may result in a claim for indemnification.

                                       56
<PAGE>   62

                           RELATED PARTY TRANSACTIONS

     Since October 23, 1995, we have issued shares of our preferred stock and
warrants to purchase our preferred stock to investors in private placement
transactions as follows: a total of 791,250 shares of Series A preferred stock
at a price of $1.00 per share and warrants to purchase 65,000 shares of Series A
preferred stock at a price of $1.00 from October 1995 to June 1996; a total of
2,398,000 shares of Series B preferred stock at a price of $3.00 per share and
warrants to purchase 64,981 shares of Series B preferred stock at an exercise
price of $3.00 per share from November 1997 to February 1998; and a total of
2,000,000 shares of Series C preferred stock at a price of $4.50 per share from
August 1999 to January 2000. The following table summarizes the shares of
preferred stock purchased by, and warrants to purchase shares of preferred stock
issued to our executive officers, directors and 5% stockholders and persons and
entities associated with them in these private placement transactions. Shares
and warrants held by affiliated persons and entities have been aggregated. See
"Principal Stockholders." In connection with the above transactions, we entered
into and agreement with the investors providing for registration rights with
respect to these shares. See "Description of Capital Stock -- Registration
Rights."

<TABLE>
<CAPTION>
                                                                         SERIES B
                                                 SERIES A    SERIES B    PREFERRED   SERIES C
                                                 PREFERRED   PREFERRED     STOCK     PREFERRED
                                                   STOCK       STOCK     WARRANTS      STOCK
                                                 ---------   ---------   ---------   ---------
<S>                                              <C>         <C>         <C>         <C>
DIRECTORS
John W. Larson.................................   75,000        84,548    12,682            --
William J. Rutter, Ph.D. ......................       --            --        --       333,333

5% STOCKHOLDERS
Entities affiliated with JAFCO Co., Ltd. ......       --     1,000,000        --       222,223
Lombard Odier & Cie............................       --     1,000,000        --       222,222
Stephens-Sangamo BioSciences LLC...............       --            --        --     1,000,000
</TABLE>

AGREEMENTS WITH OFFICERS AND DIRECTORS

     In May 1997, we entered into an agreement with Edward O. Lanphier II, our
current President and Chief Executive Officer. Under the terms of the agreement,
Mr. Lanphier will receive an annual salary, an optional bonus payment, and
forgiveness of twenty-five percent of an outstanding loan, and common stock and
stock options based on the achievement of some milestones.

     On January 4 , 1998, Mr. Lanphier received a loan from us in the principal
amount of $250,000. The loan bears interest at a rate of 6% per year and will be
forgiven in forty-eight equal monthly installments of principal, together with
all accrued interest, upon his completion of each month of employment with us
over the forty-eight month period measured from the date the loan was made.
$73,788 of the loan was forgiven in 1999. The loan is secured by 500,000 shares
of our common stock. If Mr. Lanphier is terminated without cause, the balance of
the loan will be forgiven. A change of control will be deemed a termination
without cause.

     Mr. Larson, a Director, is also a partner at Brobeck, Phleger & Harrison
LLP, Sangamo's legal counsel.


     On March 17, 2000 we entered into an agreement with Alan Wolffe, our
current Senior Vice President and Chief Scientific Officer under which he will
receive an annual base salary of $250,000 and be eligible for an annual bonus
plus a stock option covering 200,000 shares of our common stock and certain
fringe benefits including payment of relocation expenses.


                                       57
<PAGE>   63


     The agreement also provides that we will loan Dr. Wolffe up to $400,000 to
enable him to purchase up to 50,000 shares of our common stock under this
option. The loan bears interest at seven percent, per annum is payable in three
years or when the stock is sold whichever is earlier and is secured by the stock
being purchased.



     Under the agreement we also loaned Dr. Wolffe $250,000 as a housing
allowance payable in four years from the date of the loan with interest at a
rate of seven percent. Twenty-five percent of the loan and associated interest
will be forgiven on each anniversary of the loan as long as Dr. Wolffe is a full
time employee of Sangamo at such time. We also are going to employ Elizabeth
Wolffe, Dr. Wolffe's wife, formerly a scientist at National Institutes of Health
as a scientist.


     We believe that all of the transactions set forth above were made on terms
no less favorable to us than could have been otherwise obtained from
unaffiliated third parties. All future transactions, including loans, if any,
between us and our officers, directors and principal stockholders and their
affiliates and any transactions between us and any entity with which our
officers, directors or 5% stockholders are affiliated, will be approved by a
majority of the board of directors, including a majority of the independent and
disinterested outside directors of the board of directors and will be on terms
no less favorable to us than could be obtained from unaffiliated third parties.

                                       58
<PAGE>   64

                             PRINCIPAL STOCKHOLDERS

     The table below sets forth information regarding the beneficial ownership
of our common stock as of February 29, 2000, and as adjusted for this offering,
by:

     - each person or entity who is known by us to own beneficially more than 5%
       of our outstanding stock;

     - our Chief Executive Officer and our other executive officers whose total
       annual compensation exceeded $100,000;

     - each of our directors; and

     - all directors and executive officers as a group.


     Each stockholder's percentage ownership in the following table is based on
17,256,144 shares of common stock outstanding as of February 29, 2000. Unless
otherwise indicated, the principal address of each of the stockholders below is
c/o Sangamo BioSciences, Inc., 501 Canal Boulevard, Suite A100, Richmond, CA
94804. Except as otherwise indicated, and subject to applicable community
property laws, except to the extent authority is shared by both spouses under
applicable law, we believe the persons named in the table have sole voting and
investment power with respect to all shares of common stock held by them.


<TABLE>
<CAPTION>
                                                   NUMBER OF              PERCENTAGE OF SHARES
                                                     SHARES                BENEFICIALLY OWNED
                                                  BENEFICIALLY   --------------------------------------
      NAME AND ADDRESS OF BENEFICIAL OWNER           OWNED       PRIOR TO OFFERING   AFTER THE OFFERING
      ------------------------------------        ------------   -----------------   ------------------
<S>                                               <C>            <C>                 <C>
Entities Affiliated with JAFCO Co., Ltd.(1).....   2,444,446             14.2%              10.6%
  1-8-2 Marunouchi, Chiyoda-ku
  Tokyo 100, Japan
Lombard Odier & Cie.............................   2,444,444             14.2               10.6
  Toedistrasse 36, CH-8027
  Zurich, Switzerland
Stephens-Sangamo BioSciences LLC................   2,000,000             11.6                8.7
Edward O. Lanphier II(2)........................   3,820,000             21.6               16.3
Casey C. Case, Ph.D.(3).........................     210,000              1.2                  *
Peter Bluford(4)................................     260,000              1.5                  *
Herbert W. Boyer, Ph.D.(5)......................     100,000                *                  *
William G. Gerber, M.D.(6)......................     100,000                *                  *
John W. Larson(7)...............................     474,460              2.7                2.1
William J. Rutter, Ph.D.(8).....................     766,666              4.4                3.3
Michael C. Wood(9)..............................   1,460,000              8.4                6.3
All directors and executive officers as a group    7,591,126             41.0%              31.3%
  (12 persons)(10)..............................
</TABLE>

- -------------------------
  *  Less than one percent.

 (1) Represents 844,446 shares held by JAFCO Co., Ltd; 246,574 shares held by
     JAFCO G-6(A) Investment Enterprise Partnership; 246,574 shares held by
     JAFCO G-6(B) Investment Enterprise Partnership; 334,246 shares held by
     JAFCO G-7(A) Investment Enterprise Partnership; 334,246 shares held by
     JAFCO G-7(B) Investment Enterprise Partnership; 164,388 shares held by
     JAFCO JS-3 Investment Enterprise Partnership; and 273,972 shares held by
     JAFCO R-3 Investment Enterprise Partnership.

                                       59
<PAGE>   65

 (2) Includes 400,000 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000. Also
     includes 400,000 shares held by Mr. Lanphier's minor children.

 (3) Includes 210,000 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000.

 (4) Includes 260,000 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000.

 (5) Includes 62,624 shares of common stock which are subject to repurchase.

 (6) Includes 64,583 shares of common stock which are subject to repurchase.

 (7) Includes 50,000 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000. Also
     includes warrants to purchase 25,364 shares of common stock.

 (8) Includes 100,000 shares of common stock which are subject to repurchase.

 (9) Includes 50,000 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000.

(10) Includes 1,206,364 shares of common stock issuable upon exercise of
     immediately exercisable options within 60 days of February 29, 2000. Also
     includes 35,790 shares which are subject to repurchase.

                                       60
<PAGE>   66

                          DESCRIPTION OF CAPITAL STOCK

     At the closing of this offering, we will be authorized to issue 80,000,000
shares of common stock, $0.01 par value, and 5,000,000 shares of undesignated
preferred stock, $0.01 par value, following the conversion of our existing
preferred stock. The following description of capital stock gives effect to the
amended and restated certificate of incorporation to be filed prior to the
closing of this offering. Immediately following the completion of this offering,
and assuming no exercise of the underwriters' over-allotment option, a total of
22,300,417 shares of common stock will be issued and outstanding, and no shares
of preferred stock will be issued and outstanding. As of January 31, 2000, there
were 88 stockholders.

     The following description of our capital stock is subject to and qualified
by our amended and restated certificate of incorporation and bylaws, which are
included as exhibits to the registration statement of which this prospectus
forms a part, and by the provisions of the applicable Delaware law.

COMMON STOCK

     The holders of our common stock are entitled to one vote per share on all
matters to be voted upon by our stockholders. Subject to preferences that may
apply to any outstanding preferred stock that we may issue, the holders of
common stock are entitled to receive ratably those dividends, if any, as may be
declared from time to time by the board of directors out of funds legally
available for dividends. See "Dividend Policy." In the event of our liquidation,
dissolution or winding up, the holders of our common stock are entitled to share
ratably in all assets remaining after payment of liabilities, subject to prior
distribution rights of preferred stock, if any, then outstanding. Our common
stock has no preemptive or conversion rights or other subscription rights. There
are no redemption or sinking fund provisions applicable to the common stock. All
outstanding shares of common stock are fully paid and nonassessable, and the
shares of common stock outstanding upon completion of this offering will be
fully paid and nonassessable.

PREFERRED STOCK

     Our board of directors is authorized to issue, from time-to-time, without
stockholder authorization, in one or more designated series, any or all of our
authorized but unissued shares of preferred stock with any dividend, redemption,
conversion and exchange provisions as may be provided in the particular series.
Any series of preferred stock may possess voting, dividend, liquidation and
redemption rights superior to those of the common stock.

     The rights of the holders of our common stock will be subject to, and may
be adversely affected by, the rights of the holders of any preferred stock that
may be issued in the future. Issuance of a new series of preferred stock, while
providing desirable flexibility in connection with financing possible
acquisitions and other corporate purposes, could have the effect of entrenching
our board of directors and making it more difficult for a third-party to
acquire, or discourage a third-party from acquiring, a majority of our
outstanding voting stock. We have no present plans to issue any shares of or
designate any series of preferred stock.

WARRANTS

     At December 31, 1999, there were warrants outstanding to purchase a total
of 259,962 shares of our common stock, all of which will remain outstanding
after the completion of this offering and have various expiration dates. Some of
these warrants have net exercise provisions under which the holder may, in lieu
of payment of the exercise price in cash, surrender the warrant and receive a
net amount of shares based on the fair market value of our common stock at the
time of exercise of the warrant after deduction of the total exercise price.

                                       61
<PAGE>   67

REGISTRATION RIGHTS

     Pursuant to the Amended and Restated Investors Rights Agreement dated
January 20, 2000, some of our current stockholders and warrantholders have
registration rights for 5,697,948 shares of common stock held by them, or
issuable upon exercise of their warrants. Six months after the effective date of
this offering, the stockholders may demand that we file a registration statement
under the Securities Act covering all or a portion of the investors' registrable
securities. The stockholders demanding a registration must hold at least 40% of
the then outstanding registrable securities with an aggregate offering price,
net of underwriting discounts and commissions, of at least $7.5 million. These
registration rights are subject to our right to delay the filing of a
registration statement for a period not to exceed 120 days after receiving the
registration demand, although we cannot delay more than once in a twelve-month
period. In addition, the managing underwriter, if any, of the offering has the
right to limit the number of the registrable securities proposed to be included
in the registration. We are only obligated to effect one such demand
registration. However, stockholders with registration rights may require us to
file additional registration statements on Form S-3, subject to conditions and
limitations.

     These stockholders also have "piggyback" registration rights. Subject to
exceptions, if we propose to register our securities under the Securities Act
other than pursuant to the stockholders' demand registration rights noted above,
the stockholders may require us to include all or a portion of their registrable
securities in the registration. Again, the managing underwriter has the right to
limit the number of the registrable securities proposed to be included in the
registration.

     We will bear all registration expenses incurred in connection with a
registration effected pursuant to the rights described in the two foregoing
paragraphs, though limited to two registrations on Form S-3. The expenses for
all subsequent registrations on Form S-3 will be paid by the selling
stockholders pro rata in proportion to the number of securities sold. In any
registration, each selling stockholder will pay all underwriting discounts and
selling commissions applicable to the sale of its registrable securities.

     These registration rights terminate on the earlier of two years after the
close of this offering or the date that all of its registrable securities may be
sold during any 90-day period under Rule 144 of the Securities Act. The
registration rights of each investor will also terminate when it owns less than
1% of our common stock.

ANTITAKEOVER EFFECTS OF PROVISIONS OF THE DELAWARE LAW AND FUTURE ISSUANCE OF
PREFERRED STOCK

     We are subject to Section 203 of the Delaware General Corporation Law, an
anti-takeover law. In general, Section 203 prohibits a Delaware corporation from
engaging in any business combination with any interested stockholder for a
period of three years following the date that the stockholder became an
interested stockholder, unless:

     - prior to that date, the board of directors of the corporation approved
       either the business combination or the transaction that resulted in the
       stockholder becoming an interested stockholder;

     - upon consummation of the transaction that resulted in the stockholder
       becoming an interested stockholder, the interested stockholder owned at
       least 85% of our voting stock outstanding at the time the transaction
       commenced, excluding for purposes of determining the number of shares
       outstanding those shares owned by:

      (i)  persons who are directors and also officers; and

      (ii) employee stock plans in which employee participants do not have the
           right to determine confidentially whether shares held subject to 2000
           Employee Stock Purchase Plan will be tendered in a tender or exchange
           offer; or

                                       62
<PAGE>   68

     - on or subsequent to that date, the business combination is approved by
       the board of directors of the corporation and authorized at an annual or
       special meeting of stockholders, and not by written consent, by the
       affirmative vote of at least 66 2/3% of the outstanding voting stock that
       is not owned by the interested stockholder.

     Section 203 defines "business combination" to include the following:

     - any merger or consolidation involving the corporation and the interested
       stockholder;

     - any sale, transfer, pledge or other disposition of 10% or more of the
       assets of the corporation involving the interested stockholder;

     - subject to some exceptions, any transaction that results in the issuance
       or transfer by the corporation of any stock of the corporation to the
       interested stockholder;

     - any transaction involving the corporation that has the effect of
       increasing the proportionate share of the stock of any class or series of
       the corporation beneficially owned by the interested stockholder; or

     - the receipt by the interested stockholder of the benefit of any loans,
       advances, guarantees, pledges or other financial benefits provided by or
       through the corporation.

     In general, Section 203 defines an interested stockholder as any entity or
person beneficially owning 15% or more of the outstanding voting stock of the
corporation and any entity or person affiliated with or controlling or
controlled by any of these entities or persons.

     Our amended and restated certificate of incorporation:

     - provides that any action required or permitted to be taken by our
       stockholders must be effected at a duly called annual or special meeting
       of stockholders and not by written consent;

     - provides that the authorized number of directors may be changed only by
       our board of directors; and

     - authorizes our board of directors to issue blank check preferred stock to
       increase the amount of outstanding shares.

     Our amended and restated by-laws provide that candidates for director may
be nominated, and proposals for business to be considered by the stockholders at
an annual meeting may be made, only by our board of directors or by a
stockholder who gives us written notice no later than 90 days or no earlier than
120 days prior to the first anniversary of the date of the preceding year's
annual meeting, subject to certain adjustments.

     Delaware law and the foregoing provisions of our amended and restated
certificate of incorporation and by-laws and the issuance of preferred stock in
certain circumstances may have the effect of deterring hostile takeovers or
delaying changes in control of our management, which could depress the market
price of our common stock.

TRANSFER AGENT AND REGISTRAR

     Our transfer agent and registrar for our common stock is Equiserve L.P. Its
telephone number is (781) 575-2469.

                                       63
<PAGE>   69

                        SHARES ELIGIBLE FOR FUTURE SALE

     Prior to the offering, there has been no public market for our common
stock. Future sales of substantial amounts of our common stock in the public
market could reduce prevailing market prices. Furthermore, since no shares will
be available for sale shortly after this offering because of contractual and
legal restrictions on resale as described below, sales of substantial amounts of
our common stock in the public market after these restrictions lapse could
adversely affect the prevailing market price and our ability to raise equity
capital in the future.


     Upon completion of this offering, we will have outstanding an aggregate of
22,300,417 shares of common stock, assuming no exercise of the underwriters'
over-allotment option and no exercise of outstanding options or warrants issued
after December 31, 1999. Of these shares, all of the shares sold in this
offering will be freely tradable without restriction or further registration
under the Securities Act, unless these shares are purchased by affiliates. The
remaining 17,300,417 shares of common stock held by existing stockholders are
restricted securities. Restricted securities may be sold in the public market
only if registered for resale or if they qualify for an exemption from
registration described below under Rules 144, 144(k) or 701 promulgated under
the Securities Act.


     Pursuant to the contractual restrictions described below and the provisions
of Rules 144, 144(k) and 701, the restricted shares will be available for sale
in the public market as follows:

     - unless held by affiliates, the 5,000,000 shares sold in the public
       offering will be freely tradable upon completion of this offering;

     - no shares will be eligible for sale beginning 90 days after the date of
       this prospectus;

     - 14,255,790 shares will be eligible for sale upon the expiration of the
       lock-up agreements, described below, beginning 180 days after the date of
       this prospectus.

     Lock-Up Agreements. All of our executive officers and directors, and
stockholders holding an aggregate of at least 90% of the shares of our capital
stock, have agreed under lock-up agreements that, without the prior written
consent of Lehman Brothers Inc., they will not, directly or indirectly, offer,
sell or otherwise dispose of any shares of common stock or any securities which
may be converted into or exchanged for any such shares for the period ending 180
days after the date of this prospectus. Transfers or dispositions can be made
sooner only with the prior written consent of Lehman Brothers Inc. See
"Underwriting".

     Rule 144. In general, under Rule 144 as currently in effect, beginning 90
days after the date of this prospectus a person or persons whose shares are
aggregated, who has beneficially owned restricted securities for at least one
year, including the holding period of any prior owner except an affiliate, would
be entitled to sell within any three-month period a number of shares that does
not exceed the greater of:

     - 1% of the number of shares of our common stock then outstanding, which
       will equal approximately 223,001 shares immediately after the offering;
       or

     - the average weekly trading volume of our common stock on the Nasdaq
       National Market during the four calendar weeks preceding the filing of a
       notice on Form 144 with respect to the sale.

     Sales under Rule 144 are also subject to manner of sale provisions and
notice requirements and to the availability of current public information about
Sangamo.

     Rule 144(k). Under Rule 144(k), a person who is not deemed to have been one
of our affiliates at any time during the 90 days preceding a sale, and who has
beneficially owned the shares proposed to be sold for at least two years,
including the holding period of any prior owner except an

                                       64
<PAGE>   70

affiliate, is entitled to sell these shares without complying with the manner of
sale, public information, volume limitation or notice provisions of Rule 144.
14,255,790 shares of our common stock will qualify as "144(k) shares" within 180
days after the date of this prospectus.

     Rule 701. In general, under Rule 701 of the Securities Act as currently in
effect, any of our employees, consultants or advisors, other than affiliates,
who purchase or receive shares from us in connection with a compensatory stock
purchase plan or option plan or other written agreement will be eligible to
resell their shares beginning 90 days after the date of this prospectus, subject
only to the manner of sale provisions of Rule 144, and by affiliates under Rule
144 without compliance with its holding period requirements.

     Registration Rights. Upon completion of this offering, the holders of
15,035,896 shares of our common stock, or their transferees, will be entitled to
rights with respect to the registration of their shares for resale under the
Securities Act. Registration of their shares for resale under the Securities Act
would result in these shares becoming freely tradable without restriction under
the Securities Act, except for shares purchased by affiliates, immediately upon
the effectiveness of that registration statement.

     Stock Options. Following the offerings, we intend to file a registration
statement on Form S-8 under the Securities Act covering the shares of common
stock reserved for issuance under our 1995 Stock Option Plan, 2000 Stock
Incentive Plan and 2000 Employee Stock Purchase Plan that will become effective
upon filing. Accordingly, shares registered under that registration statement
will, subject to Rule 144 volume limitations applicable to affiliates, be
available for sale in the open market after the filing, except those shares
subject to lockup agreements and unvested shares.

                                       65
<PAGE>   71

                                  UNDERWRITING

     Under the underwriting agreement, which is filed as an exhibit to the
registration statement relating to this prospectus, the underwriters named
below, for whom Lehman Brothers Inc., Chase Securities Inc., ING Barings LLC,
William Blair & Company, L.L.C. and Fidelity Capital Markets, a division of
National Financial Services Corporation, are acting as representatives, have
each agreed to purchase from us the respective number of shares of common stock
shown opposite its name below:

<TABLE>
<CAPTION>
                                                              NUMBER OF
                        UNDERWRITER                            SHARES
                        -----------                           ---------
<S>                                                           <C>
Lehman Brothers Inc.........................................
Chase Securities Inc........................................
ING Barings LLC.............................................
William Blair & Company, L.L.C..............................
Fidelity Capital Markets, a division of National Financial
  Services Corporation......................................

                                                              ---------
  Total.....................................................  5,000,000
                                                              =========
</TABLE>

     The underwriting agreement provides that the underwriters' obligations to
purchase shares of common stock depend on the satisfaction of the conditions
contained in the underwriting agreement. It also provides that, if any of the
shares of common stock are purchased by the underwriters under the underwriting
agreement, all of the shares of common stock that the underwriters have agreed
to purchase under the underwriting agreement, must be purchased. The conditions
contained in the underwriting agreement include the requirement that:

     - the representations and warranties made by us to the underwriters are
       true;

     - that there is no material change in the financial markets; and

     - we deliver to the underwriters customary closing documents.

     The representatives have advised us that the underwriters propose to offer
the shares of common stock directly to the public at the public offering price
set forth on the cover page of this prospectus, and to dealers, who may include
the underwriters, at this public offering price less a selling concession not in
excess of $     per share. The underwriters may allow, and the dealers may
reallow, a concession not in excess of $     per share to brokers and dealers.
After completion of the offering, the underwriters may change the offering price
and other selling terms.

     We have granted the underwriters an option to purchase up to 750,000
additional shares of common stock, exercisable solely to cover over-allotments,
if any, at the public offering price less the underwriting discount shown on the
cover page of this prospectus. The underwriters may exercise this option at any
time until 30 days after the date of the underwriting agreement. If this option
is exercised, each underwriter will be committed, so long as the conditions of
the underwriting agreement are satisfied, to purchase a number of additional
shares of common stock proportionate to the underwriter's initial commitment as
indicated in the table above, and we will be obligated, under the over-allotment
option, to sell the shares of common stock to the underwriters.

     We have agreed not to, without the prior consent of Lehman Brothers Inc.,
directly or indirectly, offer, sell or otherwise dispose of any shares of common
stock or any securities which may be

                                       66
<PAGE>   72

converted into or exchanged for any such shares of common stock for a period of
180 days from the date of this prospectus. All of our executive officers and
directors, and some of our stockholders holding an aggregate of at least 90% of
the shares of our capital stock, have agreed under lock-up agreements that,
without the prior written consent of Lehman Brothers Inc., they will not,
directly or indirectly, offer, sell or otherwise dispose of any shares of common
stock or any securities which may be converted into or exchanged for any such
shares for the period ending 180 days after the date of this prospectus. See
"Shares Eligible for Future Sale."

     The underwriting discount is equal to the public offering price per share
of common stock less the amount paid by the Underwriters to us per share of
common stock. The underwriting discount is expected to be approximately 7% of
the public offering price. We have agreed to pay the underwriters the following
total amount, assuming either no exercise or full exercise by the underwriters
of their over-allotment option:

<TABLE>
<CAPTION>
                                                                      TOTAL FEES
                                                        ---------------------------------------
                                               FEE      WITHOUT EXERCISE     WITH FULL EXERCISE
                                               PER      OF OVER-ALLOTMENT    OF OVER-ALLOTMENT
                                              SHARE          OPTION               OPTIONS
                                              ------    -----------------    ------------------
<S>                                           <C>       <C>                  <C>
Underwriting discount paid by Sangamo.......  $         $                    $
</TABLE>

     In addition, we estimate that our share of the total expenses of this
offering, excluding the underwriting discount, will be approximately $1.2
million.

     Before this offering, there has been no public market for the shares of
common stock. The initial public offering price will be negotiated between the
representatives and us. In determining the initial public offering price of the
common stock, the representatives will consider, among other things and in
addition to prevailing market conditions:

     - our historical performance and capital structure;

     - estimates of our business potential and earning prospects;

     - an overall assessment of our management; and

     - the consideration of the above factors in relation to market valuations
       of companies in related businesses.

     We intend to apply to have our common stock approved for quotation on the
Nasdaq National Market under the symbol "SGMO."

     We have agreed to indemnify the underwriters against liabilities, including
liabilities under the Securities Act and liabilities arising from breaches of
the representations and warranties contained in the underwriting agreement, and
to contribute to payments that the underwriters may be required to make for
these liabilities.

     Until the distribution of the common stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the underwriters and
selling group members to bid for and purchase shares of common stock. As an
exception to these rules, the representatives are permitted to engage in
transactions that stabilize the price of the common stock. These transactions
may consist of bids or purchases for the purposes of pegging, fixing or
maintaining the price of the common stock.

     The underwriters may create a short position in the common stock in
connection with the offering, which means that they may sell more shares than
are set forth on the cover page of this prospectus. If the underwriters create a
short position, then the representatives may reduce that short position by
purchasing common stock in the open market. The representatives also may elect
to reduce any short position by exercising all or part of the over-allotment
option. The underwriters have

                                       67
<PAGE>   73

informed us that they do not intend to confirm sales to discretionary accounts
that exceed 5% of the total number of shares of common stock offered by them.

     The representatives also may impose a penalty bid on underwriters and
selling group members. This means that, if the representatives purchase shares
of common stock in the open market to reduce the underwriters' short position or
to stabilize the price of the common stock, they may reclaim the amount of the
selling concession from the underwriters and selling group members who sold
those shares as part of the offering.

     In general, purchases of a security for the purpose of stabilization or to
reduce a syndicate short position could cause the price of the security to be
higher than it might otherwise be in the absence of these purchases. The
imposition of a penalty bid might have an effect on the price of a security to
the extent that it may discourage resales of the security by purchasers in an
offering.

     Neither we nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the common stock. In addition, neither
we nor any of the underwriters makes any representation that the representatives
will engage in these transactions or that these transactions, once commenced,
will not be discontinued without notice.

     Any offers in Canada will be made only under an exemption from the
requirements to file a prospectus in the relevant province of Canada in which
the sale is made.

     Purchasers of the shares of common stock offered in this prospectus may be
required to pay stamp taxes and other charges under the laws and practices of
the country of purchase, in addition to the offering price listed on the cover
of this prospectus.

     Fidelity Capital Markets, a division of National Financial Services
Corporation, is acting as a selling group member in this offering and will be
facilitating electronic distribution of information through the Internet,
intranet and other proprietary electronic technology.

     At our request, the underwriters have reserved up to 300,000 shares of the
common stock offered by this prospectus for sale to our officers, directors,
employees and their family members and to our business associates at the initial
public offering price set forth on the cover page of this prospectus. These
persons must commit to purchase no later than the close of business on the day
following the date of this prospectus. The number of shares available for sale
to the general public will be reduced to the extent these persons purchase the
reserved shares.

     Lehman Brothers Inc. and one of its affiliates are stockholders of Sangamo.
Together they own an aggregate of less than one percent of the issued and
outstanding shares of our common stock. In addition, we have entered into a
consulting agreement with an affiliate of Lehman Brothers Inc. that provides for
annual payments to the affiliate of $20,000.

                                 LEGAL MATTERS

     The validity of the common stock offered will be passed upon for us by
Brobeck, Phleger & Harrison LLP, San Francisco, California. John W. Larson, one
of our directors, is a senior partner of Brobeck, Phleger & Harrison LLP and
beneficially owns an aggregate of 474,460 shares of our common stock. Latham &
Watkins is acting as counsel for the underwriters in connection with selected
legal matters relating to the shares of common stock offered by this prospectus.

                                       68
<PAGE>   74

                                    EXPERTS

     Ernst & Young LLP, independent auditors, have audited our financial
statements at December 31, 1998 and 1999, and for each of the three years in the
period ended December 31, 1999, as set forth in their report. We have included
our financial statements in this prospectus and elsewhere in the registration
statement in reliance on Ernst & Young LLP's report, given on the authority of
such firm as experts in accounting and auditing.

     The statements in this prospectus in the sections entitled "Risk
Factors -- Because it is difficult and costly to protect our proprietary rights,
and third parties have filed patent applications that are similar to ours, we
cannot ensure the proprietary protection of our technologies and products" and
"Business -- Intellectual Property and Technology Licenses" have been passed
upon, as to patent matters, by Townsend and Townsend and Crew LLP, patent
counsel to us, and experts on such matters, and are included in this prospectus
in reliance upon its review and approval.

                   WHERE YOU CAN FIND ADDITIONAL INFORMATION

     We have filed with the Securities and Exchange Commission, Washington, D.C.
20549, under the Securities Act a registration statement on Form S-1 relating to
the common stock offered by this prospectus. This prospectus does not contain
all of the information set forth in the registration statement and its exhibits
and schedules. For further information with respect to us and the shares we are
offering by this prospectus, you should refer to the registration statement and
its exhibits and schedules. Statements contained in this prospectus as to the
contents of any contract, agreement or other document referred to are not
necessarily complete, and you should refer to the copy of that contract or other
document filed as an exhibit to the registration statement. You may read or
obtain a copy of the registration statement, including exhibits, at the
commission's public reference room at 450 Fifth Street, N.W., Washington, D.C.
20549. Each statement in this prospectus relating to a contract or document
filed as an exhibit is qualified in all respects by the filed exhibit. You may
obtain information on the operation of the public reference room by calling the
commission at 1-800-SEC-0330. The commission maintains a Web site that contains
reports, proxy information statements and other information regarding
registrants that file electronically with the commission. The address of this
Web site is http://www.sec.gov.

     As a result of the offering, the information and reporting requirements of
the Securities Exchange Act of 1934 will apply to us. We intend to furnish
holders of our common stock with annual reports containing, among other
information, audited financial statements certified by an independent public
accounting firm and quarterly reports containing unaudited condensed financial
information for the first three quarters of each fiscal year. We intend to
furnish other reports as we may determine or as may be required by law.

                                       69
<PAGE>   75

                           SANGAMO BIOSCIENCES, INC.

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Ernst & Young LLP, Independent Auditors...........  F-2
Balance Sheets..............................................  F-3
Statements of Operations....................................  F-4
Statement of Stockholders' Equity...........................  F-5
Statements of Cash Flows....................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>

                                       F-1
<PAGE>   76

               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders
Sangamo BioSciences, Inc.

     We have audited the accompanying balance sheets of Sangamo BioSciences,
Inc. as of December 31, 1998 and 1999, and the related statements of operations,
stockholders' equity, and cash flows for each of the three years in the period
ended December 31, 1999. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

     We conducted our audits in accordance with auditing standards generally
accepted in the United States. Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements. An
audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Sangamo BioSciences, Inc. at
December 31, 1998 and 1999, and the results of its operations and its cash flows
for each of the three years in the period ended December 31, 1999, in conformity
with accounting principles generally accepted in the United States.

                                          Ernst & Young LLP

Palo Alto, California
January 28, 2000,
except for Note 7, as to which the date is

March 28, 2000.




                                       F-2
<PAGE>   77

                           SANGAMO BIOSCIENCES, INC.

                                 BALANCE SHEETS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)


<TABLE>
<CAPTION>
                                                                                PRO FORMA
                                                                              STOCKHOLDERS'
                                                           DECEMBER 31,          EQUITY
                                                        ------------------    DECEMBER 31,
                                                         1998       1999          1999
                                                        -------    -------    -------------
                                                                               (UNAUDITED)
<S>                                                     <C>        <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................  $ 1,250    $   251
  Short-term investments..............................    1,808      7,252
  Accounts receivable.................................      384        562
  Prepaid expenses....................................       97        171
                                                        -------    -------
     Total current assets.............................    3,539      8,236
Property and equipment, net...........................      436        612
Other assets..........................................       57        314
                                                        -------    -------
     Total assets.....................................  $ 4,032    $ 9,162
                                                        =======    =======
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued liabilities............  $   182    $   348
  Accrued compensation and employee benefits..........      196        182
  Deferred revenue....................................       --        500
                                                        -------    -------
     Total current liabilities........................      378      1,030
Note payable..........................................      250        250
Commitments
Stockholders' equity:
  Convertible preferred stock, $0.01 par value;
     6,000,000 shares authorized, issuable in series,
     3,148,000 and 4,855,917 shares issued and
     outstanding at December 31, 1998 and 1999,
     respectively (none pro forma); aggregate
     liquidation preference of $15,485 at December 31,
     1999, at amount paid in..........................    7,743     15,187       $    --
  Common stock, $0.01 par value; 15,000,000 shares
     authorized, 5,931,018 and 6,132,060 shares issued
     and outstanding at December 31, 1998 and 1999,
     respectively, at amount paid-in (15,843,894
     shares issued and outstanding, pro forma), at
     amount paid in...................................    1,576      3,258        18,445
  Note receivable from stockholder....................     (187)      (125)         (125)
  Deferred stock compensation.........................     (773)    (1,736)       (1,736)
  Accumulated deficit.................................   (5,010)    (8,785)       (8,785)
  Accumulated other comprehensive income..............       55         83            83
                                                        -------    -------       -------
     Total stockholders' equity.......................    3,404      7,882       $ 7,882
                                                        -------    -------       =======
     Total liabilities and stockholders' equity.......  $ 4,032    $ 9,162
                                                        =======    =======
</TABLE>


See accompanying notes.
                                       F-3
<PAGE>   78

                           SANGAMO BIOSCIENCES, INC.

                            STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31,
                                                            -----------------------------
                                                             1997       1998       1999
                                                            -------    -------    -------
<S>                                                         <C>        <C>        <C>
Revenues:
  Federal government research grants......................  $ 1,152    $ 1,888    $ 1,182
  Collaboration agreements................................       --        150      1,000
                                                            -------    -------    -------
     Total revenues.......................................    1,152      2,038      2,182
Operating expenses:
  Research and development (including charges for stock
     compensation of $25, $202, and $275 for 1997, 1998
     and 1999, respectively)..............................    1,700      4,259      4,266
  General and administrative (including charges for stock
     compensation of $352, $208, and $244 for 1997, 1998
     and 1999, respectively)..............................      797      1,237      1,822
                                                            -------    -------    -------
     Total operating expenses.............................    2,497      5,496      6,088
                                                            -------    -------    -------
     Loss from operations.................................   (1,345)    (3,458)    (3,906)
Interest income...........................................       44        185        148
Interest expense..........................................      (99)       (12)       (17)
                                                            -------    -------    -------
Net loss..................................................  $(1,400)   $(3,285)   $(3,775)
                                                            =======    =======    =======
Basic and diluted net loss per share......................  $ (0.26)   $ (0.56)   $ (0.63)
                                                            =======    =======    =======
Shares used in computing basic and diluted net loss per
  share...................................................    5,485      5,843      5,991
                                                            =======    =======    =======
Pro forma basic and diluted net loss per share
  (unaudited).............................................                        $ (0.29)
                                                                                  =======
Shares used in computing pro forma basic and diluted net
  loss per share (unaudited)..............................                         13,102
                                                                                  =======
</TABLE>

See accompanying notes.

                                       F-4
<PAGE>   79

                           SANGAMO BIOSCIENCES, INC.

                       STATEMENT OF STOCKHOLDERS' EQUITY
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                    CONVERTIBLE
                                                     PREFERRED                                NOTE
                                                       STOCK             COMMON STOCK      RECEIVABLE      DEFERRED
                                                -------------------   ------------------      FROM          STOCK       ACCUMULATED
                                                 SHARES     AMOUNT     SHARES     AMOUNT   STOCKHOLDER   COMPENSATION     DEFICIT
                                                ---------   -------   ---------   ------   -----------   ------------   -----------
<S>                                             <C>         <C>       <C>         <C>      <C>           <C>            <C>
Balances at December 31, 1996.................    750,000   $   750   5,472,500   $   9       $  --        $    --        $  (325)
 Issuance of common stock for services
   rendered at $0.01 per share................         --        --     303,800     331          --             --             --
 Issuance of common stock upon exercise of
   options at $0.05 per
   share......................................         --        --     100,000       5          --             --             --
 Issuance of Series B convertible preferred
   stock for cash at $3.00 per share, net of
   issuance costs of $180.....................  2,358,000     6,894          --      --          --             --             --
 Issuance of Series B preferred stock
   warrants...................................         --        99          --      --          --             --             --
 Deferred stock compensation..................         --        --          --     449          --           (449)            --
 Amortization of deferred stock
   compensation...............................         --        --          --      --          --             46             --
 Net loss and comprehensive loss..............         --        --          --      --          --             --         (1,400)
                                                ---------   -------   ---------   ------      -----        -------        -------
Balances at December 31, 1997.................  3,108,000     7,743   5,876,300     794          --           (403)        (1,725)
 Issuance of common stock upon exercise of
   options at $0.01 and $0.05 per share, net
   of repurchases.............................         --        --      54,718       2          --             --             --
 Issuance of Series B convertible preferred
   stock for services related to the issuance
   of preferred stock at $0.01 per share......     40,000        --          --      --          --             --             --
 Issuance of note receivable to stockholder...         --        --          --      --        (250)            --             --
 Forgiveness of note receivable to
   stockholder................................         --        --          --      --          63             --             --
 Deferred stock compensation..................         --        --          --     780          --           (780)            --
 Amortization of deferred stock
   compensation...............................         --        --          --      --          --            410             --
 Unrealized gain on investments...............         --        --          --      --          --             --             --
 Net loss.....................................         --        --          --      --          --             --         (3,285)
 Comprehensive loss...........................
                                                ---------   -------   ---------   ------      -----        -------        -------
Balances at December 31, 1998.................  3,148,000     7,743   5,931,018   1,576        (187)          (773)        (5,010)
 Issuance of common stock upon exercise of
   options at $0.01 to $0.15 per share........         --        --     191,042      12          --             --             --
 Issuance of common stock and options to
   purchase common stock for services
   rendered...................................         --        --      10,000     188          --             --             --
 Issuance of Series A convertible preferred
   stock upon exercise of warrants at $0.01
   per share..................................     41,250        --          --      --          --             --             --
 Issuance of Series C convertible preferred
   stock for cash at $4.50 per share, net of
   issuance costs of $56......................  1,666,667     7,444          --      --          --             --             --
 Forgiveness of note receivable to
   stockholder................................         --        --          --      --          62             --             --
 Deferred stock compensation..................         --        --          --   1,482          --         (1,482)            --
 Amortization of deferred stock
   compensation...............................         --        --          --      --          --            519             --
 Unrealized gain on investments...............         --        --          --      --          --             --             --
 Net loss.....................................         --        --          --      --          --             --         (3,775)
 Comprehensive loss...........................
                                                ---------   -------   ---------   ------      -----        -------        -------
Balances at December 31, 1999.................  4,855,917   $15,187   6,132,060   $3,258      $(125)       $(1,736)       $(8,785)
                                                =========   =======   =========   ======      =====        =======        =======

<CAPTION>

                                                 ACCUMULATED
                                                    OTHER           TOTAL
                                                COMPREHENSIVE   STOCKHOLDERS'
                                                   INCOME          EQUITY
                                                -------------   -------------
<S>                                             <C>             <C>
Balances at December 31, 1996.................       $--           $   434
 Issuance of common stock for services
   rendered at $0.01 per share................        --               331
 Issuance of common stock upon exercise of
   options at $0.05 per
   share......................................        --                 5
 Issuance of Series B convertible preferred
   stock for cash at $3.00 per share, net of
   issuance costs of $180.....................        --             6,894
 Issuance of Series B preferred stock
   warrants...................................        --                99
 Deferred stock compensation..................        --                --
 Amortization of deferred stock
   compensation...............................        --                46
 Net loss and comprehensive loss..............        --            (1,400)
                                                     ---           -------
Balances at December 31, 1997.................        --             6,409
 Issuance of common stock upon exercise of
   options at $0.01 and $0.05 per share, net
   of repurchases.............................        --                 2
 Issuance of Series B convertible preferred
   stock for services related to the issuance
   of preferred stock at $0.01 per share......        --                --
 Issuance of note receivable to stockholder...        --                --
 Forgiveness of note receivable to
   stockholder................................        --                --
 Deferred stock compensation..................        --                --
 Amortization of deferred stock
   compensation...............................        --               410
 Unrealized gain on investments...............        55                55
 Net loss.....................................        --            (3,285)
                                                                   -------
 Comprehensive loss...........................                      (3,230)
                                                     ---           -------
Balances at December 31, 1998.................        55             3,591
 Issuance of common stock upon exercise of
   options at $0.01 to $0.15 per share........        --                12
 Issuance of common stock and options to
   purchase common stock for services
   rendered...................................        --               188
 Issuance of Series A convertible preferred
   stock upon exercise of warrants at $0.01
   per share..................................        --                --
 Issuance of Series C convertible preferred
   stock for cash at $4.50 per share, net of
   issuance costs of $56......................        --             7,444
 Forgiveness of note receivable to
   stockholder................................        --                --
 Deferred stock compensation..................        --                --
 Amortization of deferred stock
   compensation...............................        --               519
 Unrealized gain on investments...............        28                28
 Net loss.....................................        --            (3,775)
                                                                   -------
 Comprehensive loss...........................                      (3,747)
                                                     ---           -------
Balances at December 31, 1999.................       $83           $ 8,007
                                                     ===           =======
</TABLE>


See accompanying notes.

                                       F-5
<PAGE>   80

                           SANGAMO BIOSCIENCES, INC.

                            STATEMENTS OF CASH FLOWS
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,
                                                             -----------------------------
                                                              1997       1998       1999
                                                             -------    -------    -------
<S>                                                          <C>        <C>        <C>
OPERATING ACTIVITIES:
  Net loss.................................................  $(1,400)   $(3,285)   $(3,775)
  Adjustments to reconcile net loss to net cash used in
     operating activities:
     Depreciation and amortization.........................        2         86        164
     Amortization of deferred stock compensation...........       46        410        519
     Issuance of common stock and options to purchase
       common stock for technology and services rendered...      331         --        188
     Non-cash interest expense.............................       99         --         --
     Changes in operating assets and liabilities:
       Accounts receivable.................................     (226)        20       (178)
       Prepaid expenses and other assets...................      (53)      (284)       (14)
       Accounts payable and accrued liabilities............      383       (305)       166
       Accrued compensation and employee benefits..........       --        196        (14)
       Deferred revenue....................................       --         --        500
                                                             -------    -------    -------
          Net cash used in operating activities............     (818)    (3,162)    (2,444)
INVESTING ACTIVITIES:
Purchases of short-term investments........................       --     (2,921)    (8,242)
Maturities to and other changes in short-term
  investments..............................................       --      1,166      2,571
Purchases of property and equipment........................     (124)      (400)      (340)
                                                             -------    -------    -------
          Net cash used in investing activities............     (124)    (2,155)    (6,011)
FINANCING ACTIVITIES:
Proceeds from issuance of convertible preferred stock......    5,934         --      7,444
Proceeds from issuance of common stock.....................        5          3         12
Borrowings under note payable..............................       --        250         --
Proceeds from issuance of convertible promissory notes.....      960         --         --
                                                             -------    -------    -------
          Net cash provided by financing activities........    6,899        253      7,456
                                                             -------    -------    -------
          Net increase in cash and cash equivalents........    5,957     (5,064)      (999)
Cash and cash equivalents, beginning of period.............      357      6,314      1,250
                                                             -------    -------    -------
Cash and cash equivalents, end of period...................  $ 6,314    $ 1,250    $   251
                                                             =======    =======    =======
SUPPLEMENTAL DISCLOSURES:
Cash paid for interest.....................................  $    --    $    12    $    17
                                                             =======    =======    =======
NONCASH INVESTING AND FINANCING ACTIVITIES:
Deferred compensation related to stock options.............  $   449    $   780    $ 1,482
                                                             =======    =======    =======
Conversion of convertible promissory notes to convertible
  preferred stock..........................................  $   960    $    --    $    --
                                                             =======    =======    =======
</TABLE>

See accompanying notes.

                                       F-6
<PAGE>   81

                           SANGAMO BIOSCIENCES, INC.

                         NOTES TO FINANCIAL STATEMENTS

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SANGAMO AND BASIS OF PRESENTATION

     Sangamo BioSciences, Inc. ("Sangamo") was incorporated in the State of
Delaware on June 22, 1995 and is focused on the development and
commercialization of novel transcription factors for the regulation of gene
expression. Sangamo's Universal Gene Recognition technology platform enables the
engineering of a class of transcription factors known as zinc finger DNA binding
proteins ("ZFPs"). Through December 31, 1998, Sangamo was considered to be in
the development stage. During 1999, Sangamo entered into several Universal
GeneTools collaborations and recognized revenues associated with these
agreements, and expects to continue to receive revenues under these, similar and
other agreements in the future. Consequently, Sangamo is no longer considered to
be in the development stage. Sangamo will require additional financial resources
to complete the development and commercialization of its products.

     Sangamo anticipates working on a number of long-term development projects
that will involve experimental and unproven technology. The projects may require
several years and substantial expenditures to complete and ultimately may be
unsuccessful. Sangamo plans to finance its operations with available cash
resources, funds received under federal government research grants and Universal
GeneTools collaborations and strategic partnerships (see Note 7), and from the
issuance of equity or debt securities. To date, Sangamo has been awarded
research grants from the National Institute of Standards and Technology and the
National Institutes of Health amounting to approximately $5,600,000 of which
approximately $5,000,000 has been used from inception of the Company through
December 31, 1999. Sangamo believes that its available cash, cash equivalents
and short-term investments of $7,503,000 as of December 31, 1999, along with
expected federal government research grant reimbursements and revenues from
Universal GeneTools collaborations and strategic partnerships, will be adequate
to fund its operations through at least fiscal 2000. Sangamo will need to raise
substantial additional capital to fund subsequent operations. Sangamo intends to
seek funding through the issuance of equity securities, including this offering,
through additional Universal GeneTools collaborations, strategic partnerships,
and federal government research grants. Sangamo may seek to raise additional
capital when conditions permit. We cannot assure you that funding will be
available on favorable terms, if at all.

INITIAL PUBLIC OFFERING

     In February 2000, the Board of Directors authorized the management of
Sangamo to file a registration statement with the Securities and Exchange
Commission permitting Sangamo to sell shares of its common stock to the public.
If the initial public offering is closed under the terms presently anticipated,
all of the convertible preferred stock outstanding will automatically convert
into common stock (see Note 7). Unaudited pro forma stockholders' equity, as
adjusted for the assumed conversion of the preferred stock, is set forth on the
balance sheet.

USE OF ESTIMATES

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and the
accompanying notes. Actual results could differ from those estimates.

                                       F-7
<PAGE>   82
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
CASH AND CASH EQUIVALENTS

     Sangamo considers all highly liquid investments purchased with original
maturities of three months or less at the purchase date to be cash equivalents.
Sangamo's cash and cash equivalents are maintained with two financial
institutions. Cash equivalents of $1,236,000 and $249,000 at December 31, 1998
and December 31, 1999, respectively, consist of a certificate of deposit and
deposits in a money market investment account.

SHORT-TERM INVESTMENTS

     Sangamo classifies its short-term investments as "available-for-sale" and
records its investments at market value in accordance with Statement of
Financial Accounting Standards ("SFAS") No. 115, "Accounting for Certain
Investments in Debt and Equity Securities." Available-for-sale securities are
carried at amounts that approximate fair market value based on quoted market
prices. Realized gains and losses and declines in value judged to be
other-than-temporary on available-for-sale securities are included in interest
income. Interest on securities classified as available-for-sale is also included
in interest income. Through December 31, 1999, Sangamo has experienced no losses
on its short-term investments.

     At December 31, 1998 short-term investments consisted of US Treasury bills
and commercial notes with an amortized cost of $1,753,000 and a fair value of
$1,808,000. These investments matured during 1999. At December 31, 1999,
short-term investments consisted of commercial notes and a certificate of
deposit with an unamortized cost of $7,169,000 and fair value of $7,252,000 that
mature at various dates through May 2000.

PROPERTY AND EQUIPMENT

     Property and equipment are stated at cost, less accumulated depreciation
and amortization. Depreciation is calculated using the straight-line method
based on the estimated useful lives of the related assets (generally three to
five years). For leasehold improvements, amortization is calculated using the
straight-line method based on the shorter of the useful life or the lease term.
Sangamo has not internally developed any software for use in its research
activities.


     Through December 31, 1999, the Company has been reimbursed under government
grants for approximately $441,000 of equipment purchased for use in
grant-related research. The cost of such equipment has been charged to expense
in the same periods in which the related grant revenue has been recognized.


COMPREHENSIVE INCOME

     In 1998, Sangamo adopted SFAS No. 130, "Reporting Comprehensive Income,"
which established new rules for the reporting and display of comprehensive
income and its components. Comprehensive income includes all changes in equity
during a period from non-owner sources. These items include unrealized gains and
losses on investments.

                                       F-8
<PAGE>   83
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
REVENUE RECOGNITION

     Sangamo recognizes revenue from its Universal GeneTools agreements as
earned when ZFPs are delivered to the Universal GeneTools collaborators.
Generally, Sangamo receives up-front payments from these collaborations prior to
the delivery of ZFPs and the revenues from these payments are deferred until the
ZFPs are delivered. The risk of ownership has passed to the collaborator and all
performance obligations have been satisfied at the time revenue is recognized.

     Sangamo's federal government research grants provide for the reimbursement
of qualified expenses for research and development as defined under the terms of
the grant agreement. Revenue under grant agreements is recognized when the
related research expenses are incurred. Grant reimbursements are received on a
quarterly or monthly basis and are subject to the issuing agency's right of
audit.

RESEARCH AND DEVELOPMENT COSTS

     Research and development expenses consist of costs incurred for
company-sponsored as well as collaborative research and development activities.
These costs include direct and research-related overhead expenses and are
expensed as incurred.

STOCK-BASED COMPENSATION

     Sangamo accounts for employee and director stock options using the
intrinsic value method in accordance with Accounting Principles Board Opinion
No. 25, "Accounting for Stock Issued to Employees" ("APB 25") and has adopted
the disclosure-only alternative of SFAS No. 123, "Accounting for Stock-Based
Compensation" ("SFAS 123"). Stock options granted to non-employees, including
Scientific Advisory Board Members, are accounted for in accordance with Emerging
Issues Task Force Issue No. 96-18, "Accounting for Equity Instruments That Are
Issued to Other Than Employees for Acquiring or in Conjunction with Selling,
Goods or Services," which requires the value of such options to be remeasured as
they vest over a performance period. The fair value of such options is
determined using the Black-Scholes model.

INCOME TAXES

     Sangamo uses the liability method to account for income taxes as required
by SFAS No. 109, "Accounting for Income Taxes." Under this method, deferred tax
assets and liabilities are determined based on differences between financial
reporting and tax bases of assets and liabilities. Deferred tax assets and
liabilities are measured using enacted tax rates and laws that will be in effect
when the differences are expected to reverse.

NET LOSS PER SHARE

     Basic and diluted net loss per share information for all periods is
presented under the requirements of SFAS No. 128, "Earnings per Share." Basic
net loss per share has been computed using the weighted-average number of shares
of common stock outstanding during the period, less shares subject to
repurchase, and excludes any dilutive effects of options, warrants, and
convertible

                                       F-9
<PAGE>   84
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
securities. Potential dilutive securities have also been excluded from the
computation of diluted net loss per share as their inclusion would be
antidilutive.

     Pro forma net loss per share has been computed as described above and also
gives effect, under Securities and Exchange Commission guidance, to the
conversion of preferred shares not included above that will automatically
convert to common shares upon completion of the Company's initial public
offering, using the if-converted method.

     The following table presents the calculation of historical basic and
diluted net loss per share and pro forma basic and diluted net loss per share
(in thousands, except per share data):

<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31,
                                                            -----------------------------
                                                             1997       1998       1999
                                                            -------    -------    -------
<S>                                                         <C>        <C>        <C>
Historical:
Net loss..................................................  $(1,400)   $(3,285)   $(3,775)
                                                            =======    =======    =======
Basic and diluted:
  Weighted-average shares of common stock outstanding.....    5,519      5,919      6,053
  Less: weighted-average shares subject to repurchase.....      (34)       (76)       (62)
                                                            -------    -------    -------
  Shares used in computing basic and diluted net loss per
     share................................................    5,485      5,843      5,991
                                                            =======    =======    =======
Basic and diluted net loss per share......................  $ (0.26)   $ (0.56)   $ (0.63)
                                                            =======    =======    =======
Pro forma:
Net loss..................................................                        $(3,775)
                                                                                  =======
Weighted-average shares of common stock outstanding (from
  above)..................................................                          5,991
Adjustment to reflect the weighted average effect of the
  assumed conversion of convertible preferred stock from
  the date of issuance
  (unaudited).............................................                          7,111
                                                                                  -------
Shares used in computing pro forma basic and diluted net
  loss per share (unaudited)..............................                         13,102
                                                                                  =======
Pro forma basic and diluted net loss per share
  (unaudited).............................................                        $ (0.29)
                                                                                  =======
</TABLE>

     If Sangamo had reported net income, the calculation of historical and pro
forma diluted earnings per share would have included approximately an additional
122,915, 284,994 and 927,652 common equivalent shares related to outstanding
stock options and warrants not included above (determined using the treasury
stock method) for 1997, 1998 and 1999, respectively.

     SEGMENT REPORTING

     As of January 1, 1998, Sangamo adopted SFAS No. 131, "Disclosure about
Segments of an Enterprise and Related Information." SFAS 131 establishes annual
and interim reporting standards for an enterprise's operating segments and
related disclosures about its products, services, geographic

                                      F-10
<PAGE>   85
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
areas, and major customers. Sangamo has determined that it operates in only one
segment. Accordingly, the adoption of this statement had no impact on its
financial statements.

     MAJOR CUSTOMERS

     During 1999, Sangamo entered into Universal GeneTools agreements with 13
pharmaceutical and biotechnology companies and earned revenue of $1,000,000
under seven of these agreements. At December 31, 1999, Sangamo's accounts
receivable consisted of amounts due from two of these pharmaceutical companies.
These agreements generally require Sangamo to apply its research expertise and
technology to develop unique transcription factors, which are delivered to the
pharmaceutical companies for use in their research.

EFFECT OF NEW ACCOUNTING STANDARDS

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities" ("SFAS 133"), as
amended, which will be effective for fiscal 2001. SFAS 133 establishes
accounting and reporting standards requiring that every derivative instrument,
including derivative instruments imbedded in other contracts, be recorded in the
balance sheet as either an asset or liability measured at its fair value. SFAS
133 also requires that changes in the derivative's fair value be recognized in
earnings unless specific hedge accounting criteria are met. Sangamo believes the
adoption of SFAS 133 will not have a material effect on the financial
statements, since it currently does not hold derivative instruments or engage in
hedging activities.

     In December 1999, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 101, "Revenue Recognition in Financial Statements" ("SAB
101"). SAB 101 summarizes the SEC's views in applying generally accepted
accounting principles to revenue recognition, and specifically addresses revenue
recognition for upfront, non-refundable fees earned in connection with research
collaboration arrangements. It is the SEC's position that such fees should
generally be recognized over the term of the agreement. Sangamo expects to apply
this accounting to its future collaborations. Adoption of SAB 101 will not
impact on the Company's historical revenue recognition policy.

                                      F-11
<PAGE>   86
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2. PROPERTY AND EQUIPMENT

     Property and equipment consist of the following:

<TABLE>
<CAPTION>
                                                               DECEMBER 31,
                                                              ---------------
                                                              1998      1999
                                                              -----    ------
                                                              (IN THOUSANDS)
<S>                                                           <C>      <C>
Laboratory equipment........................................  $137     $ 436
Furniture and fixtures......................................   209       227
Leasehold improvements......................................   178       201
                                                              ----     -----
                                                               524       864
Less accumulated depreciation and amortization..............   (88)     (252)
                                                              ----     -----
                                                              $436     $ 612
                                                              ====     =====
</TABLE>

3. COMMITMENTS AND NOTES PAYABLE

     Sangamo occupies office and laboratory space under operating leases in
Richmond, California that expire in 2004. Rent expense for 1997, 1998 and 1999
was $74,000, $314,000, and $336,000, respectively. Future minimum payments under
non-cancelable operating leases at December 31, 1999 consist of the following:

<TABLE>
<CAPTION>
                                                          AMOUNT
                                                      --------------
                                                      (IN THOUSANDS)
<S>                                                   <C>
2000................................................      $  304
2001................................................         304
2002................................................         306
2003................................................         308
2004................................................         206
                                                          ------
                                                          $1,428
                                                          ======
</TABLE>

     In May 1998, Sangamo entered into a Loan and Security Agreement with a
financial institution that provides for notes payable totaling up to $500,000
for purchases of equipment. Outstanding notes payable bear interest at 6.5% per
annum and interest payments are due monthly. The outstanding balance at December
31, 1998 and 1999 was $250,000. Principal under the notes are due on May 2003.
Included in other assets in the accompanying balance sheets is $250,000 pledged
in the form of a certificate of deposit used to collateralize the notes payable.

                                      F-12
<PAGE>   87
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4. STOCKHOLDERS' EQUITY

CONVERTIBLE PREFERRED STOCK

     Convertible preferred stock consists of the following, by series:

<TABLE>
<CAPTION>
                                                               SHARES ISSUED AND
                                                                  OUTSTANDING
                                                                  DECEMBER 31,
                                                             ----------------------
                                               DESIGNATED      1998         1999
                                               ----------    ---------    ---------
<S>                                            <C>           <C>          <C>
Series
  A..........................................    856,250       750,000      791,250
  B..........................................  2,462,981     2,398,000    2,398,000
  C..........................................  2,000,000            --    1,666,667
                                               ---------     ---------    ---------
                                               5,319,231     3,148,000    4,855,917
                                               =========     =========    =========
</TABLE>

     The holders of Series A, B and C convertible preferred stock are entitled
to receive noncumulative dividends at the rate of 8% per share per year, if
declared, prior to and in preference to the payment of dividends to holders of
common stock. As of December 31, 1999, no dividends had been declared. Holders
of Series A, B and C convertible preferred stock are entitled to a liquidation
preference equal to $1.00, $3.00 and $4.50 per share, respectively, plus all
declared but unpaid dividends. In a liquidation, any assets remaining following
the payment of these amounts would be distributed to common stockholders.

     Convertible preferred stock is convertible into common stock at the option
of the holder, initially at an exchange ratio of one-to-one (see Note 7).
Convertible preferred shares are automatically converted into common stock
immediately upon the closing of an underwritten public offering that is at a
price to the public of at least $6.00 per share and that results in aggregate
proceeds to Sangamo of at least $7,500,000. All convertible preferred shares
have voting rights equal to common stock on an as-if-converted basis.

COMMON STOCK

     At December 31, 1999, 45,500 shares of outstanding common stock were
subject to the Company's contractual right of repurchase at a weighted average
price of $0.05 which rights generally lapse over periods not exceeding four
years.

     In 1997, the Company sold a total of 303,800 shares to a consultant and an
officer for services rendered at $0.01 per share, which was below the fair value
of the Company's stock on the date of grant. As a result, the Company recognized
a charge of $331,000.

WARRANTS

     At December 31, 1999, warrants to purchase 65,000 shares of Series A
convertible preferred stock were outstanding at an exercise price of $1.00 per
share, which are exercisable through September 2000, and warrants to purchase
64,981 shares of Series B convertible preferred stock were outstanding at an
exercise price of $3.00 per share, which are exercisable through August 2002.
The warrants to purchase Series B preferred stock were issued in connection with
a 1997 bridge loan transaction. Such warrants were assigned a value of $99,000
using the Black Scholes method which

                                      F-13
<PAGE>   88
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4. STOCKHOLDERS' EQUITY (CONTINUED)
was charged to interest expense in 1997. The valuation was determined using the
following assumptions: risk free interest rate -- 6%; term -- 5 years, dividend
yield -- 0%; and volatility of the Company's stock -- .5. Sangamo has reserved
both preferred and common stock for issuance upon exercise of the warrants.

STOCK OPTION PLAN

     Sangamo's 1995 Stock Option Plan (the "1995 Option Plan") provides for the
issuance of common stock and grants of options for common stock to employees,
officers, directors and consultants. The exercise price per share will be no
less than 85% of the fair value per share of common stock on the option grant
date, and the option term will not exceed ten years. If the person to whom the
option is granted is a 10% stockholder, then the exercise price per share will
not be less than 110% of the fair value per share of common stock on the option
grant date, and the option term will not exceed five years. Options granted
under the 1995 Option Plan generally vest over four years at a rate of 25% one
year from the grant date and one thirty-sixth per month thereafter and expire
ten years after the grant, or earlier upon employment termination. Options
granted pursuant to the 1995 Option Plan may be exercised prior to vesting, with
the related shares subject to Sangamo's right to repurchase the shares at the
issue price if the option holder terminates employment. The right of repurchase
lapses over the original option vesting period, as described above. A total of
3,700,000 shares were reserved for issuance pursuant to the 1995 Option Plan. A
summary of Sangamo's stock option activity follows:

<TABLE>
<CAPTION>
                                                                          OPTIONS OUTSTANDING
                                                                       -------------------------
                                                                                     WEIGHTED-
                                                   SHARES AVAILABLE                   AVERAGE
                                                     FOR GRANT OF      NUMBER OF    EXERCISE PER
                                                       OPTIONS          SHARES      SHARE PRICE
                                                   ----------------    ---------    ------------
<S>                                                <C>                 <C>          <C>
Balance at December 31, 1996.....................       785,500          392,000       $0.04
  Options granted................................      (816,000)         816,000       $0.08
  Options exercised..............................            --         (100,000)      $0.05
  Options canceled...............................       125,000         (125,000)      $0.04
                                                      ---------        ---------       -----
Balance at December 31, 1997.....................        94,500          983,000       $0.08
  Additional shares authorized...................     1,200,000               --          --
  Options granted................................      (828,000)         828,000       $0.16
  Options exercised..............................            --         (101,750)      $0.03
  Shares repurchased.............................        47,032               --       $0.01
  Options canceled...............................        35,250          (35,250)      $0.08
                                                      ---------        ---------       -----
Balance at December 31, 1998.....................       548,782        1,674,000       $0.12
  Additional shares authorized...................     1,000,000               --          --
  Options granted................................      (459,500)         459,500       $0.22
  Options exercised..............................            --         (191,042)      $0.06
  Options canceled...............................        69,792          (69,792)      $0.10
                                                      ---------        ---------       -----
Balance at December 31, 1999.....................     1,159,074        1,872,666       $0.15
                                                      =========        =========       =====
</TABLE>

     Options outstanding at December 31, 1999 have a weighted average remaining
contractual life of 7.4 years and may be immediately exercised; however,
1,061,472 shares issued pursuant to these
                                      F-14
<PAGE>   89
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4. STOCKHOLDERS' EQUITY (CONTINUED)
options would be subject to Sangamo's right of repurchase. Vested options at
December 31, 1999 total 811,194 and have a weighted average remaining
contractual life of 6.3 years. The weighted-average fair value per share of
options granted during 1997, 1998 and 1999 was $0.44, $1.08 and $5.06,
respectively. All such options were granted with exercise prices below the fair
value of the Company's common stock at the date of grant, as determined in
accordance with the procedure described below.


     As permitted by SFAS 123, Sangamo accounts for its stock option and stock
incentive plans in accordance with APB 25 and recognizes no deferred stock
compensation expense for options granted with exercise prices equal to the fair
market value of Sangamo's common stock at the date of grant. In 1997, 1998 and
1999, Sangamo granted options to employees with exercise prices below the fair
value of Sangamo's common stock. Such fair value was determined based on the
business factors underlying the value of the Company's common stock on the date
such option grants were made, viewed in light of the Company's planned initial
public offering and the expected initial public offering price per share.
Accordingly, the Company recognized deferred stock compensation of $449,000,
$780,000 and $1,482,000, in 1997, 1998 and 1999, respectively, which is being
amortized to expense over the vesting term of the option.


     SFAS 123 requires the disclosure of pro forma information regarding net
loss and net loss per share determined as if Sangamo had accounted for its stock
options under the fair value method. For purposes of this pro forma disclosure,
the estimated fair value of the options is amortized to expense over the
options' vesting period.

<TABLE>
<CAPTION>
                                                       YEAR ENDED DECEMBER 31,
                                                    -----------------------------
                                                     1997       1998       1999
                                                    -------    -------    -------
<S>                                                 <C>        <C>        <C>
Pro forma net loss (in thousands).................  $(1,404)   $(3,296)   $(3,789)
                                                    =======    =======    =======
Pro forma basic and diluted net loss per share....  $ (0.26)   $ (0.56)   $ (0.63)
                                                    =======    =======    =======
</TABLE>

     The above pro forma effect may not be representative of that to be expected
in future years, due to subsequent years including additional grants and related
vesting. The fair value for all options granted in 1997, 1998 and 1999 were
estimated at the date of grant using the minimum value method with the following
weighted-average assumptions:

<TABLE>
<CAPTION>
                                                        YEAR ENDED DECEMBER 31,
                                                     -----------------------------
                                                      1997       1998       1999
                                                     -------    -------    -------
<S>                                                  <C>        <C>        <C>
Risk-free interest rate............................     5.8%       5.0%       6.0%
Expected life of option............................    5 yrs      5 yrs      5 yrs
Expected dividend yield of stock...................       0%         0%         0%
</TABLE>

     In 1998 and 1999, respectively, Sangamo granted 80,000 and 154,000,
nonqualified common stock options to consultants at exercise prices that range
from $0.15 to $0.23 per share for services rendered. Such options are included
in the option tables disclosed above. The options generally vest over four years
at a rate of 25% one year from the grant date and one thirty-sixth per month
thereafter and expire ten years after the grant date. Expense of $128,000 was
recognized in 1999 related to these transactions. The related expense for 1998
was not material. The fair value of these options was determined using the Black
Scholes model with the following assumptions: risk free

                                      F-15
<PAGE>   90
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4. STOCKHOLDERS' EQUITY (CONTINUED)
interest rate -- 6%; term -- 10 years; dividend yield -- 0%; and expected
volatility of the Company's common stock -- .6.

5. LOAN TO AN OFFICER


     Sangamo advanced its President and Chief Executive Officer $250,000 under a
Note Receivable Agreement (the "Note"). The Note bears interest at 6.02% per
annum and is being forgiven one forty-eighth each month beginning January 1,
1998. As of December 31, 1998 and 1999, $187,000 and $125,000, respectively, of
this Note was outstanding, which is included as a component of stockholders'
equity in the accompanying balance sheets. The loan is secured on 500,000 shares
of common stock owned by the Officer.


6. INCOME TAXES

     There has been no provision for U.S. federal, U.S. state, or foreign income
taxes for any period because Sangamo has incurred operating losses in all
periods and for all jurisdictions. Deferred income taxes reflect the net tax
effects of temporary differences between the carrying amounts of assets and
liabilities for financial reporting purposes and the amounts used for income tax
purposes. Significant components of deferred tax assets are as follows:

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              ------------------
                                                               1998       1999
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Deferred tax assets:
  Net operating loss carryforwards..........................  $ 1,600    $ 2,500
  Research and development credit carryforwards.............       --        100
  Other reserves and accruals...............................       --        100
                                                              -------    -------
                                                                1,600      2,700
Valuation allowance.........................................   (1,600)    (2,700)
                                                              -------    -------
Net deferred tax assets.....................................  $    --    $    --
                                                              =======    =======
</TABLE>


     Realization of deferred tax assets is dependent upon future earnings, if
any, the timing and amount of which are uncertain. Accordingly, the net deferred
tax assets have been fully offset by a valuation allowance. The valuation
allowance increased by $1,100,000 each in 1998 and 1999. As of December 31,
1999, Sangamo had net operating loss carryforwards for federal and state income
tax purposes of approximately $7,900,000. Sangamo also had federal research and
development credit carryforwards of approximately $100,000. The net operating
loss and credit carryforwards will expire at various dates beginning in 2010
through 2019, if not used. Use of the net operating loss may be subject to
substantial annual limitation due to the ownership change limitations provided
by the Internal Revenue Code and similar state provisions. The annual limitation
could result in the expiration of the net operating loss before use. However,
management has not determined if the use of the net operating loss carryforwards
will be limited.


                                      F-16
<PAGE>   91
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

7. SUBSEQUENT EVENTS

CONVERTIBLE PREFERRED STOCK SALE

     In January 2000, Sangamo sold 333,333 shares of its Series C convertible
preferred stock to a member of its Board of Directors for net proceeds of
approximately $1,500,000. Subsequent to the commencement of the initial public
offering process, Sangamo re-evaluated the deemed fair value of its common stock
as of January 2000 and determined it to be $12 per share. Accordingly, the
incremental fair value of $1,500,000 is deemed to be the equivalent of a
preferred stock dividend. Sangamo recorded the deemed dividend at the date of
issuance by offsetting charges and credits to preferred stock, without any
effect on total stockholders' equity. The preferred stock dividend increases the
loss applicable to common stockholders in the calculation of basic net loss per
share for the year ended December 31, 2000.

GRANT OF STOCK OPTIONS

     During January through March 2000, Sangamo granted to directors and
employees options to purchase a total of 650,000 shares of common stock at an
exercise prices ranging from $0.625 to $8.00 per share. Sangamo will record
additional deferred stock compensation of $5,790,000 with regard to these
grants.

STRATEGIC PARTNERSHIP

     In January 2000, Sangamo announced that it had entered into a strategic
partner agreement with Edwards LifeScience, Inc., formerly the CardioVascular
Group of Baxter Healthcare Corporation for the development of ZFPs in
cardiovascular and peripheral vascular diseases. Under this agreement, Baxter
has purchased a $5,000,000 convertible note which will convert into common stock
upon consummation of this offering, and Sangamo has received $1,000,000 in
initial research funding from Baxter which was recorded as deferred revenue and
will be recognized as revenue as related research services are performed. In
March 2000, Baxter purchased a $7,500,000 convertible note upon exercise of an
option for a right of first refusal for three years to negotiate a license for
additional ZFP-Therapeutics in cardiovascular and peripheral vascular diseases.
This note will convert into common stock upon consummation of this offering. In
the future, Sangamo may receive option fees, milestone payments, royalties and
additional research funding from this agreement.

EMPLOYEE STOCK PURCHASE PLAN

     The Board of Directors adopted the 2000 Employee Stock Purchase Plan in
February 2000, pending stockholder approval, to be effective upon the completion
of Sangamo's initial public offering of its common stock. Sangamo has reserved a
total of 400,000 shares of common stock for issuance under the plan. Eligible
employees may purchase common stock at 85% of the lesser of the fair market
value of Sangamo's common stock on the first day of the applicable two-year
offering period or the last day of the applicable six-month purchase period.

STOCK INCENTIVE PLAN

     In February 2000, the Board of Directors adopted the 2000 Stock Incentive
Plan (the "2000 Plan") and reserved 2,000,000 shares for future grant
thereunder, which shares include any shares remaining for future grant under the
1995 Option Plan. The terms of the 2000 Plan are substantially

                                      F-17
<PAGE>   92
                           SANGAMO BIOSCIENCES, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

7. SUBSEQUENT EVENTS (CONTINUED)
similar to the 1995 Option Plan. The 2000 Plan also provides for automatic
grants to non-employee directors.

STOCK SPLIT


     On March 28, 2000, Sangamo effected a two-for-one stock split of its common
stock, in the form of a common stock dividend. As a result of the common stock
split, the conversion ratio of Sangamo's convertible preferred stock was
automatically amended to two-to-one in accordance with the Company's articles of
incorporation. All common share and options and per share amounts in the
accompanying financial statements have been adjusted retroactively to reflect
the stock split.


                                      F-18
<PAGE>   93

                                5,000,000 Shares

                                 [SANGAMO LOGO]

                           SANGAMO BIOSCIENCES, INC.

                                  Common Stock

                           -------------------------
                                   PROSPECTUS
                                           , 2000
                           -------------------------

                                LEHMAN BROTHERS
                                   CHASE H&Q
                                  ING BARINGS
                            WILLIAM BLAIR & COMPANY

                                      LOGO
<PAGE>   94

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the costs and expenses, other than the
underwriting discounts and commissions, payable by us in connection with the
sale of common stock being registered. All amounts are estimates except the SEC
registration fee, the NASD filing fees and the Nasdaq National Market listing
fee.

<TABLE>
<S>                                                           <C>
SEC Registration Fee........................................  $   27,800
NASD Filing Fee.............................................      12,000
Nasdaq National Market Listing Fee..........................      95,000
Printing and Engraving Expenses.............................     200,000
Legal Fees and Expenses.....................................     500,000
Accounting Fees and Expenses................................     300,000
Blue Sky Fees and Expenses..................................      10,000
Transfer Agent Fees.........................................      25,000
Miscellaneous...............................................      30,200
                                                              ----------
          Total.............................................  $1,200,000
                                                              ==========
</TABLE>

- -------------------------
* To be provided by amendment

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 145 of the Delaware General Corporation Law authorizes a court to
award or a corporation's board of directors to grant indemnification to
directors and officers in terms sufficiently broad to permit the indemnification
under certain circumstances for liabilities (including reimbursement for
expenses incurred) arising under the Securities Act of 1933, as amended (the
"Securities Act"). Article VII, Section 6 of our bylaws provides for mandatory
indemnification of our directors and officers and permissible indemnification of
employees and other agents to the maximum extent permitted by the Delaware
General Corporation Law. Our certificate of incorporation provides that, subject
to Delaware law, our directors will not be personally liable for monetary
damages for breach of the directors' fiduciary duty as directors to Sangamo
BioSciences, Inc. and its stockholders. This provision in the certificate of
incorporation does not eliminate the directors' fiduciary duty, and in
appropriate circumstances equitable remedies such as injunctive or other forms
of non-monetary relief will remain available under Delaware law. In addition,
each director will continue to be subject to liability for breach of the
director's duty of loyalty to Sangamo or our stockholders for acts or omissions
not in good faith or involving intentional misconduct, for knowing violations of
law, for actions leading to improper personal benefit to the director, and for
payment of dividends or approval of stock repurchases or redemptions that are
unlawful under Delaware law. The provision also does not affect a director's
responsibilities under any other law, such as the federal securities laws or
state or federal environmental laws. We have entered into indemnification
agreements with our officers and directors, a form of which will be filed with
the Securities and Exchange Commission as an exhibit to our registration
statement on Form S-1. The indemnification agreements provide our officers and
directors with further indemnification to the maximum extent permitted by the
Delaware General Corporation Law. Reference is also made to the underwriting
agreement contained in exhibit 1.1 hereto, indemnifying our officers and
directors against specific liabilities, and our Second Amended and Restated
Registration Rights Agreement contained in Exhibit 10.4 hereto, indemnifying the
parties thereto, including controlling stockholders, against liabilities.
                                      II-1
<PAGE>   95

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

     During the past three years, the registrant has issued unregistered
securities to a limited number of persons as described below:

           1. Since inception through December 31, 1999, we have granted a total
     of 2,818,000 options and stock purchase rights to purchase our common
     stock, excluding options returned to our stock plans, with a weighted
     average price of $0.11 to a number of our employees, directors and
     consultants.

           2. From October 31, 1995 to June 28, 1996, we issued warrants to
     purchase 106,250 shares of Series A Preferred Stock, 41,250 at an exercise
     price of $0.01 per share and 65,000 at an exercise price of $1.00 per share
     to several investors.

           3. From October 1995 to August 1999, we issued 791,250 shares of
     Series A Preferred Stock to several investors for a total cash
     consideration of $750,413.

           4. In March 1996, we issued 38,000 shares of Common Stock to Colorado
     Bio/Medical Venture Center, Inc. in connection with a sublease of space.

          5. In June 1996, we issued 75,000 shares of Common Stock to The Johns
     Hopkins University in connection with the License Agreement with us.

           6. In July 1996, we issued 35,000 shares of Common Stock to Frederick
     Frank as compensation for consulting services.

           7. In August 1997, we issued convertible promissory notes in the
     principal amount of $960,000 and warrants to purchase 64,981 shares of
     Series B Preferred Stock at an exercise price of $3.00 per share to several
     investors. The notes were cancelled and converted into shares of Series B
     Preferred Stock on November 6, 1997.

           8. In September 1997, we issued 3,800 shares of common stock to John
     Colin Cahill as compensation for consulting services.

           9. From September 1997 to December 1997, we issued 2,358,000 shares
     of Series B Preferred Stock to several investors for a total cash
     consideration of $7,074,000, which includes conversion of the convertible
     promissory notes and accrued interest thereon described in Item 7 above
     into a total of 324,666 shares of Series B Preferred Stock.

          10. In December 1997, we issued 300,000 shares of Common Stock to
     Edward O. Lanphier II pursuant to the terms of his employment agreement
     with us.

          11. In February 1998, we issued 40,000 shares of Series B Preferred
     Stock to Lehman Brothers, Inc. as compensation for a finder's fee.

          12. From August 1999 to January 2000, we issued 2,000,000 shares of
     Series C Preferred Stock to several investors for a total cash
     consideration of $9,000,000.

     None of the foregoing transactions involved any underwriters, underwriting
discounts or commissions, or any public offering, and we believe that each
transaction was exempt from the registration requirements of the Securities Act
by virtue of Section 4(2) thereof, Regulation D promulgated thereunder or Rule
701 with respect to compensatory benefit plans and contracts relating to
compensation as provided under Rule 701. The recipients in each transaction
represented their intention to acquire the securities for investment only and
not with a view to or for sale in connection with any distribution thereof, and
appropriate legends were affixed to the share certificates and
                                      II-2
<PAGE>   96

instruments issued in these transactions. All recipients had adequate access,
through their relationships with us, to information about us.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) EXHIBITS


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
  1.1     Form of Underwriting Agreement.
  3.1     Amended and Restated Certificate of Incorporation.
  3.2     Amended and Restated Bylaws.
  4.1     Form of Specimen Common Stock Certificate.
  4.2     Second Amended and Restated Investors' Rights Agreement,
          among Sangamo and certain of its stockholders, dated March,
          2000.
  5.1++   Opinion of Brobeck, Phleger & Harrison LLP regarding the
          legality of the common stock being registered.
 10.1++   2000 Stock Incentive Plan.
 10.2++   2000 Employee Stock Purchase Plan.
 10.3     [Intentionally left blank]
 10.4++   Form of Indemnification Agreement to be entered into between
          Sangamo and each of its directors and executive officers.
 10.5++   Triple Net Laboratory Lease, between Sangamo and Point
          Richmond R&D Associates II, LLC, dated May 23, 1997.
 10.6++   Form of collaboration agreement.
 10.7+    License Agreement, between Sangamo and Baxter Healthcare
          Corporation, dated January 11, 2000.
 10.8+    Sublicense Agreement, by and between Sangamo and Johnson &
          Johnson, dated May 9, 1996.
 10.9+    ZFP Material Transfer Agreement, between Sangamo and Japan
          Tobacco Inc., dated March 8, 1999.
10.10++   Financial Assistance Award from U.S. Department of Commerce,
          dated March 31, 1997.
10.11++   Notice of Grant Award from National Institute of Allergy and
          Infectious Diseases, dated August 9, 1999.
 10.12+   Patent License Agreement between Sangamo and Massachusetts
          Institute of Technology dated May 9, 1996.
 10.13+   License Agreement between Sangamo and the Johns Hopkins
          University dated July 16, 1998.
 10.14+   License Agreement between Sangamo and the Medical Research
          Council dated September 1, 1996.
10.15++   Employment Agreement, between Sangamo and Edward O. Lanpher
          II, dated June 1, 1997.
10.16++   1995 Stock Option Plan.
10.17++   Research Funding Agreement, by and between Sangamo and
          Baxter Healthcare Corporation, dated January 11, 2000.
 23.1     Consent of Ernst & Young LLP, Independent Auditors.
 23.2++   Consent of Brobeck, Phleger & Harrison LLP (contained in
          their opinion filed as Exhibit 5.1).
 23.3++   Consent of Townsend and Townsend and Crew LLP.
</TABLE>


                                      II-3
<PAGE>   97


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
 24.1++   Power of Attorney. (see Page II-5)
 27.1++   Financial Data Schedule.
</TABLE>


- -------------------------
* To be filed by amendment.

+ Confidential treatment requested as to portions of this exhibit.

++ Previously filed.

(b) FINANCIAL STATEMENT SCHEDULE

     Schedules not listed have been omitted because the information required to
be set forth therein is not applicable or is shown in the financial statements
on the notes thereto.

ITEM 17. UNDERTAKINGS

     We undertake to provide to the underwriters at the closing specified in the
underwriting agreement, certificates in such denominations and registered in
such names as required by the underwriters to permit prompt delivery to each
purchaser.

     To the extent indemnification for liabilities arising under the Securities
Act may be permitted to our directors, officers and controlling persons
according to the Delaware General Corporation Law, our certificate of
incorporation or our bylaws, indemnification agreements entered into between us
and our officers and directors, the underwriting agreement, or otherwise, we
have been advised that in the opinion of the commission this indemnification is
against public policy as expressed in the Securities Act, and is, therefore,
unenforceable. If a claim for indemnification against these liabilities (other
than the payment by us of expenses incurred or paid by any of our directors,
officers or controlling persons in the successful defense of any action, suit or
proceeding) is asserted by a director, officer or controlling person in
connection with the securities being registered, we will, unless in the opinion
of our counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question of whether this indemnification
by us is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of the issue.

     The undersigned registrant hereby undertakes:

          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of Prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of Prospectus filed by us under Rule 424(b)(1) or (4) or 497(h) of the
     Securities Act shall be deemed to be part of this registration statement as
     of the time it was declared effective;

          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of those securities at that time shall be
     deemed to be the initial bona fide offering thereof.

                                      II-4
<PAGE>   98

                                   SIGNATURES


     Under the requirements of the Securities Act of 1933, as amended, the
registrant has duly caused this Amendment No. 3 to the Registration Statement to
be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of San Francisco, State of California, on April 4, 2000.


                                          SANGAMO BIOSCIENCES, INC.

                                          By:     /s/ SHAWN K. JOHNSON
                                            ------------------------------------
                                                      Shawn K. Johnson
                                                    Director of Finance

     Under the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:


<TABLE>
<CAPTION>
                      SIGNATURE                                     TITLE                   DATE
                      ---------                                     -----                   ----
<S>                                                    <C>                              <C>
                          *                              President, Chief Executive     April 4, 2000
- -----------------------------------------------------       Officer and Director
                Edward O. Lanphier II                   (Principal Executive Officer)

                /s/ SHAWN K. JOHNSON                         Director of Finance        April 4, 2000
- -----------------------------------------------------  (Principal Accounting Officer)
                  Shawn K. Johnson

                                                                  Director              April 4, 2000
- -----------------------------------------------------
               Herbert W. Boyer, Ph.D.

                          *                                       Director              April 4, 2000
- -----------------------------------------------------
               William G. Gerber, M.D.

                          *                                       Director              April 4, 2000
- -----------------------------------------------------
                   John W. Larson

                          *                                       Director              April 4, 2000
- -----------------------------------------------------
              William J. Rutter, Ph.D.

                          *                                       Director              April 4, 2000
- -----------------------------------------------------
                   Michael C. Wood

          *By:        /s/  Shawn K. Johnson
                  Shawn K. Johnson
                  Attorney-in-Fact
</TABLE>


                                      II-5
<PAGE>   99

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
 1.1      Form of Underwriting Agreement.
 3.1      Amended and Restated Certificate of Incorporation.
 3.2      Amended and Restated Bylaws.
 4.1      Form of Specimen Common Stock Certificate.
 4.2      Second Amended and Restated Investors' Rights Agreement,
          among Sangamo and certain of its stockholders, dated March,
          2000.
 5.1++    Opinion of Brobeck, Phleger & Harrison LLP regarding the
          legality of the common stock being registered.
10.1++    2000 Stock Incentive Plan.
10.2++    2000 Employee Stock Purchase Plan.
10.3      [Intentionally left blank]
10.4++    Form of Indemnification Agreement to be entered into between
          Sangamo and each of its directors and executive officers.
10.5++    Triple Net Laboratory Lease, between Sangamo and Point
          Richmond R&D Associates II, LLC, dated May 23, 1997.
10.6++    Form of collaboration agreement.
10.7+     License Agreement, between Sangamo and Baxter Healthcare
          Corporation, dated January 11, 2000.
10.8+     Sublicense Agreement, by and between Sangamo and Johnson &
          Johnson, dated May 9, 1996.
10.9+     ZFP Material Transfer Agreement, between Sangamo and Japan
          Tobacco Inc., dated March 8, 1999.
10.10++   Financial Assistance Award from U.S. Department of Commerce,
          dated March 31, 1997.
10.11++   Notice of Grant Award from National Institute of Allergy and
          Infectious Diseases, dated August 9, 1999.
10.12+    Patent License Agreement between Sangamo and Massachusetts
          Institute of Technology dated May 9, 1996.
10.13+    License Agreement between Sangamo and the Johns Hopkins
          University dated July 16, 1998.
10.14+    License Agreement between Sangamo and the Medical Research
          Council dated September 1, 1996.
10.15++   Employment Agreement, between Sangamo and Edward O. Lanphier
          II, dated June 1, 1997.
10.16++   1995 Stock Option Plan.
10.17++   Research Funding Agreement, by and between Sangamo and
          Baxter Healthcare Corporation, dated January 11, 2000.
23.1      Consent of Ernst & Young LLP, Independent Auditors.
23.2++    Consent of Brobeck, Phleger & Harrison LLP (contained in
          their opinion filed as Exhibit 5.1).
23.3++    Consent of Townsend and Townsend and Crew LLP.
24.1++    Power of Attorney. (see Page II-5)
27.1++    Financial Data Schedule.
</TABLE>


- -------------------------
* To be filed by amendment.

+ Confidential treatment requested as to portions of this exhibit.

++ Previously filed.

<PAGE>   1
                                                                     EXHIBIT 1.1



                                5,000,000 SHARES

                            SANGAMO BIOSCIENCES, INC.

                                  COMMON STOCK

                             UNDERWRITING AGREEMENT

                                                                  _____ __, 2000


LEHMAN BROTHERS INC.
CHASE SECURITIES INC.
ING BARINGS LLC
WILLIAM BLAIR & COMPANY, L.L.C.
NATIONAL FINANCIAL SERVICES CORPORATION
As Representatives of the several
  Underwriters named in Schedule 1,
c/o Lehman Brothers Inc.
Three World Financial Center
New York, New York 10285

Dear Sirs:

               Sangamo BioSciences, Inc., a Delaware corporation (the
"Company"), proposes to sell 5,000,000 shares (the "Firm Stock") of the
Company's common stock, par value $0.01 per share (the "Common Stock"). In
addition, the Company proposes to grant to the Underwriters named in Schedule 1
hereto (the "Underwriters") an option to purchase up to an additional 750,000
shares of the Common Stock on the terms and for the purposes set forth in
Section 3 (the "Option Stock"). The Firm Stock and the Option Stock, if
purchased, are hereinafter collectively called the "Stock." This is to confirm
the agreement concerning the purchase of the Stock from the Company by the
Underwriters.

               1. Representations, Warranties and Agreements of the Company. The
Company represents, warrants and agrees that:

                      (a) A registration statement on Form S-1 with respect to
               the Stock has (i) been prepared by the Company in conformity with
               the requirements of the United States Securities Act of 1933, as
               amended (the "Securities Act"), and the rules and regulations of
               the Commission (the "Rules and Regulations") of the United States
               Securities and Exchange Commission (the "Commission") thereunder,
               (ii) been filed with the Commission under the Securities Act and
               (iii) become effective under the Securities Act. Copies of such
               registration statement have been delivered by the Company to you
               as the representatives (the "Representatives") of the
               Underwriters. As used in this Agreement, "Effective Time" means
               the date and the time as of which such registration statement, or
               the

<PAGE>   2
               most recent post-effective amendment thereto, if any, was
               declared effective by the Commission; "Effective Date" means the
               date of the Effective Time; "Preliminary Prospectus" means each
               prospectus included in such registration statement, or amendments
               thereof, before it became effective under the Securities Act and
               any prospectus filed with the Commission by the Company with the
               consent of the Representatives pursuant to Rule 424(a) of the
               Rules and Regulations; "Registration Statement" means such
               registration statement, as amended at the Effective Time,
               including all information contained in the final prospectus filed
               with the Commission pursuant to Rule 424(b) of the Rules and
               Regulations in accordance with Section 5 hereof and deemed to be
               a part of the registration statement as of the Effective Time
               pursuant to paragraph (b) of Rule 430A of the Rules and
               Regulations; and "Prospectus" means such final prospectus, as
               first filed with the Commission pursuant to paragraph (1) or (4)
               of Rule 424(b) of the Rules and Regulations. The Commission has
               not issued any order preventing or suspending the use of any
               Preliminary Prospectus.

                      (b) The Registration Statement conforms, and the
               Prospectus and any further amendments or supplements to the
               Registration Statement or the Prospectus will, when they become
               effective or are filed with the Commission, as the case may be,
               conform in all respects to the requirements of the Securities Act
               and the Rules and Regulations and do not and will not, as of the
               applicable effective date (as to the Registration Statement and
               any amendment thereto) and as of the applicable filing date (as
               to the Prospectus and any amendment or supplement thereto)
               contain any untrue statement of a material fact or omit to state
               a material fact required to be stated therein or necessary to
               make the statements therein not misleading; provided that no
               representation or warranty is made as to information contained in
               or omitted from the Registration Statement or the Prospectus in
               reliance upon and in conformity with written information
               furnished to the Company through the Representatives by or on
               behalf of any Underwriter specifically for inclusion therein.

                      (c) The Company has been duly incorporated and is validly
               existing as a corporation in good standing under the laws of
               Delaware, is duly qualified to do business and is in good
               standing as a foreign corporation in each jurisdiction in which
               its ownership or lease of property or the conduct of its business
               requires such qualification, and has all power and authority
               necessary to own or hold its properties and to conduct the
               business in which it is engaged, except where the failure to so
               qualify would not in the aggregate have a material adverse
               effect; and the Company has no subsidiaries.

                      (d) The Company has an authorized capitalization as set
               forth in the Prospectus, and all of the issued shares of capital
               stock of the Company have been duly and validly authorized and
               issued, are fully paid and non-assessable and conform to the
               description thereof contained in the Prospectus.


                                       2
<PAGE>   3
                      (e) The shares of the Stock to be issued and sold by the
               Company to the Underwriters hereunder have been duly and validly
               authorized and when issued and delivered against payment therefor
               as provided herein, will be duly and validly issued, fully paid
               and non-assessable; and the Stock will conform to the
               descriptions thereof contained in the Prospectus.

                      (f) This Agreement has been duly authorized, executed and
               delivered by the Company.

                      (g) The execution, delivery and performance of this
               Agreement by the Company and the consummation of the transactions
               contemplated hereby will not conflict with or result in a breach
               or violation of any of the terms or provisions of, or constitute
               a default under, any indenture, mortgage, deed of trust, loan
               agreement or other agreement or instrument to which the Company
               is a party or by which the Company is bound or to which any of
               the property or assets of the Company is subject, nor will such
               actions result in any violation of the provisions of the charter
               or bylaws of the Company or any statute or any order, rule or
               regulation of any court or governmental agency or body having
               jurisdiction over the Company or any of its properties or assets;
               and except for the registration of the Stock under the Securities
               Act and such consents, approvals, authorizations, registrations
               or qualifications as may be required under the Securities
               Exchange Act of 1934, as amended (the "Exchange Act"), and
               applicable state securities laws in connection with the purchase
               and distribution of the Stock by the Underwriters, no consent,
               approval, authorization or order of, or filing or registration
               with, any such court or governmental agency or body is required
               for the execution, delivery and performance of this Agreement by
               the Company and the consummation of the transactions contemplated
               hereby.

                      (h) There are no contracts, agreements or understandings
               between the Company and any person granting such person the right
               (other than rights which have been waived or satisfied) to
               require the Company, with respect to any securities of the
               Company owned or to be owned by such person, to include such
               securities in the securities registered pursuant to the
               Registration Statement. Except as described in the Prospectus,
               there are no contracts, agreements, or understandings between the
               Company and any person granting such person the right to require
               the Company to register securities or include such securities in
               any other registration statement filed by the Company under the
               Securities Act.

                      (i) Except as described in the Prospectus, the Company has
               not sold or issued any shares of Common Stock during the
               six-month period preceding the date of the Prospectus, including
               any sales pursuant to Rule 144A under, or Regulations D or S of,
               the Securities Act, other than shares issued pursuant to employee
               benefit plans, qualified stock options plans or other employee
               compensation plans or pursuant to outstanding options, rights or
               warrants.


                                       3
<PAGE>   4
                      (j) The Company has not sustained, since the date of the
               latest audited financial statements included in the Prospectus,
               any material loss or interference with its business from fire,
               explosion, flood or other calamity, whether or not covered by
               insurance, or from any labor dispute or court or governmental
               action, order or decree, otherwise than as set forth or
               contemplated in the Prospectus; and, since such date, there has
               not been any change in the capital stock or long-term debt of the
               Company or any material adverse change, or any development
               involving a prospective material adverse change, in or affecting
               the general affairs, management, financial position,
               stockholders' equity or results of operations of the Company,
               otherwise than as set forth or contemplated in the Prospectus.

                      (k) The financial statements (including the related notes
               and supporting schedules) filed as part of the Registration
               Statement or included in the Prospectus present fairly the
               financial condition and results of operations of the Company, at
               the dates and for the periods indicated, and have been prepared
               in conformity with generally accepted accounting principles
               applied on a consistent basis throughout the periods involved.

                      (l) Ernst & Young LLP, who have certified certain
               financial statements of the Company, whose report appears in the
               Prospectus and who have delivered the initial letter referred to
               in Section 7(h) hereof, are independent public accountants as
               required by the Securities Act and the Rules and Regulations.

                      (m) The Company has good and marketable title to all
               personal property owned by it, in each case free and clear of all
               liens, encumbrances and defects except such as are described in
               the Prospectus or such as do not materially affect the value of
               such property and do not materially interfere with the use made
               and proposed to be made of such property by the Company; and all
               real property and buildings held under lease by the Company are
               held by it under valid, subsisting and enforceable leases, with
               such exceptions as are not material and do not interfere with the
               use made and proposed to be made of such property and buildings
               by the Company.

                      (n) The Company carries, or is covered by, insurance in
               such amounts and covering such risks as is adequate for the
               conduct of its respective businesses and the value of their
               respective properties and as is customary for companies engaged
               in similar businesses in similar industries.

                      (o) The Company owns or possesses adequate rights to use
               all material patents, patent applications, trademarks, service
               marks, trade names, trademark registrations, service mark
               registrations, copyrights, know-how, manufacturing processes,
               formulae, trade secrets, licenses and rights in any thereof and
               any other intangible property and assets (herein called the
               "Proprietary Rights") necessary to conduct its business in the
               manner described in the Prospectus. The Company


                                       4
<PAGE>   5
               takes security measures to provide adequate trade secret
               protection in its non-patented technology. Except as disclosed in
               the Prospectus, the Company has not received any notice of
               infringement or conflict with asserted rights of others with
               respect to any Proprietary Rights which could result in any
               material adverse effect on the Company, and except as described
               in the Prospectus, no action, suit, arbitration, or legal,
               administrative or other proceeding, or investigation is pending,
               or, to the knowledge of the Company, is threatened, which
               involves any Proprietary Rights. The Proprietary Rights of the
               Company referred to in the Prospectus do not, to the best
               knowledge of the Company, infringe or conflict with any right or
               valid and enforceable patent of any third party, or any
               discovery, invention, product or process which is the subject of
               a patent application filed by any third party, known to the
               Company which could have a material adverse effect on the
               Company. The Company is not subject to any judgment, order, writ,
               injunction or decree of any court or any Federal, state, local,
               foreign or other governmental department, commission, board,
               bureau, agency or instrumentality, domestic or foreign, or any
               arbitrator, nor, except as described in the Prospectus, has it
               entered into or is a party to any contract which restricts or
               impairs the use of any such Proprietary Rights in a manner which
               would have a material adverse effect on the use of any of the
               Proprietary Rights. The Company has complied, in all material
               respects, with its respective contractual obligations relating to
               the protection of the Proprietary Rights used pursuant to
               licenses. To the best knowledge of the Company, no person is
               infringing on or violating the Proprietary Rights owned or used
               by the Company.

                      (p) There are no legal or governmental proceedings pending
               to which the Company is a party or of which any property or
               assets of the Company is the subject which, if determined
               adversely to the Company, might have a material adverse effect on
               the financial position, stockholders' equity, results of
               operations, business or prospects of the Company; and to the best
               of the Company's knowledge, no such proceedings are threatened or
               contemplated by governmental authorities or threatened by others.

                      (q) There are no contracts or other documents which are
               required to be described in the Prospectus or filed as exhibits
               to the Registration Statement by the Securities Act or by the
               Rules and Regulations which have not been described in the
               Prospectus or filed as exhibits to the Registration Statement or
               incorporated therein by reference as permitted by the Rules and
               Regulations.

                      (r) No relationship, direct or indirect, exists between or
               among the Company on the one hand, and the directors, officers,
               stockholders, customers or suppliers of the Company on the other
               hand, which is required to be described in the Prospectus which
               is not so described.

                      (s) No labor disturbance by the employees of the Company
               exists or, to the knowledge of the Company, is imminent which
               would reasonably be


                                       5
<PAGE>   6
               expected to have a material adverse effect on the financial
               position, stockholders' equity, results of operations, business
               or prospects of the Company.

                      (t) The Company is in compliance in all material respects
               with all presently applicable provisions of the Employee
               Retirement Income Security Act of 1974, as amended, including the
               regulations and published interpretations thereunder ("ERISA");
               no "reportable event" (as defined in ERISA) has occurred with
               respect to any "pension plan" (as defined in ERISA) for which the
               Company would have any liability; the Company has not incurred
               and does not expect to incur liability under (i) Title IV of
               ERISA with respect to termination of, or withdrawal from, any
               "pension plan" or (ii) Sections 412 or 4971 of the Internal
               Revenue Code of 1986, as amended, including the regulations and
               published interpretations thereunder (the "Code"); and each
               "pension plan" for which the Company would have any liability
               that is intended to be qualified under Section 401(a) of the Code
               is so qualified in all material respects and nothing has
               occurred, whether by action or by failure to act, which would
               cause the loss of such qualification.

                      (u) The Company has filed all federal, state and local
               income and franchise tax returns required to be filed through the
               date hereof and has paid all taxes due thereon, and no tax
               deficiency has been determined adversely to the Company which has
               had (nor does the Company have any knowledge of any tax
               deficiency which, if determined adversely to the Company, might
               have) a material adverse effect on the financial position,
               stockholders' equity, results of operations, business or
               prospects of the Company.

                      (v) Since the date as of which information is given in the
               Prospectus through the date hereof, and except as may otherwise
               be disclosed in the Prospectus, the Company has not (i) issued or
               granted any securities, (ii) incurred any liability or
               obligation, direct or contingent, other than liabilities and
               obligations which were incurred in the ordinary course of
               business, (iii) entered into any transaction not in the ordinary
               course of business or (iv) declared or paid any dividend on its
               capital stock.

                      (w) The Company (i) makes and keeps accurate books and
               records and (ii) maintains internal accounting controls which
               provide reasonable assurance that (A) transactions are executed
               in accordance with management's authorization, (B) transactions
               are recorded as necessary to permit preparation of its financial
               statements and to maintain accountability for its assets, (C)
               access to its assets is permitted only in accordance with
               management's authorization and (D) the reported accountability
               for its assets is compared with existing assets at reasonable
               intervals.

                      (x) The Company is not (i) in violation of its charter or
               bylaws, (ii) in default in any material respect, and no event has
               occurred which, with notice or lapse of time or both, would
               constitute such a default, in the due performance or


                                       6
<PAGE>   7
               observance of any term, covenant or condition contained in any
               material indenture, mortgage, deed of trust, loan agreement or
               other agreement or instrument to which it is a party or by which
               it is bound or to which any of its properties or assets is
               subject or (iii) in violation in any material respect of any law,
               ordinance, governmental rule, regulation or court decree to which
               it or its property or assets may be subject. The Company has not
               failed to obtain any material license, permit, certificate,
               franchise or other governmental authorization or permit necessary
               to the ownership of its property or to the conduct of its
               business where the failure to do so would have a material adverse
               effect on the Company's business, financial condition, or results
               of operations.

                      (y) Neither the Company, nor any director, officer, agent,
               employee or other person associated with or acting on behalf of
               the Company, has used any corporate funds for any unlawful
               contribution, gift, entertainment or other unlawful expense
               relating to political activity; made any direct or indirect
               unlawful payment to any foreign or domestic government official
               or employee from corporate funds; violated or is in violation of
               any provision of the Foreign Corrupt Practices Act of 1977; or
               made any bribe, rebate, payoff, influence payment, kickback or
               other unlawful payment.

                      (z) There has been no storage, disposal, generation,
               manufacture, refinement, transportation, handling or treatment of
               toxic wastes, medical wastes, hazardous wastes or hazardous
               substances by the Company (or, to the knowledge of the Company,
               any of its predecessors in interest) at, upon or from any of the
               property now or previously owned or leased by the Company in
               violation of any applicable law, ordinance, rule, regulation,
               order, judgment, decree or permit or which would require remedial
               action under any applicable law, ordinance, rule, regulation,
               order, judgment, decree or permit, except for any violation or
               remedial action which would not have, or could not be reasonably
               likely to have, singularly or in the aggregate with all such
               violations and remedial actions, a material adverse effect on the
               general affairs, management, financial position, stockholders'
               equity, results of operations or prospects of the Company; there
               has been no material spill, discharge, leak, emission, injection,
               escape, dumping or release of any kind onto such property or into
               the environment surrounding such property of any toxic wastes,
               medical wastes, solid wastes, hazardous wastes or hazardous
               substances due to or caused by the Company or with respect to
               which the Company has knowledge, except for any such spill,
               discharge, leak, emission, injection, escape, dumping or release
               which would not have or would not be reasonably likely to have,
               singularly or in the aggregate with all such spills, discharges,
               leaks, emissions, injections, escapes, dumpings and releases, a
               material adverse effect on the general affairs, management,
               financial position, stockholders' equity, results of operations
               or prospects of the Company; and the terms "hazardous wastes",
               "toxic wastes", "hazardous substances" and "medical wastes" shall
               have the meanings specified in any applicable local, state,
               federal and foreign laws or regulations with respect to
               environmental protection.


                                       7
<PAGE>   8
                      (aa) The Company is not an "investment company" or
               "controlled by investment company" within the meaning of such
               terms under the Investment Company Act of 1940 and the Rules and
               Regulations thereunder.

                      (bb) No consent, approval, authorization or order of, or
               qualification with, any governmental body or agency, other than
               those obtained, is required in connection with the offering of up
               to ____________ shares of the Stock, which Lehman has agreed to
               reserve for sale to the Company's employees and persons having
               business relationships with the Company.

               2. Purchase of the Stock by the Underwriters. On the basis of the
representations and warranties contained in, and subject to the terms and
conditions of, this Agreement, the Company agrees to sell 5,000,000 shares of
the Firm Stock to the several Underwriters and each of the Underwriters,
severally and not jointly, agrees to purchase the number of shares of the Firm
Stock set opposite that Underwriter's name in Schedule 1 hereto. The respective
purchase obligations of the Underwriters with respect to the Firm Stock shall be
rounded among the Underwriters to avoid fractional shares, as the
Representatives may determine.

               In addition, the Company grants to the Underwriters an option to
purchase up to 750,000 shares of Option Stock. Such option is granted for the
purpose of covering over-allotments in the sale of Firm Stock and is exercisable
as provided in Section 4 hereof. Shares of Option Stock shall be purchased
severally for the account of the Underwriters in proportion to the number of
shares of Firm Stock set opposite the name of such Underwriters in Schedule 1
hereto. The respective purchase obligations of each Underwriter with respect to
the Option Stock shall be adjusted by the Representatives so that no Underwriter
shall be obligated to purchase Option Stock other than in 100 share amounts. The
price of both the Firm Stock and any Option Stock shall be $_____ per share.

               The Company shall not be obligated to deliver any of the Stock to
be delivered on any Delivery Date (as hereinafter defined), as the case may be,
except upon payment for all the Stock to be purchased on such Delivery Date as
provided herein.

               3. Offering of Stock by the Underwriters. Upon authorization by
the Representatives of the release of the Firm Stock, the several Underwriters
propose to offer the Firm Stock for sale upon the terms and conditions set forth
in the Prospectus.

               It is understood that _______ shares of the Firm Stock will
initially be reserved by the several Underwriters for offer and sale upon the
terms and conditions set forth in the Prospectus and in accordance with the
rules and regulations of the National Association of Securities Dealers, Inc. to
employees and persons having business relationships with the Company who have
heretofore delivered to the Representatives offers to purchase shares of Firm
Stock in form satisfactory to the Representatives, and that any allocation of
such Firm Stock among such persons will be made in accordance with timely
directions received by the Representatives from the Company; provided, that
under no circumstances will the Representatives or any Underwriter be liable to
the Company or to any such person for any action


                                       8
<PAGE>   9
taken or omitted in good faith in connection with such offering to employees and
persons having business relationships with the Company. It is further understood
that any shares of such Firm Stock which are not purchased by such persons will
be offered by the Underwriters to the public upon the terms and conditions set
forth in the Prospectus.

               4. Delivery of and Payment for the Stock. Delivery of and payment
for the Firm Stock shall be made at the office of Brobeck, Phleger & Harrison
LLP, One Market-Spear Street Tower, San Francisco, California 94105 at 10:00
A.M., New York City time, on the [3rd or 4th] full business day following the
date of this Agreement or at such other date or place as shall be determined by
agreement between the Representatives and the Company. This date and time are
sometimes referred to as the "First Delivery Date." On the First Delivery Date,
the Company shall deliver or cause to be delivered certificates representing the
Firm Stock to the Representatives for the account of each Underwriter against
payment to or upon the order of the Company of the purchase price by wire
transfer in immediately available funds. Time shall be of the essence, and
delivery at the time and place specified pursuant to this Agreement is a further
condition of the obligation of each Underwriter hereunder. Upon delivery, the
Firm Stock shall be registered in such names and in such denominations as the
Representatives shall request in writing not less than two full business days
prior to the First Delivery Date. For the purpose of expediting the checking and
packaging of the certificates for the Firm Stock, the Company shall make the
certificates representing the Firm Stock available for inspection by the
Representatives in New York, New York, not later than 2:00 P.M., New York City
time, on the business day prior to the First Delivery Date.

               The option granted in Section 2 will expire 30 days after the
date of this Agreement and may be exercised in whole or in part from time to
time by written notice being given to the Company by the Representatives. Such
notice shall set forth the aggregate number of shares of Option Stock as to
which the option is being exercised, the names in which the shares of Option
Stock are to be registered, the denominations in which the shares of Option
Stock are to be issued and the date and time, as determined by the
Representatives, when the shares of Option Stock are to be delivered; provided,
however, that this date and time shall not be earlier than the First Delivery
Date nor earlier than the second business day after the date on which the option
shall have been exercised nor later than the fifth business day after the date
on which the option shall have been exercised. The date and time the shares of
Option Stock are delivered are sometimes referred to as a "Second Delivery Date"
and the First Delivery Date and any Second Delivery Date are sometimes each
referred to as a "Delivery Date."

               Delivery of and payment for the Option Stock shall be made at the
place specified in the first sentence of the first paragraph of this Section 4
(or at such other place as shall be determined by agreement between the
Representatives and the Company) at 10:00 A.M., New York City time, on such
Second Delivery Date. On such Second Delivery Date, the Company shall deliver or
cause to be delivered the certificates representing the Option Stock to the
Representatives for the account of each Underwriter against payment to or upon
the order of the Company of the purchase price by wire transfer in immediately
available funds. Time shall be of the essence, and delivery at the time and
place specified pursuant to this Agreement is a further condition of the
obligation of each Underwriter hereunder. Upon delivery, the Option Stock shall
be registered in such names and in such denominations as the Representatives
shall request


                                       9
<PAGE>   10
in the aforesaid written notice. For the purpose of expediting the checking and
packaging of the certificates for the Option Stock, the Company shall make the
certificates representing the Option Stock available for inspection by the
Representatives in New York, New York, not later than 2:00 P.M., New York City
time, on the business day prior to such Second Delivery Date.

               5. Further Agreements of the Company. The Company agrees:

                      (a) To prepare the Prospectus in a form approved by the
               Representatives and to file such Prospectus pursuant to Rule
               424(b) under the Securities Act not later than Commission's close
               of business on the second business day following the execution
               and delivery of this Agreement or, if applicable, such earlier
               time as may be required by Rule 430A(a)(3) under the Securities
               Act; to make no further amendment or any supplement to the
               Registration Statement or to the Prospectus except as permitted
               herein; to advise the Representatives, promptly after it receives
               notice thereof, of the time when any amendment to the
               Registration Statement has been filed or becomes effective or any
               supplement to the Prospectus or any amended Prospectus has been
               filed and to furnish the Representatives with copies thereof; to
               advise the Representatives, promptly after it receives notice
               thereof, of the issuance by the Commission of any stop order or
               of any order preventing or suspending the use of any Preliminary
               Prospectus or the Prospectus, of the suspension of the
               qualification of the Stock for offering or sale in any
               jurisdiction, of the initiation or threatening of any proceeding
               for any such purpose, or of any request by the Commission for the
               amending or supplementing of the Registration Statement or the
               Prospectus or for additional information; and, in the event of
               the issuance of any stop order or of any order preventing or
               suspending the use of any Preliminary Prospectus or the
               Prospectus or suspending any such qualification, to use promptly
               its best efforts to obtain its withdrawal;

                      (b) To furnish promptly to each of the Representatives and
               to counsel for the Underwriters a signed copy of the Registration
               Statement as originally filed with the Commission, and each
               amendment thereto filed with the Commission, including all
               consents and exhibits filed therewith;

                      (c) To deliver promptly to the Representatives such number
               of the following documents as the Representatives shall
               reasonably request: (i) conformed copies of the Registration
               Statement as originally filed with the Commission and each
               amendment thereto (in each case including exhibits other than
               this Agreement and the computation of per share earnings) and
               (ii) each Preliminary Prospectus, the Prospectus and any amended
               or supplemented Prospectus; and, if the delivery of a prospectus
               is required at any time after the Effective Time in connection
               with the offering or sale of the Stock or any other securities
               relating thereto and if at such time any event shall have
               occurred as a result of which the Prospectus as then amended or
               supplemented would include an untrue statement of a material fact
               or omit to state any material fact necessary in order to make the
               statements therein, in the light of the circumstances under which


                                       10
<PAGE>   11
               they were made when such Prospectus is delivered, not misleading,
               or, if for any other reason it shall be necessary to amend or
               supplement the Prospectus in order to comply with the Securities
               Act, to notify the Representatives and, upon their request, to
               file such amended or supplemental prospectus and to prepare and
               furnish without charge to each Underwriter and to any dealer in
               securities as many copies as the Representatives may from time to
               time reasonably request of an amended or supplemented Prospectus
               which will correct such statement or omission or effect such
               compliance;

                      (d) To file promptly with the Commission any amendment to
               the Registration Statement or the Prospectus or any supplement to
               the Prospectus that may, in the judgment of the Company or the
               Representatives, be required by the Securities Act or requested
               by the Commission;

                      (e) Prior to filing with the Commission any amendment to
               the Registration Statement or supplement to the Prospectus or any
               Prospectus pursuant to Rule 424 of the Rules and Regulations, to
               furnish a copy thereof to the Representatives and counsel for the
               Underwriters and obtain the consent of the Representatives to the
               filing;

                      (f) As soon as practicable after the Effective Date to
               make generally available to the Company's security holders and to
               deliver to the Representatives an earnings statement of the
               Company (which need not be audited) complying with Section 11(a)
               of the Securities Act and the Rules and Regulations (including,
               at the option of the Company, Rule 158);

                      (g) For a period of five years following the Effective
               Date, to furnish to the Representatives copies of all materials
               furnished by the Company to its stockholders and all public
               reports and all reports and financial statements furnished by the
               Company to the principal national securities exchange upon which
               the Common Stock may be listed pursuant to requirements of or
               agreements with such exchange or to the Commission pursuant to
               the Exchange Act or any rule or regulation of the Commission
               thereunder;

                      (h) Promptly from time to time to take such action as the
               Representatives may reasonably request to qualify the Stock for
               offering and sale under the securities laws of such jurisdictions
               as the Representatives may request and to comply with such laws
               so as to permit the continuance of sales and dealings therein in
               such jurisdictions for as long as may be necessary to complete
               the distribution of the Stock, provided that in connection
               therewith the Company shall not be required to qualify as a
               foreign corporation or to file a general consent to service of
               process in any jurisdiction;

                      (i) For a period of 180 days from the date of the
               Prospectus, not to, directly or indirectly, (1) offer for sale,
               sell, pledge or otherwise dispose of (or enter into any
               transaction or device which is designed to, or could be expected
               to,


                                       11
<PAGE>   12
               result in the disposition by any person at any time in the future
               of) any shares of Common Stock or securities convertible into or
               exchangeable for Common Stock (other than the Stock and shares
               issued pursuant to employee benefit plans, qualified stock option
               plans or other employee compensation plans existing on the date
               hereof or pursuant to currently outstanding options, warrants or
               rights), or sell or grant options, rights or warrants with
               respect to any shares of Common Stock or securities convertible
               into or exchangeable for Common Stock (other than the grant of
               options pursuant to option plans existing on the date hereof), or
               (2) enter into any swap or other derivatives transaction that
               transfers to another, in whole or in part, any of the economic
               benefits or risks of ownership of such shares of Common Stock,
               whether any such transaction described in clause (1) or (2) above
               is to be settled by delivery of Common Stock or other securities,
               in cash or otherwise, in each case without the prior written
               consent of Lehman Brothers Inc. and to cause each officer and
               director of the Company and specified stockholders of the Company
               to furnish to the Representatives, prior to the First Delivery
               Date, a letter or letters, in form and substance satisfactory to
               counsel for the Underwriters, pursuant to which each such person
               shall agree not to, directly or indirectly, (1) offer for sale,
               sell, pledge or otherwise dispose of (or enter into any
               transaction or device which is designed to, or could be expected
               to, result in the disposition by any person at any time in the
               future of) any shares of Common Stock or securities convertible
               into or exchangeable for Common Stock or (2) enter into any swap
               or other derivatives transaction that transfers to another, in
               whole or in part, any of the economic benefits or risks of
               ownership of such shares of Common Stock, whether any such
               transaction described in clause (1) or (2) above is to be settled
               by delivery of Common Stock or other securities, in cash or
               otherwise, in each case for a period of 180 days from the date of
               the Prospectus, without the prior written consent of Lehman
               Brothers Inc. Notwithstanding the foregoing, each person may
               transfer the Common Stock (i) as a bona fide gift or gifts,
               provided that the donee or donees thereof agree to be bound by
               the restrictions set forth herein or (ii) to any trust for the
               direct or indirect benefit of each person or the immediate
               family, provided that the trustee of the trust agrees to be bound
               by the restrictions set forth herein, and provided further that
               any such transfer shall not involve a disposition for value.

                      (j) Prior to the Effective Date, to apply for the
               inclusion of the Stock on the National Market System and to use
               its best efforts to complete that listing, subject only to
               official notice of issuance and evidence of satisfactory
               distribution, prior to the First Delivery Date;

                      (k) To take such steps as shall be necessary to ensure
               that the Company shall not become an "investment company" or
               "controlled by" an investment company" within the meaning of such
               terms under the Investment Company Act of 1940 and the Rules and
               Regulations thereunder.

               6. Expenses. The Company agrees to pay (a) the costs incident to
the authorization, issuance, sale and delivery of the Stock and any taxes
payable in that connection;


                                       12
<PAGE>   13
(b) the costs incident to the preparation, printing and filing under the
Securities Act of the Registration Statement and any amendments and exhibits
thereto; (c) the costs of distributing the Registration Statement as originally
filed and each amendment thereto and any post-effective amendments thereof
(including, in each case, exhibits), any Preliminary Prospectus, the Prospectus
and any amendment or supplement to the Prospectus, all as provided in this
Agreement; (d) the costs of producing and distributing this Agreement and any
other related documents in connection with the offering, purchase, sale and
delivery of the stock; (e) the filing fees incident to securing any required
review by the National Association of Securities Dealers, Inc. of the terms of
sale of the Stock; (f) any applicable listing or other fees; (g) the fees and
expenses of qualifying the Stock under the securities laws of the several
jurisdictions as provided in Section 5 and of preparing, printing and
distributing a Blue Sky Memorandum, which expenses shall not exceed $10,000
(including related fees and expenses of counsel to the Underwriters); (h) all
costs and expenses of the Underwriters, including the fees and disbursements of
counsel for the Underwriters, incident to the offer and sale of shares of the
Stock by the Underwriters to employees and persons having business relationships
with the Company, as described in Section 3; and (i) all other costs and
expenses incident to the performance of the obligations of the Company under
this Agreement; provided that, except as provided in this Section 6 and in
Section 11 the Underwriters shall pay their own costs and expenses, including
the costs and expenses of their counsel, any transfer taxes on the Stock which
they may sell and the expenses of advertising any offering of the Stock made by
the Underwriters.

               7. Conditions of Underwriters' Obligations. The respective
obligations of the Underwriters hereunder are subject to the accuracy, when made
and on each Delivery Date, of the representations and warranties of the Company
contained herein, to the performance by the Company of its obligations
hereunder, and to each of the following additional terms and conditions:

                      (a) The Prospectus shall have been timely filed with the
               Commission in accordance with Section 5(a); no stop order
               suspending the effectiveness of the Registration Statement or any
               part thereof shall have been issued and no proceeding for that
               purpose shall have been initiated or threatened by the
               Commission; and any request of the Commission for inclusion of
               additional information in the Registration Statement or the
               Prospectus or otherwise shall have been complied with.

                      (b) No Underwriter shall have discovered and disclosed to
               the Company on or prior to such Delivery Date that the
               Registration Statement or the Prospectus or any amendment or
               supplement thereto contains an untrue statement of a fact which,
               in the opinion of Latham & Watkins, counsel for the Underwriters,
               is material or omits to state a fact which, in the opinion of
               such counsel, is material and is required to be stated therein or
               is necessary to make the statements therein not misleading.

                      (c) All corporate proceedings and other legal matters
               incident to the authorization, form and validity of this
               Agreement, the Stock, the Registration


                                       13
<PAGE>   14
               Statement and the Prospectus, and all other legal matters
               relating to this Agreement and the transactions contemplated
               hereby shall be reasonably satisfactory in all material respects
               to counsel for the Underwriters, and the Company shall have
               furnished to such counsel all documents and information that they
               may reasonably request to enable them to pass upon such matters.

                      (d) Brobeck, Phleger & Harrison LLP shall have furnished
               to the Representatives its written opinion, as counsel to the
               Company, addressed to the Underwriters and dated such Delivery
               Date, in form and substance reasonably satisfactory to the
               Representatives, to the effect that:

                             (i) The Company has been duly incorporated and is
                      validly existing as a corporation in good standing under
                      the laws of Delaware, is duly qualified to do business and
                      is in good standing as a foreign corporation in each
                      jurisdiction in which its ownership or lease of property
                      or the conduct of its business requires such
                      qualification, except where the failure to so qualify
                      would not in the aggregate have a material adverse effect
                      on the Company, and has all power and authority necessary
                      to own or hold its properties and to conduct the business
                      in which it is engaged; and the Company has no
                      subsidiaries;

                             (ii) The Company has an authorized capitalization
                      as set forth in the section entitled "Capitalization" in
                      the Prospectus, and all of the issued shares of capital
                      stock of the Company (including the shares of Stock being
                      delivered on such Delivery Date) have been duly and
                      validly authorized and issued, are fully paid and
                      non-assessable and conform to the description thereof
                      contained in the Prospectus;

                             (iii) There are no preemptive or other rights to
                      subscribe for or to purchase, nor any restriction upon the
                      voting or transfer of, any shares of the Stock pursuant to
                      the Company's Amended and Restated Articles of
                      Incorporation or Bylaws, or, to such counsel's knowledge,
                      in any agreement or other instrument;

                             (iv) To such counsel's knowledge and other than as
                      set forth in the Prospectus, there are no legal or
                      governmental proceedings pending to which the Company is a
                      party or of which any property or assets of the Company is
                      the subject which are required to be described in the
                      Prospectus by the Securities Act or the Rules and
                      Regulations and, to such counsel's knowledge, no such
                      proceedings are threatened or contemplated by governmental
                      authorities or threatened by others;

                             (v) The Registration Statement was declared
                      effective under the Securities Act as of the date and time
                      specified in such opinion, the Prospectus was filed with
                      the Commission pursuant to the subparagraph of Rule 424(b)
                      of the Rules and Regulations specified in such opinion on
                      the


                                       14
<PAGE>   15
                      date specified therein and, to such counsel's knowledge,
                      no stop order suspending the effectiveness of the
                      Registration Statement has been issued and, to such
                      counsel's knowledge, no proceeding for that purpose is
                      pending or threatened by the Commission;

                             (vi) The Registration Statement and the Prospectus
                      and any further amendments or supplements thereto made by
                      the Company prior to such Delivery Date (other than the
                      financial statements and related schedules therein, as to
                      which such counsel need express no opinion) comply as to
                      form in all material respects with the requirements of the
                      Securities Act and the Rules and Regulations;

                             (vii) To such counsel's knowledge, there are no
                      contracts or other documents which are required to be
                      described in the Prospectus or filed as exhibits to the
                      Registration Statement by the Securities Act or by the
                      Rules and Regulations which have not been described or
                      filed as exhibits to the Registration Statement or
                      incorporated therein by reference as permitted by the
                      Rules and Regulations;

                             (viii) This Agreement has been duly authorized,
                      executed and delivered by the Company;

                             (ix) The issue and sale of the shares of Stock
                      being delivered on such Delivery Date by the Company, the
                      execution, delivery and compliance by the Company with all
                      of the provisions of this Agreement will not, whether with
                      or without the giving of notice or passage of time or
                      both, conflict with or result in a breach or violation of
                      any of the terms or provisions of, or constitute a default
                      under, any indenture, mortgage, deed of trust, loan
                      agreement or other agreement, which done in the aggregate,
                      are material to the Company's business as described in the
                      Prospectus, or instrument known to such counsel to which
                      the Company is a party or by which the Company is bound or
                      to which any of the property or assets of the Company is
                      subject, nor will such actions result in any violation of
                      the provisions of the charter or bylaws of the Company or
                      any statute or any order, rule or regulation known to such
                      counsel of any court or governmental agency or body having
                      jurisdiction over the Company or any of their properties
                      or assets except the securities or Blue Sky laws of the
                      various U.S. states; and, except for the registration of
                      the Stock under the Securities Act and such consents,
                      approvals, authorizations, registrations or qualifications
                      as may be required under the Exchange Act and applicable
                      state securities laws in connection with the purchase and
                      distribution of the Stock by the Underwriters, no consent,
                      approval, authorization or order of, or filing or
                      registration with, any such court or governmental agency
                      or body is required for the execution, delivery and
                      performance of this Agreement, by the Company and the
                      consummation of the transactions contemplated hereby; and


                                       15
<PAGE>   16
                             (x) To such counsel's knowledge, there are no
                      contracts, agreements or understandings between the
                      Company and any person granting such person the right
                      (other than rights which have been waived or satisfied) to
                      require the Company to include such securities in the
                      securities registered pursuant to the Registration
                      Statement with respect to any securities of the Company
                      owned or to be owned by such person. To such counsel's
                      knowledge, except as described in the Prospectus, there
                      are no contracts, agreements, or understandings between
                      the Company and any person granting such person the right
                      to require the Company to register or include securities
                      pursuant to any other registration statement filed by the
                      Company under the Securities Act.

                             (xi) The statements set forth in the Prospectus
                      under the headings "Description of Capital Stock", and
                      "Shares Eligible for Future Sale" and in the Registration
                      Statement under Item 14, to the extent such statements
                      constitute summaries of legal matters are accurate in all
                      material respects.

                             (xii) The statements contained in the Prospectus
                      under the captions "Management--Stock Plans," "Related
                      Party Transactions--Agreements with Officers and
                      Directors," insofar as they purport to constitute
                      summaries of contracts or other agreements, are accurate
                      in all material respects.

               In addition, such counsel may state that it has participated in
               conferences with certain officers and other representatives of
               the Company, its independent public accountants and the
               Underwriters at which the contents of the Registration Statement,
               the Prospectus and related matters were discussed. Such counsel
               may further specify that it is not, however, passing upon, and
               does not assume any responsibility for, and has not independently
               checked or verified, the accuracy, completeness or fairness of
               the information contained in the Registration Statement and the
               Prospectus (other than with respect to opinions (xi) and (xii)
               above). Such counsel shall state, however, that based upon its
               participation as described in the foregoing and its capacity as
               counsel to the Company, (i) it confirms that it has no reason to
               believe that (other than the consolidated financial statements,
               including the notes and schedules thereto and the other financial
               data included therein, as to which it need express no belief) at
               the time the Registration Statement became effective, the
               Registration Statement contained any untrue statement of a
               material fact or omitted to state a material fact required to be
               stated therein or necessary to make the statements therein not
               misleading; and (ii) it shall confirm that it has not reason to
               believe that (except as to financial statements, including the
               notes and schedules thereto, and the other financial data
               included therein, as to which it need express no belief) the
               Prospectus, as of its date of issue or on the date hereof,
               contains any untrue statement of a material fact or omits to
               state a material fact necessary in order to make the statements
               therein, in light of the circumstances under which they were
               made, not misleading. In


                                       16
<PAGE>   17
               addition, such counsel may state that it is not an expert on
               patent issues and they are not passing upon, and do not assume
               any responsibility for, and they have not independently checked
               or verified, the accuracy, completeness or fairness of the
               information contained in the Prospectus with respect to such
               issues.

                      (e) Townsend and Townsend and Crew LLP, shall have
               furnished to the Representatives a written opinion, as
               intellectual property counsel to the Company, addressed to the
               Underwriters and dated such Delivery Date, in form and substance
               reasonably satisfactory to the Representatives, to the effect
               that they serve as intellectual property counsel to the Company
               with respect to the Proprietary Rights, and that:

                             (i) Such counsel is familiar with the technology
                      used by the Company in its business and the manner of its
                      use thereof and has read the Registration Statement and
                      the Prospectus, including particularly the portions of the
                      Registration Statement and the Prospectus under the
                      captions "Risk Factors--Because it is difficult and costly
                      to protect our proprietary rights, we cannot ensure their
                      protection," "Business--Intellectual Property and
                      Technology Licenses," and "Business-- Corporate
                      Collaborations-- Universal GeneTools Collaborations," (the
                      "Patent Information"). Such counsel has considered the
                      statements contained therein, although such counsel has
                      not independently verified the accuracy, completeness or
                      fairness of such statements. Based upon and subject to the
                      foregoing, nothing has come to such counsel's attention,
                      as of the date of the Prospectus and the date hereof, that
                      leads such counsel to believe that the "Patent
                      Information" contains an untrue statement of a material
                      fact or omits to state a material fact in light of the
                      circumstances in which they are made. As of the date of
                      the Prospectus and the date hereof, such counsel has no
                      reason to believe that the "Patent Information" is not in
                      all material respects a fair and accurate summary of the
                      legal matters, documents and proceedings relating thereto.

                             (ii) Attached as Schedule A to such opinion is a
                      list of the Company's U.S. patents and pending U.S. patent
                      applications (the "U.S. Patent Rights") which, to the best
                      of such counsel's knowledge, are owned by the Company, as
                      indicated on such Schedule A. To the best of such
                      counsel's knowledge, where the Company is listed on
                      Schedule A to such opinion as the owner of any U.S. Patent
                      Right, either (a) an assignment from the inventor(s) to
                      the Company has been recorded in the United States Patent
                      and Trademark Office, or (b) the inventor(s) are under
                      obligation of assignment to the Company, and an assignment
                      will be recorded in the United States Patent and Trademark
                      Office. To the best of such counsel's knowledge, there are
                      no claims to any ownership interests or liens on any of
                      the U.S. Patent Rights by any party other than the
                      Company.


                                       17
<PAGE>   18
                             (iii) Attached as Schedule B to such opinion is a
                      list of the Company's non-U.S. patents and pending
                      non-U.S. patent applications (the "Non-U.S. Patent
                      Rights") which, to the best of such counsel's knowledge,
                      are owned by the Company, as indicated on such Schedule B.
                      To the best of such counsel's knowledge, where the Company
                      is listed on Schedule B to such opinion as the owner or
                      co-owner(s) of any Non-U.S. Patent Right, the named
                      inventors of the Non-U.S. Patent Rights have either (a)
                      executed an assignment to the Company, or (b) are under an
                      obligation to execute an assignment to the Company. To the
                      best of such counsel's knowledge, there are no claims to
                      any ownership interests or liens on any of the Non-U.S.
                      Patent Rights by any party other than the Company.

                             (iv) Attached as Schedule C to such opinion is a
                      list of the U.S. and non-U.S. patents and pending patent
                      applications which, to the best of such counsel's
                      knowledge, the Company has licensed the rights to use (the
                      "Licensed Patent Rights"). To the best of such counsel's
                      knowledge, the Licensed Patent Rights cover fields of use
                      necessary to conduct business in the manner described in
                      the Registration Statement and the Prospectus, as
                      indicated on such Schedule C except that licensed patent
                      rights from Scripps do not include Agricultural
                      Biotechnology. To the best of such counsel's knowledge,
                      other than as set forth in the Prospectus, there are no
                      claims by any third parties that the Company lacks
                      adequate rights in any of the Licensed Patent Rights.

                             (v) Such counsel has reviewed portions of certain
                      patent estates, as set forth in Schedules A, B and C of
                      such opinion, and is unaware of any facts that would lead
                      it to believe that: (a) any of the patents are invalid,
                      (b) any patent issued in respect of a patent application
                      would be invalid, or (c) any material defects exist in
                      respect of form in the preparation of filing of any of the
                      patent applications.

                             (vi) To the best of such counsel's knowledge, for
                      each of the U.S. patents applications filed and prosecuted
                      by such counsel reflected in Schedule D to such opinion,
                      the Company has disclosed or intends to disclose to the
                      United States Patent and Trademark Office all information
                      know and believed to be material to patentability under
                      the extant 37 C.F.R. Section 1.56.

                             (vii) Other than the disclosures set forth in the
                      Prospectus, to the best of such counsel's knowledge, the
                      Company has not received any claim of infringement of any
                      patents held by others, and to the best of such counsel's
                      knowledge, there is no pending or threatened action, suit,
                      proceeding or claim by others that the Company is
                      infringing a patent. Except as generally described in the
                      Prospectus, nothing has come to such counsel's attention
                      that has led such counsel to believe that any patents of


                                       18
<PAGE>   19
                      others are infringed by the present or future business of
                      the Company as described in the Prospectus under the
                      caption "Business."

                             (viii) To the best of our knowledge, there are no
                      pending or threatened legal or governmental proceedings
                      relating to the U.S. patents and pending U.S. patent
                      applications reflected in Schedule A, other than
                      proceedings before the United States Patent and Trademark
                      Office that are carried out during the course of
                      prosecution.

                      With respect to the opinions expressed herein, such
                      counsel has assumed the genuineness of all signatures on
                      original, certified or facsimile copies, the authenticity
                      of all items submitted to such counsel as originals and
                      the conformity with originals of all items submitted to us
                      as reproduction or certified copies. In examining
                      documents executed by entities other than the Company,
                      such counsel has assumed that each other entity has the
                      power and authority to execute and deliver, and to perform
                      and observe the provisions of such documents, and the due
                      authorization by each such entity of all requisite action
                      and the due execution and delivery of such documents by
                      each such entity. Such counsel expresses no opinion with
                      regard to the enforceability of any license agreements or
                      assignments nor with regard to intervening assignments.

                      (f) Gray Cary Ware & Freidenrich LLP, shall have furnished
               to the Representatives a written opinion, as special intellectual
               property counsel to the Company, addressed to the Underwriters
               and dated such Delivery Date, in form and substance reasonably
               satisfactory to the Representatives regarding the section of the
               Prospectus entitled "Business-- Corporate Collaborations--Baxter
               CardioVascular Group Strategic Partnership.

                      (g) The Representatives shall have received from Latham &
               Watkins, counsel for the Underwriters, such opinion or opinions,
               dated such Delivery Date, with respect to the issuance and sale
               of the Stock, the Registration Statement, the Prospectus and
               other related matters as the Representatives may reasonably
               require, and the Company shall have furnished to such counsel
               such documents as they reasonably request for the purpose of
               enabling them to pass upon such matters.

                      (h) At the time of execution of this Agreement, the
               Representatives shall have received from Ernst & Young LLP a
               letter, in form and substance satisfactory to the
               Representatives, addressed to the Underwriters and dated the date
               hereof (i) confirming that they are independent public
               accountants within the meaning of the Securities Act and are in
               compliance with the applicable requirements relating to the
               qualification of accountants under Rule 2-01 of Regulation S-X of
               the Commission, (ii) stating, as of the date hereof (or, with
               respect to matters involving changes or developments since the
               respective dates as of which specified financial information is
               given in the Prospectus, as of a date


                                       19
<PAGE>   20
               not more than five days prior to the date hereof), the
               conclusions and findings of such firm with respect to the
               financial information and other matters ordinarily covered by
               accountants' "comfort letters" to underwriters in connection with
               registered public offerings.

                      (i) With respect to the letter of Ernst & Young referred
               to in the preceding paragraph and delivered to the
               Representatives concurrently with the execution of this Agreement
               (the "initial letter"), the Company shall have furnished to the
               Representatives a letter (the "bring-down letter") of such
               accountants, addressed to the Underwriters and dated such
               Delivery Date (i) confirming that they are independent public
               accountants within the meaning of the Securities Act and are in
               compliance with the applicable requirements relating to the
               qualification of accountants under Rule 2-01 of Regulation S-X of
               the Commission, (ii) stating, as of the date of the bring-down
               letter (or, with respect to matters involving changes or
               developments since the respective dates as of which specified
               financial information is given in the Prospectus, as of a date
               not more than five days prior to the date of the bring-down
               letter), the conclusions and findings of such firm with respect
               to the financial information and other matters covered by the
               initial letter and (iii) confirming in all material respects the
               conclusions and findings set forth in the initial letter.

                      (j) The Company shall have furnished to the
               Representatives a certificate, dated such Delivery Date, of its
               Chairman of the Board, its President or a Vice President and its
               chief financial officer stating that:

                             (i) The representations, warranties and agreements
                      of the Company in Section 1 are true and correct as of
                      such Delivery Date; the Company has complied with all its
                      agreements contained herein; and the conditions set forth
                      in Sections 7(a) and 7(l) have been fulfilled; and

                             (ii) They have carefully examined the Registration
                      Statement and the Prospectus and, in their opinion (A) as
                      of the Effective Date, the Registration Statement and
                      Prospectus did not include any untrue statement of a
                      material fact and did not omit to state a material fact
                      required to be stated therein or necessary to make the
                      statements therein not misleading, and (B) since the
                      Effective Date no event has occurred which should have
                      been set forth in a supplement or amendment to the
                      Registration Statement or the Prospectus.

                      (k) The Company shall not have sustained since the date of
               the latest audited financial statements included in the
               Prospectus any loss or interference with its business from fire,
               explosion, flood or other calamity, whether or not covered by
               insurance, or from any labor dispute or court or governmental
               action, order or decree, otherwise than as set forth or
               contemplated in the Prospectus or (ii) since such date there
               shall not have been any change in the capital stock or long-term
               debt of the Company or any change, or any development involving a


                                       20
<PAGE>   21
               prospective change, in or affecting the general affairs,
               management, financial position, stockholders' equity, results of
               operations or prospects of the Company, otherwise than as set
               forth or contemplated in the Prospectus, the effect of which, in
               any such case described in clause (i) or (ii), is, in the
               judgment of the Representatives, so material and adverse as to
               make it impracticable or inadvisable to proceed with the public
               offering or the delivery of the Stock being delivered on such
               Delivery Date on the terms and in the manner contemplated in the
               Prospectus.

                      (l) Subsequent to the execution and delivery of this
               Agreement there shall not have occurred any of the following: (i)
               trading in securities generally on the New York Stock Exchange or
               the American Stock Exchange or in the over-the-counter market,
               shall have been suspended or minimum prices shall have been
               established on any such exchange or such market by the
               Commission, by such exchange or by any other regulatory body or
               governmental authority having jurisdiction, (ii) a banking
               moratorium shall have been declared by Federal or state
               authorities, (iii) the United States shall have become engaged in
               hostilities, there shall have been an escalation in hostilities
               involving the United States or there shall have been a
               declaration of a national emergency or war by the United States
               or (iv) there shall have occurred such a material adverse change
               in general economic, political or financial conditions (or the
               effect of international conditions on the financial markets in
               the United States shall be such) as to make it, in the judgment
               of a majority in interest of the several Underwriters,
               impracticable or inadvisable to proceed with the public offering
               or delivery of the Stock being delivered on such Delivery Date on
               the terms and in the manner contemplated in the Prospectus.

                      (m) The National Market System shall have approved the
               Stock for inclusion, subject only to official notice of issuance
               and evidence of satisfactory distribution.

               All opinions, letters, evidence and certificates mentioned above
or elsewhere in this Agreement shall be deemed to be in compliance with the
provisions hereof only if they are in form and substance reasonably satisfactory
to Latham & Watkins, counsel for the Underwriters.

               8. Indemnification and Contribution.

                      (a) The Company shall indemnify and hold harmless each
               Underwriter, its officers and employees and each person, if any,
               who controls any Underwriter within the meaning of the Securities
               Act, from and against any loss, claim, damage or liability, joint
               or several, or any action in respect thereof (including, but not
               limited to, any loss, claim, damage, liability or action relating
               to purchases and sales of Stock), to which that Underwriter,
               officer, employee or controlling person may become subject, under
               the Securities Act or otherwise, insofar as such loss, claim,
               damage, liability or action arises out of, or is based upon, (i)
               any untrue statement or alleged untrue statement of a material
               fact


                                       21
<PAGE>   22
               contained (A) in any Preliminary Prospectus, the Registration
               Statement or the Prospectus or in any amendment or supplement
               thereto, (B) in any blue sky application or other document
               prepared or executed by the Company (or based on any written
               information furnished by the Company) specifically for the
               purpose of qualifying any or all of the Stock under the
               securities laws of any state or other jurisdiction (any such
               application, document, or information being hereinafter called a
               "Blue Sky Application"), or (C) in any materials or information
               provided to investors by, or with the approval of, the Company in
               connection with the marketing of the offering of the Stock
               ("Marketing Materials"), including any roadshow or investor
               presentations made to investors by the Company (whether in person
               or electronically), (ii) the omission or alleged omission to
               state in any Preliminary Prospectus, the Registration Statement
               or the Prospectus, or in any amendment or supplement thereto, or
               in any Blue Sky Application or Marketing Materials any material
               fact required to be stated therein or necessary to make the
               statements therein not misleading or (iii) any act or failure to
               act or any alleged act or failure to act by any Underwriter in
               connection with, or relating in any manner to, the Stock or the
               offering contemplated hereby, and which is included as part of or
               referred to in any loss, claim, damage, liability or action
               arising out of or based upon matters covered by clause (i) or
               (ii) above (provided that the Company shall not be liable under
               this clause (iii) to the extent that it is determined in a final
               judgment by a court of competent jurisdiction that such loss,
               claim, damage, liability or action resulted directly from any
               such acts or failures to act undertaken or omitted to be taken by
               such Underwriter through its gross negligence or willful
               misconduct), and shall reimburse each Underwriter and each such
               officer, employee or controlling person promptly upon demand for
               any legal or other expenses reasonably incurred by that
               Underwriter, officer, employee or controlling person in
               connection with investigating or defending or preparing to defend
               against any such loss, claim, damage, liability or action as such
               expenses are incurred; provided, however, that the Company shall
               not be liable in any such case to the extent that any such loss,
               claim, damage, liability or action arises out of, or is based
               upon, any untrue statement or alleged untrue statement or
               omission or alleged omission made in any Preliminary Prospectus,
               the Registration Statement or the Prospectus, or in any such
               amendment or supplement, in reliance upon and in conformity with
               written information concerning such Underwriter furnished to the
               Company through the Representatives by or on behalf of any
               Underwriter specifically for inclusion therein which information
               consists solely of the information specified in Section 8(e). The
               foregoing indemnity agreement is in addition to any liability
               which the Company may otherwise have to any Underwriter or to any
               officer, employee or controlling person of that Underwriter.

                      (b) Each Underwriter, severally and not jointly, shall
               indemnify and hold harmless the Company, its officers and
               employees, each of its directors and each person, if any, who
               controls the Company within the meaning of the Securities Act,
               from and against any loss, claim, damage or liability, joint or
               several, or any action in respect thereof, to which the Company
               or any such


                                       22
<PAGE>   23
               director, officer or controlling person may become subject, under
               the Securities Act or otherwise, insofar as such loss, claim,
               damage, liability or action arises out of, or is based upon, (i)
               any untrue statement or alleged untrue statement of a material
               fact contained (A) in any Preliminary Prospectus, the
               Registration Statement or the Prospectus or in any amendment or
               supplement thereto, or (B) in any Blue Sky Application or (ii)
               the omission or alleged omission to state in any Preliminary
               Prospectus, the Registration Statement or the Prospectus, or in
               any amendment or supplement thereto, or in any Blue Sky
               Application any material fact required to be stated therein or
               necessary to make the statements therein not misleading, but in
               each case only to the extent that the untrue statement or alleged
               untrue statement or omission or alleged omission was made in
               reliance upon and in conformity with written information
               concerning such Underwriter furnished to the Company through the
               Representatives by or on behalf of that Underwriter specifically
               for inclusion therein, and shall reimburse the Company and any
               such director, officer or controlling person for any legal or
               other expenses reasonably incurred by the Company or any such
               director, officer or controlling person in connection with
               investigating or defending or preparing to defend against any
               such loss, claim, damage, liability or action as such expenses
               are incurred. The foregoing indemnity agreement is in addition to
               any liability which any Underwriter may otherwise have to the
               Company or any such director, officer, employee or controlling
               person.

                      (c) Promptly after receipt by an indemnified party under
               this Section 8 of notice of any claim or the commencement of any
               action, the indemnified party shall, if a claim in respect
               thereof is to be made against the indemnifying party under this
               Section 8, notify the indemnifying party in writing of the claim
               or the commencement of that action; provided, however, that the
               failure to notify the indemnifying party shall not relieve it
               from any liability which it may have under this Section 8 except
               to the extent it has been materially prejudiced by such failure
               and, provided further, that the failure to notify the
               indemnifying party shall not relieve it from any liability which
               it may have to an indemnified party otherwise than under this
               Section 8. If any such claim or action shall be brought against
               an indemnified party, and it shall notify the indemnifying party
               thereof, the indemnifying party shall be entitled to participate
               therein and, to the extent that it wishes, jointly with any other
               similarly notified indemnifying party, to assume the defense
               thereof with counsel reasonably satisfactory to the indemnified
               party. After notice from the indemnifying party to the
               indemnified party of its election to assume the defense of such
               claim or action, the indemnifying party shall not be liable to
               the indemnified party under this Section 8 for any legal or other
               expenses subsequently incurred by the indemnified party in
               connection with the defense thereof other than reasonable costs
               of investigation; provided, however, that the Representatives
               shall have the right to employ counsel to represent jointly the
               Representatives and those other Underwriters and their respective
               officers, employees and controlling persons who may be subject to
               liability arising out of any claim in respect of which indemnity
               may be sought by the Underwriters


                                       23
<PAGE>   24
               against the Company under this Section 8 if, in the reasonable
               judgment of the Representatives, it is advisable for the
               Representatives and those Underwriters, officers, employees and
               controlling persons to be jointly represented by separate
               counsel, and in that event the fees and expenses of such separate
               counsel shall be paid by the Company. No indemnifying party shall
               (i) without the prior written consent of the indemnified parties
               (which consent shall not be unreasonably withheld), settle or
               compromise or consent to the entry of any judgment with respect
               to any pending or threatened claim, action, suit or proceeding in
               respect of which indemnification or contribution may be sought
               hereunder (whether or not the indemnified parties are actual or
               potential parties to such claim or action) unless such
               settlement, compromise or consent includes an unconditional
               release of each indemnified party from all liability arising out
               of such claim, action, suit or proceeding, or (ii) be liable for
               any settlement of any such action effected without its written
               consent (which consent shall not be unreasonably withheld), but
               if settled with the consent of the indemnifying party or if there
               be a final judgment of the plaintiff in any such action, the
               indemnifying party agrees to indemnify and hold harmless any
               indemnified party from and against any loss or liability by
               reason of such settlement or judgment.

                      (d) If the indemnification provided for in this Section 8
               shall for any reason be unavailable to or insufficient to hold
               harmless an indemnified party under Section 8(a) or 8(b) in
               respect of any loss, claim, damage or liability, or any action in
               respect thereof, referred to therein, then each indemnifying
               party shall, in lieu of indemnifying such indemnified party,
               contribute to the amount paid or payable by such indemnified
               party as a result of such loss, claim, damage or liability, or
               action in respect thereof, (i) in such proportion as shall be
               appropriate to reflect the relative benefits received by the
               Company on the one hand and the Underwriters on the other from
               the offering of the Stock or (ii) if the allocation provided by
               clause (i) above is not permitted by applicable law, in such
               proportion as is appropriate to reflect not only the relative
               benefits referred to in clause (i) above but also the relative
               fault of the Company on the one hand and the Underwriters on the
               other with respect to the statements or omissions which resulted
               in such loss, claim, damage or liability, or action in respect
               thereof, as well as any other relevant equitable considerations.
               The relative benefits received by the Company on the one hand and
               the Underwriters on the other with respect to such offering shall
               be deemed to be in the same proportion as the total net proceeds
               from the offering of the Stock purchased under this Agreement
               (before deducting expenses) received by the Company, on the one
               hand, and the total underwriting discounts and commissions
               received by the Underwriters with respect to the shares of the
               Stock purchased under this Agreement, on the other hand, bear to
               the total gross proceeds from the offering of the shares of the
               Stock under this Agreement, in each case as set forth in the
               table on the cover page of the Prospectus. The relative fault
               shall be determined by reference to whether the untrue or alleged
               untrue statement of a material fact or omission or alleged
               omission to state a material fact relates to information supplied
               by the Company


                                       24
<PAGE>   25
               or the Underwriters, the intent of the parties and their relative
               knowledge, access to information and opportunity to correct or
               prevent such statement or omission. The Company and the
               Underwriters agree that it would not be just and equitable if
               contributions pursuant to this Section were to be determined by
               pro rata allocation (even if the Underwriters were treated as one
               entity for such purpose) or by any other method of allocation
               which does not take into account the equitable considerations
               referred to herein. The amount paid or payable by an indemnified
               party as a result of the loss, claim, damage or liability, or
               action in respect thereof, referred to above in this Section
               shall be deemed to include, for purposes of this Section 8(d),
               any legal or other expenses reasonably incurred by such
               indemnified party in connection with investigating or defending
               any such action or claim. Notwithstanding the provisions of this
               Section 8(d), no Underwriter shall be required to contribute any
               amount in excess of the amount by which the total price at which
               the Stock underwritten by it and distributed to the public was
               offered to the public exceeds the amount of any damages which
               such Underwriter has otherwise paid or become liable to pay by
               reason of any untrue or alleged untrue statement or omission or
               alleged omission. No person guilty of fraudulent
               misrepresentation (within the meaning of Section 11(f) of the
               Securities Act) shall be entitled to contribution from any person
               who was not guilty of such fraudulent misrepresentation. The
               Underwriters' obligations to contribute as provided in this
               Section 8(d) are several in proportion to their respective
               underwriting obligations and not joint.

                      (e) The Underwriters severally confirm and the Company
               acknowledges that the statements with respect to the public
               offering of the Stock by the Underwriters set forth on the cover
               page of, the legend concerning over-allotments on the inside
               front cover page of and the concession and reallowance figures
               appearing under the caption "Underwriting" in, the Prospectus are
               correct and constitute the only information concerning such
               Underwriters furnished in writing to the Company by or on behalf
               of the Underwriters specifically for inclusion in the
               Registration Statement and the Prospectus.

               9. Defaulting Underwriters. If, on either Delivery Date, any
Underwriter defaults in the performance of its obligations under this Agreement,
the remaining non-defaulting Underwriters shall be obligated to purchase the
Stock which the defaulting Underwriter agreed but failed to purchase on such
Delivery Date in the respective proportions which the number of shares of the
Firm Stock set forth opposite the name of each remaining non-defaulting
Underwriter in Schedule 1 hereto bears to the total number of shares of the Firm
Stock set forth opposite the names of all the remaining non-defaulting
Underwriters in Schedule 1 hereto; provided, however, that the remaining
non-defaulting Underwriters shall not be obligated to purchase any of the Stock
on such Delivery Date if the total number of shares of the Stock which the
defaulting Underwriter or Underwriters agreed but failed to purchase on such
date exceeds 9.09% of the total number of shares of the Stock to be purchased on
such Delivery Date, and any remaining non-defaulting Underwriter shall not be
obligated to purchase more than 110% of the number of shares of the Stock which
it agreed to purchase on such Delivery Date pursuant to the terms of Section 3.
If the


                                       25
<PAGE>   26
foregoing maximums are exceeded, the remaining non-defaulting Underwriters, or
those other Underwriters satisfactory to the Representatives who so agree, shall
have the right, but shall not be obligated, to purchase, in such proportion as
may be agreed upon among them, all the Stock to be purchased on such Delivery
Date. If the remaining Underwriters or other underwriters satisfactory to the
Representatives do not elect to purchase the shares which the defaulting
Underwriter or Underwriters agreed but failed to purchase on such Delivery Date,
this Agreement (or, with respect to the Second Delivery Date, the obligation of
the Underwriters to purchase, and of the Company to sell, the Option Stock)
shall terminate without liability on the part of any non-defaulting Underwriter
or the Company, except that the Company will continue to be liable for the
payment of expenses to the extent set forth in Sections 6 and 11. As used in
this Agreement, the term "Underwriter" includes, for all purposes of this
Agreement unless the context requires otherwise, any party not listed in
Schedule 1 hereto who, pursuant to this Section 9, purchases Firm Stock which a
defaulting Underwriter agreed but failed to purchase.

               Nothing contained herein shall relieve a defaulting Underwriter
of any liability it may have to the Company for damages caused by its default.
If other underwriters are obligated or agree to purchase the Stock of a
defaulting or withdrawing Underwriter, either the Representatives or the Company
may postpone the Delivery Date for up to seven full business days in order to
effect any changes that in the opinion of counsel for the Company or counsel for
the Underwriters may be necessary in the Registration Statement, the Prospectus
or in any other document or arrangement.

               10. Termination. The obligations of the Underwriters hereunder
may be terminated by the Representatives by notice given to and received by the
Company prior to delivery of and payment for the Firm Stock if, prior to that
time, any of the events described in Sections 7(k) or 7(l), shall have occurred
or if the Underwriters shall decline to purchase the Stock for any reason
permitted under this Agreement.

               11. Reimbursement of Underwriters' Expenses. If (a) the Company
shall fail to tender the Stock for delivery to the Underwriters by reason of any
failure, refusal or inability on the part of the Company to perform any
agreement on its part to be performed, or because any other condition of the
Underwriters' obligations hereunder required to be fulfilled by the Company is
not fulfilled, the Company will reimburse the Underwriters for all reasonable
out-of-pocket expenses (including fees and disbursements of counsel) incurred by
the Underwriters in connection with this Agreement and the proposed purchase of
the Stock, and upon demand the Company shall pay the full amount thereof to the
Representatives. If this Agreement is terminated pursuant to Section 9 by reason
of the default of one or more Underwriters, the Company shall not be obligated
to reimburse any defaulting Underwriter on account of those expenses.

               12. Notices, etc. All statements, requests, notices and
agreements hereunder shall be in writing, and:

                      (a) if to the Underwriters, shall be delivered or sent by
               mail, telex or facsimile transmission to Lehman Brothers Inc.,
               Three World Financial Center, New York, New York 10285,
               Attention: Syndicate Department (Fax: 212-526-


                                       26
<PAGE>   27
               6588), with a copy to Latham & Watkins, 650 Town Center Drive,
               Costa Mesa, CA 92626, Attention: William J. Cernius (Fax:
               714-755-8290), and, in the case of any notice pursuant to Section
               8(d), to the Director of Litigation, Office of the General
               Counsel, Lehman Brothers Inc., 3 World Financial Center, 10th
               Floor, New York, NY 10285;

                      (b) if to the Company shall be delivered or sent by mail,
               telex or facsimile transmission to the address of the Company set
               forth in the Registration Statement, Attention: Edward O.
               Lanphier II (Fax: 510-236-8951);

provided, however, that any notice to an Underwriter pursuant to Section 8(d)
shall be delivered or sent by mail, telex or facsimile transmission to such
Underwriter at its address set forth in its acceptance telex to the
Representatives, which address will be supplied to any other party hereto by the
Representatives upon request. Any such statements, requests, notices or
agreements shall take effect at the time of receipt thereof. The Company shall
be entitled to act and rely upon any request, consent, notice or agreement given
or made on behalf of the Underwriters by Lehman Brothers Inc. on behalf of the
Representatives.

               13. Persons Entitled to Benefit of Agreement. This Agreement
shall inure to the benefit of and be binding upon the Underwriters, the Company
and their respective successors. This Agreement and the terms and provisions
hereof are for the sole benefit of only those persons, except that (A) the
representations, warranties, indemnities and agreements of the Company contained
in this Agreement shall also be deemed to be for the benefit of the person or
persons, if any, who control any Underwriter within the meaning of Section 15 of
the Securities Act and (B) the indemnity agreement of the Underwriters contained
in Section 8(b) of this Agreement shall be deemed to be for the benefit of
directors of the Company, officers of the Company who have signed the
Registration Statement and any person controlling the Company within the meaning
of Section 15 of the Securities Act. Nothing in this Agreement is intended or
shall be construed to give any person, other than the persons referred to in
this Section 13, any legal or equitable right, remedy or claim under or in
respect of this Agreement or any provision contained herein.

               14. Survival. The respective indemnities, representations,
warranties and agreements of the Company and the Underwriters contained in this
Agreement or made by or on behalf of them, respectively, pursuant to this
Agreement, shall survive the delivery of and payment for the Stock and shall
remain in full force and effect, regardless of any investigation made by or on
behalf of any of them or any person controlling any of them.

               15. Definition of the Terms "Business Day" and "Subsidiary". For
purposes of this Agreement, (a) "business day" means each Monday, Tuesday,
Wednesday, Thursday or Friday which is not a day on which banking institutions
in New York are generally authorized or obligated by law or executive order to
close and (b) "subsidiary" has the meaning set forth in Rule 405 of the Rules
and Regulations .


                                       27
<PAGE>   28
               16. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF NEW YORK WITHOUT REGARD TO PRINCIPLES
OF CONFLICTS OF LAWS.

               Each party irrevocably agrees that any legal suit, action or
proceeding arising out of or based upon this Agreement or the transactions
contemplated hereby ("Related Proceedings") may be instituted in the federal
courts of the United States of America located in the City of New York or the
courts of the State of New York in each case located in the Borough of Manhattan
in the City of New York (collectively, the "Specified Courts"), and irrevocably
submits to the exclusive jurisdiction (except for proceedings instituted in
regard to the enforcement of a judgment of any such court (a "Related
Judgment"), as to which such jurisdiction is non-exclusive) of such courts in
any such suit, action or proceeding. The parties further agree that service of
any process, summons, notice or document by mail to such party's address set
forth above shall be effective service of process for any lawsuit, action or
other proceeding brought in any such court. The parties hereby irrevocably and
unconditionally waive any objection to the laying of venue of any lawsuit,
action or other proceeding in the Specified Courts, and hereby further
irrevocably and unconditionally waive and agree not to plead or claim in any
such court that any such lawsuit, action or other proceeding brought in any such
court has been brought in an inconvenient forum.

               17. Counterparts. This Agreement may be executed in one or more
counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.

               18. Headings. The headings herein are inserted for convenience of
reference only and are not intended to be part of, or to affect the meaning or
interpretation of, this Agreement.


                                       28
<PAGE>   29
               If the foregoing correctly sets forth the agreement the Company
and the Underwriters, please indicate your acceptance in the space provided for
that purpose below.

                                            Very truly yours,

                                            SANGAMO BIOSCIENCES, INC.,

                                            By
                                               ---------------------------------
                                               Edward O. Lanphier
                                               President and Chief Executive
                                                  Officer


Accepted:

LEHMAN BROTHERS INC.
CHASE SECURITIES INC.
ING BARINGS LLC
WILLIAM BLAIR & COMPANY, LLC
NATIONAL FINANCIAL SERVICES CORPORATION
For themselves and as Representatives
of the several Underwriters named
in Schedule 1 hereto

        By LEHMAN BROTHERS INC.

        By
           -------------------------------------
           Authorized Representative


<PAGE>   30
                                   SCHEDULE 1

<TABLE>
<CAPTION>
                                                                             Number of
Underwriters                                                                   Shares
- ------------                                                                ------------
<S>                                                                         <C>
Lehman Brothers Inc...................................................
Chase Securities Inc..................................................
ING Barings LLC.......................................................
William Blair & Company, L.L.C........................................
Fidelity Capital Markets, a division of
       National Financial Services Corporation........................
                                                                             ---------
Total
                                                                             =========
</TABLE>


<PAGE>   1

                                                                     EXHIBIT 3.1

                          SEVENTH AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                            SANGAMO BIOSCIENCES, INC.
                             A DELAWARE CORPORATION

        Sangamo BioSciences, Inc., a corporation organized and existing under
the General Corporation law of the State of Delaware (the "Corporation") does
hereby certify:

        FIRST: The name of the Corporation is Sangamo BioSciences, Inc.

        SECOND: The Original Certificate of Incorporation of said Corporation
was filed with the Secretary of State of Delaware on June 22, 1995.

        THIRD: The Second Amended and Restated Certificate of Incorporation of
said Corporation was filed with the Secretary of State of Delaware on June 21,
1996. The Third Amended and Restated Certificate of Incorporation of said
Corporation was filed with the Secretary of State of Delaware on October 31,
1997. The Fourth Amended and Restated Certificate of Incorporation of said
Corporation was filed with the Secretary of State of Delaware on December 11,
1997. The Fifth Amended and Restated Certificate of Incorporation of said
Corporation was filed with the Secretary of State of Delaware on August 19,
1999. The Certificate of Amendment of the Fifth Amended and Restated Certificate
of Incorporation was filed with the Secretary of State of Delaware on November
4, 1999. The Sixth Amended and Restated Certificate of said Corporation was
filed with the Secretary of State of Delaware on March ___, 2000.

        FOURTH: The Seventh Amended and Restated Certificate of Incorporation of
said Corporation has been duly adopted in accordance with Sections 245 and 242
of the General Corporation Law of the State of Delaware by the directors and
stockholders of the Corporation.

        FIFTH: The Sixth Amended and Restated Certificate of Incorporation of
said corporation shall be amended and restated to read in full as follows:



                                    ARTICLE I

                                      NAME

            The name of the Corporation is Sangamo BioSciences, Inc.


<PAGE>   2

                                   ARTICLE II

                                REGISTERED OFFICE

        The address of the registered office of the Corporation in the State of
Delaware is Corporation Trust Center, 1209 Orange Street, City of Wilmington,
County of New Castle, Delaware 19801 and the name of the registered agent at
that address is the Corporation Trust Company.



                                   ARTICLE III

                                   POWERS/TERM

        The purpose of the Corporation is to engage in any lawful act or
activity for which a corporation may be organized under the General Corporation
Law. The Corporation is to have perpetual existence.



                                   ARTICLE IV

                                  CAPITAL STOCK

        A. Classes of Stock. The total number of shares of stock which the
Corporation shall have authority to issue is eighty-five million (85,000,000),
consisting of five million (5,000,000) shares of Preferred Stock, par value
$.001 per share (the "Preferred Stock"), and eighty million (80,000,000) shares
of Common Stock, par value $.001 per share (the "Common Stock").

        B. Preferred Stock. The Preferred Stock may be issued from time to time
in one or more series. The Board of Directors is hereby authorized to provide
for the issuance of shares of Preferred Stock in one or more series and, by
filing a certificate pursuant to the applicable law of the State of Delaware
(the "Preferred Stock Designation"), to establish from time to time the number
of shares to be included in each such series, and to fix the designation,
powers, preferences and rights of the shares of each such series and the
qualifications, limitations and restrictions thereof. The authority of the Board
of Directors with respect to each series shall include, but not be limited to,
determination of the following:

              (1) The designation of the series, which may be by distinguishing
number, letter or title.

              (2) The number of shares of the series, which number the Board of
Directors may thereafter (except where otherwise provided in the Preferred Stock
Designation) increase or decrease (but not below the number of shares thereof
then outstanding).



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<PAGE>   3

              (3) The amounts payable on, and the preferences, if any, of shares
of the series in respect of dividends, and whether such dividends, if any, shall
be cumulative or noncumulative.

              (4) Dates at which dividends, if any, shall be payable.

              (5) The redemption rights and price or prices, if any, for shares
of the series.

              (6) The terms and amount of any sinking funds provided for the
purchase or redemption of shares of the series.

              (7) The amounts payable on, and the preferences, if any, of shares
of the series in the event of any voluntary or involuntary liquidation,
dissolution or winding up of the affairs of the Corporation.

              (8) Whether the shares of the series shall be convertible into or
exchangeable for shares of any other class or series, or any other security, of
the Corporation or any other corporation, and, if so, the specification of such
other class or series or such other security, the conversion or exchange price
or prices or rate or rates, any adjustments thereof, the date or dates at which
such shares shall be convertible or exchangeable and all other terms and
conditions upon which such conversion or change may be made.

              (9) Restrictions on the issuance of shares of the same series or
of any other class or series.

              (10) The voting rights, if any, of the holders of shares of the
series.

        C. Common Stock; Voting. The Common Stock shall be subject to the
express terms of the Preferred Stock and any series thereof. Except as may
otherwise be provided in this Certificate of Incorporation, in a Preferred Stock
Designation or by applicable law, the holders of shares of Common Stock shall be
entitled to one vote for each such share upon all questions presented to the
stockholders, the Common Stock shall have the exclusive right to vote for the
election of directors and for all other purposes, and holders of Preferred Stock
shall not be entitled to vote at or receive notice of any meeting of
stockholders.

        The number of shares of authorized Common Stock may be increased or
decreased (but not below the number then outstanding) by the affirmative vote of
the holders of a majority in voting power of the outstanding shares of capital
stock of the Corporation entitled to vote thereon, voting together as a single
class notwithstanding the provisions of Section 242(b)(2) of the General
Corporation Law of the State of Delaware.

        The Corporation shall be entitled to treat the person in whose name any
share of its stock is registered as the owner thereof for all purposes and shall
not be bound to recognize any equitable or other claim to, or interest in, such
share on the part of any other person whether or not the Corporation shall have
notice thereof, except as expressly provided by applicable law.



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<PAGE>   4

                                    ARTICLE V

                                    DIRECTORS

        The number of directors of the Corporation shall be determined by
resolution of the Board of Directors.

        Elections of directors not be by written ballot unless the Bylaws of the
Corporation shall so provide. Advance notice of stockholders nominations for the
election of directors and of any other business to be brought before any meeting
of the stockholders shall be given in the manner provided in the Bylaws of this
Corporation.

        At each annual meeting of stockholders, directors of the Corporation
shall be elected to hold office until the expiration of the term for which they
are elected, or until their successors have been duly elected and qualified;
except that if any such election shall not be so held, such election shall take
place at stockholder's meeting called and held in accordance with General
Corporation Law of the State of Delaware.

        Vacancies occurring on the Board of Directors for any reason may be
filled by vote of a majority of the remaining members of the Board of Directors,
even if less than a quorum, at any meeting of the Board of Directors. A person
so elected by the Board of Directors to fill a vacancy shall hold office for the
remainder of the full term of the director for which the vacancy was created or
occurred and until such director's successor shall have been duly elected and
qualified. A director or the entire Board of Directors may be removed from
office at any time only for cause by the affirmative vote of the holders of a
majority of the outstanding shares of voting stock of the Corporation entitled
to vote in an election of directors.



                                   ARTICLE VI

                              STOCKHOLDER MEETINGS

        Meetings of stockholders may be held within or without the State of
Delaware, as the bylaws may provide. Special meetings of stockholders for any
purpose may be called only by the Board of Directors. The books of the
Corporation may be kept (subject to any provision contained in the statutes)
outside the State of Delaware at such place or places as may be designated from
time to time by the Board of Directors or in the bylaws of the Corporation. The
stockholders of the Corporation may not take any action by written consent in
lieu of a meeting.



                                   ARTICLE VII

                       LIMITATION OF DIRECTORS' LIABILITY

        A director of the Corporation shall not be liable to the Corporation or
its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent such exemption from liability or limitation
thereof is not permitted under the General



                                       4
<PAGE>   5

Corporation Law of the State of Delaware as the same exists or may hereafter be
amended. Any amendment, modification or repeal of the foregoing sentence shall
not adversely affect any right or protection of a director of the Corporation
hereunder in respect of any act or omission occurring prior to the time of such
amendment, modification or repeal. If the General Corporation Law of the State
of Delaware is amended after approval by the stockholders of this ARTICLE VII to
authorize corporate action further eliminating or limiting the personal
liability of directors, then the liability of a director shall be eliminated or
limited to the fullest extent permitted by the General Corporation Law of the
State of Delaware, as so amended.



                                  ARTICLE VIII

                                 INDEMNIFICATION

        A. Right to Indemnification. The Corporation shall indemnify and hold
harmless, to the fullest extent permitted by applicable law as it presently
exists or may hereafter be amended, any person (a "Covered Person") who was or
is made or is threatened to be made a party or is otherwise involved in any
action, suit or proceeding, whether civil, criminal, administrative or
investigative (a "proceeding"), by reason of the fact that he is or was or has
agreed to become, or a person for whom he is the legal representative, is or was
or has agreed to become a director of the Corporation or, while a director of
the Corporation, is or was serving at the request of the Corporation as a
director, officer, employee or agent of another corporation or of a partnership,
joint venture, trust, enterprise or nonprofit entity, including service with
respect to employee benefit plans, against all liability and loss suffered and
expenses (including attorneys' fees) reasonably incurred by such Covered Person.
Notwithstanding the preceding sentence, except as otherwise provided in this
Article VIII, the Corporation shall be required to indemnify a Covered Person in
connection with a proceeding (or part thereof) commenced by such Covered Person
only if the commencement of such proceeding (or part thereof) by the Covered
Person was authorized by the Board of Directors of the Corporation. The rights
to indemnification provided herein shall continue with respect to a Covered
Person notwithstanding that such Covered Person ceases to be a director, officer
or other employee or agent of the Corporation.

        B. Prepayment of Expenses. The Corporation shall pay the expenses
(including attorneys' fees) incurred by a Covered Person in defending any
proceeding in advance of its final disposition, provided, however, that, to the
extent required by law, such payment of expenses in advance of the final
disposition of the proceeding shall be made only upon receipt of an undertaking
by the Covered Person to repay all amounts advanced if it should be ultimately
determined that the Covered Person is not entitled to be indemnified under this
Article VIII or otherwise.

        C. Claims. If a claim for indemnification or advancement of expenses
under this Article VIII is not paid in full within thirty days after a written
claim therefor by the Covered Person has been received by the Corporation, the
Covered Person may file suit to recover the unpaid amount of such claim and, if
successful in whole or in part, shall be entitled to be paid the expense of
prosecuting such claim. In any such action the Corporation shall have the burden
of



                                       5
<PAGE>   6

proving that the Covered Person is not entitled to the requested indemnification
or advancement of expenses under applicable law.

        D. Nonexclusivity of Rights. The rights conferred on any Covered Person
by this Article VIII shall not be exclusive of any other rights which such
Covered Person may have or hereafter acquire under any statute, provision of the
certificate of incorporation, the bylaws, agreement, vote of stockholders or
disinterested directors or otherwise. The Corporation may, to the extent
authorized from time to time by its Board of Directors, grant indemnification
rights to other employees or agents of the Corporation or other persons serving
the Corporation and such rights may be equivalent to, or greater or less than,
those provided herein.

        E. Other Sources. The Corporation's obligation, if any, to indemnify or
to advance expenses to any Covered person who was or is serving at its request
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust, enterprise or nonprofit entity shall be reduced by any
amount such Covered Person may collect as indemnification or advancement of
expenses from such other corporation, partnership, joint venture, trust,
enterprise or non-profit enterprise. The Corporation shall have the power to
purchase and maintain insurance on behalf of any person who is or was a director
officer, employee or agent of the Corporation, or is or was serving at the
request of the Corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against any
liability asserted against and incurred by such person in any such capacity, or
arising out of such person's status as such.

        F. Amendment or Repeal. Any repeal or modification of the foregoing
provisions of this Article VIII shall not adversely affect any right or
protection hereunder of any Covered Person in respect of any act or omission
occurring prior to the time of such repeal or modification.

        G. Other Indemnification and Prepayment of Expenses. This Article VIII
shall not limit the right to the Corporation to the extent and in the manner
permitted by law, to indemnify and to advance expenses to persons other than
Covered Persons when and as authorized by appropriate corporate action.



                                   ARTICLE IX

                               AMENDMENT OF BYLAWS

        In furtherance of and not in limitation of powers conferred by statute,
the Board of Directors of the Corporation is expressly authorized to adopt,
repeal, alter, amend and rescind the bylaws of the Corporation by vote of a
majority of the Board of Directors.



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<PAGE>   7

                                    ARTICLE X

                    AMENDMENT OF CERTIFICATE OF INCORPORATION

        The Corporation reserves the right to amend, alter, change or repeal any
provision contained in this Amended and Restated Certificate of Incorporation,
in the manner now or hereafter prescribed by statute and this Amended and
Restated Certificate of Incorporation, and all rights conferred upon
stockholders herein are granted subject to this reservation.

                                      * * *


        FOURTH: That said amendments were duly adopted in accordance with the
provisions of Sections 242 and 245 of the General Corporation Law.



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<PAGE>   8

        IN WITNESS WHEREOF, this Amended and Restated Certificate of
Incorporation has been signed this ____ day of March, 2000.



                                       _______________________________
                                       Edward O. Lanphier II
                                       President, Chief Executive Officer
                                       and Chief Financial Officer


                                       8


<PAGE>   1

                                                                     EXHIBIT 3.2

                          AMENDED AND RESTATED BY-LAWS
                                       OF
                            SANGAMO BIOSCIENCES, INC.


                                    ARTICLE I

                     CERTIFICATE OF INCORPORATION AND BYLAWS


              Section 1. These By-Laws are subject to the Certificate of
Incorporation of the Corporation, as amended to date. In these By-Laws,
references to law, the Certificate of Incorporation and By-Laws mean the law,
the provisions of the Certificate of Incorporation and the By-Laws as from time
to time in effect.


                                   ARTICLE II

                                     OFFICES


              Section 1. The registered office of the Corporation in the State
of Delaware shall be Corporation Trust Center, 1209 Orange Street, City of
Wilmington, County of New Castle, Delaware 19801 and the name of the registered
agent at that address is The Corporation Trust Company.


              Section 2. The Corporation may also have offices at such other
places both within and without the State of Delaware as the Board of Directors
may from time to time determine or the business of the Corporation may require.



                                   ARTICLE III

                            MEETINGS OF STOCKHOLDERS


              Section 1. All meetings of the stockholders for the election of
directors shall be held at such place as may be fixed from time to time by the
Board of Directors, or at such other place either within or without the State of
Delaware as shall be designated from time to time by the Board of Directors and
stated in the notice of the meeting. Meetings of stockholders for any other
purpose may be held at such time and place, within or without the State of
Delaware, as shall be stated in the notice of the meeting or in a duly executed
waiver of notice thereof.

              Section 2. Annual meetings of stockholders shall be held at such
date and time as shall be designated from time to time by the Board of Directors
and stated in the notice


<PAGE>   2

of the meeting, at which they shall elect by a plurality vote the directors to
be elected at such meeting, and transact such other business as may properly be
brought before the meeting.

              Section 3. Written notice of the annual meeting stating the place,
date and hour of the meeting shall be given to each stockholder entitled to vote
at such meeting not fewer than ten (10) nor more than sixty (60) days before the
date of the meeting.

              Section 4. The officer who has charge of the stock ledger of the
Corporation shall prepare and make, at least ten (10) days before every meeting
of stockholders, a complete list of the stockholders entitled to vote at the
meeting, arranged in alphabetical order, and showing the address of each
stockholder and the number of shares registered in the name of each stockholder.
Such list shall be open to the examination of any stockholder, for any purpose
germane to the meeting, during ordinary business hours, for a period of at least
ten (10) days prior to the meeting, either at a place within the city where the
meeting is to be held, which place shall be specified in the notice of the
meeting, or, if not so specified, at the place where the meeting is to be held.
The list shall also be produced and kept at the time and place of the meeting
during the whole time thereof, and may be inspected by any stockholder who is
present.

              Section 5. Special meetings of the stockholders, for any purpose
or purposes, unless otherwise prescribed by statute or by the Certificate of
Incorporation, may be called by the Chairman of the Board or President and shall
be called by the Chairman of the Board, the President or Secretary at the
request in writing of a majority of the Board of Directors.

              Section 6. Written notice of a special meeting stating the place,
date and hour of the meeting and the purpose or purposes for which the meeting
is called, shall be given not fewer than ten (10) nor more than sixty (60) days
before the date of the meeting, to each stockholder entitled to vote at such
meeting.

              Section 7. Business transacted at any special meeting of
stockholders shall be limited to the purposes stated in the notice.

              Section 8. The holders of fifty percent (50%) of the stock issued
and outstanding and entitled to vote thereat, present in person or represented
by proxy, shall constitute a quorum at all meetings of the stockholders for the
transaction of business except as otherwise provided by statute or by the
Certificate of Incorporation. If, however, such quorum shall not be present or
represented at any meeting of the stockholders, the stockholders entitled to
vote thereat, present in person or represented by proxy, shall have power to
adjourn the meeting from time to time, without notice other than announcement at
the meeting, until a quorum shall be present or represented. At such adjourned
meeting at which a quorum shall be present or represented any business may be
transacted which might have been transacted at the meeting as originally
notified. If the adjournment is for more than thirty days, or if after the
adjournment a new record date is fixed for the adjourned meeting, a notice of
the adjourned meeting shall be given to each stockholder of record entitled to
vote at the meeting.

              Section 9. When a quorum is present at any meeting, the vote of
the holders of a majority of the stock having voting power present in person or
represented by proxy shall decide any question brought before such meeting,
unless the question is one upon which by



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express provision of the statutes or of the Certificate of Incorporation, a
different vote is required, in which case such express provision shall govern
and control the decision of such question.

              Section 10. Unless otherwise provided in the Certificate of
Incorporation, each stockholder shall at every meeting of the stockholders be
entitled to one vote in person or by proxy for each share of the capital stock
having voting power held by such stockholder, but no proxy shall be voted on
after three years from its date, unless the proxy provides for a longer period.

              Section 11. Unless otherwise provided in the Certificate of
Incorporation, the Chairman of the Board may adjourn a meeting of stockholders
from time to time, without notice other than announcement at the meeting. No
notice of the time and place of an adjourned meeting need be given except as
required by law.

              Section 12.

              A. Annual Meetings of Stockholders

                  1. Nominations of persons for election to the Board of
Directors and the proposal of business to be considered by the stockholders may
be made at an annual meeting of stockholders only (a) pursuant to the
Corporation's notice of meeting (or any supplement thereto), (b) by or at the
direction of the Board of Directors or (c) by any stockholder of the Corporation
who was a stockholder of record at the time of giving of notice provided for in
this Section 12, who is entitled to vote at the meeting and who complies with
the notice procedures set forth in this Section 12.

                  2. For nominations or other business to be properly brought
before an annual meeting by a stockholder pursuant to clause (c) of paragraph
(a)(1) of this Section 12, the stockholder must have given timely notice thereof
in writing to the Secretary of the Corporation and such other business must
otherwise be a proper matter for stockholder action. To be timely, a
stockholder's notice shall be delivered to the Secretary at the principal
executive offices of the Corporation not later than the close of business on the
ninetieth (90th) day nor earlier than the close of business on the one hundred
twentieth (120th) day prior to the first anniversary of the date of the
preceding year's annual meeting; provided, however, that if either the date of
the annual meeting is more than thirty (30) days before or more than seventy
(70) days after such anniversary date, notice by the stockholder to be timely
must be so delivered not earlier than the close of business on the one hundred
twentieth (120th) day prior to such annual meeting and not later than the close
of business on the later of the ninetieth (90th) day prior to such annual
meeting or the close of business on the tenth (10th) day following the day on
which public announcement of the date of such meeting is first made by the
Corporation. Such stockholder's notice shall set forth (a) as to each person
whom the stockholder proposes to nominate for election or reelection as a
director, all information relating to such person that is required to be
disclosed in solicitations of proxies for election of directors, or is otherwise
required, in each case pursuant to Regulation 14A under the Securities Exchange
Act of 1934, as amended (the "Exchange Act") and Rule 14a-11 thereunder
(including such person's written consent to being named in the proxy statement
as a nominee and to serving as a director it elected); (b) as to any



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<PAGE>   4

other business that the stockholder proposes to bring before the meeting, the
text of the proposal or business (including the text of any resolutions proposed
for consideration and in the event that such business includes a proposal to
amend the By-laws of the Corporation, the language of the proposed amendment),
the reasons for conducting such business at the meeting and any material
interest in such business of such stockholder and the beneficial owner, if any,
on whose behalf the proposal is made; and (c) as to the stockholder giving the
notice and the beneficial owner, if any, on whose behalf the nomination or
proposal is made (i) the name and address of such stockholder, as they appear on
the Corporation's books, and of such beneficial owner, (ii) the class and number
of shares of capital stock of the Corporation which are owned beneficially and
of record by such stockholder and such beneficial owner, (iii) a representation
that the stockholder is a holder of record of stock of the Corporation entitled
to vote at such meeting and intends to appear in person or by proxy at the
meeting to propose such business or nomination, and (iv) a representation
whether the stockholder or the beneficial owner, if any, intends or is part of a
group which intends (a) to deliver a proxy statement and/or form of proxy to
holders of at least the percentage of the Corporation's outstanding capital
stock required to approve or adopt the proposal or elect the nominee and/or (b)
otherwise to solicit proxies from stockholders in support of such proposal or
nomination. The Corporation may require any proposed nominee to furnish such
other information as it may reasonably require to determine the eligibility of
such proposed nominee to serve as a director of the Corporation.

                  3. Notwithstanding anything in the second sentence of
paragraph (a)(2) of this Section 12 to the contrary, in the event that the
number of directors to be elected to the Board of Directors of the Corporation
is increased and there is no public announcement by the Corporation naming all
of the nominees for director or specifying the size of the increased Board of
Directors at least one hundred (100) days prior to the first anniversary of the
preceding year's annual meeting, a stockholder's notice required by this Section
12 shall also be considered timely, but only with respect to nominees for any
new positions created by such increase, if it shall be delivered to the
Secretary at the principal executive office of the Corporation not later than
the close of business on the tenth (10th) day following the day on which such
public announcement is first made by the Corporation.

              B. Special Meetings of Stockholders. Only such business shall be
conducted at a special meeting of stockholders as shall have been brought before
the meeting pursuant to the Corporation's notice of meeting. Nominations of
persons for election to the Board of Directors may be made at a special meeting
of stockholders at which directors are to be elected pursuant to the
Corporation's notice of meeting (a) by or at the direction of the Board of
Directors or (b) provided that the Board of Directors has determined that
directors shall be elected at such meeting, by any stockholder of the
Corporation who is a stockholder of record at the time notice provided for in
this Section 12 is delivered to the Secretary of the Corporation, who is
entitled to vote at the meeting and upon such election, who complies with the
notice procedures set forth in this Section 12. If the Corporation calls a
special meeting of stockholders for the purpose of electing one or more
directors to the Board of Directors, any such stockholder entitled to vote in
such election of directors may nominate a person or persons (as the case may
be), for election to such position(s) as specified in the Corporation's notice
of meeting, if the stockholder's notice required by paragraph (A)(2) of this
Section 12 shall be delivered to the Secretary at the principal executive
offices of the Corporation not earlier than the close of business on the one
hundred twentieth (120) day prior to such special meeting and not later than the
later of (x) the close of



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<PAGE>   5

business of the ninetieth (90th) day prior to such special meeting or (y) the
close of business of the tenth (10th) day following the day on which public
announcement is first made of the date of such special meeting and of the
nominees proposed by the Board of Directors to be elected at such meeting. In no
event shall the public announcement of an adjournment or postponement of a
special meeting commence a new time period (or extend any time period) for the
giving of a stockholder's notice as described above.

              C. General.

                  1. Only such persons who are nominated in accordance with the
procedures set forth in this Section 12 shall be eligible to be elected at an
annual or special meeting of stockholders of the Corporation to serve as
directors and only such business shall be conducted at a meeting of stockholders
as shall have been brought before the meeting in accordance with the procedures
set forth in this Section 12. Except as otherwise provided by law, the
Certificate of Incorporation or these By-Laws, the chairman of the meeting shall
have the power and duty (a) to determine whether a nomination or any business
proposed to be brought before the meeting was made or proposed, as the case may
be, in accordance with the procedures set forth in this Section 12 (including
whether the stockholder or beneficial owner, if any, on whose behalf the
nomination or proposal is made solicited (or is part of a group which solicited)
or did not so solicit, as the case may be, proxies in support of such
stockholder's nominee or proposal in compliance with such stockholder's
representation as required by clause (A)(2)(c)(iv) of this Section 12) and (b)
if any proposed nomination or business was not made or proposed in compliance
with this Section 12, to declare that such nomination shall be disregarded or
that such proposed business shall not be transacted.

                  2. For purposes of this Section 12, "public announcement"
shall mean disclosure in a press release reported by the Dow Jones News Service,
Associated Press or comparable national news service or in a document publicly
filed by the Corporation with the Securities and Exchange Commission pursuant to
Sections 13, 14 and 15(d) of the Exchange Act.

                  3. Notwithstanding the foregoing provisions of this Section
12, a stockholder shall also comply with all applicable requirements of the
Exchange Act and the rules and regulations thereunder with respect to the
matters set forth herein. Nothing in this Section 12 shall be deemed to affect
any rights (i) of stockholders to request inclusion of proposals in the
Corporation's proxy statement pursuant to Rule 14a-8 under the Exchange Act or
(ii) of the holders of any series of Preferred Stock to elect directors pursuant
to any applicable provisions of the Certificate of Incorporation.



                                       5
<PAGE>   6

                                   ARTICLE IV

                                    DIRECTORS


              Section 1. The number of directors which shall constitute the
whole Board shall be determined by resolution of the Board of Directors or by
the stockholders at the annual meeting of the stockholders, except as provided
in Section 2 of this Article. Directors need not be stockholders.

              Section 2. Vacancies and newly created directorships resulting
from any increase in the authorized number of directors may be filled by a
majority of the directors then in office, though less than a quorum, or by a
sole remaining director, and the directors so chosen shall hold office until the
next annual election at which such director's class is to be elected and until
their successors are duly elected and shall qualify, unless sooner displaced. If
there are no directors in office, then an election of directors may be held in
the manner provided by statute. If, at the time of filling any vacancy or any
newly created directorship, the directors then in office shall constitute less
than a majority of the whole Board (as constituted immediately prior to any such
increase), the Court of Chancery may, upon application of any stockholder or
stockholders holding at least ten percent (10%) of the total number of the
shares at the time outstanding having the right to vote for such directors,
summarily order an election to be held to fill any such vacancies or newly
created directorships, or to replace the directors chosen by the directors then
in office.

              Section 3. The business of the Corporation shall be managed by or
under the direction of its Board of Directors which may exercise all such powers
of the Corporation and do all such lawful acts and things as are not by statute
or by the Certificate of Incorporation or by these By-Laws directed or required
to be exercised or done by the stockholders.


        Meetings of the Board of Directors

              Section 4. The Board of Directors of the Corporation may hold
meetings, both regular and special, either within or without the State of
Delaware.

              Section 5. Regular meetings of the Board of Directors may be held
without notice at such time and at such place as shall from time to time be
determined by the Board. Members of the Board of Directors may participate in
regular or special meetings by means of conference telephone or similar
communications equipment by which all persons participating in the meeting can
hear each other. Such participation shall constitute presence in person.

              Section 6. Special meetings of the Board may be called by the
chairman of the board or president on two (2) days' notice to each director by
mail or forty-eight (48) hours notice to each director either personally or by
facsimile; special meetings shall be called by the president or secretary or
chairman of the board in like manner and on like notice on the written request
of two directors unless the Board consists of only one director, in which case
special



                                       6
<PAGE>   7

meetings shall be called by the chairman of the board or the president or
secretary in like manner and on like notice on the written request of the sole
director.

              Section 7. At all meetings of the Board a majority of the
directors fixed by Section 1 shall constitute a quorum for the transaction of
business and the act of a majority of the directors present at any meeting at
which there is a quorum shall be the act of the Board of Directors, except as
may be otherwise specifically provided by statute or by the Certificate of
Incorporation. If a quorum shall not be present at any meeting of the Board of
Directors, the directors present thereat may adjourn the meeting from time to
time, without notice other than announcement at the meeting, until a quorum
shall be present.

              Section 8. Unless otherwise restricted by the Certificate of
Incorporation of these By-Laws, any action required or permitted to be taken at
any meeting of the Board of Directors or of any committee thereof may be taken
without a meeting, if all members of the Board or committee, as the case may be,
consent thereto in writing, and the writing or writings are filed with the
minutes of proceedings of the Board or committee.

              Section 9. Unless otherwise restricted by the Certificate of
Incorporation or these By-Laws, members of the Board of Directors, or any
committee designated by the Board of Directors, may participate in a meeting of
the Board of Directors, or any committee, by means of conference telephone or
similar communications equipment by means of which all persons participating in
the meeting can hear each other, and such participation in a meeting shall
constitute presence in person at the meeting.


        Committees of Directors

              Section 10. The Board of Directors may, by resolution passed by a
majority of the whole Board, designate one or more committees, each committee to
consist of one or more of the directors of the Corporation. The Board may
designate one or more directors as alternate members of any committee, who may
replace any absent or disqualified member at any meeting of the committee.

              In the absence of disqualification of a member of a committee, the
member or members thereof present at any meeting and not disqualified from
voting, whether or not such member or members constitute a quorum, may
unanimously appoint another member of the Board of Directors to act at the
meeting in the place of any such absent or disqualified member.

              Any such committee, to the extent provided in the resolution of
the Board of Directors, shall have and may exercise all the powers and authority
of the Board of Directors in the management of the business and affairs of the
Corporation, and may authorize the seal of the Corporation to be affixed to all
papers which may require it; but no such committee shall have the power or
authority in reference to amending the Certificate of Incorporation, adopting an
agreement of merger or consolidation, recommending to the stockholders the sale,
lease or exchange of all or substantially all of the Corporation's property and
assets, recommending to the stockholders a dissolution of the Corporation or a
revocation of a dissolution, or amending the By-Laws of the Corporation; and,
unless the resolution or the Certificate of Incorporation



                                       7
<PAGE>   8

expressly so provide, no such committee shall have the power or authority to
declare a dividend or to authorize the issuance of stock. Such committee or
committees shall have such name or names as may be determined from time to time
by resolution adopted by the Board of Directors.

              Section 11. Each committee shall keep regular minutes of its
meetings and report the same to the Board of Directors when required.


        Compensation of Directors

              Section 12. Unless otherwise restricted by the Certificate of
Incorporation or these By-Laws, the Board of Directors shall have the authority
to fix the compensation of directors. The directors may be paid their expenses,
if any, of attendance at each meeting of the Board of Director and may be paid a
fixed sum for attendance at each meeting of the Board of Directors and a stated
salary as director. No such payment shall preclude any director from serving the
Corporation in any other capacity and receiving compensation therefor. Members
of special or standing committees may be allowed like compensation for attending
committee meetings.


        Removal of Directors

              Section 13. Any director or the entire Board of Directors may be
removed only in accordance with the provisions of the Corporation's Certificate
of Incorporation.


                                    ARTICLE V

                                     NOTICES

              Section 1. Whenever, under the provisions of the statutes or of
the Certificate of Incorporation or of these By-Laws, notice is required to be
given to any director or stockholder, it shall not be construed to mean personal
notice, but such notice may be given in writing, by mail, addressed to such
director or stockholder, at his address as it appears on the records of the
Corporation, with postage thereon prepaid, and such notice shall be deemed to be
given at the time when the same shall be deposited in the United States mail.
Notice to directors may also be given by facsimile.


              Section 2. Whenever any notice is required to be given under the
provisions of the statutes or of the Certificate of Incorporation or of these
By-Laws, a waiver thereof in writing, signed by the person or persons entitled
to said notice, whether before or after the time stated therein, shall be deemed
equivalent thereto.


                                   ARTICLE VI



                                       8
<PAGE>   9

                                    OFFICERS


              Section 1. The officers of the Corporation shall be chosen by the
Board of Directors and shall consist of a Chief Executive Officer, Chief
Financial Officer, Treasurer and a Secretary. The Board of Directors may elect
from among its members a Chairman of the Board and a Vice Chairman of the Board.
The Board of Directors may also choose one or more Vice Presidents, Assistant
Secretaries and Assistant Treasurers. Any number of offices may be held by the
same person, unless the Certificate of Incorporation or these By-Laws otherwise
provide.

              Section 2. The Board of Directors at its first meeting after each
annual meeting of stockholders shall choose a President, Chief Executive
Officer, a Treasurer, and a Secretary and may choose Vice Presidents.

              Section 3. The Board of Directors may appoint such other officers
and agents as it shall deem necessary who shall hold their offices for such
terms and shall exercise such powers and perform such duties as shall be
determined from time to time by the Board.

              Section 4. The salaries of all officers and agents of the
Corporation shall be fixed by the Board of Directors.

              Section 5. The officers of the Corporation shall hold office until
their successors are chosen and qualify. Any officer elected or appointed by the
Board of Directors may be removed at any time by the affirmative vote of a
majority of the Board of Directors. Any vacancy occurring in any office of the
Corporation shall be filled by the Board of Directors.

              The Chairman of the Board and Vice Chairman of the Board

              Section 6. The Board of Directors may appoint a Chairman of the
Board and may, but is not obligated to, designate the Chairman of the Board as
chief executive officer. If the Board of Directors appoints a Chairman of the
Board, he shall perform such duties and possess such powers as are assigned to
him by the Board of Directors. Unless otherwise provided by the Board of
Directors, the Chairman of the Board shall preside at all meetings of the
stockholders and at all meetings of the Board of Directors. If the Board of
Directors appoints a Vice Chairman of the Board, he shall, in the absence or
disability of the Chairman of the Board, perform the duties and exercise the
powers of the Chairman of the Board and shall perform such other duties and
possess such other powers as may from time to time be vested in him by the Board
of Directors.



                                       9
<PAGE>   10

              Chief Executive Officer or President

              Section 7.

              The Chief Executive Officer or President shall conduct general and
active management of the business of the Corporation and shall see that all
orders and resolutions of the Board are carried into effect, subject, however,
to the right of the directors to delegate any specific powers, except such as
may be by statute exclusively conferred on the Chief Executive Officer or
President, to any other officer or officers of the Corporation. The Chief
Executive Officer or President shall have the general power and duties of
supervision and management usually vested in the office of President of a
corporation. In the absence of the Chairman and Vice Chairman of the Board, the
Chief Executive Officer or President shall preside at all meetings of the
stockholders and the Board of Directors.

              Such individual shall execute bonds, mortgages and other contracts
requiring a seal, under the seal of the Corporation, except where required or
permitted by law to be otherwise signed and executed and except where the
signing and execution thereof shall be expressly delegated by the Board of
Directors to some other officer or agent of the Corporation.

              The Vice-Presidents

              Section 8.

              In the absence of the President or in the event of his inability
or refusal to act, the Vice President, if any, (or in the event there be more
than one Vice President, the Vice Presidents in the order designated by the
directors, or in the absence of any designation, then in the order of their
election) shall perform the duties of the President, and when so acting, shall
have all the powers of and be subject to all the restrictions upon the
President. The Vice Presidents shall perform such other duties and have such
other powers as the Board of Directors may from time to time prescribe.

              The Secretary and Assistant Secretary

              Section 9.

              The Secretary shall attend all meetings of the Board of Directors
and all meetings of the stockholders and record all the proceedings of the
meetings of the Corporation and of the Board of Directors in a book to be kept
for that purpose and shall perform like duties for the standing committees when
required. Such individual shall give, or cause to be given, notice of all
meetings of the stockholders and special meetings of the Board of Directors, and
shall perform such other duties as may be prescribed by the Board of Directors
or president, under whose supervision such individual shall be. Such individual
shall have custody of the corporate seal of the Corporation and he, or an
Assistant Secretary, shall have authority to affix the same to any instrument
requiring it and when so affixed, it may be attested by his signature or by the
signature of such assistant secretary. The Board of Directors may give general
authority to any other officer to affix the seal of the Corporation and to
attest the affixing by his signature.



                                       10
<PAGE>   11

              Section 10. The Assistant Secretary, or if there be more than one,
the Assistant Secretaries in the order determined by the Board of Directors (or
if there be no such determination, then in the order of their election) shall,
in the absence of the Secretary or in the event of his inability or refusal to
act, perform the duties and exercise the powers of the secretary and shall
perform such other duties and have such other powers as the Board of directors
may from time to time prescribe.


        The Chief Financial Officer, Treasurer and Assistant Treasurers

              Section 11. The Board of Directors shall have the authority to
appoint a Chief Financial Officer who may also be the Treasurer or a Chief
Financial Officer and a Treasurer and any Assistant Treasurers which the Board
of Directors deems necessary to the operation of the Company. The Chief
Financial Officer shall have the custody of the corporate funds and securities
and shall keep full and accurate accounts of receipts and disbursements in books
belonging to the Corporation and shall deposit all moneys and other valuable
effects in the name and to the credit of the Corporation in such depositories as
may be designated by the Board of Directors. The Treasurer, if there be one
separate from the Chief Financial Officer, shall have the duties prescribed by
the Board of Directors.

              Section 12. The Chief Financial Officer shall disburse the funds
of the Corporation as may be ordered by the Board of Directors, taking proper
vouchers for such disbursements, and shall render to the President and the Board
of Directors, at its regular meetings, or when the Board of Directors so
requires, an account of all his transactions as Chief Financial Officer and of
the financial condition of the Corporation.

              Section 13. If required by the Board of Directors, the Chief
Financial Officer or Treasurer shall give the Corporation a bond (which shall be
renewed every six years) in such sum and with such surety or sureties as shall
be satisfactory to the Board of Directors for the faithful performance of the
duties of his office and for the restoration to the Corporation, in case of his
death, resignation, retirement or removal from office, of all books, papers,
vouchers, money and other property of whatever kind in his possession or under
his control belonging to the Corporation.

              Section 14. The Assistant Treasurer, or if there shall be more
than one, the Assistant Treasurers in the order determined by the Board of
Directors (or if there be no such determination, then in the order of their
election) shall, in the absence of the Chief Financial Officer or Treasurer or
in the event of his inability or refusal to act, perform the duties and exercise
the powers of the Chief Financial Officer or Treasurer and shall perform such
other duties and have such other powers as the Board of Directors may from time
to time prescribe.



                                       11
<PAGE>   12

                                   ARTICLE VII

                              CERTIFICATE OF STOCK



              Section 1. Every holder of stock in the Corporation shall be
entitled to have a certificate, signed by, or in the name of the Corporation by,
the Chairman or Vice Chairman of the Board of Directors, or the President or a
Vice President and the Treasurer or an Assistant Treasurer, or the Secretary or
an Assistant Secretary of the Corporation, certifying the number of shares owned
by him in the Corporation.


              If the Corporation shall be authorized to issue more than one
class of stock or more than one series of any class, the powers, designations,
preferences and relative, participating, optional or other special rights of
each class of stock or series thereof and the qualification, limitations or
restrictions or such preferences and/or rights shall be set forth in full or
summarized on the face or back of the certificate which the Corporation shall
issue to represent such class or series of stock, provided that, except as
otherwise provided in Section 202 of the General Corporation Law of Delaware, in
lieu of the foregoing requirements, there may be set forth on the face or back
of the certificate which the Corporation shall issue to represent such class or
series of stock, a statement that the Corporation will furnish without charge to
each stockholder who so requests the powers, designations, preferences and
relative, participating, optional or other special rights of each class of stock
or series thereof and the qualifications, limitations or restrictions of such
preferences and/or rights.

              Section 2. Any of or all the signatures on the certificate may be
facsimile. In case any officer, transfer agent or registrar who has signed or
whose facsimile signature has been placed upon a certificate shall have ceased
to be such officer, transfer agent or registrar before such certificate is
issued, it may be issued by the Corporation with the same effect as if such
individual were such officer, transfer agent or registrar at the date of issue.


        Lost Certificates

              Section 3. The Board of Directors may direct a new certificate or
certificates to be issued in place of any certificate or certificates
theretofore issued by the Corporation alleged to have been lost, stolen or
destroyed, upon the making of an affidavit of that fact by the person claiming
the certificate of stock to be lost, stolen or destroyed. When authorizing such
issue of a new certificate or certificates, the Board of Directors may, in its
discretion and as a condition precedent to the issuance thereof, require the
owner of such lost, stolen or destroyed certificate or certificates, or his
legal representative, to advertise the same in such manner as it shall require
and/or give the Corporation a bond in such sum as it may direct as indemnity
against any claim that may be made against the Corporation with respect to the
certificate alleged to have been lost, stolen or destroyed.



                                       12
<PAGE>   13

        Transfer of Stock

              Section 4. Upon surrender to the Corporation or the transfer agent
of the Corporation of a certificate for shares duly endorsed or accompanied by
proper evidence of succession, assignation or authority to transfer, it shall be
the duty of the Corporation to issue a new certificate to the person entitled
thereto, cancel the old certificate and record the transaction upon its books.


        Fixing Record Date

              Section 5. In order that the Corporation may determine the
stockholders entitled to notice of or to vote at any meeting of stockholders or
any adjournment thereof, or to express consent to corporate action in writing
without a meeting unless expressly disallowed by the Certificate of
Incorporation, or entitled to receive payment of any dividend or other
distribution or allotment of any rights, or entitled to exercise any rights in
respect of any change, conversion or exchange of stock or for the purpose of any
other lawful action, the Board of Directors may fix, in advance, a record date,
which shall not be more than sixty (60) nor less than ten (10) days before the
date of such meeting, nor more than sixty (60) days prior to any other action. A
determination of stockholders of record entitled to notice of or to vote at a
meeting of stockholders shall apply to any adjournment of the meeting; provided,
however, that the Board of Directors may fix a new record date for the adjourned
meeting.


        Registered Stockholders

              Section 6. The Corporation shall be entitled to recognize the
exclusive right of a person registered on its books as the owner of shares to
receive dividends, and to vote as such owner, and to hold liable for calls and
assessments a person registered on its books as the owner of shares and shall
not be bound to recognize any equitable or other claim to or interest in such
share or shares on the part of any other person, whether or not it shall have
express or other notice thereof, except as otherwise provided by the laws of
Delaware.


                                  ARTICLE VIII

                               GENERAL PROVISIONS


        Dividends

              Section 1. Dividends upon the capital stock of the Corporation,
subject to the provisions of the Certificate of Incorporation, if any, may be
declared by the Board of Directors at any regular or special meeting, pursuant
to law. Dividends may be paid in cash, in property, or in shares of the capital
stock, subject to the provisions of the Certificate of Incorporation.



                                       13
<PAGE>   14

              Section 2. Before payment of any dividend, there may be set aside
out of any funds of the Corporation available for dividends such sum or sums as
the directors from time to time, in their absolute discretion, think proper as a
reserve or reserves to meet contingencies, or for equalizing dividends, or for
repairing or maintaining any property of the Corporation, or for such other
purposes as the directors shall think conducive to the interest of the
Corporation, and the directors may modify or abolish any such reserve in the
manner in which it was created.


        Checks

              Section 3. All checks or demands for money and notes of the
Corporation shall be signed by such officer or officers or such other person or
persons as the Board of Directors may from time to time designate.


        Fiscal Year

              Section 4. The fiscal year of the Corporation shall end on
December 31, unless otherwise fixed by resolution of the Board of Directors.


        Seal

              Section 5. The Board of Directors may adopt a corporate seal
having inscribed thereon the name of the Corporation, the year of its
organization and the words "Corporate Seal, Delaware." The seal may be used by
causing it or a facsimile thereof to be impressed or affixed or reproduced or
otherwise.

              Section 6. No contract or transaction between the Corporation and
one or more of the directors or officers, or between the Corporation and any
other corporation, partnership, association, or other organization in which one
or more of the directors or officers are directors or officers, or have a
financial interest, shall be void or voidable solely for this reason, or solely
because such director or officer is present at or participates in the meeting of
the Board of Directors or a committee of the Board of Directors which authorizes
the contract or transaction or solely because his, her or their votes are
counted for such purpose, if:


                  (1) The material facts as to his or her relationship or
interest and as to the contract or transaction are disclosed or are known to the
Board of Directors or the committee, and the Board or committee in good faith
authorizes the contract or transaction by the affirmative vote of a majority of
the disinterested directors, even though the disinterested directors be less
than a quorum;

                  (2) The material facts as to his or her relationship or
interest and as to the contract or transaction are disclosed or are known to the
stockholders entitled to vote thereon, and the contract or transaction is
specifically approved in good faith by vote of the stockholders; or



                                       14
<PAGE>   15

                  (3) The contract or transaction is fair as to the Corporation
as of the time it is authorized, approved or ratified, by the Board of
Directors, a committee of the Board of Directors, or the stockholders. Common or
interested directors may be counted in determining the presence of a quorum at a
meeting of the Board of Directors or of a committee which authorizes the
contract or transaction.


                                   ARTICLE IX

                                   AMENDMENTS


              These By-Laws may be repealed, altered, amended or rescinded by
the stockholders of the Corporation by vote of not less than a majority of the
outstanding shares of capital stock of the Corporation entitled to vote
generally in the election of directors (considered for this purpose as one
class) cast at a meeting of the stockholders called for that purpose (provided
that notice of such proposed repeal, alteration, amendment or rescission is
included in the notice of such meeting). In addition, in accordance with the
Corporation's Certificate of Incorporation, the Board of Directors may repeal,
alter, amend or rescind these By-Laws by vote of a majority of the Board of
Directors.


                                       15

<PAGE>   1

                            SANGAMO BIOSCIENCES, INC.

                      INCORPORATED IN THE STATE OF DELAWARE


COMMON SHARES                                                     COMMON SHARES


THIS CERTIFICATE IS TRANSFERABLE                               CUSIP 80677 10 6
IN BOSTON, MA AND NEW YORK, NY               SEE REVERSE FOR CERTAIN DEFINITIONS


This certifies that




is the recordholder of


            FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK,
                          PAR VALUE $0.01 PER SHARE of

Sangamo BioSciences, Inc. transferable on the books of the Corporation by the
holder hereof in person or by duly authorized Attorney upon surrender of this
Certificate properly endorsed. This Certificate is not valid until
countersigned and registered by the Transfer Agent and Registrar.


/s/ Shawn Johnson                                     /s/ Edward O. Lanphier
      Secretary                        President and Chief Executive Officer


Countersigned and Registered
        EQUISERVE TRUST COMPANY, N.A.

By: [illegible]
    ------------------------
    Authorized Signature

<PAGE>   2

                           SANGAMO BIOSCIENCES, INC.

     Upon request the Corporation will furnish any holder of shares of Common
Stock of the Corporation, without charge, with a full statement of the powers,
designations, preferences, and relative, participating, optional or other
special rights of any class or series of capital stock of this Corporation, and
the qualifications, limitations or restrictions of such preferences and/or
rights.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM -- as tenants in common
TEN ENT -- as tenants by the entireties
JT TEN  -- as joint tenants with right of
           survivorship and not as tenants in common

UNIF GIFT MIN ACT --                            Custodian
                     --------------------------           ----------------------
                             (cust)                              (minor)
                     under Uniform Gift to Minor
                     Act
                         -----------------------
                                (state)

   Additional abbreviations may also be used although not in the above item.

For Value received, ___________________________ hereby sell, assign and transfer
unto
PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE
______________________________________

________________________________________________________________________________
(PLEASE PRINT OR TYPEWRITE THE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE)
________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ Shares

of Common Stock represented by the within Certificate, and to hereby irrevocably
constitute and appoint
_______________________________________________________________________ Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated ____________________

In presence of

X _______________________________   X ________________________________
                                          THE SIGNATURE TO THE ASSIGMENT
                                          MUST CORRESPOND WITH THE NAME AS
                                  NOTICE: WRITTEN UPON THE FACE OF THE
                                          CERTIFICATE IN EVERY PARTICULAR,
                                          WITHOUT ALTERATION OR ENLARGEMENT OR
                                          ANY CHANGE WHATEVER.


Signature(s) Guaranteed


By ______________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE
GUARANTOR INSTITUTION (BANK, STOCKBROKER, SAVINGS
AND LOAN ASSOCIATION AND CREDIT UNION WITH MEMBERSHIP
IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO SEC RULE 17 AND 18.

<PAGE>   1

                                                                    EXHIBIT 4.2

                            SANGAMO BIOSCIENCES, INC.

                AMENDED AND RESTATED INVESTORS' RIGHTS AGREEMENT

                                 MARCH ___, 2000



<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                          <C>
1.  Definitions.........................................................................       1


2.  Registration Rights.................................................................       2

    2.1.   Request for Registration.....................................................       3
    2.2.   Company Registration.........................................................       4
    2.3.   Obligations of the Company...................................................       5
    2.4.   Furnish Information..........................................................       6
    2.5.   Expenses of Demand Registration..............................................       7
    2.6.   Expenses of Company Registration.............................................       7
    2.7.   Underwriting Requirements....................................................       7
    2.8.   Delay of Registration........................................................       8
    2.9.   Indemnification..............................................................       8
    2.10.  Reports Under Securities Exchange Act of 1934................................      10
    2.11.  Form S-3 Registration........................................................      10
    2.12.  Assignment of Registration Rights............................................      11
    2.13.  Limitations on Subsequent Registration Rights................................      12
    2.14.  "Market Stand-Off" Agreement.................................................      12
    2.15.  Termination of Registration Rights...........................................      13

3.  Covenants of the Company............................................................      13

    3.1.   Delivery of Financial Statements.............................................      13
    3.2.   Termination of Information Covenant..........................................      13
    3.3.   Right of First Offer.........................................................      13
    3.4.   Board Representation and Observer Rights.....................................      15
    3.5.   Termination of Covenants.....................................................      15

4.  Miscellaneous.......................................................................      16

    4.1.   Successors and Assigns.......................................................      16
    4.2.   Governing Law................................................................      16
    4.3.   Counterparts.................................................................      16
    4.4.   Titles and Subtitles.........................................................      16
    4.5.   Notices......................................................................      16
    4.6.   Expenses.....................................................................      16
    4.7.   Amendments and Waivers.......................................................      16
    4.8.   Severability.................................................................      16
    4.9.   Aggregation of Stock.........................................................      17
    4.10.  Entire Agreement; Amendment; Waiver..........................................      17
Schedule A
Schedule B
</TABLE>


                                       i
<PAGE>   3

                           INVESTORS' RIGHTS AGREEMENT

        THIS AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT is made as of March
___, 2000, by and between Sangamo BioSciences, Inc., a Delaware corporation (the
"Company"), and the investors listed on Schedule A hereto and the Stockholders
listed on Schedule B hereto, each of which is herein referred to as an
"Investor."


                                    RECITALS

        WHEREAS, the Company and certain Investors (the "Series A Investors")
are parties to that certain Series A Preferred Stock Purchase Agreement dated
June 28, 1996 (the "Series A Agreement");

        WHEREAS, the Company and certain other Investors (the "Series B
Investors") are parties to that certain Series B Preferred Stock Purchase
Agreement dated November 6, 1997 (the "Series B Agreement");

        WHEREAS, the Company and certain Investors (the "Series C Investors")
are parties to that certain Series C Preferred Stock Purchase Agreement dated as
of August 24, 1999;

        WHEREAS, the Company and an Investor (the "Additional Series C
Investor") are parties to that certain Series C Preferred Stock Purchase
Agreement dated as of November 5, 1999;

        WHEREAS, the Company and an Investor (the "Final Series C Investor") are
parties to that certain Series C Preferred Stock Purchase Agreement dated as of
January 20, 2000;

        WHEREAS, the Company has granted the Series A, Series B and Series C
Investors and the Stockholders registration rights, information rights, rights
of first offer and other rights (collectively, the "Prior Rights") pursuant to
that certain Investor Rights Agreement dated November 5, 1999 (the "Prior Rights
Agreement");

        WHEREAS, in order to update certain information in Section 3.3(d), the
Company, the Series A Investors, the Series B Investors, the Series C Investors
and the Stockholders hereby agree to terminate the Prior Rights Agreement in its
entirety and to accept in lieu of the Prior Rights Agreement, the registration
rights, information rights, rights of first offer and other rights and
obligations provided for herein.

        NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

        1. Definitions. For purposes of this Investor Rights Agreement:

              (a) The term "Act" means the Securities Act of 1933, as amended.

              (b) The term "Form S-3" means such form under the Act as in effect
on the date hereof or any registration form under the Act subsequently adopted
by the SEC which


<PAGE>   4

permits inclusion or incorporation of substantial information by reference to
other documents filed by the Company with the SEC.

              (c) The term "Holder" means any person owning or having the right
to acquire Registrable Securities or any assignee thereof in accordance with
Section 2.12 hereof.

              (d) The term "Major Holder" means any person owning of having the
right to acquire at least, (i) in the case of a holder of Series A Preferred
Shares, twenty-five thousand (25,000) shares (as adjusted for any stock
dividends, combinations or splits), or, (ii) in the case of a holder of Series B
Preferred Shares, one hundred thousand (100,000) shares (as adjusted for any
stock dividends, combinations or splits), or (iii) in the case of a holder of
Series C Preferred Shares, fifty thousand (50,000) shares (as adjusted for any
stock dividends, combinations or splits), of Registrable Securities or any
assignee thereof in accordance with Section 2.12 hereof.

              (e) The term "1934 Act" shall mean the Securities Exchange Act of
1934, as amended.

              (f) The term "Preferred Stock" shall mean collectively the
Company's Series A Preferred Stock, par value $0.01 per share, and the Company's
Series B Preferred Stock, par value $0.01 per share.

              (g) The term "register", "registered" and "registration" refer to
a registration effected by preparing and filing a registration statement or
similar document in compliance with the Act, and the declaration or ordering of
effectiveness of such registration statement or document.

              (h) The term "Registrable Securities" means (i) the Common Stock
issued and outstanding as of this date (as identified on Schedule B hereto),
(ii) the Common Stock issuable or issued upon conversion of the Preferred Stock,
and (iii) any Common Stock of the Company issued as (or issuable upon the
conversion or exercise of any warrant, right or other security which is issued
as) a dividend or other distribution with respect to, or in exchange for or in
replacement of the shares referenced in (i) and (ii) above, excluding in all
cases, however, any Registrable Securities sold by a person in a transaction in
which his rights under Section 2 are not assigned.

              (i) The number of shares of "Registrable Securities then
outstanding" shall be determined by the number of shares of Common Stock
outstanding which are, and the number of shares of Common Stock issuable
pursuant to then exercisable or convertible securities which are, Registrable
Securities.

              (j) The term "SEC" shall mean the Securities and Exchange
Commission.

        2. Registration Rights. The Company covenants and agrees as follows:

              2.1. Request for Registration.

                  (a) If the Company shall receive at any time six (6) months
after the effective date of the first registration statement for a public
offering of securities of the Company



                                       2
<PAGE>   5

(other than a registration statement relating either to the sale of securities
to employees of the Company pursuant to a stock option, stock purchase or
similar plan or a SEC Rule 145 transaction), a written request from the Holders
of at least 40% of the outstanding Series A Preferred Stock and Series B
Preferred Stock and Series C Preferred Stock (collectively, the "Preferred
Stock"), or the Common Stock into which such Preferred Stock is convertible,
that the Company file a registration statement under the Act covering the
registration of all or a part of the Registrable Securities having a reasonably
anticipated aggregate offering price, net of underwriting discounts and
commissions that exceeds $7,500,000, then the Company shall:

                       (i) within ten (10) days of the receipt thereof, give
written notice of such request to all Holders; and

                       (ii) effect, as soon as practicable, the registration
under the Act of all Registrable Securities which the Holders request to be
registered, subject to the limitations of subsection 2.1(b), within twenty (20)
days of the mailing of such notice by the Company in accordance with Section
4.5.

                  (b) If the Holders initiating the registration request
hereunder ("Initiating Holders") intend to distribute the Registrable Securities
covered by their request by means of an underwriting, they shall so advise the
Company as a part of their request made pursuant to subsection 2.1(a) and the
Company shall include such information in the written notice referred to in
subsection 2.1(a). The underwriter will be selected by the Company and shall be
reasonably acceptable to a majority in interest of the Initiating Holders. In
such event, the right of any Holder to include his Registrable Securities in
such registration shall be conditioned upon such Holder's participation in such
underwriting and the inclusion of such Holder's Registrable Securities in the
underwriting (unless otherwise mutually agreed by a majority in interest of the
Initiating Holders and such Holder) to the extent provided herein. All Holders
proposing to distribute their securities through such underwriting shall
(together with the Company as provided in subsection 2.3(e)) enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for such underwriting. Notwithstanding any other provision of this
Section 2.1, if either the underwriter or the Company advises the Initiating
Holders in writing that marketing factors require a limitation of the number of
shares to be underwritten, then the Initiating Holders shall so advise all
Holders of Registrable Securities which would otherwise be underwritten pursuant
hereto, and the number of shares of Registrable Securities that may be included
in the underwriting shall be allocated among all Holders thereof, including the
Initiating Holders, in proportion (as nearly as practicable) to the amount of
Registrable Securities of the Company owned by each Holder.

                  (c) Notwithstanding the foregoing, if the Company shall
furnish to Holders requesting a registration statement pursuant to this Section
2.1, a certificate signed by the Chief Executive Officer of the Company stating
that in the good faith judgment of the Board of Directors of the Company, it
would be seriously detrimental to the Company and its stockholders for such
registration statement to be filed and it is therefore essential to defer the
filing of such registration statement, the Company shall have the right to defer
taking action with respect to such filing for a period of not more than 120 days
after receipt of the request of the Initiating Holders; provided, however, that
the Company may not utilize this right more than once in any twelve-month
period.



                                       3
<PAGE>   6

                  (d) In addition, the Company shall not be obligated to effect,
or to take any action to effect, any registration pursuant to this Section 2.1:

                       (i) After the Company has effected one registration
pursuant to this Section 2.1 and such registration has been declared or ordered
effective;

                       (ii) During the period starting with the date sixty (60)
days prior to the Company's good faith estimate of the date of filing of, and
ending on a date one hundred eighty (180) days after the effective date of, a
registration subject to Section 2.2 hereof; provided that the Company is
actively employing in good faith all reasonable efforts to cause such
registration statement to become effective; or

                       (iii) If the Initiating Holders propose to dispose of
shares of Registrable Securities that may be immediately registered on Form S-3
pursuant to a request made pursuant to Section 2.11 below.

              2.2. Company Registration.

                  (a) If (but without any obligation to do so) the Company
proposes to register (including for this purpose a registration effected by the
Company for stockholders other than the Holders) any of its stock or other
securities under the Act in connection with the public offering of such
securities solely for cash (other than a registration relating solely to the
sale of securities to participants in a Company stock plan, a registration on
any form which does not include substantially the same information as would be
required to be included in a registration statement covering the sale of the
Registrable Securities or a registration in which the only Common Stock being
registered is Common Stock issuable upon conversion of debt securities which are
also being registered), the Company shall, at such time, promptly give each
Major Holder written notice of such registration. Upon the written request of
each Major Holder given within twenty (20) days after mailing of such notice by
the Company in accordance with Section 4.5, the Company shall, subject to the
provisions of Section 2.7, cause to be registered under the Act all of the
Registrable Securities that each such Major Holder has requested to be
registered.

                  (b) If the Company intends to distribute the Registrable
Securities by means of an underwriting, it shall so advise the Major Holders in
the written notice referred to in subsection 2.2(a). The underwriter will be
selected by the Company and shall be reasonably acceptable to a majority in
interest of the Major Holders. In such event, the right of any Major Holder to
include his Registrable Securities in such registration shall be conditioned
upon such Holder's participation in such underwriting and the inclusion of such
Holder's Registrable Securities in the underwriting (unless otherwise mutually
agreed by a majority in interest of the Major Holders and such Holder) to the
extent provided herein. All Major Holders proposing to distribute their
securities through such underwriting shall (together with the Company as
provided in subsection 2.3(e)) enter into an underwriting agreement in customary
form with the underwriter or underwriters selected for such underwriting.
Notwithstanding any other provision of this Section 2.2, if either the
underwriter or the Company advises the Major Holders in writing that, in the
good faith determination of the underwriter, marketing factors require a
limitation of the number of shares to be underwritten, then the number of shares
of Registrable Securities that may be included in the underwriting shall be
allocated among all Major Holders thereof, in



                                       4
<PAGE>   7

proportion (as nearly as practicable) to the amount of Registrable Securities of
the Company owned by each Major Holder; provided, however, that the number of
shares of Registrable Securities held by the Company to be included in such
underwriting shall not be reduced unless all other securities are first entirely
excluded from the underwriting. In the event that the underwriting set forth in
this Section 2.2(b) is the initial public offering of the Company's securities,
the Major Holders may be excluded entirely if either the underwriters or the
Company make the determination set forth above.

              2.3. Obligations of the Company. Whenever required under this
Section 2 to effect the registration of any Registrable Securities, the Company
shall, as expeditiously as reasonably possible:

                  (a) Prepare and file with the SEC a registration statement
with respect to such Registrable Securities and use its best efforts to cause
such registration statement to become effective, and, upon the request of the
Holders of a majority of the Registrable Securities registered thereunder, keep
such registration statement effective for a period of up to one hundred twenty
(120) days or until the distribution contemplated in the Registration Statement
has been completed; provided, however, that (i) such 120-day period shall be
extended for a period of time equal to the period the Holder refrains from
selling any securities included in such registration at the request of an
underwriter of Common Stock (or other securities) of the Company; and (ii) in
the case of any registration of Registrable Securities on Form S-3 which are
intended to be offered on a continuous or delayed basis, such 120-day period
shall be extended, if necessary, to keep the registration statement effective
until all such Registrable Securities are sold, provided that Rule 415, or any
successor rule under the Act, permits an offering on a continuous or delayed
basis, and provided further that applicable rules under the Act governing the
obligation to file a post-effective amendment permit, in lieu of filing a
post-effective amendment which (I) includes any prospectus required by Section
10(a)(3) of the Act or (II) reflects facts or events representing a material or
fundamental change in the information set forth in the registration statement,
the incorporation by reference of information required to be included in (I) and
(II) above to be contained in periodic reports filed pursuant to Section 13 or
15(d) of the 1934 Act in the registration statement.

                  (b) Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Act with respect to the disposition of all securities covered
by such registration statement.

                  (c) Furnish to the Holders such numbers of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Act, and such other documents as they may reasonably request
in order to facilitate the disposition of Registrable Securities owned by them.

                  (d) Use its best efforts to register and qualify the
securities covered by such registration statement under such other securities or
Blue Sky laws of such jurisdictions as shall be reasonably requested by the
Holders; provided that the Company shall not be required in connection therewith
or as a condition thereto to qualify to do business or to file a general



                                       5
<PAGE>   8

consent to service of process in any such states or jurisdictions, unless the
Company is already subject to service in such jurisdiction and except as may be
required by the Act.

                  (e) In the event of any underwritten public offering, enter
into and perform its obligations under an underwriting agreement, in usual and
customary form, with the managing underwriter of such offering. Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

                  (f) Notify each Holder of Registrable Securities covered by
such registration statement at any time when a prospectus relating thereto is
required to be delivered under the Act of the happening of any event as a result
of which the prospectus included in such registration statement, as then in
effect, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing.

                  (g) Cause all such Registrable Securities registered pursuant
hereunder to be listed on each securities exchange on which similar securities
issued by the Company are then listed.

                  (h) Provide a transfer agent and registrar for all Registrable
Securities registered pursuant hereunder and a CUSIP number for all such
Registrable Securities, in each case not later than the effective date of such
registration.

                  (i) Use its best efforts to furnish, at the request of any
Holder requesting registration of Registrable Securities pursuant to this
Section 2, on the date that such Registrable Securities are delivered to the
underwriters for sale in connection with a registration pursuant to this Section
2, if such securities are being sold through underwriters, or, if such
securities are not being sold through underwriters, on the date that the
registration statement with respect to such securities becomes effective, (i) an
opinion, dated such date, of the counsel representing the Company for the
purposes of such registration, in form and substance as is customarily given to
underwriters in an underwritten public offering, addressed to the underwriters,
if any, and to the Holders requesting registration of Registrable Securities and
(ii) a letter dated such date, from the independent certified public accountants
of the Company, in form and substance as is customarily given by independent
certified public accountants to underwriters in an underwritten public offering,
addressed to the underwriters, if any, and to the Holders requesting
registration of Registrable Securities.

              2.4. Furnish Information.

                  (a) It shall be a condition precedent to the obligations of
the Company to take any action pursuant to this Section 2 with respect to the
Registrable Securities of any selling Holder that such Holder shall furnish to
the Company such information regarding itself, the Registrable Securities held
by it, and the intended method of disposition of such securities as shall be
required to effect the registration of such Holder's Registrable Securities.

                  (b) The Company shall have no obligation with respect to any
registration requested pursuant to Section 2.1 or Section 2.11 if, due to the
operation of subsection 2.4(a), the number of shares or the anticipated
aggregate offering price of the



                                       6
<PAGE>   9

Registrable Securities to be included in the registration does not equal or
exceed the number of shares or the anticipated aggregate offering price required
to originally trigger the Company's obligation to initiate such registration as
specified in subsection 2.1(a) or subsection 2.11(b)(2), whichever is
applicable.

              2.5. Expenses of Demand Registration. All expenses other than
underwriting discounts and commissions incurred in connection with
registrations, filings or qualifications pursuant to Section 2.1, including
(without limitation) all registration, filing and qualification fees, printers'
and accounting fees, fees and disbursements of counsel for the Company
(including fees and disbursements of counsel for the Company in its capacity as
counsel to the selling Holders hereunder; if Company counsel does not make
itself available for this purpose, the Company will pay the reasonable fees and
disbursements of one counsel for the selling Holders) shall be borne by the
Company; provided, however, that the Company shall not be required to pay for
any expenses of any registration proceeding begun pursuant to Section 2.1 if the
registration request is subsequently withdrawn at the request of the Holders of
a majority of the Registrable Securities to be registered (in which case all
participating holders shall bear such expenses), unless the Holders of a
majority of the Registrable Securities agree to forfeit their right to one
demand registration pursuant to Section 2.1; provided further, however, that if
at the time of such withdrawal, the Holders have learned of a material adverse
change in the condition, business, or prospects of the Company from that known
to the Holders at the time of their request and have withdrawn the request with
reasonable promptness following disclosure by the Company of such material
adverse change, then the Holders shall not be required to pay any of such
expenses and shall retain their rights pursuant to Section 2.1.

              2.6. Expenses of Company Registration. The Company shall bear and
pay all expenses incurred in connection with any registration, filing or
qualification of Registrable Securities with respect to the registrations
pursuant to Section 2.2 for each Holder (which right may be assigned as provided
in Section 2.12), including (without limitation) all registration, filing, and
qualification fees, printers and accounting fees relating or apportionable
thereto and the fees and disbursements of counsel for the Company in its
capacity as counsel to the selling Holders hereunder; if Company counsel does
not make itself available for this purpose, the Company will pay the reasonable
fees and disbursements of one counsel for the selling Holders selected by them,
but excluding underwriting discounts and commissions relating to Registrable
Securities.

              2.7. Underwriting Requirements. In connection with any offering
involving an underwriting of shares of the Company's capital stock, the Company
shall not be required under Section 2.2 to include any of the Holders'
securities in such underwriting unless they accept the terms of the underwriting
as agreed upon between the Company and the underwriters selected by it (or by
other persons entitled to select the underwriters), and then only in such
quantity as the underwriters and Company determine in their sole discretion will
not, jeopardize the success of the offering by the Company. If the total amount
of securities, including Registrable Securities, requested by stockholders to be
included in such offering exceeds the amount of securities sold other than by
the Company that the underwriters and Company determine in their sole discretion
is compatible with the success of the offering, then the Company shall be
required to include in the offering only that number of such securities,
including Registrable Securities, which the underwriters and Company determine
in their sole discretion will not jeopardize the success of



                                       7
<PAGE>   10

the offering (the securities so included to be apportioned pro rata among the
selling stockholders according to the total amount of securities entitled to be
included therein owned by each selling Stockholder. For purposes of the
preceding parenthetical concerning apportionment, for any selling stockholder
which is a holder of Registrable Securities and which is a partnership or
corporation, the partners, retired partners and stockholders of such holder, or
the estates and family members of any such partners and retired partners and any
trusts for the benefit of any of the foregoing persons shall be deemed to be a
single "selling stockholder," and any pro-rata reduction with respect to such
"selling stockholder" shall be based upon the aggregate amount of shares
carrying registration rights owned by all entities and individuals included in
such "selling stockholder," as defined in this sentence.

              2.8. Delay of Registration. No Holder shall have any right to
obtain or seek an injunction restraining or otherwise delaying any such
registration as the result of any controversy that might arise with respect to
the interpretation or implementation of this Section 2.

              2.9. Indemnification. In the event any Registrable Securities are
included in a registration statement under this Section 2:

                  (a) To the extent permitted by law, the Company will indemnify
and hold harmless each Holder, any underwriter (as defined in the Act) for such
Holder and each person, if any, who controls such Holder or underwriter within
the meaning of the Act or the 1934 Act, against any losses, claims, damages, or
liabilities (joint or several) to which they may become subject under the Act,
the 1934 Act or other federal or state law, insofar as such losses, claims,
damages, or liabilities (or actions in respect thereof) arise out of or are
based upon any of the following statements, omissions or violations
(collectively a "Violation"): (i) any untrue statement or alleged untrue
statement of a material fact contained in such registration statement, including
any preliminary prospectus or final prospectus contained therein or any
amendments or supplements thereto, (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein not misleading, or (iii) any violation or alleged
violation by the Company of the Act, the 1934 Act, any state securities law or
any rule or regulation promulgated under the Act, the 1934 Act or any state
securities law; and the Company will pay to each such Holder, underwriter or
controlling person, as incurred, any legal or other expenses reasonably incurred
by them in connection with investigating or defending any such loss, claim,
damage, liability, or action; provided, however, that the indemnity agreement
contained in this subsection 2.9(a) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability, or action if such
settlement is effected without the consent of the Company (which consent shall
not be unreasonably withheld), nor shall the Company be liable in any such case
for any such loss, claim, damage, liability, or action to the extent that it
arises out of or is based upon a Violation which occurs in reliance upon and in
conformity with written information furnished expressly for use in connection
with such registration by any such Holder, underwriter or controlling person.

                  (b) To the extent permitted by law, each selling Holder will
indemnify and hold harmless the Company, each of its directors, each of its
officers who has signed the registration statement, each person, if any, who
controls the Company within the meaning of the Act, any underwriter, any other
Holder selling securities in such registration statement and any controlling
person of any such underwriter or other Holder, against any losses, claims,
damages,



                                       8
<PAGE>   11

or liabilities (joint or several) to which any of the foregoing persons may
become subject, under the Act, the 1934 Act or other federal or state law,
insofar as such losses, claims, damages, or liabilities (or actions in respect
thereto) arise out of or are based upon any Violation, in each case to the
extent (and only to the extent) that such Violation occurs in reliance upon and
in conformity with written information furnished by such Holder expressly for
use in connection with such registration; and each such Holder will pay, as
incurred, any legal or other expenses reasonably incurred by any person intended
to be indemnified pursuant to this subsection 2.9(b), in connection with
investigating or defending any such loss, claim, damage, liability, or action;
provided, however, that the indemnity agreement contained in this subsection
2.9(b) shall not apply to amounts paid in settlement of any such loss, claim,
damage, liability or action if such settlement is effected without the consent
of the Holder, which consent shall not be unreasonably withheld; provided, that,
in no event shall any indemnity under this subsection 2.9(b) exceed the gross
proceeds from the offering received by such Holder.

              (c) Promptly after receipt by an indemnified party under this
Section 1.10 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 2.9, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party
(together with all other indemnified parties which may be represented without
conflict by one counsel) shall have the right to retain one separate counsel,
with the fees and expenses to be paid by the indemnifying party, if
representation of such indemnified party by the counsel retained by the
indemnifying party would be inappropriate due to actual or potential differing
interests between such indemnified party and any other party represented by such
counsel in such proceeding. The failure to deliver written notice to the
indemnifying party within a reasonable time of the commencement of any such
action, if prejudicial to its ability to defend such action, shall relieve such
indemnifying party of any liability to the indemnified party under this Section
2.9, but the omission so to deliver written notice to the indemnifying party
will not relieve it of any liability that it may have to any indemnified party
otherwise than under this Section 2.9.

              (d) If the indemnification provided for in this Section 2.9 is
held by a court of competent jurisdiction to be unavailable to an indemnified
party with respect to any loss, liability, claim, damage, or expense referred to
therein, then the indemnifying party, in lieu of indemnifying such indemnified
party hereunder, shall contribute to the amount paid or payable by such
indemnified party as a result of such loss, liability, claim, damage, or expense
in such proportion as is appropriate to reflect the relative fault of the
indemnifying party on the one hand and of the indemnified party on the other in
connection with the statements or omissions that resulted in such loss,
liability, claim, damage, or expense as well as any other relevant equitable
considerations. The relative fault of the indemnifying party and of the
indemnified party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission to state a material fact relates to information supplied by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge, access to information, and opportunity to correct or prevent such
statement or omission.



                                       9
<PAGE>   12

                  (e) Notwithstanding the foregoing, to the extent that the
provisions on indemnification and contribution contained in the underwriting
agreement entered into in connection with the underwritten public offering are
in conflict with the foregoing provisions, the provisions in the underwriting
agreement shall control.

                  (f) The obligations of the Company and Holders under this
Section 2.9 shall survive the completion of any offering of Registrable
Securities in a registration statement, whether or not the registration was
pursuant to this Section 2.

              2.10. Reports Under Securities Exchange Act of 1934. With a view
to making available to the Holders the benefits of Rule 144 promulgated under
the Act and any other rule or regulation of the SEC that may at any time permit
a Holder to sell securities of the Company to the public without registration or
pursuant to a registration on Form S-3, the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in SEC Rule 144, at all times after ninety (90) days
after the effective date of the first registration statement filed by the
Company for the offering of its securities to the general public;

                  (b) take such action, including the voluntary registration of
its Common Stock under Section 12 of the 1934 Act, as is necessary to enable the
Holders to utilize Form S-3 for the sale of their Registrable Securities, such
action to be taken as soon as practicable after the end of the fiscal year in
which the first registration statement filed by the Company for the offering of
its securities to the general public is declared effective;

                  (c) file with the SEC in a timely manner all reports and other
documents required of the Company under the Act and the 1934 Act; and

                  (d) furnish to any Holder, so long as the Holder owns any
Registrable Securities, forthwith upon request (i) a written statement by the
Company that it has complied with the reporting requirements of SEC Rule 144 (at
any time after ninety (90) days after the effective date of the first
registration statement filed by the Company), the Act and the 1934 Act (at any
time after it has become subject to such reporting requirements), or that it
qualifies as a registrant whose securities may be resold pursuant to Form S-3
(at any time after it so qualifies), (ii) a copy of the most recent annual or
quarterly report of the Company and such other reports and documents so filed by
the Company, and (iii) such other information as may be reasonably requested in
availing any Holder of any rule or regulation of the SEC which permits the
selling of any such securities without registration or pursuant to such form.

              2.11. Form S-3 Registration. In case the Company shall receive
from a Major Holder or Major Holders of the Registrable Securities a written
request or requests that the Company effect a registration on Form S-3 and any
related qualification or compliance with respect to all or a part of the
Registrable Securities owned by such Major Holder or Major Holders, the Company
will:

                  (a) promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other Major Holders; and



                                       10
<PAGE>   13

                  (b) as soon as practicable, effect such registration and all
such qualifications and compliances as may be so requested and as would permit
or facilitate the sale and distribution of all or such portion of such Major
Holder's or Major Holders' Registrable Securities as are specified in such
request, together with all or such portion of the Registrable Securities of any
other Major Holder or Major Holders joining in such request as are specified in
a written request given within fifteen (15) days after receipt of such written
notice from the Company; provided, however, that the Company shall not be
obligated to effect any such registration, qualification or compliance, pursuant
to this Section 2.11: (1) if Form S-3 is not available for such offering by the
Major Holders; (2) if the Major Holders, together with the holders of any other
securities of the Company entitled to inclusion in such registration, propose to
sell Registrable Securities and such other securities (if any) at an aggregate
price to the public (net of any underwriters' discounts or commissions) of less
than $1,000,000; (3) if the Company shall furnish to the Major Holders a
certificate signed by the President of the Company stating that in the good
faith judgment of the Board of Directors of the Company, it would be seriously
detrimental to the Company and its stockholders for such Form S-3 Registration
to be effected at such time, in which event the Company shall have the right to
defer the filing of the Form S-3 registration statement for a period of not more
than one hundred fifty (150) days after receipt of the request of the Major
Holder or Major Holders under this Section 2.11; provided, however, that the
Company shall not utilize this right more than once in any twelve month period;
(4) if the Company has, within the twelve (12) month period preceding the date
of such request, already effected one registration on Form S-3 for the Major
Holders pursuant to this Section 2.11; or (5) in any particular jurisdiction in
which the Company would be required to qualify to do business or to execute a
general consent to service of process in effecting such registration,
qualification or compliance.

                  (c) Subject to the foregoing, the Company shall file a
registration statement covering the Registrable Securities and other securities
so requested to be registered as soon as practicable after receipt of the
request or requests of the Major Holders. All expenses incurred in connection
with two (2) registrations requested pursuant to Section 2.11, including
(without limitation) all registration, filing, qualification, printer's and
accounting fees and the reasonable fees and disbursements of counsel for the
selling Major Holder or Major Holders and counsel for the Company, but excluding
any underwriters' discounts or commissions associated with Registrable
Securities, shall be borne by the Company. Thereafter, all expenses incurred in
connection with a registration requested pursuant to Section 2.11, including
(without limitation) all registration, filing, qualification, printer's and
accounting fees and the reasonable fees and disbursements of counsel for the
selling Major Holder or Major Holders and counsel for the Company, but excluding
any underwriters' discounts or commissions associated with Registrable
Securities, shall be borne pro rata by the Major Holder or Major Holders
participating in the Form S-3 Registration. Registrations effected pursuant to
this Section 2.11 shall not be counted as demands for registration or
registrations effected pursuant to Sections 2.1 or 2.2, respectively.

              2.12. Assignment of Registration Rights. The rights to cause the
Company to register Registrable Securities pursuant to this Section 2 may be
assigned (but only with all related obligations) by a Holder to a transferee or
assignee of such securities who, after such assignment or transfer, holds at
least (i) in the case of Series A Preferred Shares, twenty-five thousand
(25,000) shares, (ii) in the case of Series B Preferred Shares, one hundred
thousand (100,000) shares, or (iii) in the case of Series C Preferred Shares,
fifty thousand (50,000) shares,



                                       11
<PAGE>   14

of Registrable Securities (subject to appropriate adjustment for stock splits,
stock dividends, combinations and other recapitalizations), provided: (a) the
Company is, within a reasonable time after such transfer, furnished with written
notice of the name and address of such transferee or assignee and the securities
with respect to which such registration rights are being assigned; (b) such
transferee or assignee agrees in writing to be bound by and subject to the terms
and conditions of this Agreement, including without limitation the provisions of
Section 2.14 below; and (c) such assignment shall be effective only if
immediately following such transfer the further disposition of such securities
by the transferee or assignee is restricted under the Act. For the purposes of
determining the number of shares of Registrable Securities held by a transferee
or assignee, the holdings of transferees and assignees of a partnership who are
partners or retired partners of such partnership (including spouses and
ancestors, lineal descendants and siblings of such partners or spouses who
acquire Registrable Securities by gift, will or intestate succession) shall be
aggregated together and with the partnership; provided that all assignees and
transferees who would not qualify individually for assignment of registration
rights shall have a single attorney-in-fact for the purpose of exercising any
rights, receiving notices or taking any action under this Section 2.

              2.13. Limitations on Subsequent Registration Rights. From and
after the date of this Agreement, the Company shall not, without the prior
written consent of the Holders of a majority of the outstanding Registrable
Securities, enter into any agreement with any holder or prospective holder of
any securities of the Company which would allow such holder or prospective
holder (a) to include such securities in any registration filed under Section
2.1 hereof, unless under the terms of such agreement, such holder or prospective
holder may include such securities in any such registration only to the extent
that the inclusion of his securities will not reduce the amount of the
Registrable Securities of the Holders which is included or (b) to make a demand
registration which could result in such registration statement being declared
effective prior to the earlier of either of the dates set forth in subsection
2.1(a) or within one hundred twenty (120) days of the effective date of any
registration effected pursuant to Section 2.1.

              2.14. "Market Stand-Off" Agreement. Each Holder hereby agrees
that, during the period of duration specified by the Company and an underwriter
of common stock or other securities of the Company, following the effective date
of a registration statement of the Company filed under the Act, it shall not, to
the extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including, without limitation, any short
sale), grant any option to purchase or otherwise transfer or dispose of (other
than to donees who agree to be similarly bound) any securities of the Company
held by it at any time during such period except common stock included in such
registration; provided, however, that such market stand-off time period shall
not exceed one hundred eighty (180) days.

              In order to enforce the foregoing covenant, the Company may impose
stop-transfer instructions with respect to the Registrable Securities of each
Holder (and the shares or securities of every other person subject to the
foregoing restriction) until the end of such period.

              Notwithstanding the foregoing, the obligations described in this
Section 1.15 shall not apply to a registration solely to employee benefit plans
on Form S-1 or Form S-8 or similar forms which may be promulgated in the future,
or a registration relating solely to a Commission



                                       12
<PAGE>   15

Rule 145 transaction on Form S-14 or Form S-15 or similar forms which may be
promulgated in the future.

              2.15. Termination of Registration Rights.

                  (a) The right of any Holder to request registration or
inclusion in registration pursuant to this Section 1 shall terminate on the
earlier of (i) two years after the closing of an initial public offering of
Common Stock of the Company; or (ii) such date as all shares of Registrable
Securities held or entitled to be held upon conversion by such Holder may
immediately be sold under Rule 144 during any ninety (90) day period.

                  (b) No Holder shall be entitled to exercise any right provided
for in this Section 2 while such Holder owns less than one percent (1%) of the
Company's Common Stock and would continue to hold less than one percent (1%) of
the Company's Common Stock following conversion of all of such Holder's
Preferred Stock to Common Stock.

        3. Covenants of the Company.

              3.1. Delivery of Financial Statements. The Company shall
automatically deliver to each Major Holder copies of its quarterly and annual
unaudited or audited, as the case may be, financial statements, prepared in
accordance with generally accepted accounting principles ("GAAP").

              3.2. Termination of Information Covenant. The covenant set forth
in Section 3.1 shall terminate and shall be of no further force or effect when
the sale of securities pursuant to a registration statement filed by the Company
under the Act in connection with the firm commitment underwritten offering of
its securities to the general public is consummated or when the Company first
becomes subject to the periodic requirements of Sections 12(g) or 15(d) of the
1934 Act, whichever event shall first occur.

              3.3. Right of First Offer. Subject to the terms and conditions
specified in this paragraph 3.3, the Company hereby grants to each Major
Investor a right of first offer with respect to future sales by the Company of
its Shares (as hereinafter defined). For purposes of this Section 3.3 a "Major
Investor" shall mean any person who holds at least, (i) in the case of Series A
Preferred Stock, twenty-five thousand (25,000) shares (as adjusted for any stock
dividends, combinations or splits) of Series A Preferred Stock (or the Common
Stock issued upon the conversion thereof) or, (ii) in the case of Series B and
Series C Preferred Stock, sixteen thousand (16,000) shares (as adjusted for any
stock dividends, combinations or splits) of Series B and Series C Preferred
Stock (or the Common Stock issued upon conversion thereof) of the Company. For
purposes of this Section 3.3, Major Investor includes any general partners and
affiliates of a Major Investor. An investor shall be entitled to apportion the
right of first offer hereby granted it among itself and its partners and
affiliates as it deems appropriate.

              Each time the Company proposes to offer any shares of, or
securities convertible into or exercisable for any shares of, any class of its
capital stock ("Shares"), the Company shall first make an offering of such
Shares to each Major Investor in accordance with the following provisions:



                                       13
<PAGE>   16

                  (a) The Company shall deliver a notice by certified mail
("Notice") to the Major Investors stating (i) its bona fide intention to offer
such Shares, (ii) the number of such Shares to be offered, and (iii) the price
and terms, if any, upon which it proposes to offer such Shares.

                  (b) By written notification received by the Company, within
twenty (20) calendar days after giving of the Notice, the Major Investor may
elect to purchase or obtain, at the price and on the terms specified in the
Notice, up to that portion of such Shares which equals the proportion that the
number of shares of common stock issued and held, or issuable upon conversion of
the Preferred Stock then held, by such Major Investor bears to the total number
of shares of Common Stock of the Company then outstanding (assuming full
conversion of all convertible securities issued or held, or issuable upon
conversion of the Series A Preferred Stock and Series B Preferred Stock and
Series C Preferred Stock then held, by all the Major Investors). The Company
shall promptly, in writing, inform each Major Investor which purchases all the
shares available to it ("Fully-Exercising Holder") of any other Major Investor's
failure to do likewise. During the ten-day period commencing after such
information is given, each Fully-Exercising Holder shall be entitled to obtain
that portion of the Shares for which Major Investors were entitled to subscribe
but which were not subscribed for by the Major Investors which is equal to the
proportion that the number of shares of common stock issued and held, or
issuable upon conversion of the Preferred Stock then held, by such
Fully-Exercising Holder bears to the total number of shares of common stock
issued and held, or issuable upon conversion of the Preferred Stock then held,
by all Fully-Exercising Holders who wish to purchase some of the unsubscribed
shares.

                  (c) If all Shares referred to in the Notice which Major
Investors are entitled to obtain pursuant to subsection 3.3(b) hereof are not
purchased by such Major Investors, the Company may, during the thirty (30) day
period following the expiration of the period provided in subsection 3.3(b)
hereof, offer the remaining unsubscribed portion of such Shares to any person or
persons at a price not less than, and upon terms no more favorable to the
offeree than those specified in the Notice. If the Company does not enter into
an agreement for the sale of the Shares within such period, or is such agreement
is not consummated within thirty (30) days of the execution thereof, the right
provided hereunder shall be deemed to be revived and such Shares shall not be
offered unless first reoffered to the Major Investors in accordance herewith.

                  (d) The right of first offer in this paragraph 3.3 shall not
be applicable (i) to the issuance or sale of not to exceed One Million Eight
Hundred Fifty Thousand (1,850,000) shares of common stock (or options therefor)
to employees for the primary purpose of soliciting or retaining their
employment, (ii) to or after consummation of a bone fide, firmly underwritten
public offering of shares of common stock, registered under the Act pursuant to
a registration statement on Form S-1, at an offering price of at least $12.00
per share (appropriately adjusted for any stock split, dividend, combination or
other recapitalization) and $7,500,000 in the aggregate, (iii) the issuance of
securities pursuant to the conversion or exercise of convertible or exercisable
securities, (iv) the issuance of securities in connection with a bona fide
business acquisition of or by the Company, whether by merger, consolidation,
sale of assets, sale or exchange of stock or otherwise or (v) the issuance of
stock, warrants or other securities or



                                       14
<PAGE>   17

rights to persons or entities with which the Company has business relationships
provided such issuances are for other than primary equity financing purposes.

                  (e) The right of first refusal set forth in this Section 3.3
may not be assigned or transferred, except that (i) such right is assignable by
each Major Investor to any wholly owned subsidiary or parent of, or to any
corporation or entity that is, within the meaning of the Act, controlling,
controlled by or under common control with, any such Major Investor, and (ii)
such right is assignable between and among any of the Holders.

              3.4. Board Representation and Observer Rights.

                  (a) Board Representation. The Board of Directors shall be,
immediately following the Closing (as defined in the Stock Purchase Agreement),
made up of Edward O. Lanphier II, John W. Larson, Michael Wood, William Gerber,
Herbert Boyer, and one member to be chosen by the holders of a majority of
Series B and Series C Preferred Stock (the "Series B/C Director"), who shall be
reasonably acceptable to the holders of a majority of the Common Stock. With
respect to the Series B/C Director, if requested, Lombard Odier & Cie hereby
agrees to vote its shares of Series B and Series C Preferred Stock to elect as
the Series B/C Director one person designated by Stephens Group, Inc. as long as
Stephens Group, Inc. owns not less than fifty percent (50%) of the shares of the
Series C Preferred Stock it holds upon the closing of its purchase of Series C
Preferred Stock (or an equivalent amount of Common Stock issued upon conversion
thereof). Any vacancy occurring because of the death, resignation or removal of
the Series B/C Director shall be filled according to this Section 3.4(a).

                  (b) Observer Rights. So long as Stephens Group, Inc. (i) owns
not less than fifty percent (50%) of the shares of the Series C Preferred Stock
it holds upon the closing of its purchase of Series C Preferred Stock (or an
equivalent amount of Common Stock issued upon conversion thereof) and (ii) does
not appoint the Series C Director, the Company shall invite a representative of
Stephens Group, Inc. to attend, either personally or telephonically, all
meetings of its Board of Directors in a nonvoting observer capacity and, in this
respect, shall give such representative copies of all notices, minutes,
consents, and other materials that it provides to its directors; provided,
however, that such representative shall agree to hold in confidence and trust
and to act in a fiduciary manner with respect to all information so provided;
and, provided further, that the Company reserves the right to withhold any
information and to exclude such representative from any portion of any meeting
if access to such information or attendance thereat could adversely affect the
attorney-client privilege between the Company and its counsel or would result in
disclosure of confidential or proprietary information to such representative of
if such Investor or its representative is a direct competitor of the Company.

              3.5. Termination of Covenants. The covenants set forth in this
Section 3 shall terminate and be of no further force or effect upon the
consummation of the sale of securities pursuant to a registration statement
filed by the Company under the Act in connection with the firm commitment
underwritten offering of its securities to the general public.



                                       15
<PAGE>   18

        4. Miscellaneous.

              4.1. Successors and Assigns. Except as otherwise provided herein,
the terms and conditions of this Agreement shall inure to the benefit of and be
binding upon the respective successors and assigns of the parties (including
transferees of any shares of Registrable Securities). Nothing in this Agreement,
express or implied, is intended to confer upon any party other than the parties
hereto or their respective successors and assigns any rights, remedies,
obligations, or liabilities under or by reason of this Agreement, except as
expressly provided in this Agreement.

              4.2. Governing Law. This Agreement shall be governed by and
construed under the laws of the State of California as applied to agreements
among California residents entered into and to be performed entirely within
California.

              4.3. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

              4.4. Titles and Subtitles. The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

              4.5. Notices. All notices or other communications hereunder shall
be in writing (including by facsimile transmission) and mailed, sent or
delivered to the respective parties hereto at or to their respective addresses
or facsimile numbers set forth below their names on the signature pages hereof,
or at or to such other address or facsimile number as shall be designated by any
party in a written notice to the other parties hereto. All such notices and
other communications shall be effective (i) if delivered by hand, when
delivered; (ii) if sent by mail, upon the earlier of the date of receipt or five
business days after deposit in the mail, first class (or, if to international
addresses, by express courier); and (iii) if sent by facsimile transmission,
when sent.

              4.6. Expenses. If any action at law or in equity is necessary to
enforce or interpret the terms of this Agreement, the prevailing party shall be
entitled to reasonable attorneys' fees, costs and necessary disbursements in
addition to any other relief to which such party may be entitled.

              4.7. Amendments and Waivers. Any term of this Agreement may be
amended and the observance of any term of this Agreement may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the holders of
a majority of the Registrable Securities then outstanding. Any amendment or
waiver effected in accordance with this paragraph shall be binding upon each
holder of any Registrable Securities then outstanding, each future holder of all
such Registrable Securities, and the Company.

              4.8. Severability. If one or more provisions of this Agreement are
held to be unenforceable under applicable law, such provision shall be excluded
from this Agreement and



                                       16
<PAGE>   19

the balance of the Agreement shall be interpreted as if such provision were so
excluded and shall be enforceable in accordance with its terms.

              4.9. Aggregation of Stock. All shares of Registrable Securities
held or acquired by affiliated entities or persons shall be aggregated together
for the purpose of determining the availability of any rights under this
Agreement.

              4.10. Entire Agreement; Amendment; Waiver. This Agreement
(including the Schedules hereto) constitutes the full and entire understanding
and agreement between the parties with regard to the subjects hereof and
thereof.



                                       17
<PAGE>   20

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SANGAMO BIOSCIENCES, INC.

                                       By:
                                          ------------------------------------
                                          Edward O. Lanphier II, President








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   21

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       COMMON STOCKHOLDER

                                       ------------------------------------
                                       Edward O. Lanphier II








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   22

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       COMMON STOCKHOLDER

                                       ------------------------------------
                                       Michael C. Wood








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   23

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SERIES A PREFERRED STOCKHOLDER

                                       ------------------------------------
                                       John W. Larson








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   24

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                             SERIES B AND SERIES C PREFERRED
                             STOCKHOLDER

                             JAFCO CO., LTD

                             By:
                                ------------------------------------
                                Mitsumasa Murase, President

                             JAFCO R-3 INVESTMENT ENTERPRISE PARTNERSHIP
                             JAFCO JS-3 INVESTMENT ENTERPRISE PARTNERSHIP
                             JAFCO G-6 (A) INVESTMENT ENTERPRISE PARTNERSHIP
                             JAFCO G-6 (B) INVESTMENT ENTERPRISE PARTNERSHIP
                             JAFCO G-7 (A) INVESTMENT ENTERPRISE PARTNERSHIP
                             JAFCO G-7 (B) INVESTMENT ENTERPRISE PARTNERSHIP



                             By:
                                ------------------------------------
                                Mitsumasa Murase, President
                                JAFCO Co., Ltd.
                                Executive Partner








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   25

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SERIES B AND SERIES C PREFERRED
                                       STOCKHOLDER

                                       LOMBARD ODIER & CIE

                                       By:
                                       Name:    ________________________________
                                       Title:   ________________________________








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   26

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SERIES C PREFERRED STOCKHOLDER

                                       HALIFAX FUND LP

                                       By:  The Palladin Group L.P.
                                            as Investment Manager

                                       By:
                                          ------------------------------------
                                            Robert L. Chender








                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   27

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SERIES C PREFERRED STOCKHOLDER

                                       STEPHENS-SANGAMO BIOSCIENCES LLC

                                       By:
                                          ------------------------------------









                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   28

        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


                                       SERIES C PREFERRED STOCKHOLDER

                                       WILLIAM J. RUTTER

                                       By:
                                          ------------------------------------









                            SANGAMO BIOSCIENCES, INC.
                 SIGNATURE PAGE TO INVESTORS' RIGHTS AGREEMENT


<PAGE>   29

                                   SCHEDULE A

                               SCHEDULE OF HOLDERS

                            SERIES A PREFERRED STOCK


<TABLE>
<CAPTION>
            Holders                                     Shares of Series A Preferred Stock
            -------                                     ----------------------------------
<S>                                                     <C>
Alan J. Cohen                                                        25,000
Kenneth R. Kaszerman and Greg Moore                                  25,000
Robert W. Pittman                                                    50,000
Joseph Abrams Family Partnership,                                    75,000
ID #22-3191401
Peter Graf                                                          100,000
Steven Richman                                                      100,000
Peter M. Waldschutz                                                  50,000
Barry M. Weintraub, M.D., Profit Sharing Plan                        25,000
DLJSC Cust fbo Barry M. Weintraub TTEE
Bart M. Pasternak                                                    50,000
Altschul Investment Group                                            75,000
Arthur G. Altschul                                                   25,000
John W. Larson                                                       75,000
Thomas J. Marron                                                     25,000
von Reis/Altschul Family Partnership                                 50,000
</TABLE>


<PAGE>   30

                            SERIES B PREFERRED STOCK

<TABLE>
<CAPTION>
                                                                       Shares of Series B
Holders                                                                  Preferred Stock
- -------                                                                  ---------------
<S>                                                                    <C>
JAFCO Co, Ltd.                                                              200,000

JAFCO R-3 Investment Enterprise Partnership                                 136,986

JAFCO JS-3 Investment Enterprise Partnership                                 82,194

JAFCO G-6 (A) Investment Enterprise Partnership                             123,287

JAFCO G-6 (B) Investment Enterprise Partnership                             123,287

JAFCO G-7 (A) Investment Enterprise Partnership                             167,123

JAFCO G-7 (B) Investment Enterprise Partnership                             167,123

W. Patrick McMullan                                                          16,667

Lawrence N. Lavine                                                           16,667

Tusher Family Limited Partnership                                            33,820

Robert and Jill Greenman                                                     84,548

UMB Bank, N.A. Trustee of the                                                84,548
Brobeck, Phleger & Harrison LLP
Retirement Savings Plan fbo
John W. Larson

Jon D. and Linda Gruber                                                      42,274

J. Wyatt Gruber                                                               8,455

Lindsay D. Gruber                                                             8,455

J. Patterson McBaine                                                         16,910

Overbrook Fund I, LLC                                                        45,656

Lombard, Odier & Cie                                                      1,000,000

Lehman Brothers, Inc.                                                        40,000
</TABLE>


<PAGE>   31

                            SERIES C PREFERRED STOCK

<TABLE>
<CAPTION>
                                                                       Shares of Series C
Holders                                                                  Preferred Stock
- -------                                                                  ---------------
<S>                                                                    <C>
JAFCO Co, Ltd.                                                              222,223

Lombard, Odier & Cie                                                        222,222

Halifax Fund L.P.                                                           222,222

Stephens - Sangamo BioSciences LLC                                        1,000,000

William J. Rutter                                                           333,333
</TABLE>


<PAGE>   32

                                   SCHEDULE B

                            SCHEDULE OF STOCKHOLDERS


<TABLE>
<CAPTION>
Name of Purchaser                                         Shares of Common Stock
- -----------------                                         ----------------------
<S>                                                       <C>
Edward O. Lanphier II                                              1,645,000

Michael C. Wood                                                      750,000
</TABLE>



<PAGE>   1
                                                                    EXHIBIT 10.7


                               LICENSE AGREEMENT

THIS AGREEMENT is made as of January 11, 2000 between:

1.   SANGAMO BIOSCIENCES, INC. incorporated in Delaware, United States of
     America, having an office at Point Richmond Tech Center, 501 Canal Blvd.
     Suite A100, Richmond, California 94840 (SANGAMO); and

2.   BAXTER HEALTHCARE CORPORATION incorporated in Delaware, United States of
     America, having an office at 17221 Red Hill Avenue, Irvine, California,
     92614-5686 (BAXTER).

                                    RECITALS

A.   SANGAMO is the owner or licensee of the Technology and Patent Rights (as
     defined in Clause 1.1. herein).

B.   BAXTER wishes to received an exclusive license to use and exploit the
     Technology and Patent Rights to develop and commercialize zinc finger DNA
     binding protein and gene therapy products for activation of all vascular
     endothelial growth factors ("VEGF") and VEGF receptors for the treatment of
     ischemic cardiovascular and vascular disease in humans, and SANGAMO is
     willing to grant BAXTER such a license on the terms and conditions
     contained in this Agreement.

C.   SANGAMO wishes to undertake research relating to the further development of
     its proprietary zinc finger binding protein and gene therapy technology and
     BAXTER wishes to fund such research to facilitate SANGAMO's ability to
     license such technology to BAXTER under the License Agreement. Therefore,
     BAXTER and SANGAMO have entered into a Research Funding Agreement,
     contemporaneously herewith.

     IT IS AGREED as follows.

<PAGE>   2
1.   DEFINITIONS

     The following definitions apply unless the context requires otherwise.

1.1  AFFILIATE with respect to an entity, means a person or entity which owns,
     is owned by or is under common ownership with the first-named entity. For
     the purposes of this definition, the term "owns" as used with respect to
     any person or entity means ownership (directly or indirectly) of at least
     fifty percent (50%) of the outstanding voting securities of a corporation
     or a comparable equity interest in another form of entity.

1.2  AGREEMENT means this License Agreement.

1.3  BAXTER INVENTIONS shall mean those Inventions independently conceived
     and/or reduced to practice, or written (as determined by United States
     patent or copyright law) solely by BAXTER or by an employee, consultant,
     agent or representative of BAXTER or by some other person obligated to
     assign their rights to such Invention to BAXTER or otherwise owned by
     BAXTER.

1.4  CONVERTIBLE DEBENTURES means a debenture issued by SANGAMO, substantially
     in the form of Schedule 3 hereto, accruing interest at the Prime Rate as
     published in the United States Western Edition of The Wall Street Journal
     under the heading "Money Rates" on the date of issuance, maturing on the
     fifth anniversary of the date of issuance, and convertible in accordance
     with its terms into capital stock of SANGAMO.

1.5  CROSS LICENSED PRODUCT shall mean product or device for which BAXTER or its
     Affiliate receives a (sub)license or other rights to commercialize in
     connection with the grant of a sublicense or other rights to commercialize
     a Licensed Product.

1.6  DEVELOPMENT COSTS shall mean, with respect to a Licensed Product, the sum
     of (a) the aggregate cash consideration actually paid by BAXTER to Third
     Parties to acquire licenses under pending patent applications or issued
     patents necessary in order to manufacture, having manufactured, import,
     use, sell and offer for sale such Licensed Product, plus (b) the aggregate
     out-of-pocket amounts (if any) actually paid by BAXTER to Third Parties to
     research and develop such Licensed Product for commercial sale, or to


                                      -2-
<PAGE>   3
     acquire or develop the facilities, equipment, materials and processes
     needed for GMP manufacture of such Licensed Product. Whether or not a
     pending patent application, issued patent, facility, equipment, materials
     or process is needed for purposes of this Clause 1.5 shall be determined by
     the Steering Committee: provided, however, if the Steering Committee cannot
     reach agreement, the disagreement shall be resolved pursuant to Clause 12.

1.7  EFFECTIVE DATE means the date set forth on page 1, line 1 of this
     Agreement.

1.8  ELA means Establishment License Approval to manufacture any Licensed
     Product by USFDA, or its foreign equivalent in a Major Country.

1.9  FIELD means the use of zinc finger DNA binding proteins and nucleic acids
     that encode zinc finger DNA binding proteins for the activation of VEGF and
     VEGF receptors for the treatment and prevention of ischemic cardiovascular
     and vascular disease in humans.

1.10 FIELD OF RESEARCH shall mean the development of zinc finger DNA binding
     proteins and nucleic acids that encode zinc finger DNA binding proteins for
     the activation of VEGF and VEGF receptors for the treatment and prevention
     of ischemic cardiovascular and vascular disease in humans.

1.11 FIRST COMMERCIAL SALE means the initial arms length transfer in a Major
     Country by BAXTER or BAXTER'S sub-licensee of a Licensed Product to a
     purchaser that is not an Affiliate after the date of receiving the
     applicable regulatory approval to market the Licensed Product in such Major
     Country, in exchange for cash or some equivalent to which value can be
     assigned for the purpose of determining Net Sales.

1.12 GROSS PROFITS means the Net Sales of Licensed Products, less the sum of (a)
     the actual cost of raw materials and (b) the other production costs
     (allocated in accordance with generally accepted accounting principles
     consistently applied to all products produced by the producer) incurred in
     bringing the Licensed Products to the point of sale.

1.13 IND means Investigational New Drug application in the United States or its
     foreign equivalent in a Major Country, and a reference to the submission
     thereof is a reference to

                                      -3-
<PAGE>   4
           the submission of such application with the USFDA or the equivalent
           submission with the applicable foreign regulatory authority of a
           Major Country.

     1.14  INVENTION(S) as used herein shall include, without restriction or
           limitation, any and all devices, products, compositions or matter,
           chemical formulations, computer software, or processes (including
           without limitation processes for making or using devices or
           compositions of matter), whether patentable or unpatentable, and any
           and all written materials or other works which may be subject to
           copyright, which are reduced to practice, conceived or written during
           the term of the Research Funding Agreement and for ninety (90) days
           after it expires, and result from the performance of the Sponsored
           Research.

     1.15  INVENTION PATENTS as used herein shall include any patent or patent
           application covering an Invention in any country (including any
           additions, divisions, continuations, continuations-in-part, reissues,
           re-examinations, inventors' certificates, registrations or extensions
           of the said patents or patent applications and any supplementary
           protection certificates issued in connection with any of the said
           patents or patent applications).

     1.16  JOINT INVENTIONS shall mean those Inventions jointly conceived and/or
           reduced to practice, or written (as determined by United States
           patent or copyright law) by, on the one hand, either an employee,
           consultant, agent, or representative of SANGAMO or some other person
           obligated to assign their rights to such invention to SANGAMO, and,
           on the other hand, BAXTER or an employee, consultant, agent, or
           representative of BAXTER or by some other person obligated to assign
           their rights to such Invention to BAXTER, or otherwise jointly owned
           by SANGAMO and BAXTER.

     1.17  JOINTLY INVENTED LICENSED PRODUCT shall mean a pharmaceutical product
           (in final dosage, packaged and labeled form) comprising a ZFP, the
           manufacture, use, offer for sale, sale or import of which falls
           within the scope of one or more claims of a pending patent
           application or issued and unexpired patent within the Inventions
           Patents covering Joint Inventions which has not been permanently
           revoked, held unenforceable or invalid by a decision of a court or
           other governmental agency of competent jurisdiction, unappealable or
           unappealed within the time allowed for appeal, and which has not been



                                      -4-

<PAGE>   5
           admitted to be invalid or unenforceable through reissue or disclaimer
           or otherwise, provided that such product is not otherwise a Licensed
           Product.

     1.18  JOINTLY INVENTED LICENSE COMBINATION PRODUCT shall mean any
           pharmaceutical product (in final dosage, packaged and labeled form)
           that consists of a Jointly Invented Licensed Product and parts of
           other products such as, for example, biological or mechanical drug
           delivery systems or vehicles, including but not limited to devices or
           biological systems for enhancing the performance of the Jointly
           Invented Licensed Product, the local delivery of the Jointly Invented
           Licensed Product, or the sustained expression of the Jointly Invented
           Licensed Product.

     1.19  LICENSE FEE means any amount payable by BAXTER to SANGAMO pursuant to
           this Agreement.

     1.20  LICENSED PRODUCT means any of a Jointly Invented Licensed ZFP
           Product, Jointly Invented Licensed ZFP Combination Product, Licensed
           ZFP Product or Licensed ZFP Combination Product. For clarification
           purposes, a Subsequent Licensed Product shall be a Licensed Product.

     1.21  LICENSED ZFP PRODUCT means any pharmaceutical product (in final
           dosage, packaged and labeled form) comprising a ZFP, the manufacture,
           use, offer for sale, sale or import of which falls within the scope
           of one or more claims of a pending patent application or issued and
           unexpired patent within the Patent Rights, which has not been
           permanently revoked, held unenforceable or invalid by a decision of a
           court or other governmental agency of competent jurisdiction,
           unappealable or unappealed within the time allowed for appeal, and
           which has not been admitted to be invalid or unenforceable through
           reissue or disclaimer or otherwise.

     1.22  LICENSED ZFP COMBINATION PRODUCT means any pharmaceutical product (in
           final dosage, packaged and labeled form) that consists of the
           Licensed ZFP Product and parts of other products such as, for
           example, biological or mechanical drug delivery systems or vehicles,
           including but not limited to devices or biological systems for
           enhancing the

                                      -5-
<PAGE>   6
           performance of the Licensed ZFP Product, the local delivery of the
           Licensed ZFP Product, or the sustained expression of the Licensed ZFP
           Product.

     1.23  MAJOR COUNTRY means either the United States of American or any three
           countries of the European Union.

     1.24  MARKETING APPROVAL means the granting of marketing approval for any
           Licensed Product by the USFDA or the applicable foreign regulatory
           authority in a Major Country.

     1.25  NET SALES means gross invoiced sales price from sales of any Licensed
           Product by BAXTER, its Affiliate or sub-licensee of BAXTER to a
           purchaser that is not an Affiliate (other than to an Affiliate that
           is an end user), less reasonable and customary deductions for (a)
           transportation charges, including insurance relating thereto; (b)
           sales and excise taxes or customs duties paid by the party selling or
           distributing such Licensed Product or any other governmental charges
           imposed upon the sale or distribution of such Licensed Product; and
           (c) returns, or allowances in lieu of returns, quantity discounts,
           cash discounts or chargebacks actually granted, allowed or incurred
           in the ordinary course of business in connection with the sale or
           distribution of such Licensed Product. Notwithstanding the foregoing,
           if BAXTER does not receive in the ordinary course of business, from
           an Affiliate to whom BAXTER sells or otherwise transfers a Licensed
           Product for resale in any country, the foregoing itemized gross sales
           and deductions data regarding a Licensed Product, then "Net Sales"
           shall mean, with respect to such Affiliate and such Licensed Product
           (on a per unit basis) sold in such country, the average per unit
           sales price, less the above types of deductions (the "average net
           sales price"), by such Affiliate of such Licensed Product in such
           country (if reported) or otherwise in the geographic region in which
           such country is located; provided, however, that the average net
           sales price shall be calculated in accordance with generally accepted
           accounting principles consistently applied in the United States,
           shall be the same as the average net sales price by such Affiliate in
           such country or region (as applicable) used for purposes of preparing
           BAXTER's consolidated financial statements, and shall not materially
           differ from the calculation of Net Sales by BAXTER itemized above.

                                      -6-

<PAGE>   7
1.26 NET SUBLICENSE REVENUES shall mean, with respect to a Licensed Product, the
     Sublicense Revenues for such Licensed Product, less the sum of (a) fifty
     percent (50%) of the aggregate milestone payments actually paid to SANGAMO
     pursuant to Clauses 4.2.1(b) and 4.2.1(c) for such Licensed Product, (b)
     two hundred percent (200%) of the aggregate royalties actually paid to
     SANGAMO pursuant to Clause 4.3.1 for such Licensed Product, and (c) fifty
     percent (50%) of the Development Costs for such Licensed Product.

1.27 PATENT RIGHTS means (i) the SANGAMO Patent Applications, (ii) any patent or
     patent application owned by or licensed to SANGAMO which discloses or
     claims a ZFP or methods of producing or using ZFP in the Field, and (iii)
     any patent subsequently issued on any or all of (i) or (ii) in any country
     (including any additions, divisions, continuations, continuations-in-part,
     reissues, re-examinations, inventors' certificates, registrations or
     extensions of the said patents or patent applications and any supplementary
     protection certificates issued in connection with any of the said patents
     or patent applications), in each case that are owned by SANGAMO or licensed
     to SANGAMO with the right to grant sublicenses during the term of this
     Agreement.

1.28 PHASE 1 CLINICAL TRIALS has the same meaning as the term has in the United
     States Code of Federal Regulations or its foreign equivalent in a Major
     Country.

1.29 PHASE 2 CLINICAL TRIALS has the same meaning as that term in the United
     States Code of Federal Regulations or its foreign equivalent in a Major
     Country.

1.30 PHASE 3 CLINICAL TRIALS has the same meaning as that term has in the United
     States Code of Federal Regulations or its foreign equivalent in a Major
     Country.

1.31 RESEARCH FUNDING AGREEMENT shall mean the Research Funding Agreement
     entered into between BAXTER and SANGAMO contemporaneously herewith (as
     amended or restated from time to time).

1.32 SANGAMO INVENTIONS shall mean those Inventions independently conceived
     and/or reduced to practice, or written (as determined by United States
     patent or copyright law) solely by SANGAMO or by an employee, consultant,
     agent or representative of


                                      -7-

<PAGE>   8
     SANGAMO or by some other person obligated to assign their rights so such
     Inventions to SANGAMO or otherwise owned by SANGAMO.

1.33 SANGAMO PATENT APPLICATIONS means any patents and patent applications
     described in Schedule 1.

1.34 SPONSORED RESEARCH shall mean those research activities to be performed
     within the Field Of Research, and in accordance with a Research Plan
     specifically set forth in Exhibit A to the Research Funding Agreement.

1.35 STEERING COMMITTEE means the Committee appointed pursuant to clause 7.2.1.

1.36 SUBLICENSE REVENUES shall mean, with respect to a Licensed Product, the
     aggregate cash consideration, plus the fair market value of the aggregate
     cash equivalents and securities, owing to BAXTER and its Affiliates in
     connection with the grant of such sublicense or other rights to
     commercialize such Licensed Product. If the parties fail to reach mutually
     acceptable agreement on the fair market value of any such cash equivalents
     or securities, the disagreement shall be resolved in accordance with Clause
     12.

1.37 SUBSEQUENT LICENSED PRODUCT shall mean a Licensed Product that comprises a
     ZFP intended for use in the treatment or prevention of a clinical
     indication in the Field, other than coronary or peripheral vascular
     disease, and that is different than any Licensed Product which previously
     reached the point of First Commercial Sale.

1.38 TECHNOLOGY means any and all technical data, information, materials,
     know-how and trade secrets (including but not limited to, the biological
     materials and other materials used by SANGAMO for purifying or producing
     ZFPs), regarding ZFPs or methods of purifying, producing, or using ZFPs in
     the Field, which is owned by SANGAMO or licensed to SANGAMO with the right
     to grant sublicenses during the term of this Agreement.


1.39 TERRITORY means the entire world.

1.40 THIRD PARTY means any party other than SANGAMO or BAXTER.


                                      -8-

<PAGE>   9
1.41   USFDA means the Food and Drug Administration of the United States of
       America.

1.42   ZFP means any zinc finger DNA binding protein, or any nucleic acid that
       encodes for a zinc finger DNA binding protein, that is developed,
       licensed or acquired by SANGAMO for use in the Field pursuant to the
       Research Funding Agreement or this Agreement.


2.     REPRESENTATIONS AND WARRANTIES

2.1    PATENT MATTERS

       (a)   As of the Effective Date:

             (i)    SANGAMO warrants and represents that, except as SANGAMO
                    otherwise has advised BAXTER in writing prior to the
                    Effective Date, it has not received written notice from any
                    Third Party that any composition, process or use claimed by
                    the Patent Rights infringes an issued patent of such Third
                    Party;

             (ii)   SANGAMO warrants and represents that (A) it has conducted
                    searches of public databases for issued patents and
                    published Third Party patent applications that contain the
                    words "zinc finger" or "nucleic acid binding proteins" in
                    the title or abstract, and (B) that it has disclosed to
                    BAXTER all issued patents and published Third Party patent
                    applications that have been disclosed to SANGAMO in the
                    results of such searches.

             (iii)  SANGAMO warrants and represents that it has no actual
                    knowledge (without any duty of inquiry) of any current
                    action conducted by a Third Party which is or would
                    constitute an infringement of the Patent Rights in the
                    Field;

             (iv)   BAXTER has had the opportunity to review such materials and
                    to ask such questions of SANGAMO and its advisors, as BAXTER
                    deems necessary or appropriate, regarding the Patent Rights.
                    SANGAMO warrants and represents that such materials provided
                    to BAXTER and responses to such inquiries did not contain
                    any untrue statement of a


                                      -9-
<PAGE>   10
                    material fact or omit to state any material fact necessary
                    in order to make the statements made therein, in light of
                    the circumstances under which they were made, not
                    misleading; and

             (v)    SANGAMO warrants and represents that it has reviewed its
                    intellectual property portfolio and believes that there
                    are no other patents or patent applications owned by
                    SANGAMO or licensed to SANGAMO with the right to grant
                    sublicenses which would be infringed in the practice of the
                    Patent Rights in the Field in the Territory. Should it
                    later eventuate that any patent or patent application, that
                    as of the Effective Date is owned by SANGAMO or licensed to
                    SANGAMO with the right to grant sublicenses, would be
                    infringed in the practice of the Patent Rights in the Field
                    in the Territory, then that patent or patent application
                    shall be deemed to be licensed to BAXTER as part of the
                    Patent Rights under this Agreement but only to the extent
                    necessary for BAXTER to exercise the license rights granted
                    to it under this Agreement.

2.2    OTHER SANGAMO REPRESENTATIONS AND WARRANTS

       (a)   SANGAMO warrants and represents regarding the Patent Rights and
             Technology, that it owns or has a license to the Patent Rights and
             Technology, that it has the legal power to extend the rights
             granted to BAXTER under this Agreement, that this Agreement
             constitutes a binding agreement enforceable against SANGAMO in
             accordance with its terms, and that it has not made any
             commitments to others regarding ZFP in respect of the Patent
             Rights and/or Technology in the Field that would conflict with
             such rights.

       (b)   SANGAMO warrants and represents that it has disclosed to BAXTER all
             technical data and other information owned or known by SANGAMO as
             of the Effective Date regarding the safety and efficacy of zinc
             finger DNA binding proteins in the Field.




                                      -10-
<PAGE>   11
2.3    BAXTER REPRESENTATIONS AND WARRANTIES

       BAXTER warrants and represents that it has the legal power to enter into
       this Agreement, that this Agreement constitutes a binding agreement
       enforceable against BAXTER in accordance with its terms, and that is has
       not made any commitments to others that would conflict with its
       obligations under this Agreement.

3.     LICENSE AND OPTION

3.1    GRANT OF LICENSE AND OPTION

       (a)   The parties hereby acknowledge that, pursuant to the Research
             Funding Agreement, BAXTER has assigned to SANGAMO any and all of
             its rights to BAXTER Inventions and to Joint Inventions, including
             all rights under the patent, copyright and other intellectual
             property laws of the United States or any other country.

       (b)   SANGAMO hereby grants to BAXTER an exclusive license including the
             right to sub-license pursuant to Clause 3.2 under the Patent
             Rights, the Technology, and under Invention Patents and Inventions
             (other than Inventions Patents to the extent they claim BAXTER
             Inventions, and other than BAXTER Inventions) to manufacture, have
             manufactured, import, use, sell and offer for sale Licensed
             Products for use in the Field throughout the Territory for the term
             of this Agreement. During the term of this Agreement, SANGAMO shall
             not grant to any Third Party any license under the Patent Rights,
             technology, Invention Patents or Inventions for use in the Field in
             the Territory.

       (c)   SANGAMO hereby grants to BAXTER an exclusive, perpetual,
             royalty-free license, including the exclusive right to sub-license,
             under the Invention Patents to the extent they claim BAXTER
             Inventions and under BAXTER Inventions for all purposes throughout
             the Territory; provided, however, that SANGAMO reserves the right
             thereunder to conduct its obligations and exercise its rights under
             this Agreement.


                                      -11-
<PAGE>   12
     (d)  SANGAMO hereby grants to BAXTER a non-exclusive, perpetual,
          royalty-free license, including the right to sub-license, under the
          Invention Patents to the extent they claim Joint Inventions and under
          Joint Inventions for all purposes throughout the Territory for the
          term of this Agreement, other than to manufacture, have manufactured,
          import, use, sell and offer for sale Licensed Products for use in the
          Field throughout the Territory for the term of this Agreement.

     (e)  SANGAMO hereby grants to BAXTER the exclusive option, exercisable for
          a period of eighteen (18) months after the Effective Date, to purchase
          a Convertible Debenture having a face amount of Seven Million Five
          Hundred Thousand Dollars ($7,500,000) pursuant to a Convertible
          Debenture Purchase Agreement substantially in the form of the similar
          agreement between the parties entered into concurrently herewith. Such
          option is exercisable by BAXTER giving express written notice to
          SANGAMO of its desire to exercise such option, and paying to SANGAMO
          the sum of Seven Million Five Hundred Thousand Dollars ($7,500,000)
          prior to the expiration of such option. If BAXTER timely exercises
          such option and purchases such Convertible Debenture, SANGAMO shall
          grant to BAXTER a right of first refusal, for a period of three (3)
          years after the date of the issuance of such Convertible Debenture, to
          obtain an exclusive license under the Patent Rights and the Technology
          for use throughout the Territory in the field of treatment and
          prevention of any and all cardiovascular and vascular disease in
          humans, including, but not limited to, pro-angiogenic therapies,
          anti-restenosis and congestive heart failure.

     (f)  BAXTER shall not use the Patent Rights, Technology, Invention Patents
          or Inventions for any purpose for which it is not expressly licensed
          hereunder.

     (g)  Except as otherwise expressly set forth in this Agreement, neither
          party grants to the other party any license, immunity or other right
          under the such party's patent rights, other intellectual property
          rights or technology, whether by implication or otherwise, for any
          purpose.


                                      -12-
<PAGE>   13
     (h)  If BAXTER becomes aware of any pending patent applications or issued
          patents of a Third Party that claim ZFPs or their use in the Field,
          BAXTER promptly shall advise SANGAMO thereof. As between BAXTER and
          SANGAMO, SANGAMO shall have the first right, but not the obligation
          (at its option in its sole discretion), to obtain a license from such
          Third Party under such pending patent applications and issued
          patents, and shall use its commercially reasonable efforts to obtain
          a license (with the right to grant a sublicense to BAXTER) for use in
          the Field, in each case on terms and conditions acceptable to
          SANGAMO. If SANGAMO obtains such a license (with the right to grant a
          sublicense to BAXTER) for use in the Field, then such pending patent
          applications and issued patents shall be subject to this Agreement.
          If SANGAMO elects not to seek, or fails to obtain, such a license
          (with the right to grant a sublicense to BAXTER) for use in the
          Field, then BAXTER shall have the right, but not the obligation (at
          its option in its sole discretion), to obtain a license from such
          Third Party under such pending patent applications and issued patents
          on terms and conditions acceptable to BAXTER.

3.2  CERTAIN RESTRICTIONS ON SUB-LICENSES

     BAXTER's right to sublicense the rights granted under Clauses 3.1 to a
     Third Party shall be subject to the following:

     (a)  BAXTER shall inform SANGAMO of any sublicense under Clauses 3.1 and
          shall provide SANGAMO, after the grant of such sublicense, a copy of
          such sublicense subject to the confidentiality provisions of this
          Agreement; and

     (b)  Any sublicense granted under Clauses 3.1 shall be subject to the
          terms and conditions of this Agreement and shall have terms and
          conditions which are consistent with the terms and conditions of this
          Agreement.

3.3  DESIGN OF ZFPS AFTER THE SPONSORED RESEARCH

     (a)  At any time during the term of this Agreement after the termination
          of the Research Funding Agreement, upon the reasonable request of
          BAXTER,

                                      -13-

<PAGE>   14
     SANGAMO shall design, assemble and characterize (or cause to be designed,
     assembled or characterized) one or more zinc finger DNA binding proteins
     for the activation of VEGF or VEGF receptors for the treatment or
     prevention of ischemic cardiovascular and vascular disease in humans, in
     addition to those developed under the Sponsored Research, and shall deliver
     to BAXTER such zinc finger DNA binding protein and/or the nucleic acid that
     encodes therefor. On or after delivery of such zinc finger DNA binding
     protein and/or the nucleic acid, SANGAMO shall invoice BAXTER an amount not
     to exceed     *     *     *     *     *     *    of the fully-burdened cost
     to SANGAMO therefor, and BAXTER shall pay such invoice promptly following
     receipt of such invoice.

(b)  The parties hereto expressly acknowledge and agree that the intellectual
     property licensed to BAXTER by this Agreement is unique and unavailable
     from any source other than SANGAMO and that in the event of SANGAMO's
     breach of its obligations under Paragraph 3.3 or of the exclusivity of the
     rights granted to BAXTER hereunder, money damages will not adequately
     compensate BAXTER for the losses that it would sustain due to BAXTER's
     inability to then realize the benefit of this Agreement. Therefore, the
     parties expressly acknowledge and agree that, in the event of such uncured
     breach, BAXTER shall be entitled to equitable relief in the form of
     specific performance or other mandatory or prohibitory injunction in order
     to allow BAXTER to enforce such terms of this Agreement to either require
     SANGAMO to design, assemble and characterize (or cause to be designed,
     assembled or characterized) one or more zinc finger DNA binding proteins
     for the activation of VEGF or VEGF receptors for the treatment or
     prevention of ischemic cardiovascular and vascular disease in humans, or,
     at BAXTER's option, the right of BAXTER itself to design, assemble and
     characterize one or more zinc finger DNA binding proteins for the
     activation of VEGF or VEGF receptors for the treatment or prevention of
     ischemic cardiovascular and vascular disease in humans; provided, however,
     that the subsequent making, using, offering for sale, selling or importing
     of such zinc finger DNA binding proteins shall be limited to the scope of
     the license granted hereunder. If the event of such uncured breach, upon
     the written request of

                                      -14-

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  the Commission. Confidential treatment has been requested with respect to the
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<PAGE>   15
BAXTER, SANGAMO shall promptly deliver to BAXTER any intellectual property
and/or know-how or any other information which is in the control of SANGAMO and
which BAXTER reasonably needs or requires to allow BAXTER itself to design,
assemble and characterize zinc finger DNA binding proteins and/or the nucleic
acid that encodes therefor; provided, however, that the subsequent making,
using, offering for sale, selling or importing of such zinc finger DNA binding
proteins shall be limited to the scope of the licenses granted hereunder. BAXTER
shall be relieved from any payment obligation to SANGAMO under Paragraph 3.3 for
zinc finger DNA binding proteins which BAXTER designs, assembles or
characterizes after such uncured breach.

3.4    TRANSFER OF CERTAIN MATERIALS

       Upon request, SANGAMO shall deliver to BAXTER the materials (including
       but not limited to biological materials such as cell lines, master cell
       banks, transformed vectors and antibodies) and information that (a) are
       owned by SANGAMO or licensed to SANGAMO with the right to grant
       sublicenses, and (b) are needed for GMP production and/or purification of
       ZFP, or improve the yield of production, increase the purity or decrease
       the cost of production of ZFP (based on SANGAMO's then current state of
       the art). Such materials and information shall be included within the
       definition of Technology and shall be subject to the licenses granted by
       SANGAMO to BAXTER hereunder.

4.     PAYMENTS BY BAXTER

4.1    METHOD OF PAYMENT

       All payments due by BAXTER to SANGAMO pursuant to this Agreement shall be
       payable in the currency of the United States of America and shall be paid
       by wire transfer into such accounts as SANGAMO may direct.

4.2    CONVERTIBLE DEBENTURE AND MILESTONE PAYMENTS

       4.2.1 In consideration for the rights acquired under this Agreement:


                                      -15-

<PAGE>   16
      (a)   On or before January 21, 2000, BAXTER shall pay to SANGAMO the sum
            of Five Million Dollars ($5,000,000) in consideration for the
            purchase of a Convertible Debenture having a face amount of Five
            Million Dollars ($5,000,000).

      (b)   Within thirty (30) days of the first achievement of each of the
            following events or the respective date described, BAXTER shall pay
            SANGAMO the following milestone payments:

     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *


                                      -16-

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<PAGE>   17
                      *     *     *     *     *    *     *     *     *     *
                      *     *     *     *     *    *     *     *     *     *
                      *     *     *     *     *    *     *     *     *     *

      (c)   With respect to each Subsequent Licensed Product, within thirty
            (30) days of achievement of each of the following events or the
            respective date described, BAXTER shall pay to SANGAMO the
            following milestone payments:

            *    *    *     *     *     *     *    *     *     *     *     *
                 *    *     *     *     *     *    *     *     *     *     *

            *    *    *     *     *     *     *    *     *     *     *     *
                 *    *     *     *     *     *    *     *     *     *     *
                 *    *     *     *     *     *    *     *     *     *     *

      4.2.2 For purposes of this Agreement,      *     *     *     *     *
            *    *    *     *     *     *     *    *     *     *     *     *
            *    *    *     *     *     *     *    *     *     *     *     *
            *    *    *     *     *     *     *    *     *     *     *     *
            *    *    *     *     *     *     *    *     *     *     *     *
            *    *    *     *     *     *     *    *     *     *     *     *

      4.2.3 In the event that BAXTER must license from a Third Party one or
            more pending patent applications or issued patents in order to
            manufacture, have manufactured, import, use, sell and offer for sale
            a Licensed Product in any country for use in the Field, BAXTER
            shall have the right to credit all up-front license payments and
            milestone payments actually paid to such Third Party against up to
            *     *     *     *  of each milestone payment owing to SANGAMO
            under Clause 4.2.1(b)(iv), (v) and (vi) and Clause 4.2.1(c) with
            respect to such Licensed Product. If the parties disagree whether
            or not a pending patent application or issued patent is consistent
            with the requirement set forth in this Clause 4.2.3, the
            disagreement shall be resolved pursuant to Clause 12.

      4.2.4 The calendar dates described in Clauses 4.2.1(b)(i), (ii), (iii)
            and (iv) will be subject to review, and revision if appropriate, by
            the Steering Committee as follows. The Steering Committee shall
            determine the appropriateness of such



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                                      -17-
<PAGE>   18
       calendar dates for the achievement of the applicable milestone events in
       light of the technical and commercial feasibility of the particular ZFP
       molecule being pursued at the time, and if appropriate, shall adjust such
       calendar dates as agreed by the Steering Committee.

4.3 LICENSE FEE - ROYALTY

4.3.1  In addition to the payments set out in Clause 4.2, and subject to Clause
       4.4, BAXTER shall pay to SANGAMO the following royalties based on Net
       Sales:

(a)    A royalty equal to    *     *     *  of Net Sales of Licensed ZFP
       Product, and a royalty equal to    *     *     *   of Net Sales of
       Licensed ZFP Combination Product.

(b)    A royalty equal to     *     *     * of Net Sales of Jointly Invented
       Licensed Product and a royalty equal    *     *     *     of Net Sales of
       Jointly Invented Licensed Combination Product.

(c)    In addition to the royalties set out in Clauses 4.2.1(a) and (b), for a
       period of five (5) years after the First Commercial Sale of each
       Subsequent Licensed Product, an additional royalty equal    *     *     *
       *    of Net Sales of such Subsequent Licensed Product.

4.3.2  In addition to the payments set out in Clauses 4.2 and 4.3.1, if BAXTER
       grants to a Third Party a sublicense or other rights to commercialize a
       Licensed Product prior to the first administration of such Licensed
       Product to the first enrolled and evaluable patient in the first Phase 3
       Clinical Trial for such Licensed Product, BAXTER shall pay to SANGAMO the
       following royalties:

(a)    A royalty equal to     *     *     *   of Net Sublicense Revenues of such
       Licensed Product.

(b)    A royalty equal to    *     *     *  of Net Sales of any Cross Licensed
       Product for which BAXTER or its Affiliate receives any (sub)license or
       other rights to commercialize in connection with the grant of such
       sublicense or other rights to



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                                      -18-
<PAGE>   19
       commercialize such Licensed Product. Baxter shall calculate, report and
       pay the royalties for such Cross Licensed Product hereunder in the same
       manner as if such Cross Licensed Product were a Licensed Product
       hereunder.

4.3.3  The payments due by BAXTER to SANGAMO pursuant to Clauses 4.3.1 and 4.3.2
       shall be made to SANGAMO within sixty (60) days of the end of each
       calendar quarter, and each such payment shall be accompanied by a
       reasonably detailed written report containing the calculation of the
       payment due to SANGAMO for said calendar quarter. With respect to sales
       of Licensed Products invoiced in United States dollars, the Net Sales,
       Net Sublicense Revenues and royalties payable shall be expressed in
       United States dollars. With respect to sales of Licensed Products
       invoiced in a currency other than United States dollars, the Net Sales,
       Net Sublicense Revenues and royalties payable shall be expressed in the
       domestic currency of the party making the sale together with the United
       States dollar equivalent of the royalty payable, calculated using the
       average closing buying rate for such currency quoted in the United States
       Western Edition of The Wall Street Journal under the heading "Currency
       Trading -- Exchange Rates" on last day of each month during said calendar
       quarter.

4.4 ROYALTY ADJUSTMENTS

(a)    In the event that BAXTER must license from a Third Party one or more
       pending patent applications or issued patents that claim a ZFP or the
       method of making or using a ZFP in any country in the Field, BAXTER shall
       have the right to credit one hundred percent (100%) of such Third Party
       royalty payments based upon sales of such Licensed Product in such
       country against the royalties owing to SANGAMO under Clause 4.3.1(a)
       above with respect to sales of such Licensed Product in such country;
       provided, however, that BAXTER shall not reduce, pursuant to Clauses
       4.4(a) and (b), the amount of the royalties paid to SANGAMO under Clause
       4.3.1(a) above, with respect to sales of such Licensed Product in such
       country, to less than    *    *    *   of Net Sales of such Licensed
       Product in such country.



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                                      -19-
<PAGE>   20
        (b)     In the event that BAXTER must license from a Third Party one or
                more pending patent applications or issued patents (other than
                those described in Clause 4.4(a)) in order to manufacture, have
                manufactured, import, use, sell and offer for sale a Licensed
                Product in any country for use in the Field. BAXTER shall have
                the right to credit fifty percent (50%) of such Third Party
                royalty payments based upon sales of such Licensed Product in
                such country against the royalties owing to SANGAMO under Clause
                4.3.1(a) above with respect to sales of such Licensed Product in
                such country; provided, however, that BAXTER shall not reduce,
                pursuant to Clauses 4.4(a) and (b), the amount of the royalties
                paid to SANGAMO under Clause 4.3.1(a) above, with respect to
                sales of such Licensed Product in such country, to less than   *
                *      *     of Net Sales of such Licensed Product in such
                country.

        (c)     BAXTER shall allow representatives of SANGAMO to examine any
                licenses that BAXTER asserts justify the adjustment of royalties
                to verify that any adjustments made pursuant to this Clause 4.4
                are consistent with the requirement set forth in this Clause
                4.4. SANGAMO's representatives shall not copy the license or
                licenses and must keep confidential all information, including
                royalty rates, pertaining to the license or licenses. If the
                parties disagree whether or not a pending patent application or
                issued patent is consistent with the requirement set forth in
                this Clause 4.4, the disagreement shall be resolved pursuant to
                Clause 12.

        (d)     If the manufacture, use, offer for sale, sale or import of any
                Licensed Product does not fall within the scope of one or more
                claims of an issued and unexpired patent within the Patent
                Rights or Inventions Patents (other than Inventions Patents to
                the extent they claim only BAXTER Inventions), then the
                royalties owing under Clause 4.3.1 shall be reduced by one-half
                and shall be payable only for a period of five (5) years after
                the First Commercial Sale of such Licensed Product; provided,
                however, at such later time as the manufacture, use, offer for
                sale, sale or import of any Licensed Product falls within the
                scope of one or more claims of an issued and unexpired patent
                within the Patent Rights or Inventions Patents that was pending
                on the date of the First Commercial Sale thereof (other


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                                     - 20 -




<PAGE>   21
        than Inventions Patents to the extent they claim only BAXTER
        Inventions), then the royalties owing under Clause 4.3.1 shall resume in
        full.

4.5     Records

        (a)     BAXTER shall keep, and shall cause any person to whom it has
                granted a sublicense pursuant to Clause 3.2 to keep, for a
                minimum of five (5) years, complete records of all matters which
                are relevant for determining the License Fees which are to be
                paid to SANGAMO pursuant to this Agreement.

        (b)     Upon the written request of SANGAMO and not more than once in
                each calendar year, BAXTER shall permit an independent certified
                public accounting firm of nationally recognized standing,
                selected by SANGAMO and reasonably acceptable to BAXTER, at
                SANGAMO's expense, to have access during normal business hours
                to such of the records of BAXTER as may be reasonably necessary
                to verify the accuracy of the royalty reports hereunder for any
                year ending nor more than thirty-six (36) months prior to the
                date of such request. The accounting firm shall disclose to
                SANGAMO only whether the records are correct or not and the
                specific details concerning any discrepancies. No other
                information shall be shared. If such accounting firm concludes
                that additional royalties were owed during such period, BAXTER
                shall pay the additional royalties within thirty (30) days of
                the date SANGAMO delivers to BAXTER such accounting firm's
                written report so concluding. The fees charged by such
                accounting firm shall be paid by SANGAMO; provided, however, if
                the audit discloses that the royalties payable by BAXTER for the
                audited period are more than one hundred five percent (105%) of
                the royalties actually paid for such period, then BAXTER shall
                pay the reasonable fees and expenses charged by such accounting
                firm.

5.      OBLIGATIONS OF SANGAMO AND BAXTER

5.1     SANGAMO OBLIGATIONS

        SANGAMO undertakes the following obligations as part of entering this
        Agreement:

                                     - 21 -
<PAGE>   22
      (a)   To enter into a Research Funding Agreement with BAXTER, which will
            be executed contemporaneously with this Agreement and undertake the
            activities described therein in a timely manner;

      (b)   To deliver to BAXTER the ZFP product, molecule design, and package
            design (as described in Schedule 2) and complete pre-clinical
            testing to demonstrate the performance and activity of ZFP (as
            described in Schedule 2), and to use its commercially reasonable
            efforts to do so on or before April 1, 2001;

      (c)   To disclose to BAXTER all technical data and other information owned
            or known by SANGAMO, that was not previously disclosed to BAXTER,
            regarding the safety and efficacy of the ZFPs in the Field.

      (d)   To assist BAXTER in assessing as to competency and price, and
            recommend to the Steering Committee, the preferred manufacturer of
            GMP grade ZFP for clinical trial and commercial purposes;

      (e)   To develop and deliver to BAXTER processes for preclinical
            production of ZFPs and procedures for the testing of ZFPs comprising
            Licensed Products as are reasonably necessary for the clinical
            development, the regulatory approval to manufacture and sell and the
            commercial sale of Licensed Products hereunder.

      (f)   If requested by BAXTER, (i) to transfer to a manufacturer, who is
            acceptable to the Steering Committee, has the expertise to produce
            GMP grade material and has been granted a manufacturing sublicense
            from BAXTER hereunder, such Technology as reasonably necessary for
            the manufacture of GMP grade ZFP for clinical trial and commercial
            purposes, and (ii) to provide such reasonable technical assistance
            to such manufacturer regarding the use of such Technology to permit
            such manufacturer to develop appropriate processes for the
            manufacture of GMP grade ZFP for clinical trial and commercial
            purposes;

      (g)   To produce and supply to BAXTER ZFPs of appropriate quality and in
            reasonably requested quantities sufficient to support BAXTER's
            preclinical testing activities required by the appropriate
            regulatory authorities; and


                                      -22-
<PAGE>   23
     (h)  If requested by BAXTER, to reasonably assist BAXTER in the
          preparation, filing and prosecution of all filings and submissions to
          obtain Marketing Approval and ELA for Licensed Products.

5.2  BAXTER OBLIGATIONS

     BAXTER undertakes the following obligations as part of entering this
     Agreement:

     (a)  To enter into a Research Funding Agreement with SANGAMO, which will
          be executed contemporaneously with this Agreement and to undertake
          the activities described therein in a timely manner;

     (b)  To consult and collaborate with SANGAMO to determine the clinical and
          regulatory requirements and strategy;


     (c)  To consult and collaborate with SANGAMO on the production and
          manufacture of ZFP;

     (d)  To undertake, at its sole cost, the performance of all animal
          pre-clinical testing, clinical development, regulatory activities and
          manufacture as are required for the commercialization of Licensed
          Products in the Territory for use in the Field in accordance with the
          provisions of Clause 7.1; and

     (e)  To be primarily responsible, with the reasonable assistance of
          SANGAMO, for the preparation, filing and prosecution of all filings
          and submissions to obtain Marketing Approval and ELA for Licensed
          Products.

6.   INTELLECTUAL PROPERTY

6.1  INFRINGEMENT BY THIRD PARTIES

     (a)  A party shall promptly notify the other party in writing of any
          alleged or threatened substantial and continuing infringement within
          the Field of any patent included within the Patent Rights or
          Invention Patents of which such party becomes aware.

                                      -23-

<PAGE>   24
     (b)  BAXTER shall have the right to bring and control any action or
          proceeding with respect to such alleged or threatened infringement of
          patents covering BAXTER Inventions or Joint Inventions within the
          Field, where such infringement does not also constitute
          infringement of the Patent Rights (BAXTER PROCEEDING) at its own
          expense and represented by legal advisers of its own choice.

          (i)  In the event BAXTER brings a BAXTER Proceeding or in the event
               an action is brought by a Third Party for a declaratory judgment
               that any of the patents covering BAXTER Inventions or Joint
               Inventions are not infringed or invalid (BAXTER ACTION), SANGAMO
               shall co-operate reasonably with BAXTER including, if required,
               undertaking any action or agreeing to be joined as a party to
               such BAXTER Proceeding or BAXTER Action, the reasonable costs of
               which shall be at BAXTER's expense;

               (A)  SANGAMO shall retain the right to be represented by legal
                    advisers of its own choice at its expense.

               (B)  BAXTER shall keep SANGAMO fully informed of the status of
                    such BAXTER Proceeding or BAXTER Action on a regular basis
                    or, as reasonably requested by SANGAMO, from time to time.

               (C)  In the event BAXTER brings a BAXTER Proceeding pursuant to
                    Clause 6.1(b), BAXTER shall be entitled to retain      *
                    *     *     *     of the balance of any recovery, after
                    reimbursement of reasonable attorneys' fees and costs
                    incurred by BAXTER (or for which BAXTER is required to
                    reimburse SANGAMO) in such BAXTER Proceeding, realized as a
                    result of such BAXTER Proceeding, and shall remit to
                    SANGAMO the other     *     *     *     *     .

          (ii) In the event SANGAMO notifies BAXTER in writing of any
               infringement of patents covering Joint Inventions within the
               Field referred to in

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                                      -24-
<PAGE>   25
                  Clause 6.1(b) and BAXTER fails to commence a BAXTER
                  Proceeding within a reasonable time of being so notified by
                  SANGAMO, provided that such time shall not, in any event,
                  exceed one hundred and eighty (180) days, SANGAMO may
                  commence a proceeding at its own expense and may be
                  represented by legal advisers of its own choice. In the event
                  SANGAMO brings such a proceeding, BAXTER shall provide all
                  reasonable assistance to SANGAMO, at SANGAMO's expense, in
                  relation to such proceeding and the terms set out in Clause
                  6.1(b) shall apply as if BAXTER were SANGAMO and SANGAMO were
                  BAXTER.

          (iii)   In the event SANGAMO brings a proceeding pursuant to Clause
                  6.1(b)(ii), SANGAMO shall be entitled to retain      *     *
                  *     *     *     of the balance of any recovery, after
                  reimbursement of reasonable attorneys' fees and costs
                  incurred by SANGAMO (or for which SANGAMO is required to
                  reimburse BAXTER) in such proceeding, realized as a result of
                  such proceeding, and shall remit to BAXTER the other     *
                  *     *     *    .

     (c)  SANGAMO shall have the right to bring and control any action or
          proceeding with respect to such alleged or threatened infringement of
          Patent Rights or patents covering SANGAMO Inventions within the Field
          (SANGAMO PROCEEDING) at its own expense and represented by legal
          advisers of its own choice.

          (i)     In the event SANGAMO brings a SANGAMO Proceeding or in the
                  event an action is brought by a Third Party for a declaratory
                  judgment that any of the Patent Rights or patents covering
                  SANGAMO Inventions are not infringed or invalid (SANGAMO
                  ACTION), BAXTER shall co-operate reasonably with SANGAMO
                  including, if required, undertaking any action or agreeing to
                  be joined as a party to such SANGAMO Proceeding or SANGAMO
                  Action, the reasonable costs of which shall be at SANGAMO's
                  expense;

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                                      -25-
<PAGE>   26
                  (A)  BAXTER shall retain the right to be represented by legal
                       advisers of its own choice at its own expense.

                  (B)  SANGAMO shall keep BAXTER fully informed of the status
                       of such SANGAMO Proceeding or SANGAMO Action on a
                       regular basis or, as reasonably requested by BAXTER,
                       from time to time.

                  (C)  In the event SANGAMO brings a SANGAMO Proceeding
                       pursuant to Clause 6.1(c), SANGAMO shall be entitled to
                       retain      *     *     *     *    of the balance of any
                       recovery, after reimbursement of reasonable attorneys'
                       fees and costs incurred by SANGAMO (or for which SANGAMO
                       is required to reimburse BAXTER) in such SANGAMO
                       Proceeding, realized as a result of such SANGAMO
                       Proceeding, and shall remit to BAXTER the other      *
                       *     *     *     *.


          (ii)    In the event BAXTER notifies SANGAMO in writing of any
                  infringement referred to in Clause 6.1(c) and SANGAMO fails to
                  commence a SANGAMO Proceeding within a reasonable time of
                  being so notified by BAXTER, provided that such time shall
                  not, in any event, exceed one hundred and eighty (180) days,
                  BAXTER may commence a proceeding at its own expense and may
                  be represented by legal advisers of its own choice. In the
                  event BAXTER brings such a proceeding, SANGAMO shall provide
                  all reasonable assistance to BAXTER, at BAXTER's expense, in
                  relation to such proceeding and the terms set out in Clause
                  6.1(c) shall apply as if SANGAMO were BAXTER and BAXTER were
                  SANGAMO.

          (iii)   In the event BAXTER brings a proceeding pursuant to Clause
                  6.1(c)(ii), BAXTER shall be entitled to retain      *     *
                       *      of the balance of any recovery, after
                  reimbursement of reasonable attorneys' fees and costs
                  incurred by BAXTER (or for which BAXTER is required to
                  reimburse SANGAMO) in such proceeding, realized as a result
                  of such

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                                      -26-

<PAGE>   27
                    proceeding, and shall remit to SANGAMO the other     *     *
                         *     * .

6.2  INFRINGEMENT OF THIRD PARTY RIGHTS

     6.2.1     Each party shall promptly notify the other parties in writing in
               the event that any allegation of infringement of any Third Party
               patent is raised by reason of the exercise by BAXTER or any of
               its sublicensees of any rights pursuant to Clause 3.1 or 3.2
               (ALLEGED THIRD PARTY PATENT RIGHTS). In the event that such an
               action is brought by a Third Party against BAXTER or any of its
               sublicensees of any rights pursuant to Clause 3.1 or 3.2, BAXTER,
               or any sub-licensee of BAXTER, as may be determined by BAXTER,
               shall have the right to control any defense of any such action,
               at its own expense, and to be represented by legal advisers of
               its own choice, and SANGAMO shall have the right, at its own
               expense, to be represented in any such action by legal advisers
               of its own choice. In the event of any infringement or alleged
               infringement of any Alleged Third Party Patent Rights, SANGAMO
               shall co-operate in good faith with BAXTER or any sublicensee of
               BAXTER (as the case may be) on a reasonable basis to negotiate
               and settle any dispute with a Third Party in relation to such
               infringement or alleged infringement of any Alleged Third Party
               Patent Rights, and to otherwise resolve any such infringement or
               alleged infringement and secure BAXTER's continued rights to the
               Alleged Third Party Patent Rights, if necessary or desirable.

     6.2.2     In the event that such an action is brought by a Third Party
               against BAXTER alleging the infringement by BAXTER, its Affiliate
               or sublicensee of any Third Party patent by reason of the
               manufacture, import, use, sale or offer for sale of a Licensed
               Product in any country for use in the Field, BAXTER shall be
               entitled to retain up to      *     *     *   of the license fees
               to be paid to SANGAMO pursuant to Clauses 4.2.1(b)(iv), (v) and
               (vi) and Clause 4.2.1(c) with respect to such Licensed Product,
               and up to     *     *     *  of the royalties to be paid to
               SANGAMO pursuant to Clause 4.3.1(a) with respect to


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                                      -27-

<PAGE>   28
          such Licensed Product, and to use such monies to pay for, or defray,
          the costs of defending such action for alleged infringement of such
          Third Party patents and to pay damages, reasonable attorneys' fees, or
          other costs resulting from such litigation until BAXTER has recovered
          all of its costs. During the pendency of such action for alleged
          infringement of such Third Party patents, BAXTER shall submit
          quarterly written reports showing royalties accruing to SANGAMO and
          the expenses of defending itself against such claims of alleged
          infringement. Upon termination of all proceedings or actions
          involving such defense, BAXTER shall remit the unused balance, if
          any, of the license fees and royalties accrued but not yet paid to
          SANGAMO. Notwithstanding anything to the contrary in this Agreement,
          (a) BAXTER shall not be entitled to reduce the amount of any license
          fee owing to SANGAMO under Clauses 4.2.1(b)(iv), (v) and (vi) or
          Clause 4.2.1(c) with respect to such Licensed Product by more than
               *     *     *   in the aggregate under this Clause 6.2.2 and
          Clause 4.2.3, and (b) BAXTER shall not be entitled to reduce the
          amount of any royalties owing to SANGAMO under Clause 4.3.1(a) with
          respect to such Licensed Product to less than     *     *     * of Net
          Sales of such Licensed Product after giving effect to this Clause
          6.2.2 and Clause 4.4.

6.3  PROSECUTION AND MAINTENANCE OF PATENT RIGHTS AND INVENTION PATENTS

     (a)  Except as further provided herein, SANGAMO shall be responsible, at
          its sole cost, for filing and prosecuting to issuance patent
          applications, for filing and prosecuting all patent re-issues and
          re-examinations, for applying for and obtaining any patent term
          extensions, and for paying all maintenance fees on all patents,
          relating to the Patent Rights and the Inventions Patents (other than
          Inventions Patents that claim BAXTER Inventions). SANGAMO shall
          promptly make available to BAXTER copies of all relevant
          patent-related documents, including all documents received from or
          filed with a national or international patent office, and shall
          consult with BAXTER regarding the preparation and prosecution of
          applications. BAXTER shall have the right to comment upon preparation
          and prosecution strategies and to request desired claims. SANGAMO

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                                      -28-

<PAGE>   29
            shall consider in good faith all reasonable suggestions of BAXTER.
            SANGAMO shall provide BAXTER a written update of the status of the
            Patent Rights and such Inventions Patents, in the same form as the
            Schedules hereto on at least an annual basis. If SANGAMO chooses not
            to file, prosecute or maintain any patent applications within the
            Patent Rights or Inventions Patents, then SANGAMO shall notify
            BAXTER prior to taking any action which would jeopardize such patent
            rights. BAXTER will then have the right (i) to file, prosecute or
            maintain any patent applications within the Inventions Patents that
            claim solely Joint Inventions at its own expense, and (ii) to pay
            SANGAMO's reasonable expenses for SANGAMO's continued filing,
            prosecution or maintenance of such Patent Rights or other Inventions
            Patents (if SANGAMO determines in good faith that such continued
            filing, prosecution or maintenance is strategically desirable for
            the Licensed Products and is consistent with its patent prosecution
            practices).

      (b)   BAXTER shall be responsible, at its sole cost, for filing and
            prosecuting to issuance patent applications, for filing and
            prosecuting all patent re-issues and re-examinations, for applying
            for and obtaining any patent term extensions, and for paying all
            maintenance fees on all patents, relating to the Inventions Patents
            that claim BAXTER Inventions.

7.    OBLIGATIONS OF THE PARTIES

7.1   DILIGENCE OBLIGATIONS

      (a)   SANGAMO shall use commercially reasonable efforts consistent with
            international practice in the biotechnology industry, SANGAMO's
            sound business judgment, and research, regulatory and market
            conditions, to perform its obligations under this Agreement,
            including, but not limited to, its obligations under Clause 5.1.

      (b)   BAXTER and/or its sub-licensees shall use commercially reasonable
            efforts consistent with international practice in the human-use
            pharmaceutical industry, BAXTER's sound business judgment, and
            clinical, regulatory and market


                                      -29-
<PAGE>   30

                conditions, to develop and commercialize Licensed Products in
                the Territory for use in the Field.

        (c)     Notwithstanding the foregoing, BAXTER shall be deemed to have
                satisfied its diligence obligations under this Clause 7.1 upon
                timely payment of the license fees under Clauses 4.2.1(b) and
                (c).

7.2     STEERING COMMITTEE

        7.2.1   SANGAMO and BAXTER will appoint a Steering Committee comprising
                up to three (3) named representatives from each party and up to
                four (4) ex-officio members from each party as required to meet
                at least four (4) times per year or with less frequency if
                mutually agreed by the Steering Committee at mutually agreed
                locations. SANGAMO and BAXTER shall have the right to approve
                the other Party's nominated Steering Committee members, which
                approval shall not be unreasonably withheld, with the sole
                objective of avoiding the appearance of conflict among
                nominated representatives. Where matters of conflict of interest
                arise subsequent to a member joining the Steering Committee, the
                Steering Committee shall have the right to remove such member
                and the Party who such member represents will nominate a
                replacement.

        7.2.2   The Steering Committee shall design, manage, review and direct
                the status and operation of the scientific and technical
                activities and obligations to be performed under this Agreement
                and the Research Funding Agreement, including, but not limited
                to, (i) the selection of the appropriate ZFP molecule to be
                pursued for pre-clinical testing, and (ii) reviewing and
                approving entry into each phase of clinical development. The
                Steering Committee may be further called upon to assist in
                establishing or revising the workplans associated with and/or
                the requirements for the preclinical testing needed for the IND
                submission or the manufacturing process development to be
                performed under this Agreement and the Research Funding
                Agreement. The Steering Committee shall also provide a forum for
                the parties to disclose any additional research data relating to
                improvements,


                                     - 30 -
<PAGE>   31

                modifications, enhancements or variations to the ZFP arising
                under this Agreement or the Research Funding Agreement.

        7.2.3   Decisions, recommendations, or approval of the Steering
                Committee shall require an affirmative vote of two-thirds of the
                seated members (i.e., four of six). Meetings or convenings of
                the Steering Committee shall require the participation or
                attendance of at least five (5) members of the Steering
                Committee.

        7.2.4   Each party will be responsible for the costs of their
                representative's attendance, unless otherwise agreed. The
                Steering Committee shall appoint a secretary who shall keep
                written records of its meetings.

        7.2.5   At any time after the date of First Commercial Sale of a
                Licensed Product, the Steering Committee may disband by mutual
                agreement.

7.3     APPOINTMENT OF PROJECT MANAGER

        In addition to the appointment of the Steering Committee above, SANGAMO
        and BAXTER shall each appoint a designated project manager who will be
        responsible for keeping the other party informed of activities under
        this Agreement.

8.      CONFIDENTIALITY

8.1     OBLIGATIONS

        This Clause 8 applies, except as otherwise provided in this Clause 8,
        during the term of this Agreement, and thereafter for a period of five
        (5) years. Both SANGAMO and BAXTER shall maintain in confidence, not
        disclose to any Third Party and use only for the purposes of this
        Agreement information and data which is not generally known and which
        (a) results from the use or development of the Technology and Inventions
        pursuant to this Agreement or the Research Funding Agreement, or (b) is
        supplied by SANGAMO or BAXTER after April 13, 1999 in connection with
        this Agreement or the Research Funding Agreement (or discussions leading
        up to them) and is marked, identified or otherwise acknowledged to be
        confidential (INFORMATION).

                                     - 31 -


<PAGE>   32


8.2    PERMITTED DISCLOSURES

       To the extent it is reasonably necessary to fulfill their obligations or
       exercise their rights pursuant to this Agreement, BAXTER and SANGAMO may
       disclose Information they are otherwise obligated pursuant to this Clause
       8 not to disclose, to its Affiliates, its bona fide proposed sublicensees
       and its permitted sublicensees, and shall limit disclosure of such
       Information to its and their respective officers, directors, employees
       and consultants on a need-to-know basis, in each case provided that such
       persons and entities agree to keep the Information confidential for the
       same time periods and to the same extent as the disclosing party is
       required to keep the Information confidential. BAXTER and SANGAMO may
       also disclose such information to government or other regulatory
       authorities to the extent that such disclosure is required to be
       disclosed to obtain a patent or authorization to conduct a clinical
       trial or to commercially market any product arising out of the Technology
       or is otherwise required by applicable law, regulation or court order, in
       each case provided that the disclosing party shall provide written notice
       to the other party and sufficient opportunity to object to such
       disclosure or to request confidential treatment thereof. The obligation
       not to disclose Information shall not apply to any part of such
       Information that:

       (a)  is or becomes patented, published or otherwise part of the public
            domain other than by acts of the person obligated not to disclose
            such Information in contravention of this Agreement;

       (b)  is disclosed to the receiving party by a Third Party, provided such
            Information was not obtained from such Third Party directly or
            indirectly from SANGAMO or BAXTER (as the case may be);

       (c)  prior to disclosure pursuant to this Agreement, was already in the
            possession of the receiving party, provided such Information was not
            obtained directly or indirectly from SANGAMO or BAXTER (as the case
            may be);



                                      -32-
<PAGE>   33



       (d)  is developed independently of the Information obtained from SANGAMO
            or BAXTER (as the case may be), by persons without access to or use
            of the Information, as demonstrated by written evidence; or

       (e)  is disclosed by either SANGAMO or BAXTER with the prior written
            consent of the other.

8.3    TERMS OF THIS AGREEMENT

       SANGAMO and BAXTER agree to not disclose the existence of or the
       financial terms or conditions of this Agreement or the Research Funding
       Agreement to any Third Party without the prior written consent of the
       other, except as required by applicable law or regulatory authority.

8.4    PUBLIC ANNOUNCEMENTS

       Notwithstanding the provisions of Clause 8, neither BAXTER nor SANGAMO
       shall release any media release or other oral or written announcement for
       dissemination to the media concerning or arising from this Agreement or
       the Research Funding Agreement without the written consent of the other
       party.

8.5    SURVIVAL OF OBLIGATIONS

       This Clause 8 survives the termination of this Agreement.

9.     LIMITATION OF LIABILITY AND INDEMNITY

9.1    BAXTER agrees to indemnify, hold harmless and defend SANGAMO, its
       directors, trustees, officers, employees and agents, and the inventors of
       the patent and patent applications included in the Patent Rights or in
       SANGAMO Inventions or Joint Inventions against any and all losses,
       liabilities, damages and expenses (including reasonable attorneys' fees
       and costs) incurred as a result of any Third Party claims, suits,
       demands, causes of action or other proceedings to the extent arising out
       of BAXTER's and its sublicensees' use of the Patent Rights, Technology,
       Inventions Patents or Inventions or the manufacture, use, offer for sale
       or sale of Licensed Products (without



                                      -33-
<PAGE>   34
      regard to culpable conduct), except to the extent arising from the
      negligence or willful misconduct of SANGAMO, or its directors, officers,
      employees, and agents, or the failure of SANGAMO (as the case may be) to
      disclose relevant information pursuant to Section 2.1, 2.2 or 5.1(c) of
      this Agreement.

9.2   SANGAMO agrees to indemnify, hold harmless and defend BAXTER, its
      directors, trustees, officers, employees and agents, against any and all
      losses, liabilities, damages and expenses (including reasonable
      attorneys' fees and costs) incurred as a result of any Third Party
      claims, suits, demands, causes of action or other proceedings to the
      extent arising out of the negligence or willful misconduct of SANGAMO, or
      its directors, officers, employees and agents, or the failure of SANGAMO
      to disclose relevant information pursuant to Section 2.1, 2.2 or 5.1(c)
      of this Agreement.

9.3   This Clause 9 survives the termination of this Agreement.

10.   INSURANCE

      (a)   BAXTER shall maintain insurance, including product liability
      insurance, with respect to the use and exploitation of the Patent Rights,
      Technology, Inventions Patents and Inventions, and the research,
      development, production, distribution and use of Licensed Products in
      such amount as is customarily maintained in accordance with good practice
      for the pharmaceutical industry. BAXTER shall maintain such insurance for
      so long as it continues to use and exploit any of the Patent Rights,
      Technology, Inventions Patents or Inventions, or to conduct the research,
      development, production, distribution or use of Licensed Products, and
      thereafter for so long as BAXTER maintains insurance for itself covering
      supply of Licensed Products. The liability insurance requirement of this
      Section may be satisfied through self-insurance with reserves consistent
      with industry practices.

      (b)   BAXTER shall, upon the request of SANGAMO:

            (i)   produce evidence of the currency of such insurance; and

            (ii)  note the interest of SANGAMO on the policy in respect of such
                  insurance.



                                      -34-
<PAGE>   35
11.   TERM AND TERMINATION

11.1  TERM

      Unless terminated earlier pursuant to Clause 11.2, this Agreement shall
      continue in force in each country of the Territory until the date of
      expiration of the last to expire of any patent within the Patent Rights
      or the Invention Patents in such country, at which time BAXTER will have
      a fully paid up license, including the right to sublicense, to the ZFPs,
      Inventions and the Technology as provided herein.

11.2  EARLY TERMINATION

      (a)   In addition to any rights it may have hereunder, a party may
            terminate this Agreement upon (30) days prior written notice
            following the occurrence of any of the following:

            (1)   the bankruptcy, insolvency, dissolution or winding up of the
                  other party (other than dissolution or winding up for the
                  purposes of a solvent reconstruction or amalgamation);

            (2)   the failure of the other party to cure the breach of any
                  provision of this Agreement for the payment of funds within
                  thirty (30) days after written notice thereof by the
                  non-breaching party; or

            (3)   the failure of the other party to cure the breach of any
                  material provision of this Agreement, except nonpayment of
                  funds, within sixty (60) days after written notice thereof by
                  the non-breaching party.

      (b)   BAXTER has the right to terminate this Agreement at any time by
            giving ninety (90) days prior written notice without cause.

      (c)   Upon early termination of this Agreement for any of the reasons set
            forth in this Clause 11.2(a) and (b), BAXTER shall have no
            obligation to make any license fee payments that come due after the
            effective date of termination.



                                      -35-
<PAGE>   36
11.3  SURVIVAL

      (a)   Expiration or termination of this Agreement shall not relieve the
            parties of any obligation accruing prior to such expiration or
            termination.

      (b)   The provisions of Clause 3.1(d) shall survive the expiration or
            termination of this Agreement.

      (c)   Upon expiration or termination of this Agreement, SANGAMO shall
            assign to BAXTER all right, title and interest in the BAXTER
            Inventions and all patent rights and other intellectual property
            rights therein.

12.   RESOLUTION OF DISPUTES

12.1  DISPUTES COMMITTEE

      Disputes arising between the Parties to this Agreement shall be referred
      to a disputes committee which shall consist of the respective chief
      executive of SANGAMO and the highest official of the CardioVascular Group
      of BAXTER or their delegates (DISPUTES COMMITTEE). The Disputes Committee
      shall confer together in an endeavor to settle the dispute on some fair
      and equitable commercial basis with regard to the basic legal rights of
      SANGAMO and BAXTER. Any discussions or proceedings of the Disputes
      Committee shall be on a without prejudice basis.

12.2  USE OF EXPERT

      Subject to agreement of all members of the Disputes Committee, the
      Disputes Committee may, at its option, refer any dispute or difference to
      an independent Third Party, who shall act as an expert and not as an
      arbitrator in settling the same, on terms that the decision of such
      independent Third Party shall be binding on SANGAMO and BAXTER.

12.3  OTHER RIGHTS AND REMEDIES

      If the parties are unable to resolve a dispute under this Clause 12 within
      thirty (30) days after written notice from one party to the other of such
      dispute, either party shall have the


                                      -36-
<PAGE>   37
      right to pursue all rights and remedies to which it is entitled at law, in
      equity or otherwise. Nothing in this Agreement shall preclude either party
      from seeking appropriate injunctive relief in any court of competent
      jurisdiction, whether or not the applicable dispute has been submitted to
      resolution under this Clause 12.

13.   NOTICES

      Any notice, demand, consent or other communication (NOTICE) given or made
      under this Agreement:

      (a)   must be in writing and signed by a person duly authorized by the
            sender;

      (b)   must either be delivered to the intended recipient as follows:

            (i)   to SANGAMO
                  BIOSCIENCES, INC.:      Point Richmond Tech Center
                                          501 Canal Blvd., Suite A100
                                          Richmond, California 94840
                                          Attention: President
                                          Fax No: (510) 236-8951

            (ii)  to Baxter Healthcare
                  Corporation:            17221 Red Hill Avenue
                                          Irvine, California, 92614-5686
                                          Attention: Group Vice President,
                                          CardioVascular Group
                                          Fax No: (949) 250-6850

      (c)   will be effective upon receipt by the intended recipient.

14.   ENTIRE AGREEMENT

      This Agreement and the Research Funding Agreement contain the entire
      agreement between the parties with respect to its subject matter and
      supersede all prior agreements and understandings between the parties in
      connection with them.

15.   AMENDMENT

      No amendment or variation of this Agreement is valid or binding on a party
      unless made in writing executed by all parties.


                                      -37-
<PAGE>   38
16.  ASSIGNMENT

16.1 NO ASSIGNMENT WITHOUT CONSENT

     Except as provided in clause 16.2, neither BAXTER nor SANGAMO may assign
or otherwise transfer this Agreement or any of its rights or obligations herein
without the prior written consent of the other party, which consent shall not
be unreasonably withheld.

16.2 PERMITTED ASSIGNMENTS

     (a)  Either party may assign this Agreement together with the Research
          Funding Agreement, the Convertible Debenture Purchase Agreement and
          the Convertible Debenture, without the prior written consent of the
          other party in connection with the sale or transfer of all or
          substantially all of its stock or assets to which this Agreement
          relates, by merger, divestiture, spin-off or similar transaction,
          provided that such assignee undertakes in writing to be bound by all
          the terms and conditions in this Agreement and the other party is
          notified within thirty (30) days of such assignment taking place; and

     (b)  SANGAMO or BAXTER may assign this Agreement together with the
          Research Funding Agreement, the Convertible Debenture Purchase
          Agreement and the Convertible Debenture, to an Affiliate provided that
          such Affiliate undertakes to be bound by the terms and conditions of
          this Agreement.

17.  NO WAIVER

     No failure to exercise nor any delay in exercising any right, power or
     remedy by a party operates as a continuing waiver. A single or partial
     exercise of any right, power or remedy does not preclude any other or
     further exercise of that or any other right, power or remedy. A waiver is
     not valid or binding on the party granting that waiver unless made in
     writing.


                                      -38-


<PAGE>   39
18.  FURTHER ASSURANCES

     Each party agrees to do all things and execute all deeds, instruments,
transfers or other documents as may be necessary or desirable to give full
effect to the provisions of this Agreement and the transactions contemplated by
it.

19.  RELATIONSHIP OF THE PARTIES

     This Agreement does not constitute an employer/employee relationship,
partnership of any kind, an association or trust between the parties, each
party being individually responsible only for its obligations as set out in
this Agreement and in addition the parties agree that their relationship is one
of independent contractors. BAXTER is not authorized or empowered to act as
agent on behalf of SANGAMO and BAXTER shall not on behalf of SANGAMO enter into
any contract, warranty or representation as to any matter. SANGAMO shall not be
bound by the acts or conduct of BAXTER. SANGAMO is not authorized or empowered
to act as agent on behalf of BAXTER and SANGAMO shall not enter any contract,
warranty or representations as to any matter on behalf of BAXTER. BAXTER shall
not be bound by the acts or conduct of SANGAMO.

20.  GOVERNING LAW AND JURISDICTION

     This Agreement is governed by the laws of the State of California, USA.

21.  COUNTERPARTS

     This Agreement may be executed in any number of counterparts. All
counterparts together will be taken to constitute one instrument.

22.  INSOLVENCY

     (a)  All rights and licenses granted under or pursuant to this Agreement
by SANGAMO to BAXTER are, for all purposes of Section 365(n) of Title 11 of the
United Sates Code (together with its foreign equivalents, the "Insolvency
Statute"), licenses of rights to "intellectual property" as defined in the
Insolvency Statute. If an Insolvency Statute case is commenced by or against
SANGAMO,



                                      -39-

<PAGE>   40
     and this Agreement is rejected by SANGAMO (in any capacity, including
     debtor-in-possession, its successors, assigns, or an Insolvency Statute
     trustee), then notwithstanding such rejection BAXTER shall retain all of
     its rights, benefits, licenses, protections and privileges under this
     Agreement and shall be entitled to all of the rights, benefits and
     protections of a licensee under the Insolvency Statute. BAXTER will have
     the right and ability to cure any and all defaults by SANGAMO under this
     Agreement and to take any other actions to oppose a rejection pursuant to
     the Insolvency Statute of this Agreement, and to contract directly with
     third parties, if any, involved in contracted arrangements with SANGAMO
     with respect to performance of this Agreement. SANGAMO shall, upon written
     request of BAXTER, provide BAXTER with complete access to all Patent
     Rights, Technology, Inventions Patents and Inventions solely to the extent
     necessary for BAXTER to perform SANGAMO's obligations under this Agreement;
     provided, however, that such rights of access shall only be exercisable if
     SANGAMO fails to perform its obligations under this Agreement substantially
     as contemplated herein. All rights, powers and remedies of BAXTER provided
     herein are in addition to and not in substitution for any and all other
     rights, powers and remedies now or hereafter existing at law or in equity
     (including, without limitation, the Insolvency Statute) in the event of the
     commencement of an Insolvency Statute case by or against SANGAMO, and
     BAXTER shall be entitled to exercise all other such rights and powers and
     resort to all other such remedies as may now or hereafter exist at law or
     in equity in such event.

(b)  In the event of a rejection in bankruptcy of this Agreement by SANGAMO
     pursuant to the Insolvency Statute, then, in place of SANGAMO, Baxter shall
     itself have the right to design, assemble and characterize (or cause to be
     designed, assembled or characterized) one or more zinc finger DNA binding
     proteins for the activation of VEGF or VEGF receptors for the treatment or
     prevention of ischemic cardiovascular and vascular disease in humans, in
     addition to those developed under the Sponsored Research, and any zinc
     finger DNA binding protein and/or the nucleic acid that encodes therefor;
     provided, however, that the

                                      -40-
<PAGE>   41
          subsequent making, using, offering for sale, selling or importing of
          such zinc finger DNA binding proteins shall be limited to the scope of
          the licenses granted hereunder. If this Agreement is rejected by
          SANGAMO in bankruptcy then, upon the written request of BAXTER, and as
          required by the Insolvency Statute, SANGAMO shall promptly deliver to
          BAXTER any intellectual property and/or know-how or any other
          information which is in the control of SANGAMO and which BAXTER
          reasonably needs or requires to allow BAXTER itself to design,
          assemble and characterize (or cause to be designed, assembled or
          characterized) zinc finger DNA binding proteins and/or the nucleic
          acid that encodes therefor; provided, however, that the subsequent
          making, using, offering for sale, selling or importing of such zinc
          finger DNA binding proteins shall be limited to the scope of the
          licenses granted hereunder. BAXTER shall be relieved from any payment
          obligation to SANGAMO under Paragraph 3.3 above for zinc finger DNA
          binding proteins which BAXTER designs, assembles or characterizes (or
          causes to be designed, assembled or characterized) after the rejection
          of this Agreement by SANGAMO.

23.  FORCE MAJEURE

     In the event of any delay in performance by either party of any of its
     obligations or liabilities pursuant to this Agreement to the extent due to
     any cause arising from or attributable to acts, events, non-happenings,
     omissions, accidents or acts of God beyond the reasonable control of the
     party to perform (including but not limited to strikes, lock-outs, shortage
     of labor, civil commotion, riot, war, threat of or preparation for war,
     breaking off of diplomatic relations, fire, explosion, sabotage, storm,
     flood, earthquake, fog, subsidence, pestilence, epidemics, computer system
     or machinery breakdown, failure of plant, collapse of structures, voluntary
     or mandatory compliance with any direction, request or order of any person
     having or appearing to have authority whether for defense or other
     governmental or national purposes, or any requisition for materials or
     services apparently or stated to be used for the purposes of defense,
     inability to obtain suitable raw material, equipment, fuel, power,
     components or transportation), the party so delayed or prevented will be
     under no liability for loss or injury suffered by the other party and any

                                      -41-
<PAGE>   42
   such delay or failure to perform will not constitute a breach of this
   agreement to the extent due to such cause, provided that the party so delayed
   uses commercially reasonable efforts to remedy the effect of such cause.

   EXECUTED as an agreement.

SIGNED by /s/ EDWARD LANPHIER          )
                                       )
a duly authorized officer of SANGAMO   )
BIOSCIENCES, INC. in the presence of:  )



Witness     /s/ PETER BLUFORD            PRESIDENT & CEO
            ---------------------------  --------------------------------------
                                         Duly Authorized Officer


Print Name  Peter Bluford                Edward Lanphier
            ---------------------------  --------------------------------------
            VP, Corporate Development    Print Name


SIGNED by                              )
                                       )
a duly authorized officer of BAXTER    )
HEALTHCARE CORPORATION in the presence )
of:

Witness     /s/ ANN M. SMALL             /s/ J. H. KEHL, JR.
            ---------------------------  --------------------------------------
                                         Duly Authorized Officer


Print Name  Ann M. Small                 J. H. Kehl, Jr.
            ---------------------------  --------------------------------------
                                         Print Name
                                         VP, Business Development
                                         CardioVascular Group


                                      -42-

<PAGE>   1


                                                                    Exhibit 10.8


                              SUBLICENSE AGREEMENT


AGREEMENT made effective this 9th day of May, 1996


BY AND BETWEEN:


JOHNSON & JOHNSON, a company organized under the laws of the State of New
Jersey, U.S.A., and having executive offices at One Johnson & Johnson Plaza, New
Brunswick, New Jersey 08933-5501 (hereinafter called "LICENSOR")


                                                                ON THE ONE HAND,


AND:


SANGAMO BIOSCIENCES, INCORPORATED, a company organized under Delaware law,
having an address at 950 Marina Village Parkway, Suite 100, Alameda, CA 94501
(hereinafter called "LICENSEE")


                                                              ON THE OTHER HAND,


WITNESSETH:


A.  WHEREAS, pursuant to     *     *     *     *     *     *     *     *     *
         *     *     *     *     *     *     *     *     *     *     *  between
    LICENSOR and     *     *     *     *     *     *     *     *      *     *
         *  granted LICENSOR an exclusive option to obtain an exclusive
    worldwide license (including the right to grant sublicenses) to certain
    technology, including certain technology in the field of Zinc Finger Protein
    Derivatives (hereinafter the "INVENTIONS"), and LICENSOR has exercised its
    option thereunder;


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   2


B.  WHEREAS, patent applications have been filed in the United States and other
    territories in the  name of      *  for the granting of letters patent
    relating to the said INVENTIONS, further described in Appendix 1 hereto; and

C.  WHEREAS, LICENSOR desires that the INVENTIONS be developed and made
    available to the public; and

D.  WHEREAS, LICENSEE represents that it is presently engaged, or intends to be
    engaged in the business of research, development, manufacturing and selling
    products in fields related to the INVENTIONS; and

E.  WHEREAS, LICENSEE wishes to make use of the INVENTIONS for the research,
    development, manufacturing and selling of products and wishes to obtain
    certain rights to the INVENTIONS under the terms and conditions hereinafter
    set forth;

F.  WHEREAS, LICENSOR is willing and able to grant such rights to LICENSEE;

NOW, THEREFORE, in consideration of the premises and the performance of the
covenants herein contained, IT IS AGREED AS FOLLOWS:

1.  DEFINITIONS

For the purposes of this agreement (hereinafter called the "SUBLICENSE
AGREEMENT"), and solely for such purposes, the terms hereinafter set forth shall
have the following respective meanings:

(a) "AFFILIATE" or "AFFILIATES" shall mean any corporation(s) or organization(s)
    which CONTROLS, is(are) directly or indirectly CONTROLLED by, or under
    common control with LICENSEE.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.




                                       2
<PAGE>   3
(b)  "CONTROL", "CONTROL(S)" or "CONTROLLED" shall refer to direct or indirect
     beneficial ownership of at least fifty percent (50%) of the voting stock
     of a corporation or other business entity, or a fifty percent (50%) or
     greater interest in the income of such corporation or other business
     entity, or the power to direct or cause the direction of the management or
     policies of such corporation or other business entity or policies of such
     corporation or other business entity whether by ownership of voting
     securities by contract or otherwise, or such other relationship as, in
     fact, constitutes actual control.

(c)  "EFFECTIVE DATE" shall mean the date at the head of this SUBLICENSE
     AGREEMENT.

(d)  "FDA" shall mean the United States Food and Drug Administration.

(e)  "FIELD" shall mean the diagnoses, therapy or preventive treatment of
     diseases in humans or animals.

(f)  "IND" shall mean an Investigational New Drug Application filed pursuant to
     the requirements of the FDA as more fully defined in 21 C.F.R. Section
     312.3 or its equivalent in any country of the European Economic Community.

(g)  "LICENSED PRODUCT" shall mean any product the manufacture, USE or SALE of
     which is covered by a VALID CLAIM of the PATENT RIGHTS or that is SOLD by
     LICENSEE or an AFFILIATE under conditions or circumstances which, if
     unlicensed, would amount to infringement or contributory infringement or
     inducement of infringement of the PATENT RIGHTS.

(h)  "NDA" shall mean a New Drug Application filed with the United States Food
     and Drug Administration under 21 USC 355(b)(FDCA Section 505(b)) or its
     equivalent filed with the Health Regulatory Authorities in other countries
     or jurisdictions.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       3
<PAGE>   4
(i)  "NET SALES VALUE" shall mean that sum determined by deducting from the
     gross amount billed and collected by the SELLER (LICENSEE, SUBLICENSEE or
     AFFILIATE) in an arms length transaction to customers that are not
     AFFILIATES of the SELLER;

     (i)   transportation charges or allowances, including freight pickup
           allowances, and packaging costs, if any;

     (ii)  trade, quantity or cash discounts, service allowances and independent
           broker's or agent's commissions, if any, allowed or paid;

     (iii) credits or allowances for the LICENSED PRODUCT, if any, given or made
           on account of price adjustments, returns, bad debts, off-invoice
           promotional discounts, rebates, chargebacks, any and all federal,
           state or local government rebates or discounts whether in existence
           now or enacted at any time during the term of this SUBLICENSE
           AGREEMENT, volume reimbursements, the gross amount billed and
           collected for rejected LICENSED PRODUCT or LICENSED PRODUCT subject
           to recall or destruction (voluntarily made or requested or made by an
           appropriate government agency, sub-division or department); and

     (iv)  any tax, excise or other governmental charge upon or measured by the
           production, sale, transportation, delivery or use of the LICENSED
           PRODUCT;

     in each case determined in accordance with generally accepted accounting
     practices.

(j)  "PATENT RIGHTS" shall mean the patents and patent applications identified
     in Appendix 1 hereof, and in respect of such letters patent, and patent
     applications, all corresponding national patents and patent applications,
     European Patent Convention applications or applications under similar
     administrative international conventions, patent applications in the
     listed or designated countries, together with any divisional,
     continuation, continuation-in-part, substitution, reissue, extension,
     supplementary protection certificate or other application based thereon.

(k)  "SELLER" shall mean one who SELLS.




                                        4
<PAGE>   5
(l)   "SOLD", "SALE", "SALES", "SELL", "SELLING", and "SELLS" shall refer to the
      act of selling or disposing of for value.

(m)   "SUBLICENSEE" shall mean a third party other than an AFFILIATE to whom
      LICENSEE has extended a further sublicense in accordance with Article 2(b)
      hereunder.

(n)   "USE", "USES" and "USED" shall refer to the act of using for any
      commercial purposes whatsoever.

(o)   "VALID CLAIM" shall mean a claim of an unexpired patent within the PATENT
      RIGHTS which has matured into an issued patent or a claim being prosecuted
      in a pending application within the PATENT RIGHTS. In each case a claim
      shall be presumed to be valid unless and until it has been held to be
      invalid by a final judgement of a court of competent jurisdiction from
      which no appeal can be or is taken. For the purposes of royalty
      determination and payment under Article 4 hereof, any claim being
      prosecuted in a pending patent application, including applications
      involved in interference or opposition proceedings, shall be deemed to be
      the equivalent of a valid claim of an issued, unexpired patent.


2.    LICENSE

(a)   LICENSOR hereby grants to LICENSEE, and LICENSEE hereby accepts from
      LICENSOR, upon the terms and conditions herein specified, a worldwide
      exclusive sublicense under the PATENT RIGHTS to make, to have made, to USE
      and to SELL LICENSED PRODUCTS in the FIELD.

(b)   LICENSEE acknowledges and agrees that the exclusive rights granted
      pursuant to this Agreement shall be subject to:

            (i)        *     rights pursuant to the      *     *      to use the
                  LICENSED PATENTS for educational and research purposes; and

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       5
<PAGE>   6
            (ii)  the rights of the United States Government pursuant to 35
                  U.S.C. 202 et seq. and 37 C.F.R. 401.1 et seq. which may have
                  arisen or resulted form federal funding of    *    research
                  relating to the LICENSED PATENTS, including the non-exclusive
                  right of the United States Government to practice the
                  inventions covered by the LICENSED PATENTS. Subject to the
                  foregoing, J&J intends to grant to LICENSEE the maximum rights
                  allowable under 35 U.S.C. Sec. 202 et seq. and 37 C.F.R. 401.1
                  et seq.

      (c)   Each party hereunder represents and warrants that it will make good
            faith efforts to comply in all respects with the applicable
            provisions of any applicable law, regulation, or requirement by any
            Government relating to the LICENSED PATENTS. Each party agrees that
            it will make good faith efforts to ensure that all necessary steps
            are taken to comply with the requirements of 35 U.S.C. 202 et seq.
            and 37 C.F.R. 401.1 et seq. to retain the maximum rights under the
            LICENSED PATENTS allowable by law. LICENSEE agrees that it will
            provide    *    with the necessary reports and information required
            for    *    to comply with 35 U.S.C. Sec. 202 et seq. and 37 C.F.R.
            401.1 et seq., including periodic reports on utilization or efforts
            at utilization of the inventions covered by the LICENSED PATENTS.

      (d)   The sublicenses granted hereunder shall include the right to grant
            further sub-licenses to AFFILIATES or third party SUBLICENSEES,
            provided that LICENSEE agrees to be responsible for the performance
            hereunder by its AFFILIATES and SUBLICENSEES to which the license
            and rights shall have been extended.

      (e)   For the purposes of reporting and making payments of earned
            royalties under this SUBLICENSE AGREEMENT, the manufacture, SALE or
            USE of LICENSED PRODUCTS by any AFFILIATE or SUBLICENSEE to which
            the license and rights shall have been extended shall be considered
            the manufacture, SALE or USE of such LICENSED PRODUCT by LICENSEE
            and any such AFFILIATE or SUBLICENSEE may make the pertinent reports
            and royalty payments specified in Article 4 hereof directly to
            LICENSOR



* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       6
<PAGE>   7
     on behalf of LICENSEE; otherwise, such reports and payments on account of
     SALES or USE  of LICENSED PRODUCTS by each AFFILIATE or SUBLICENSEE shall
     be made by LICENSEE; and, in any event, the SALES and USES of LICENSED
     PRODUCT by each such AFFILIATE or SUBLICENSEE shall be separately shown in
     the reports to LICENSOR if such information is readily available to
     LICENSEE.

(f)  The LICENSEE shall be responsible to the LICENSOR for the enforcement of
     the terms of the sub-license and for inspecting the accounts and records
     kept by the SUBLICENSEE. The LICENSEE shall at the request of the LICENSOR
     appoint a qualified person jointly with the LICENSOR to inspect the records
     of the SUBLICENSEE on behalf of both and both shall be entitled to a full
     report thereon.

(g)  No other, further or different license or right and, except as expressly
     provided in Article 2 hereof, is hereby granted or implied.

3.   LICENSE FEES

(a)  In consideration of the Licenses granted hereunder, LICENSEE shall pay to
     LICENSOR License Fees of      *     *     *     *     *   at times and
     amounts as follows:

          (i)       *     *     *     *     * within ten days of execution of
               this LICENSE AGREEMENT by both parties;

          (ii)      *     *     *     *     * per year for    *  years, due on
               each of the first   *   anniversary dates of the EFFECTIVE DATE.

     The obligation to pay the foregoing License Fees shall be a non-cancelable
     commitment by LICENSEE and such payments shall be due and payable at the
     times specified regardless of whether this LICENSE AGREEMENT is still in
     effect.

(b)  In addition, LICENSEE shall pay LICENSOR the following Milestone License
     Fees at times and amounts as follows as long as this LICENSE AGREEMENT is
     still in effect:



* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.


                                       7

<PAGE>   8
          (i)       *                                 upon      *
                    *    for a LICENSED PRODUCT, due thirty (30) calendar days
               after said event; and

          (ii)      *                                  upon      *
                    *    for a LICENSED PRODUCT, due thirty (30) calendar days
               after said event.

4.   ROYALTIES, RECORDS AND REPORTS

(a)  For the rights and privileges granted under this SUBLICENSE AGREEMENT,
     LICENSEE shall pay to LICENSOR earned royalties equal to      *
     of the NET SALES VALUE of LICENSED PRODUCT sold by LICENSEE, AFFILIATES or
     SUBLICENSEES.

(b)  Earned royalty shall be paid in the manner provided herein, to the end of
     the term or terms of the last to expire of the issued patents within the
     PATENT RIGHTS, or until this SUBLICENSE AGREEMENT is terminated as
     hereinafter provided. Earned royalty shall be paid in respect of pending
     patent applications within the PATENT RIGHTS during such time as the
     application is actively being prosecuted and has not been abandoned or
     finally rejected and appellate procedures are unsuccessfully exhausted or
     the time for perfecting any further appeals has expired.

(c)  Earned royalty shall be paid pursuant to Article 4(a) hereof on all
     LICENSED PRODUCTS SOLD under this SUBLICENSE AGREEMENT; however, earned
     royalty shall be payable hereunder as to a given LICENSED PRODUCT only when
     a license or an immunity granted under Article 2 hereof is utilized in the
     manufacture or SALE thereof, and the earned royalty payable on a given
     LICENSED PRODUCT made hereunder shall not become due and owing until such
     LICENSED PRODUCT is SOLD.

     Any LICENSED PRODUCT made under a license granted pursuant to this
     SUBLICENSE AGREEMENT prior to the termination or expiration of the
     applicable PATENT RIGHTS and not SOLD prior to the termination or
     expiration of such PATENT RIGHTS shall be


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.


                                       8
<PAGE>   9
            subject to the payment of royalties hereunder when SOLD, even though
            such SALE occurs after the termination or expiration of all
            pertinent licenses or rights granted hereunder.

            The earned royalty for any particular LICENSED PRODUCT shall be due
            upon the first bona fide arm's length SALE thereof by LICENSEE,
            AFFILIATE or SUBLICENSEE, and any subsequent SALE of such LICENSED
            PRODUCT by other than LICENSEE, AFFILIATE, or SUBLICENSEE shall be
            royalty free.

      (d)   Notwithstanding the provisions of Article 4(b) hereof, in the case
            of transfers or SALES of any LICENSED PRODUCT between LICENSEE and
            an AFFILIATE, between AFFILIATES, or between LICENSEE or AFFILIATE
            and SUBLICENSEES, one and only one royalty shall be payable thereon
            and such royalty shall become payable upon the final SALE thereof
            to a third party other than LICENSEE, AFFILIATE or SUBLICENSEE.

      (e)   LICENSEE shall keep full, true and accurate books of account
            containing all particulars which may be necessary for the purpose
            of showing the amount payable to LICENSOR by way of royalty as
            aforesaid or by way of any other provision hereunder. Said books of
            account shall be kept at LICENSEE's principal place of business.
            Said books and the supporting data shall be maintained and kept
            open at all reasonable times, for three (3) years following the end
            of the calendar year to which they pertain (and access shall not be
            denied thereafter, if reasonably available), to the inspection of
            an independent certified public accountant retained by LICENSOR and
            reasonably acceptable to LICENSEE for the purpose of verifying
            LICENSEE's royalty statements, or LICENSEE's compliance in other
            respects with this SUBLICENSE AGREEMENT. Names of customers and
            other confidential information shall not be disclosed to LICENSOR
            by such independent accountant. Such accountant shall be retained
            at LICENSOR's sole expense, unless during any such inspection a
            deficiency in payments to LICENSOR of one percent (1%) or more is
            determined to exist in which event LICENSEE shall within thirty
            (30) days reimburse LICENSOR for the full expense of retaining such
            accountant, including but not limited to professional and
            administrative fees, travel and subsistence costs.



                                       9

<PAGE>   10
     (f)   LICENSEE, within sixty (60) days after the first day of January,
           April, July and October of each year (the "Reporting Date"), shall
           deliver to LICENSOR a true and accurate report, giving such
           particulars of the LICENSED PRODUCTS SOLD by LICENSEE, AFFILIATES and
           SUBLICENSEES during the preceding three (3) months ("Accounting
           Period") under this SUBLICENSE AGREEMENT as are pertinent to an
           accounting for royalty under this SUBLICENSE AGREEMENT. These shall
           include at least the following, separately stated as to the LICENSED
           PRODUCTS:

           (i)    the quantity of LICENSED PRODUCTS invoiced by LICENSEE,
                  AFFILIATES and SUBLICENSEES during those three (3) months and
                  the billings therefor;

           (ii)   the allowable deductions therefrom;

           (iii)  the calculation of royalties thereon;

           Simultaneously with the delivery of each such report, LICENSEE shall
           pay to LICENSOR the royalty and any other payments due under this
           SUBLICENSE AGREEMENT for the period covered by such report. If no
           royalties are due, it shall be so reported. Royalties shall be paid
           to LICENSOR in United States Dollars at LICENSOR's office specified
           for the purposes of giving notice in Article 14(b) hereof.

     (g)   All amounts payable hereunder by LICENSEE to LICENSOR shall be
           payable in United States Dollars. In the event any LICENSED PRODUCT
           shall be SOLD by LICENSEE, SUBLICENSEE or an AFFILIATE for currency
           other than United States Dollars, the earned royalty payable as to
           such LICENSED PRODUCT under Article 4(a) hereof shall first be
           determined in the currency for which the LICENSED PRODUCT was SOLD
           and then converted into its equivalent in United States Dollars at
           the official rate of exchange of the currency of the country from
           which royalties are payable as quoted by the Wall Street Journal, New
           York Edition, for the last business day prior to the Reporting Date
           for which the royalty payment is made.

                                      -10-
<PAGE>   11
     (h)   In the event that any taxes, withholding or otherwise, are levied by
           any taking authority in connection with accrual or payment of any
           royalties payable to LICENSOR under this SUBLICENSE AGREEMENT,
           LICENSEE or its AFFILIATES and/or SUBLICENSEES shall have the right
           to pay such taxes to the local tax authorities on behalf of LICENSOR
           (or, in the case of SUBLICENSEE SALES, on behalf of LICENSEE), and
           the payment to LICENSOR of the net amount due after reduction by the
           amount of such taxes, together with evidence of payment of such
           taxes, shall fully satisfy LICENSEE's royalty obligations under this
           SUBLICENSE AGREEMENT. LICENSEE agrees to make a good faith effort to
           obtain a refund of any such taxes for LICENSOR if LICENSOR informs
           LICENSEE that it believes such taxes have been improperly levied.

     (i)   In the event that any payment required under this SUBLICENSE
           AGREEMENT shall be overdue, LICENSEE shall pay interest thereon at an
           annual rate of      *           over the United States Clearing Bank
           Base Lending Rate computed from the date when the payment became due;
           provided that if such rate shall be in excess of that allowed by
           applicable law, then the highest rate allowable shall apply. Payment
           shall be deemed to have been made when received by LICENSOR.

     5.    CONFIDENTIALITY

           Disclosures of confidential and proprietary information hereunder by
           either party to the other shall be made in writing (or promptly
           confirmed in writing if made in another form), and shall be clearly
           marked "Confidential". Such confidential information shall be
           safeguarded by the recipient, shall not be disclosed to third parties
           and shall be made available only to recipient's employees or
           independent contractors who agree in writing to equivalent conditions
           and who have a need to know the information for the purposes
           specified under this Agreement. All confidential information shall
           remain the property of and be returned to the disclosing party within
           thirty (30) days of receipt of a written request by the disclosing
           party, or within thirty (30) days of termination of this Agreement.
           These mutual obligations of confidentiality shall apply for a period
           of 3 (three) years after the termination of this Agreement, but such
           obligations shall not apply to any information that:


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.


                                       11

<PAGE>   12
(i)       is or hereafter becomes generally available to the public other than
          by reason of any default with respect to a confidentiality obligation
          under this Agreement; or

(ii)      was already known to the recipient as evidenced by prior written
          documents in its possession; or

(iii)     is disclosed to the recipient by a third party who is not in default
          of any confidentiality obligation to the disclosing party hereunder;
          or

(iv)      is developed by or on behalf of the receiving party, without reliance
          on confidential information received hereunder; or

(v)       is provided to third parties under appropriate terms and conditions
          including confidentiality provisions equivalent to those in this
          Agreement for consulting, manufacturing development, manufacturing,
          external testing and marketing trials with respect to the products
          covered by this Agreement; or

(vi)      is used with the consent of the disclosing party (which consent shall
          not be reasonably withheld) in applications for patents or copyrights
          under the terms of this Agreement; or

(vii)     has been approved in writing for publication by each of the parties;
          or

(viii)    is required to be disclosed in compliance with applicable laws or
          regulations in connection with the manufacture or sale of products
          covered by this Agreement; or

(ix)      is otherwise required to be disclosed in compliance with applicable
          laws or regulations or order by a court or other regulatory body
          having competent jurisdiction; or

                                       12
<PAGE>   13


(x) is product-related information which is reasonably required to be disclosed
    in connection with marketing of products covered by this Agreement.

6.  DEVELOPMENT and COMMERCIALIZATION

(a) LICENSEE agrees to diligently attempt to exploit the LICENSED PATENTS and
    will diligently exert efforts to create a demand for the LICENSED PRODUCTS
    in at least those countries where PATENT RIGHTS exist. Within sixty (60)
    days after the end of each semi-annual period (June 30 and December 31)
    prior to first commercial sale of LICENSED PRODUCT, LICENSEE shall submit a
    summary report to LICENSOR reporting the progress it, or its SUBLICENSEES,
    have made towards commercialization in the preceding semi-annual period.
    This report will include a summary of the work done in the development of
    LICENSED PRODUCTS. Non-performance of this Article 7 shall be a breach or
    default under this SUBLICENSE AGREEMENT, entitling the LICENSOR, in addition
    to other remedies LICENSOR may have, to terminate this SUBLICENSE AGREEMENT
    under Article 7(c) hereunder.

(b) Promptly following Health Regulatory Approval to market LICENSED PRODUCTS in
    such countries where approval is sought, LICENSEE agrees to use diligent
    efforts to promote and sell LICENSED PRODUCTS at a level which is consistent
    with those marketing efforts normally used for similar products in the
    pharmaceutical industry.

7.  TERMINATION

(a) LICENSEE may terminate this LICENSE AGREEMENT at any time upon sixty (60)
    days written notice to LICENSOR, but such termination shall not relieve
    LICENSEE of its obligation to pay the license fees due under Article 3(a)
    hereunder.

                                       13

<PAGE>   14


(b) If LICENSEE shall become bankrupt or insolvent and/or if the business of
    LICENSEE shall be place in the hands of a Receiver, Assignee, or Trustee,
    whether by the voluntary act of LICENSEE or otherwise, this SUBLICENSE
    AGREEMENT shall immediately terminate.

(c) Upon any breach of or default under this SUBLICENSE AGREEMENT by LICENSEE,
    LICENSOR may terminate this SUBLICENSE AGREEMENT by forty-five (45) days
    written notice to LICENSEE. Said notice shall become effective at the end of
    said period, unless during said period LICENSEE shall cure such breach or
    default.

(d) Upon termination of this SUBLICENSE AGREEMENT for any reason, other then by
    expiry of the PATENT RIGHTS, all rights granted hereunder shall revert to
    LICENSOR for the benefit of LICENSOR.

(e) LICENSEE's obligations to report to LICENSOR and to pay royalties to
    LICENSOR as to any LICENSED PRODUCT made or USED under a license or an
    immunity granted pursuant to this SUBLICENSE AGREEMENT prior to termination
    or expiration of this SUBLICENSE AGREEMENT shall survive such termination or
    expiration and any termination of this SUBLICENSE AGREEMENT shall be subject
    to this Article 7(d).

(f) Upon any termination of this SUBLICENSE AGREEMENT its provisions shall
    continue in force and effect to the extent necessary to effectuate any
    provision which by its terms clearly shall continue beyond such termination.

(g) Upon termination of this SUBLICENSE AGREEMENT other than by expiry of the
    PATENT RIGHTS, LICENSEE shall have no right under the PATENT RIGHTS to
    make, have made, USE or SELL LICENSED PRODUCTS.




                                       14
<PAGE>   15
8.   ASSIGNMENT

     This Agreement or any interest herein shall not be assigned or transferred,
     in whole of in part, by either party hereto without the prior written
     consent of the other party hereto. However, without securing such prior
     written consent, either party may assign this Agreement to an AFFILIATE or
     a successor of all or substantially all of its business to which this
     Agreement relates (except a successor under a reorganization pursuant to 11
     U.S.C. Sec. 365) provided, that no such assignment shall be binding and
     valid until and unless the assignee shall have assumed in a writing,
     delivered to the non-assigning party, all of the duties and obligations of
     the assignor, and, provided, further, that the assignor shall remain liable
     and responsible to the non-assigning party hereto for the performance and
     observance of all such duties and obligations.

9.   INFRINGEMENT

(a)  LICENSOR agrees to enforce its patents within the PATENT RIGHTS from
     infringement and sue infringers when in its sole judgement such action may
     be reasonably necessary, proper and justified.

(b)  Notwithstanding the provisions of Article 9(a) above, provided LICENSEE
     shall have supplied LICENSOR with evidence comprising a prima facie case of
     infringement of the PATENT RIGHTS by a third party hereto SELLING
     significant quantities of products in competition with LICENSEE's, an
     AFFILIATE's, or SUBLICENSEE's SALE of LICENSED PRODUCTS hereunder, LICENSEE
     shall be entitled to notify LICENSOR in writing requesting LICENSOR to take
     steps to enforce the PATENT RIGHTS and LICENSOR shall within three (3)
     months of the receipt of such written request either:

     (i)  cause said infringement to terminate (including termination for
          whatever cause); or



                                       15
<PAGE>   16
     (ii)  initiate legal proceedings against the infringer; or

     (iii) grant LICENSEE the right, at LICENSEE's sole expense, to bring suit
           against the infringer for infringement of the PATENT RIGHTS.

(c)  In no event shall LICENSEE be entitled to invoke Article 9(b) above with
     respect to more than one alleged infringer in any one country listed with
     the PATENT RIGHTS at any given time even though there be more than one such
     infringer in such country and the provisions of Article 9(b) hereof shall
     not come into effect or continue in effect as to such country while
     LICENSOR is carrying on any such legal proceeding therein.


(d)  In the event either party hereto shall initiate or carry on legal
     proceedings to enforce the PATENT RIGHTS against an alleged infringer, as
     provided herein, the other party hereto shall fully co-operate with the
     party initiating or carrying on such proceedings.

(e)  In the event LICENSOR shall institute suit or other legal proceedings to
     enforce the PATENT RIGHTS, it shall have sole control of such suit.

(f)  In the event LICENSEE shall institute suite or other legal proceedings
     under Article 9(b) above to enforce the PATENT RIGHTS, LICENSOR shall be
     entitled to be represented by counsel of its choosing, at its sole expense,
     and LICENSEE shall be entitled to retain for it as damages, an amount
     corresponding to its actual out-of-pocket legal expenses paid to third
     parties for conducting such suit or other legal proceedings and shall pay
     to LICENSOR TWENTY-FIVE PERCENT (25%) of the balance of such recovery.
     LICENSEE shall not discontinue or settle any such proceedings brought by it
     without obtaining the concurrence of LICENSOR and giving LICENSOR a timely
     opportunity to continue such proceedings in its own name, under its sole
     control, and at its sole expense. In the event LICENSOR does not concur in
     such settlement, it must continue such proceeding in its own name, under
     its sole control and expense




                                       16

<PAGE>   17


     within three (3) months of being given notice by LICENSEE of its desire to
     settle or LICENSEE shall be entitled to settle without LICENSOR's
     concurrence.

10.  STATUS OF THE PATENT RIGHTS

(a)  Pursuant to the      *     *     *     * agreed, with the advice of
     LICENSOR, to diligently prepare, file and prosecute the patent applications
     filed within the PATENT RIGHTS and LICENSOR agreed to reimburse      *  for
     the reasonable expenses associated therewith. Upon execution of this
     SUBLICENSE AGREEMENT, LICENSEE agrees to assume LICENSOR's obligation to
     reimburse    *     for patent expenses under the    *     *     for
     patent expenses incurred after the EFFECTIVE DATE. LICENSOR shall instruct
          *   to forward invoices for such patent expenses directly to LICENSEE
     and LICENSEE agrees to promptly pay such expenses. LICENSOR agrees to
     assure that    *   performs its obligations to maintain and prosecute the
     PATENT RIGHTS under the     *     *     and LICENSOR agrees to enforce
     its rights vis-a-vis   *   in this regard on LICENSEE's behalf if
     necessary. LICENSOR does not however represent or warrant that any patent
     within the PATENT RIGHTS will be obtained or that any such patent so
     obtained will be valid and enforceable.

(b)  LICENSEE shall also be responsible for expenses associated with maintaining
     the patents obtained on the patent applications referred to in Article
     10(a) hereof.

(c)  Upon request by LICENSEE, LICENSOR will advise, or ensure that    *
     advises, LICENSEE of the status of all patent applications and patents
     within the PATENT RIGHTS.

(d)  Should LICENSEE elect not to continue paying the expenses for the
     maintenance or prosecution of any patent or patent application under the
     PATENT RIGHTS, it shall give LICENSOR thirty (30) days written notice
     thereof and LICENSOR may thereafter

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       17

<PAGE>   18
     assume payment of such expenses at its own cost. In the event LICENSEE
     ceases to pay the expenses of prosecution of maintenance of any particular
     patent application or patent, then LICENSEE shall cease to have license
     rights with respect to such patent application or patent and LICENSOR
     shall be free to license such rights to a third party.

11.  NON-USE OF NAMES

(a)  LICENSEE shall not use the name of any inventor of the PATENT RIGHTS, or
     of any institution with which he has been or is connected, or of LICENSOR,
     or any adaptation of any of them, in any advertising, promotional or sales
     literature, without prior written consent obtained from LICENSOR in each
     case. LICENSEE shall require its AFFILIATES to comply with this Article 11
     to the same extent that it applies to LICENSEE.

(b)  LICENSOR shall not use the name of LICENSEE or its AFFILIATES or any
     adaptation thereof, in any advertising, promotional or sales literature or
     in any press release without prior written consent of LICENSEE in each
     case.

12.  WARRANTIES AND REPRESENTATIONS

(a)  LICENSOR warrants that it has exclusive rights by agreement, assignment or
     license to the PATENT RIGHTS, except with respect to the United States
     Government, and that it has full power and authority to execute, deliver
     and perform this SUBLICENSE AGREEMENT and the obligations hereunder.

(b)  Each party hereby warrants that the execution, delivery and performance of
     this SUBLICENSE AGREEMENT has been duly approved and authorized by all
     necessary corporate actions of both parties; do not require any
     shareholder approval which has not been obtained or the approval and
     consent of any trustee or the holders of any

                                       18
<PAGE>   19
     indebtedness of either party; do not contravene any law, regulation, rules
     or order binding on either Party, and do not contravene the provisions of
     or constitute a default under any indenture, mortgage contract or other
     agreement or instrument to which either party is a signatory.

(c)  Nothing in this SUBLICENSE AGREEMENT shall be construed as a
     representation or a warranty by LICENSOR as to the validity or scope of
     any patent within the PATENT RIGHTS or that any process practiced or
     anything made, USED or SOLD under any license or immunity granted under
     this SUBLICENSE AGREEMENT is or will be free from infringement of patents
     of third parties.


13.  INDEMNITY

     LICENSEE agrees to indemnify and hold harmless INVENTORS,    *    ,
     LICENSOR, its AFFILIATES and their respective officers, directors,
     employees and agents from and against any and all claims, damages and
     liabilities, including reasonable attorney's fees and expenses, asserted
     by third parties, both government and private, arising from LICENSEE's and
     AFFILIATES' manufacture, USE or SALE of LICENSED PRODUCTS or the USE
     thereof by others including ultimate consumers. LICENSEE hereby agrees to
     maintain in full force and effect general liability and product liability
     insurance with a commercial insurance carrier, which policy shall have
     individual and aggregate limits appropriate to the conduct of LICENSEE's
     business covering the sale and distribution of LICENSED PRODUCTS. LICENSOR
     shall be named as an additional insured in such insurance policy. LICENSEE
     shall provide a certificate of insurance to LICENSOR evidencing such
     insurance policy and providing that such insurance will not be cancelled,
     modified or subject to non-renewal without thirty (30) days' written
     notice to LICENSOR. This insurance will remain in effect until three (3)
     years from termination of this Agreement.




                                       19

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  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   20
14.  GENERAL

(a)  This SUBLICENSE AGREEMENT, including the Appendix hereto attached,
     constitutes the entire agreement and understanding between the parties as
     to the PATENT RIGHTS. All prior negotiations, representations, agreements,
     contracts, offers and earlier understandings of whatsoever kind, whether
     written or oral between LICENSOR and LICENSEE in respect of the PATENT
     RIGHTS, are superseded by, merged into, extinguished by and completely
     expressed by this SUBLICENSE AGREEMENT.

     No aspect, part or wording of this SUBLICENSE AGREEMENT may be modified
     except by mutual agreement between the LICENSOR and LICENSEE taking the
     form of an instrument in writing signed and dated by duly authorized
     representatives of both LICENSOR and LICENSEE.

(b)  Any notice required or permitted to be given by this SUBLICENSE AGREEMENT
     shall be given by post-paid, first class, registered or certified mail
     addressed to:

                                General Counsel

                               Johnson & Johnson

                          One Johnson & Johnson Plaza

                      New Brunswick, New Jersey 08903-5501

                                      and

                                    Chairman

                 R.W. Johnson Pharmaceutical Research Institute

                                   Route 202

                           Raritan, New Jersey 08869


                                       or


                                       20


<PAGE>   21
                       SANGAMO BIOSCIENCES, INCORPORATED

                           950 MARINA VILLAGE PARKWAY

                                   SUITE 100

                               ALAMEDA, CA 94501


     Such addresses may be altered by notice so given. If no time limit is
     specified for a notice required or permitted to be given by this
     SUBLICENSE AGREEMENT, the time limit therefor shall be ten (10) full
     business days, not including the day of mailing. Notice shall be
     considered made as of the date of deposit with the United States Post
     Office.

(c)  This SUBLICENSE AGREEMENT and its effect are subject to and shall be
     construed and enforced in accordance with the laws of the State of New
     Jersey, United States, except as to any issue which depends upon the
     validity, scope or enforceability of any patent within the PATENT RIGHTS,
     which issue shall be determined in accordance with the applicable patent
     laws of the country of such patent.

(d)  Any controversy or claim arising out of or relating to this Agreement, or
     the breach thereof, including any dispute relating to patent validity or
     infringement arising under this agreement, shall be settled by
     arbitration. Such arbitration shall be conducted at New York, New York, in
     accordance with the rules then pertaining to the American Arbitration
     Association with a panel of three (3) arbitrators. One arbitrator shall be
     appointed by LICENSOR; one shall be appointed by LICENSEE; and the third
     shall be appointed by the American Arbitration Association. The law of the
     State of New York shall apply to the arbitration proceedings. The
     arbitrators shall have the authority to grant specific performance. The
     judgment and award of the arbitrators shall be final and binding and may be
     entered in any court having jurisdiction thereof, or application may be
     made to such court for judicial acceptance of any award or an order of
     enforcement, as the case may be. Each party shall bear its own costs and
     expenses, including attorney's fees and fees and expenses of the
     arbitrator it selects, and shall

                                       21
<PAGE>   22
     share equally the fees and expenses of the arbitrator selected by the
     American Arbitration Association.

(e)  Nothing in this SUBLICENSE AGREEMENT shall be construed so as to require
     the commission of any act contrary to law, and wherever there is any
     conflict between any provision of this SUBLICENSE AGREEMENT or concerning
     the legal right of the parties to contract and any statute, law, ordinance
     or treaty, the latter shall prevail, but in such event the affected
     provisions of this SUBLICENSE AGREEMENT shall be curtailed and limited
     only to the extent necessary to bring it within the applicable legal
     requirements.

(f)  LICENSEE shall take all reasonable and necessary steps to register this
     SUBLICENSE AGREEMENT in any country where such is required to permit the
     transfer of funds and/or payment of royalties to LICENSOR hereunder or is
     otherwise required by the government or law of such country to effectuate
     or carry out this SUBLICENSE AGREEMENT. Notwithstanding anything contained
     herein, but subject to Article 13(e) hereof, LICENSEE shall not be
     relieved of any of its obligations under this SUBLICENSE AGREEMENT by any
     failure to register this SUBLICENSE AGREEMENT in any country, and,
     specifically, LICENSEE shall not be relieved of its obligation to make any
     payment due to LICENSOR hereunder at LICENSOR's address specified in
     Article 14(b) hereof, where such payment is blocked due to any failure to
     register this SUBLICENSE AGREEMENT.

(g)  As used in this SUBLICENSE AGREEMENT, singular includes the plural and
     plural includes the singular, wherever so required by the context. The
     headings appearing at the beginning of the numbered Articles hereof have
     been inserted for convenience only and do not constitute a part of this
     SUBLICENSE AGREEMENT.

(h)  Nothing herein shall be deemed to create an agency, joint venture or
     partnership between the parties hereto.

                                       22
<PAGE>   23
(i)   Notwithstanding any other provisions of this SUBLICENSE AGREEMENT, neither
      of the parties hereto shall be liable in damages or have the right to
      terminate this SUBLICENSE AGREEMENT for any delay or default in
      performing hereunder if such delay or default is caused by conditions
      beyond its control including, but not limited to acts of God,
      governmental restrictions, wars, or insurrections, strikes, floods, work
      stoppages and/or lack of materials; provided, however, that the party
      suffering such delay or default shall notify the other party in writing
      of the reasons for the delay or default. If such reasons for delay or
      default continuously exist for six (6) months, this SUBLICENSE AGREEMENT
      may be terminated by either party.

15.   EFFECTIVE DATE AND TERM

      This SUBLICENSE AGREEMENT shall become effective on the day and year
      first above written and shall, unless terminated earlier by one of the
      parties in accord with its terms, expire concurrently with the
      expiration, invalidation or lapsing of all issued patents within the
      PATENT RIGHTS and/or the abandonment of all pending patent applications
      within the PATENT RIGHTS.

16.   GOVERNMENT RIGHTS

(a)   LICENSEE acknowledges and agrees that its respective rights and
      obligations pursuant to this SUBLICENSE AGREEMENT shall be subject to
      *    *   rights and    *     obligations and the rights of the United
      States Government, if any, which arose or resulted from    *     receipt
      of research support from the United States Government.

(b)   LICENSEE shall comply in all respects with the applicable provisions of
      any applicable law, requirement, regulation or determination by any
      Government relating to the PATENT RIGHTS and shall provide LICENSOR with
      any information or report required to comply with any such law,
      requirement, regulation or determination.



* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.


                                       23
<PAGE>   24
(c)   Any inconsistency between this SUBLICENSE AGREEMENT and the pertinent
      provisions of any law, requirement, regulation or determination by a
      Government shall be resolved by conforming this SUBLICENSE AGREEMENT to
      such provisions of any such law, requirement, regulation or determination.

(d)   Any agreement or arrangement relating to the PATENT RIGHTS between
      LICENSEE and any third party hereto shall be made expressly subject to
      the terms and conditions of this Article 16 and LICENSEE shall require
      such other party to comply therewith to the same extent that LICENSEE is
      required to comply.

(e)   Any license or other right granted or to be granted pursuant to this
      SUBLICENSE AGREEMENT shall be subject to any and all applicable
      governmental laws and regulations relating to compulsory licensing.



                                       24
<PAGE>   25
IN WITNESS WHEREOF, the parties hereto have hereunto set their hands and duly
executed this SUBLICENSE AGREEMENT on the date(s) indicated below, to be
effective the day and year first above written.


For and on Behalf of LICENSOR, JOHNSON & JOHNSON

By:     /s/ RONALD G. GELBMAN
        ---------------------------------------------

Name:   Ronald G. Gelbman
        ---------------------------------------------

Title:  Worldwide Chairman
        ---------------------------------------------

        Pharmaceuticals & Diagnostics Group
Date:            April 15, 1996
        ---------------------------------------------


For and on Behalf of LICENSEE, SANGAMO BIOSCIENCES, INCORPORATED

By:     /s/ EDWARD LANPHIER
        ----------------------------------------------

Name:   Edward Lanphier
        ----------------------------------------------

Title:  President
        ----------------------------------------------

                                       25

<PAGE>   1

                                                                    EXHIBIT 10.9



                         ZFP MATERIAL TRANSFER AGREEMENT

        THIS ZFP CUSTOM SYNTHESIS AGREEMENT (the "Agreement") dated as of March
8, 1999 ("Effective Date"), is entered into between SANGAMO BIOSCIENCES, INC., a
Delaware corporation ("Sangamo"), having a place of business at Point Richmond
Tech Center, 501 Canal Boulevard, Suite A100, Richmond, California 94804, and
Japan Tobacco Inc., a Japanese corporation (the "Customer"), having a place of
business at    *     *     *     *     *     *     *     *     *     *.

        WHEREAS, Sangamo has rights and expertise regarding the design and
synthesis of certain zinc finger DNA recognition proteins and genes encoding
such proteins.

        WHEREAS, the Customer desires to have Sangamo design, assemble,
characterize and deliver to Customer certain of these materials solely for the
Customer's own internal research (except as otherwise expressly provided herein)
and preclinical development purposes on the terms and conditions set forth in
this Agreement.

        NOW, THEREFORE, in consideration of the foregoing premises and the
mutual covenants set forth below, the parties agree as follows:

        I. Definitions. For purposes of this Agreement, the terms defined in
this Section 1 shall have the respective meanings set forth below:

               1.1 "Affiliate" shall mean, with respect to any Person, any other
Person which directly or indirectly controls, is controlled by, or is under
common control with, such Person. A Person shall be in control of another Person
if it owns, or directly or indirectly controls, at least fifty percent (50%) of
the voting stock or other ownership interest of the other Person, or if it
directly or indirectly possesses the power to direct or cause the direction of
the management and policies of the other Person by any means. Notwithstanding
the foregoing, the government of Japan shall not be deemed an Affiliate.

               1.2 "Confidential Information" shall mean, with respect to a
party, all information (and all tangible and intangible embodiments thereof)
which is disclosed by such party to the other party and is marked as
"Confidential" by each party, identified as or otherwise acknowledged to be
confidential at the time of disclosure to the other party. Each party shall also
confirm in writing within thirty (30) days any Confidential Information that it
discloses orally. Notwithstanding the foregoing, Confidential Information of a
party shall not include information which the other party can establish by
written documentation (a) to have been publicly known prior to disclosure of
such information by the disclosing party to the other party, (b) to have become
publicly known, without the fault of the other party, subsequent to disclosure
of such information by the disclosing party to the other party, (c) to have been
received by the other party at any time from a source, other than the disclosing
party, rightfully having possession of and the right to disclose such
information, (d) to have been otherwise known by the other party prior to
disclosure of such information by the disclosing party to the other party, or
(e) to have been


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   2

independently developed by employees or agents of the other party without access
to or use of such information disclosed by the disclosing party to the other
party.

               1.3 "Derivative" shall mean any protein or conjugate (including a
conjugate to a functional domain other than the Functional Domain) derived from
a ZFP, provided that the contiguous amino acid sequence of such ZFP has not been
altered, and the amino acid sequence of such protein or conjugate, except for
progeny.

               1.4 "Functional Domain" shall mean the functional domain set
forth on Schedule A, to which each ZFP shall be conjugated by Sangamo hereunder.

               1.5 "Genetic Material" shall mean, with respect to any ZFP or
Derivative, the nucleotide sequence encoding such ZFP or Derivative and all
fragments of such gene sequence.

               1.6 "Person" shall mean an individual, corporation, partnership,
limited liability company, trust, business trust, association, joint stock
company, joint venture, pool, syndicate, sole proprietorship, unincorporated
organization, governmental authority or any other form of entity not
specifically listed herein.

               1.7 "Progeny" shall mean any biological progeny which contains
the ZFP Materials originated by the Customer including but not limited to cells
and animals.

               1.8 "Research Field" shall mean the research and preclinical
development of products and services for use in the diagnosis, prevention or
treatment of any disease, state or condition in humans (excluding the sale or
provision of, to any third parties, products and services that incorporate,
contain or use zinc finger DNA recognition proteins, genes that encode such
proteins, or fragments or derivatives of such proteins or genes).

               1.9 "Target(s)" shall mean the nucleotide sequence(s) set forth
on Schedule A.

               1.10 "ZFP" shall mean a zinc finger DNA recognition protein
binding to the Target which is designed by Sangamo and for which the Genetic
Material is delivered to the Customer hereunder, and the amino acid sequence of
such protein.

               1.11 "ZFP Materials" shall mean, collectively, the ZFPs, any
Derivatives, the Genetic Materials which encode any ZFP or Derivative, and all
fragments and derivatives of the foregoing.

        2. Design and Delivery of ZFP Materials.

               2.1 Promptly after the date of this Agreement, the Customer shall
deliver to Sangamo the nucleotide sequence for  *  Target(s) and such other
information as the parties mutually agree is reasonably necessary to assist
Sangamo in designing the ZFPs. Notwithstanding the foregoing, the Customer shall
have final discretion with respect to the provision of such information.

               2.2 Sangamo shall design, assemble and characterize two (2) zinc
finger DNA recognition proteins binding to each Target.
<PAGE>   3

               2.3 Within *  weeks after receipt of the information described in
Section 2.1 above, Sangamo shall deliver to the Customer certain information
regarding the characterization of each ZFP (including data and specifications
regarding the binding sites, affinities, and in vivo co-transfection reporter
activation assays) that is reasonably necessary for the Customer to use the ZFP
Materials in the Research Field. Sangamo will consult by telephone or facsimile
or visits at mutually agreeable times at no additional cost to Customer with
Customer's employees to answer questions related to the ZFP Materials.

               2.4 Within      *      days after delivery of the   *   Target to
Sangamo, the Customer shall pay Sangamo      *     *     *     *     *     *
   *      Within     *     * days after delivery of the second Target to
Sangamo, the Customer shall pay Sangamo      *     *     *     *     *     *
Such payment shall be in United States Dollars in immediately available funds
and shall be made by wire transfer from a United States bank located in the
United States to such bank account as designated by Sangamo to the Customer.

                      Within      *     *     days after the Customer receives
the materials and information described in Section 2.3 above, the Customer shall
make diligent and good faith efforts to confirm the activity of the relevant
Target ZFPs in the same assays that Sangamo has used pursuant to section 2.3.
The Customer shall then pay Sangamo      *     *     *     *     *     *
for the first Target   *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *
for the second Target. If the Customer is unable to confirm the activity of a
ZFP in the same assays as used by Sangamo, then Sangamo, shall redesign and
deliver redesigned ZFP Materials to the Customer within 8 weeks after the
Customer so notifies Sangamo. In the event that the Customer is unable to
confirm activity of the re-designed ZFP Materials then the Customer shall have
no obligation to make any additional payments. Payment shall be in United States
Dollars in immediately available funds and shall be made by wire transfer from a
United States bank located in the United States to such bank account as
designated by Sangamo to the Customer.

                      Sangamo shall issue signed invoices in advance for each
payment due hereunder. Withholding tax shall be deducted from the payments made
by the Customer to the proper tax authority and a receipt of payments of the tax
secured and promptly delivered to Sangamo.

               2.5 In connection with the shipping of Materials, Sangamo agrees
to pay for all shipping, handling, and customs duty related costs.

        3. Use of ZFP Materials.

               3.1 The Customer shall use the ZFP Materials (and all results of
its activities in the Research Field hereunder) solely in the Research Field,
and not for any other purpose.

               3.2 The Customer shall not alter the nucleotide sequence or amino
acid sequence of, or reverse engineer, the ZFP Materials; provided, however,
that the Customer may make Derivatives of the ZFPs.

               3.3 The Customer shall use the ZFP Materials under commercially
and scientifically reasonable containment conditions. The Customer shall not
transfer or provide access to the ZFP Materials to any other Person.
Notwithstanding the foregoing, the Customer


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   4

may transfer the ZFP Materials to an Affiliate (without the further right to
transfer), provided (a) the Customer shall give prior express written notice
thereof to Sangamo, and (b) such Affiliate agrees to be bound by the terms and
conditions set forth in this Agreement binding on the Customer. The Customer may
also transfer ZFP Materials to its research partners without any additional
charges or fees, subject to agreement by such partners of the terms and
conditions set forth in this Agreement and with the prior written consent of
Sangamo, such consent not to be unreasonably withheld. The Customer shall limit
access to the ZFP Materials to those of its employees and consultants working on
its premises to the extent such access is reasonably necessary to the conduct of
its activities in the Research Field.

               3.4 The Customer shall not (and shall not attempt or purport to)
sell, license or otherwise transfer title to or an interest in, or otherwise
commercially use the ZFP Materials without the prior express written consent of
Sangamo.

               3.5 The Customer acknowledges that the ZFP Materials are
experimental in nature, may have unknown characteristics and have not been
approved for use in humans. The Customer shall use prudence and reasonable care
in the use, handling, storage, transportation, disposition and containment of
the ZFP Materials, and shall comply with all applicable laws, regulations and
guidelines applicable to the ZFP Materials or the use thereof and with any
safety precautions accompanying the ZFP Materials. The Customer shall not (and
shall not attempt or purport to) administer the ZFP Materials to humans, or file
or submit any regulatory application or other submission to obtain approval
therefor.

        4. Non-Assertion. Neither the Customer nor its Affiliates (nor their
respective successors, assigns, licensees or other transferees) shall enforce
(or attempt or purport to enforce) against Sangamo or its Affiliates, licensees
(of rights in zinc finger DNA recognition proteins) or manufacturers,
distributors or other purchasers (of zinc finger DNA recognition proteins) any
patent that claims zinc finger DNA recognition proteins, Genetic Materials
encoding such proteins, fragments of such proteins or Genetic Materials, or the
use of any of the foregoing, subject, expressly, to section 10.

        5. No Prohibition on Sangamo. Nothing in this Agreement shall prohibit
Sangamo from making, using, offering for sale, selling to others or importing
zinc finger DNA recognition proteins, genetic materials encoding such proteins,
fragments of such proteins or genetic materials or from licensing others to do
the same; provided, however, that Sangamo shall not design, assemble,
characterize and deliver to any other Person any zinc finger DNA recognition
protein binding to the Target (or genetic material encoding such protein) in
less time than the time frame published by Sangamo      *       for its custom
design, assembly, characterization and delivery of a zinc finger DNA recognition
protein (or genetic material encoding such protein) generally.

             *

               THE CUSTOMER ACKNOWLEDGES THAT THE ZFP MATERIALS ARE PROVIDED "AS
IS" AND THAT SANGAMO MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS
FOR ANY PARTICULAR PURPOSE OR NONINFRINGEMENT OF THE PATENT RIGHTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER PERSON.


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>   5

                    *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *

                    *
     *     *     *     *     *     *     *     *     *     *     *     *     *
     *     *     *     *     *     *     *     *     *     *     *     *     *

        7. Confidentiality.

               7.1 For a period of five (5) years following the date of this
Agreement, subject to the Confidential Disclosure Agreement between Sangamo and
the Customer as of March 8, 1999, and January 12, 1999, each party shall
maintain in confidence all Confidential Information disclosed by the other
party, and shall not use, disclose or grant the use of the Confidential
Information except on a need-to-know basis to its directors, officers, employees
and consultants to the extent such disclosure is reasonably necessary in
connection with such party's activities expressly authorized by this Agreement
and ordinary business operations. Each party shall notify the other promptly
upon discovery of any unauthorized use or disclosure of the other party's
Confidential Information.

               7.2 Sangamo shall not disclose the identity of the Target and the
information relating to the Target to any other Person without the prior consent
of the Customer. Neither party shall disclose any terms or conditions set forth
in this Agreement to any other Person without the prior consent of the other
party; provided, however, that a party may disclose the terms or conditions set
forth in this Agreement, (a) on a need-to-know basis to its legal and financial
advisors to the extent such disclosure is reasonably necessary in connection
with such party's activities as expressly permitted by this Agreement, and (b)
to a third party in connection with (i) an equity investment in such party, (ii)
a merger, consolidation or similar transaction by such party, or (iii) the sale
of all or substantially all of the assets of such party.

               7.3 The confidentiality obligations contained in this Section 7
shall not apply to the extent information is required to be disclosed to a
governmental agency or is necessary to file or prosecute patent applications or
to the extent that a party is required to disclose information by applicable
law, regulation or order of a court of competent jurisdiction, provided that
such party shall provide written notice to the other party and sufficient
opportunity to object to any such disclosure or to request confidential
treatment. The Customer may disclose Confidential Information of Sangamo
relating to the results of the Customer's research and evaluation hereunder to
any Affiliate.

               7.4 To the extent that a party is authorized by this Agreement to
disclose Confidential Information of the other party to any other Person, prior
to disclosure, such party shall obtain agreement of any such Person to hold in
confidence and not use the Confidential Information of the other party for any
purpose other than those permitted by this Agreement.

        8. Indemnification and Insurance.

               8.1 The Customer shall indemnify and hold harmless Sangamo from
and against all losses, liabilities, damages and expenses (including reasonable
attorneys' fees and costs) resulting from all claims, demands, actions and other
proceedings by any other Person to


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>   6
the extent arising from (a) the use by Sangamo of the Target under this
Agreement, unless due to reasons relating to Sangamo's ZFP Materials, (b) the
breach by the Customer of any covenant under this Agreement, or (c) the use by
the Customer or its Affiliates of the ZFP Materials or the results of their
respective activities hereunder, except in each case to the extent any such
loss, liability, damage or expense results from the negligence or willful
misconduct of Sangamo.

               8.2 EXCEPT AS OTHERWISE SET FORTH IN THIS SECTION 8, IN NO EVENT
SHALL EITHER PARTY BE LIABLE FOR LOSS OF PROFITS OR INCIDENTAL, SPECIAL,
CONSEQUENTIAL OR PUNITIVE DAMAGES OF THE OTHER PARTY DIRECTLY OR INDIRECTLY
ARISING OUT OF THIS AGREEMENT.

        9. Miscellaneous.

               9.1 This Agreement shall be governed by and construed in
accordance with the laws of the State of California, without regard to the
conflicts of law principles thereof.

               9.2 This Agreement does not grant to the Customer any license or
other right in the patent rights or other intellectual property rights of
Sangamo except and only to the extent necessary to enable the Customer to
conduct its internal research and preclinical development permitted hereby.

               9.3 For the period from the date of this Agreement through the
date that is one (1) year after the date Sangamo delivers to the Customer the
ZFP Materials and information under Section 2.3 above, neither the Customer nor
its Affiliates shall directly or indirectly solicit or in any manner encourage
any employee of Sangamo to leave its employ.

               9.4 Neither party shall assign or otherwise transfer (whether
voluntarily, by operation of law or otherwise) this Agreement or any right or
obligation hereunder, without the prior express written consent of the other;
provided, however, that either party may, without such consent, assign this
Agreement and its rights and obligations hereunder in connection with the
transfer or sale of all or substantially all of its business, or in the event of
its merger, consolidation, change in control or similar transaction. Any
permitted assignee shall assume all obligations of its assignor under this
Agreement. Any purported assignment or transfer in violation of this Section 9.4
shall be void.

               9.5 This Agreement contains the entire understanding of the
parties regarding the subject matter hereof. All express or implied
representations, agreements and understandings, either oral or written,
heretofore made are expressly superseded by this Agreement.

       10. Ownership. All data and results of experiments obtained by the
Customer through the use of the ZFP Materials (the "Results") and inventions
from the use of the ZFP Materials shall be exclusively owned by the Customer and
the Customer shall have the right to use them for whatever purposes as it
desires, provided, however, that the use of the Progeny shall be limited to the
Research Field. For the avoidance of doubt, Sangamo shall not have the right to
use, commercialize, or otherwise exploit for whatever purpose the Results or any
of the Customer's inventions from the use of the ZFP Materials.

       11. Publication. Customer may publish the Results at its sole discretion
provided

<PAGE>   7

that Sangamo Confidential Information shall be removed from such publications
or written permission obtained from Sangamo prior to the use of such
Information, such permission not to be unreasonably withheld.

        12. Term and Termination

               12.1 This Agreement shall commence on the Effective Date and
unless sooner terminated as provided below, shall remain until the conclusion of
the evaluation stated in Section 3. At the conclusion of this term, this
Agreement may be amended or extended by mutual written consent of the parties.

               12.2 Upon termination of this Agreement, for any reason, Customer
shall return or destroy all unused Genetic Materials to Sangamo if so requested
by Sangamo, and shall provide written certification within thirty (30) days in
case of such destruction.

               12.3 The provisions of Sections 4, 6, 7, 8, 9, 10, and 11 shall
survive any termination of this Agreement.

        IN WITNESS WHEREOF, the parties have entered into the Agreement
effective as of the date first written above.


                                        SANGAMO BIOSCIENCES, INC.


                                        By:

                                        Title:


                                        JAPAN TOBACCO INC.


                                        By:

                                        Title:



<PAGE>   8


                                [JT LETTERHEAD]


June 18, 1999


Sangamo BioSciences, Inc.
Point Richmond Tech Center II
501 Canal Blvd., Suite A 100
Richmond, CA 94804


Attention: Dr. Eric Rhodes
           Director, Commercial Development

RE:        Amendment of ZFP Material Transfer Agreement dated March 9, 1999.

Gentlemen:

The purpose of this letter is to hereby confirm our mutual understanding that,
with respect to the March 9, 1999 ZFP Material Transfer Agreement, as set forth
below;

1. Section 7.1 shall be amended as follows:

   "For a period of five (5) years following the date of this Agreement, subject
   to the Confidential Disclosure Agreements between Sangamo and the Customer as
   of June 15, 1999, and March 8, 1999 and January 12, 1999, each party shall
   maintain in confidence all Confidential Information disclosed by the other
   party, and shall not use, disclose or grant the use of the Confidential
   Information except on a need-to-know basis to its directors, officers,
   employees and consultants to the extent such disclosure is reasonably
   necessary in connection with such party's activities expressly authorized by
   this Agreement and ordinary business operations. Each party shall notify the
   other promptly upon discovery of any unauthorized use or disclosure of the
   other party's Confidential Information."

2. Schedule A shall be amended as set forth in the attachment hereto.

Please confirm your acknowledgement of and agreement with the above, by duly
signing and dating in the spaces provided below.


Sincerely yours,

/s/     *
- -----------------------------
        *
Vice President


Sangamo BioSciences Inc.

By:  /s/ PETER BLUFORD
    --------------------------------

Name: Peter Bluford

Title: VP, Corp. Div.

Date: 7-1-99


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>   1

                                                                  EXHIBIT 10.12

                     MASSACHUSETTS INSTITUTE OF TECHNOLOGY

                                      and

                            SANGAMO BIOSCIENCES,INC.



                            PATENT LICENSE AGREEMENT
<PAGE>   2
11-7-94                                         TLO: LLN:jbw.sangamo.lic.ag41796
Patent Exclusive                                                  April 17, 1996



<TABLE>
<CAPTION>
                               TABLE OF CONTENTS

     <S>                                                               <C>
     WITNESSETH ......................................................  1

     1  DEFINITIONS ..................................................  2

     2  GRANT ........................................................  3

     3  DILIGENCE ....................................................  4

     4  ROYALTIES ....................................................  5

     5  REPORTS AND RECORDS ..........................................  6

     6  PATENT PROSECUTION ...........................................  7

     7  INFRINGEMENT .................................................  8

     8  PRODUCT LIABILITY ............................................  9

     9  EXPORT CONTROLS .............................................. 10

     10 NON-USE OF NAMES ............................................. 10

     11 ASSIGNMENT ................................................... 10

     12 DISPUTE RESOLUTION ........................................... 10

     13 TERMINATION .................................................. 11

     14 PAYMENTS, NOTICES AND OTHER COMMUNICATIONS ................... 12

     15 MISCELLANEOUS PROVISIONS ..................................... 13

     APPENDIX A ...................................................... 14
</TABLE>
<PAGE>   3

                     MASSACHUSETTS INSTITUTE OF TECHNOLOGY

                                      and

                           SANGAMO BIOSCIENCES, INC.


                            PATENT LICENSE AGREEMENT


     This Agreement is made and entered into this 9 day of MAY, 1996, (the
"EFFECTIVE DATE") by and between the MASSACHUSETTS INSTITUTE OF TECHNOLOGY, a
corporation duly organized and existing under the laws of the Commonwealth of
Massachusetts and having its principal office at 77 Massachusetts Avenue,
Cambridge, Massachusetts 02139, U.S.A. (hereinafter referred to as "M.I.T."),
and Sangamo BioSciences, Inc. a corporation duly organized under the laws of
DELAWARE and having its principal office at 950 MARINA VILLAGE PKWY, SUITE 100,
ALAMEDA, CA 94501 (hereinafter referred to as "LICENSEE").

                                   WITNESSETH

     WHEREAS, M.I.T. is the owner of certain PATENT RIGHTS (as later defined
herein) relating to M.I.T. Case No. 6929, "Zinc Finger Proteins With High
Affinity New DNA Binding Specificities" by Carl O. Pabo and Edward J. Rebar and
has the right to grant licenses under said PATENT RIGHTS, subject only to a
royalty-free, nonexclusive license heretofore granted to the United States
Government;

     WHEREAS, M.I.T. desires to have the PATENT RIGHTS developed and
commercialized to benefit the public and is willing to grant a license
thereunder;

     WHEREAS, LICENSEE has represented to M.I.T., to induce M.I.T. to enter
into this Agreement, that LICENSEE is experienced in the development,
production, manufacture, marketing and sale of products similar to the LICENSED
PRODUCT(s) (as later defined herein) and/or the use of the LICENSED
PROCESS(es) (as later defined herein) and that it shall commit itself to a
thorough, vigorous and diligent program of exploiting the PATENT RIGHTS so that
public utilization shall result therefrom; and

     WHEREAS, LICENSEE desires to obtain a license under the PATENT RIGHTS upon
the terms and conditions hereinafter set forth.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein, the parties hereto agree as follows:

                                      -1-

<PAGE>   4


                                1-DEFINITIONS

     For the purposes of this Agreement, the following words and phrases shall
have the the following meanings:

     1.1  "LICENSEE" shall include a related company of Sangamo BioSciences,
Inc. the voting stock of which is directly or indirectly at least Fifty Percent
(50%) owned or controlled by Sangamo BioSciences, Inc., an organization which
directly or indirectly controls more than Fifty Percent (50%) of the voting
stock of Sangamo BioSciences, Inc. and an organization, the majority ownership
of which is directly or indirectly common to the ownership of Sangamo
BioSciences, Inc.

     1.2  "PATENT RIGHTS" shall mean all of the following M.I.T. intellectual
property:

          a.   the United States patents listed in Appendix A;

          b.   the United States patent applications listed in Appendix A, and
               divisionals, continuations and claims of continuation-in-part
               applications which shall be directed to subject matter
               specifically described in such patent applications, and the
               resulting patents;

          c.   any patents resulting from reissues or reexaminations of the
               United States patents described in a. and b. above;

     1.3  A "LICENSED PRODUCT" shall mean any product or part thereof which:

          a.   is covered in whole or in part by an issued, unexpired claim or
               a pending claim contained in the PATENT RIGHTS in the country in
               which any such product or part thereof is made, used or sold; or

          b.   is manufactured by using a process or is employed to practice a
               process which is covered in whole or in part by an issued,
               unexpired claim or a pending claim contained in the PATENT
               RIGHTS in the country in which any LICENSED PROCESS is used or
               in which such product or part thereof is used or sold.

     1.4  A "LICENSED PROCESS" shall mean any process which is covered in whole
or in part by an issued, unexpired claim or a pending claim contained in the
PATENT RIGHTS.

     1.5 "NET SALES" shall mean LICENSEE's and its sublicensees' billings for
LICENSED PRODUCTS and LICENSED PROCESSES less the sum of the following:

          a.   discounts allowed in amounts customary in the trade for quantity
               purchases, cash payments, prompt payments, wholesalers and
               distributors;

          b.   sales, tariff duties and/or use taxes directly imposed and with
               reference to particular sales;

          c.   outbound transportation prepaid or allowed; and

          d.   amounts allowed or credited on returns.

                                      -2-

<PAGE>   5
     No deductions shall be made for commissions paid to individuals whether
they be with independent sales agencies or regularly employed by LICENSEE and
on its payroll, or for cost of collections. NET SALES shall occur when a
LICENSED PRODUCT or LICENSED PROCESS shall be invoiced. If a LICENSED PRODUCT
or LICENSED PROCESS shall be distributed or invoiced for a discounted price
substantially lower than customary in the trade or distributed at no cost to
affiliates or otherwise, NET SALES shall be based on the customary amount
billed for such LICENSED PRODUCTS or LICENSED PROCESSES.

     1.6  "TERRITORY" shall mean worldwide.

     1.7  "FIELDS OF USE" shall mean commercial research and development,
          manufacture, and sales of LICENSED PRODUCTS or LICENSED PROCESSES
          which contain, use or act on restriction enzymes and
          integrases/recombinases.

     Note: LICENSEE's rights to practice under the PATENT RIGHTS shall be in
     all FIELDS OF USE. The purpose of this FIELDS OF USE definition is to
     define the fields in which exclusivity is granted under this license under
     P. 2.3 below and in which LICENSEE may grant sublicenses under P. 2.6
     below.

                                   2 - GRANT

     2.1  M.I.T. hereby grants to LICENSEE the right and license in the
TERRITORY to practice under the PATENT RIGHTS and, to the extent not prohibited
by other patents, to make, have made, use, lease, sell and import LICENSED
PRODUCTS and to practice the LICENSED PROCESSES, until the expiration of the
last to expire of the PATENT RIGHTS, unless this Agreement shall be sooner
terminated according to the terms hereof.

     2.2  LICENSEE agrees that LICENSED PRODUCTS leased or sold in the United
States shall be manufactured  substantially in the United States.

     2.3  In order to establish exclusivity in the FIELDS OF USE for LICENSEE,
M.I.T. hereby agrees that it shall not grant any other license to make, have
made, use, lease, sell and import LICENSED PRODUCTS or to utilize LICENSED
PROCESSES subject to the royalty-free, nonexclusive license rights of the United
States Government per FAR 52.227-11, in the TERRITORY for the FIELDS OF USE.

     2.4  M.I.T. agrees that prior to granting a license to any third party
outside the defined FIELDS OF USE, it shall notify LICENSEE of its intent to
grant such a license and LICENSEE shall have sixty (60) days in which to
present to M.I.T. reasons for widening LICENSEE's exclusive FIELD OF USE beyond
that defined in P.1.7 above. M.I.T. shall consider granting such widening to
LICENSEE, for suitable consideration, depending upon LICENSEE's scientific
progress, development plans and financial resources to develop the widened
FIELD OF USE.


                                      -3-

<PAGE>   6
Any decision to widen the exclusive FIELD OF USE granted to LICENSEE shall be
at M.I.T.'s sole discretion.

     2.5 M.I.T. reserves the right to practice under the PATENT RIGHTS and to
allow third parties to practice under the PATENT RIGHTS in all fields of use
for noncommercial research purposes.

     2.6 LICENSEE shall have the right to enter into sublicensing agreements for
the rights, privileges and licenses granted hereunder only in the FIELDS OF USE.
Upon any termination of this Agreement, sublicensees' rights shall also
terminate, subject to Paragraph 13.6 hereof.

     2.7 LICENSEE agrees to incorporate Articles 2, 5, 7, 8, 9, 10, 12, 13 and
15 of this Agreement into its sublicense agreements, so that these Articles
shall be binding upon such sublicensees as if they were parties to this
Agreement.

     2.8 LICENSEE agrees to forward to M.I.T. a copy of any and all sublicense
agreements promptly upon execution by the parties.

     2.9 Nothing in this Agreement shall be construed to confer any rights upon
LICENSEE by implication, estoppel or otherwise as to any technology or patent
rights of M.I.T. or any other entity other than the PATENT RIGHTS, regardless
of whether such patent rights shall be dominant or subordinate to any PATENT
RIGHTS.

                                 3 - DILIGENCE

     3.1 LICENSEE shall use its best efforts to bring one or more LICENSED
PRODUCTS or LICENSED PROCESSES to market through a thorough, vigorous and
diligent program for exploitation of the PATENT RIGHTS and to continue active,
diligent marketing efforts for one or more LICENSED PRODUCTS or LICENSED
PROCESSES throughout the life of this Agreement.

     3.2 LICENSEE shall deliver to M.I.T. on or before December 31, 1996 a
business plan showing the amount of money, number and kind of personnel and
time budgeted and planned for each phase of development of the LICENSED
PRODUCTS and LICENSED PROCESSES and shall provide similar reports to M.I.T. on
or before December 31 of each year.

     3.3 LICENSEE's failure to perform in accordance with either Paragraph 3.1
or 3.2 above shall be grounds for M.I.T. to terminate this Agreement pursuant
to Paragraph 13.3 hereof.

                                 4 - ROYALTIES

     4.1 For the rights, privileges and license granted hereunder, LICENSEE
shall pay royalties to M.I.T. in the manner hereinafter provided to the end of
the term of the PATENT RIGHTS or until this Agreement shall be terminated:



                                      -4-
<PAGE>   7
       a.   License Issue Fee of                  *                 , which said
            License Issue Fee shall be deemed earned and due immediately upon
                    *        .

       b.   License Maintenance Fees of             *              *
                      per year payable on January 1, 1997 and on January 1 of
            each year thereafter; provided, however, License Maintenance Fees
            may be credited to Running Royalties subsequently due on NET SALES
            for each said year, if any. License Maintenance Fees paid in excess
            of Running Royalties shall not be creditable to Running Royalties
            for future years.

       c.   Running Royalties in an amount equal to           *           of NET
            SALES of the LICENSED PRODUCTS and LICENSED PROCESSES used, leased
            or sold by and/or for LICENSEE and/or its Sublicensees.

       d.   A milestone payment of                       *
                  *      upon                        *                        a
            LICENSED PRODUCT or LICENSED PROCESS in the FIELDS OF USE which
            falls under the claims of the PATENT RIGHTS.

       e.   A milestone payment of                 *                ) upon the
                                  *                       a LICENSED PRODUCT or
            LICENSED PROCESS outside the FIELDS OF USE which falls under the
            claims of the PATENT RIGHTS.

       f.   A milestone payment of                      *
            upon                           *                          a LICENSED
            PRODUCT or LICENSED PROCESS in the FIELDS OF USE which falls under
            the claims of the PATENT RIGHTS.

       g.   A milestone payment of                      *
            upon                          *                           a LICENSED
            PRODUCT or LICENSED PROCESS outside the FIELDS OF USE which falls
            under the claims of the PATENT RIGHTS.

       h.                 *                 per sublicense granted, plus * per
            year sublicense maintenance fees.

  4.2 All payments due hereunder shall be paid in full, without deduction of
taxes or other fees which may be imposed by any government, except as otherwise
provided in Paragraph 1.5(b).

   4.3 No multiple royalties shall be payable because any LICENSED PRODUCT, its
manufacture, use, lease or sale are or shall be covered by more than one PATENT
RIGHTS patent application or PATENT RIGHTS patent licensed under this Agreement.

  4.4 Royalty payments shall be paid in United States dollars in Cambridge,
Massachusetts, or at such other place as M.I.T. may reasonably designate
consistent with the laws and regulations controlling in any foreign country. If
any currency conversion shall be required in connection with the payment of
royalties hereunder, such conversion shall be made by using the exchange rate


                                      -5-

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   8
prevailing at the Chase Manhattan Bank (N.A.) on the last business day of the
calendar quarterly reporting period to which such royalty payments relate.

                            5 - REPORTS AND RECORDS

     5.1 LICENSEE shall keep full, true and accurate books of account
containing all particulars that may be necessary for the purpose of showing
the amounts payable to M.I.T. hereunder. Said books of account shall be kept at
LICENSEE's principal place of business or the principal place of business of the
appropriate division of LICENSEE to which this Agreement relates. Said books and
the supporting data shall be open at all reasonable times for five (5) years
following the end of the calendar year to which they pertain, to the inspection
of M.I.T. or its agents for the purpose of verifying LICENSEE's royalty
statement or compliance in other respects with this Agreement. Should such
inspection lead to the discovery of a greater than Ten Percent (10%) discrepancy
in reporting to M.I.T.'s detriment, LICENSEE agrees to pay the full cost of such
inspection.

     5.2 LICENSEE shall deliver to M.I.T. true and accurate reports, giving
such particulars of the business conducted by LICENSEE and its sublicensees
under this Agreement as shall be pertinent to diligence under Article 3 and
royalty accounting hereunder:

     a.   before the first commercial sale of a LICENSED PRODUCT or LICENSED
          PROCESS, annually, on January 31 of each year; and

     b.   after the first commercial sale of a LICENSED PRODUCT or LICENSED
          PROCESS, quarterly, within sixty (60) days after March 31, June 30,
          September 30 and December 31, of each year.

     These reports shall include at least the following:

     a.   number of LICENSED PRODUCTS manufactured, leased and sold by and/or
          for LICENSEE and all sublicensees;

     b.   accounting for all LICENSED PROCESSES used or sold by and/or for
          LICENSEE and all sublicensees;

     c.   accounting for NET SALES, noting the deductions applicable as provided
          in Paragraph 1.5;

     d.   Running Royalties due under Paragraph 4.1(c);

     e.   royalties due on other payments from sublicensees under paragraph
          4.1(d);

     f.   total royalties due; and

     g.   names and addresses of all sublicensees of LICENSEE.

     5.3 With each such report submitted, LICENSEE shall pay to M.I.T. the
royalties due and payable under this Agreement. If no royalties shall be due,
LICENSEE shall so report.

                                      -6-
<PAGE>   9
     5.4 On or before the ninetieth (90th) day following the close of
LICENSEE's fiscal year, LICENSEE shall provide M.I.T. with LICENSEE's certified
financial statements for the preceding fiscal year including, at a minimum, a
balance sheet and an income statement.

     5.5 The amounts due under Articles 4 and 6 shall, if overdue, bear
interest until payment at a per annum rate           *            the prime
rate in effect at the Chase Manhattan Bank (N.A.) on the due date. The
payment of such interest shall not foreclose M.I.T. from exercising any other
rights it may have as a consequence of the lateness of any payment.

                             6 - PATENT PROSECUTION

     6.1 M.I.T. shall apply for, seek prompt issuance of, and maintain the
PATENT RIGHTS during the term of this Agreement. The filing, prosecution and
maintenance of all PATENT RIGHTS applications and patents shall be the primary
responsibility of M.I.T.; provided, however, LICENSEE shall have reasonable
opportunities to advise M.I.T. and shall cooperate with M.I.T. in such filing,
prosecution and maintenance.

     6.2  Payment of all fees and costs relating to the filing, prosecution and
maintenance of the PATENT RIGHTS after the EFFECTIVE DATE shall be the
responsibility of LICENSEE, whether such fees and costs were incurred before or
after the EFFECTIVE DATE. LICENSEE shall pay such fees and costs to M.I.T.
within thirty (30) days of invoicing; late payments shall accrue interest and
shall be subject to Paragraph 5.5.

                                7 - INFRINGEMENT

     7.1  LICENSEE shall inform M.I.T. promptly in writing of any alleged
infringement of the PATENT RIGHTS by a third party and of any available
evidence thereof.

     7.2  M.I.T. shall have the right, but shall not be obligated, to prosecute
at its own expense all infringements of the PATENT RIGHTS and, in furtherance
of such right, LICENSEE hereby agrees that M.I.T. may include LICENSEE as a
party plaintiff in any such suit, without expense to LICENSEE. The total cost of
any such infringement action commenced or defended solely by M.I.T. shall be
borne by M.I.T., and M.I.T. shall keep any recovery or damages for past
infringement derived therefrom.

     7.3  If within six (6) months after having been notified of an alleged
infringement, M.I.T. shall have been unsuccessful in persuading the alleged
infringer to desist and shall not have brought and shall not be diligently
prosecuting an infringement action, or if M.I.T. shall notify LICENSEE at any
time prior thereto of its intention not to bring suit against any alleged
infringer in the TERRITORY for the FIELDS OF USE, then, and in those events
only, LICENSEE shall have the right, but shall not be obligated, to prosecute
at its own expense any infringement of the PATENT RIGHTS in the TERRITORY for
the FIELDS OF USE, and LICENSEE may, for such


                                      -7-

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   10
purposes, use the name of M.I.T. as party plaintiff; provided, however, that
such right to bring such an infringement action shall remain in effect only
during the EXCLUSIVE PERIOD. No settlement, consent judgment or other voluntary
final disposition of the suit may be entered into without the consent of
M.I.T., which consent shall not unreasonably be withheld. LICENSEE shall
indemnify M.I.T. against any order for costs that may be made against M.I.T. in
such proceedings.

     7.4 In the event that LICENSEE shall undertake litigation for the
enforcement of the PATENT RIGHTS, or the defense of the PATENT RIGHTS under
Paragraph 7.5, LICENSEE may withhold up to        *            of the payments
otherwise thereafter due M.I.T. under Article 4 hereunder and apply the same
toward reimbursement of up to  *   of LICENSEE's expenses, including reasonable
attorneys' fees, in connection therewith. Any recovery of damages by LICENSEE
for such suit shall be applied first in satisfaction of any unreimbursed
expenses and legal fees of LICENSEE relating to such suit, and next toward
reimbursement of M.I.T. for any payments under Article 4 past due or withheld
and applied pursuant to this Article 7. The balance remaining from any such
recovery shall be divided equally between LICENSEE and M.I.T.

     7.5 In the event that a declaratory judgment action alleging invalidity or
noninfringement of any of the PATENT RIGHTS shall be brought against M.I.T. or
LICENSEE, M.I.T., at its option, shall have the right, within thirty (30) days
after commencement of such action, to take over the sole defense of the action
at its own expense. If M.I.T. shall not exercise this right, LICENSEE may take
over the sole defense at LICENSEE's sole expense, subject to Paragraph 7.4.

     7.6 In any infringement suit as either party may institute to enforce the
PATENT RIGHTS pursuant to this Agreement, the other party hereto shall, at the
request and expense of the party initiating such suit, cooperate in all respects
and, to the extent possible, have its employees testify when requested and make
available relevant records, papers, information, samples, specimens, and the
like.

     7.7 LICENSEE shall have the sole right in accordance with the terms and
conditions herein to sublicense any alleged infringer in the TERRITORY for the
FIELDS OF USE for future use of the PATENT RIGHTS.


                             8 - PRODUCT LIABILITY

     8.1 LICENSEE shall at all times during the term of this Agreement and
thereafter, indemnify, defend and hold M.I.T., its trustees, directors,
officers, employees and affiliates,


                                      -8-

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   11
harmless against all claims, proceedings, demands and liabilities of any kind
whatsoever, including legal expenses and reasonable attorneys' fees, arising out
of the death of or injury to any person or persons or out of any damage to
property, resulting from the production, manufacture, sale, use, lease,
consumption or advertisement of the LICENSED PRODUCTS(s) and/or LICENSED
PROCESS(es) or arising from any obligation of LICENSEE hereunder.

     8.2  LICENSEE shall obtain and carry in full force and effect commercial,
general liability insurance which shall protect LICENSEE and M.I.T. with
respect to events covered by Paragraph 8.1 above. Such insurance shall be
written by a reputable insurance company authorized to do business in the
Commonwealth of Massachusetts, shall list M.I.T. as an additional named insured
thereunder, shall be endorsed to include product liability coverage and shall
require thirty (30) days written notice to be given to M.I.T. prior to any
cancellation or material change thereof. The limits of such insurance shall not
be less than One Million Dollars ($1,000,000) per occurrence with an aggregate
of Three Million Dollars ($3,000,000) for personal injury or death, and One
Million Dollars ($1,000,000) per occurrence with an aggregate of Three Million
Dollars ($3,000,000) for property damage. LICENSEE shall provide M.I.T. with
Certificates of Insurance evidencing the same.

     8.3  EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN THIS AGREEMENT, M.I.T.,
ITS TRUSTEES, DIRECTORS, OFFICERS, EMPLOYEES, AND AFFILIATES MAKE NO
REPRESENTATIONS AND EXTEND NO WARRANTIES OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, VALIDITY OF PATENT RIGHTS CLAIMS, ISSUED OR PENDING,
AND THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER OR NOT DISCOVERABLE.
NOTHING IN THIS AGREEMENT SHALL BE CONSTRUED AS A REPRESENTATION MADE OR
WARRANTY GIVEN BY M.I.T. THAT THE PRACTICE BY LICENSEE OF THE LICENSE GRANTED
HEREUNDER SHALL NOT INFRINGE THE PATENT RIGHTS OF ANY THIRD PARTY. IN NO EVENT
SHALL M.I.T., ITS TRUSTEES, DIRECTORS, OFFICERS, EMPLOYEES AND AFFILIATES BE
LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND, INCLUDING ECONOMIC
DAMAGE OR INJURY TO PROPERTY AND LOST PROFITS, REGARDLESS OF WHETHER M.I.T.
SHALL BE ADVISED, SHALL HAVE OTHER REASON TO KNOW, OR IN FACT SHALL KNOW OF THE
POSSIBILITY OF THE FOREGOING.

                              9 - EXPORT CONTROLS

     LICENSEE acknowledges that it is subject to United States laws and
regulations controlling the export of technical data, computer software,
laboratory prototypes and other


                                      -9-
<PAGE>   12
commodities (including the Arms Export Control Act, as amended and the United
States Department of Commerce Export Administration Regulations). The transfer
of such items may require a license from the cognizant agency of the United
States Government and/or written assurances by LICENSEE that LICENSEE shall not
export data or commodities to certain foreign countries without prior approval
of such agency. M.I.T. neither represents that a license shall not be required
nor that, if required, it shall be issued.

                             10 - NON-USE OF NAMES

     LICENSEE shall not use the names or trademarks of the Massachusetts
Institute of Technology or Lincoln Laboratory, nor any adaptation thereof, nor
the names of any of their employees, in any advertising, promotional or sales
literature without prior written consent obtained from M.I.T., or said
employee, in each case, except that LICENSEE may state that it is licensed by
M.I.T. under one or more of the patents and/or applications comprising the
PATENT RIGHTS.

                               11 - ASSIGNMENT

     This Agreement is not assignable and any attempt to do so shall be void.

                           12 - DISPUTE RESOLUTION

     12.1  Except for the right of either party to apply to a court of
competent jurisdiction for a temporary restraining order, a preliminary
injunction, or other equitable relief to preserve the status quo or prevent
irreparable harm, any and all claims, disputes or controversies arising
under, out of, or in connection with the Agreement, including any dispute
relating to patent validity or infringement, which the parties shall be
unable to resolve within sixty (60) days shall be mediated in good faith. The
party raising such dispute shall promptly advise the other party of such
claim, dispute or controversy in a writing which describes in reasonable
detail the nature of such dispute. By not later than five (5) business days
after the recipient has received such notice of dispute, each party shall
have selected for itself a representative who shall have the authority to
bind such party, and shall additionally have advised the other party in
writing of the name and title of such representative. By not later than ten
(10) business days after the date of such notice of dispute, the party
against whom the dispute shall be raised shall select a mediation firm in the
Boston area and such representatives shall schedule a date with such firm for
a mediation hearing. The parties shall enter into good faith mediation and
shall share the costs equally. If the representatives of the parties have not
been able to resolve the dispute within fifteen (15) business days after such
mediation hearing, then any and all claims, disputes or controversies arising
under, out of, or in connection with this Agreement, including any dispute
relating to patent validity or infringement,

                                      -10-
<PAGE>   13
shall be resolved by final and binding arbitration in Boston, Massachusetts
under the rules of the American Arbitration Association, or the Patent
Arbitration Rules if applicable, then obtaining. The arbitrators shall have no
power to add to, subtract from or modify any of the terms or conditions of this
Agreement, nor to award punitive damages. Any award rendered in such
arbitration may be enforced by either party in either the courts of the
Commonwealth of Massachusetts or in the United States District Court for the
District of Massachusetts, to whose jurisdiction for such purposes M.I.T. and
LICENSEE each hereby irrevocably consents and submits.

     12.2  Notwithstanding the foregoing, nothing in this Article shall be
construed to waive any rights or timely performance of any obligations existing
under this Agreement.

                                13 - TERMINATION

     13.1  If LICENSEE shall cease to carry on its business, this Agreement
shall terminate upon notice by M.I.T.

     13.2  Should LICENSEE fail to make any payment whatsoever due and payable
to M.I.T. hereunder, M.I.T. shall have the right to terminate this Agreement
effective on thirty (30) days' notice, unless LICENSEE shall make all such
payments to M.I.T. within said thirty (30) day period. Upon the expiration of
the thirty (30) day period, if LICENSEE shall not have made all such payments
to M.I.T., the rights, privileges and license granted hereunder shall
automatically terminate.

     13.3  Upon any material breach or default of this Agreement by LICENSEE
(including, but not limited to, breach or default under Paragraph 3.3), other
than those occurrences set out in Paragraphs 13.1 and 13.2 hereinabove, which
shall always take precedence in that order over any material breach or default
referred to in this Paragraph 13.3, M.I.T. shall have the right to terminate
this Agreement and the rights, privileges and license granted hereunder
effective on ninety (90) days' notice to LICENSEE. Such termination shall become
automatically effective unless LICENSEE shall have cured any such material
breach or default prior to the expiration of the ninety (90) day period.

     13.4  LICENSEE shall have the right to terminate this Agreement at any
time on six (6) months' notice to M.I.T., and upon payment of all amounts due
M.I.T. through the effective date of the termination.

     13.5  Upon termination of this Agreement for any reason, nothing herein
shall be construed to release either party from any obligation that matured
prior to the effective date of such termination; and Articles
1,8,9,10,12,13.5,13.6 and 15 shall survive any such termination. LICENSEE and
any sublicensee thereof may, however, after the effective date of such
termination, sell all LICENSED PRODUCTS, and complete LICENSED PRODUCTS in the
process of manufacture at the time of such termination and sell the same,
provided that LICENSEE shall make

                                      -11-


<PAGE>   14
the payments to M.I.T. as required by Article 4 of this Agreement and shall
submit the reports required by Article 5 hereof.

     13.6  Upon termination of this Agreement for any reason, any sublicensee
not then in default shall have the right to seek a license from M.I.T. M.I.T.
agrees to negotiate such licenses in good faith under reasonable terms and
conditions.

                14 - PAYMENTS, NOTICES AND OTHER COMMUNICATIONS

     Any payments, notice or other communication pursuant to this Agreement
shall be sufficiently made or given on the date of mailing if sent to such party
by certified first class mail, return receipt requested, postage prepaid,
addressed to it at its address below or as it shall designate by written notice
given to the other party:

          In the case of M.I.T.:

          Director
          Technology Licensing Office
          Massachusetts Institute of Technology
          77 Massachusetts Avenue, Room E32-300
          Cambridge, Massachusetts 02139

          In the case of LICENSEE:





                         15 - MISCELLANEOUS PROVISIONS

     15.1  All disputes arising out of or related to this Agreement, or the
performance, enforcement, breach or termination hereof, and any remedies
relating thereto, shall be construed, governed, interpreted and applied in
accordance with the laws of the Commonwealth of Massachusetts, U.S.A., except
that questions affecting the construction and effect of any patent shall be
determined by the law of the country in which the patent shall have been
granted.

     15.2  The parties hereto acknowledge that this Agreement sets forth the
entire Agreement and understanding of the parties hereto as to the subject
matter hereof, and shall not be subject to any change or modification except by
the execution of a written instrument signed by the parties.

     15.3  The provisions of this Agreement are severable, and in the event
that any provisions of this Agreement shall be determined to be invalid or
unenforceable under any controlling body of the law, such invalidity or
unenforceability shall not in any way affect the validity or enforceability of
the remaining provisions hereof.

     15.4  LICENSEE agrees to mark the LICENSED PRODUCTS sold in the United
States with all applicable United States patent numbers. ALL LICENSED PRODUCTS
shipped to or sold

                                      -12-
<PAGE>   15
in other countries shall be marked in such a manner as to conform with the
patent laws and practice of the country of manufacture or sale.

     15.5  The failure of either party to assert a right hereunder or to insist
upon compliance with any term or condition of this Agreement shall not
constitute a waiver of that right or excuse a similar subsequent failure to
perform any such term or condition by the other party.

     IN WITNESS WHEREOF, the parties have duly executed this Agreement the day
and year set forth below.

MASSACHUSETTS INSTITUTE OF TECHNOLOGY    SANGAMO BIOSCIENCES, INC.

By /s/ Lita Nelsen                       By /s/ Edward O. Lanphier
  -------------------------------          -----------------------------
Name LITA L. NELSEN, DIRECTOR            Name EDWARD LANPHIER
    -----------------------------            ---------------------------
Title TECHNOLOGY LICENSING OFFICE        Title PRESIDENT
     ----------------------------             ---------------------------
Date April 17, 1996                      Date May 9, 1996
    -----------------------------            ---------------------------

                                      -13-
<PAGE>   16
                                FIRST AMENDMENT

This Amendment, with the effective date of 12/10/97, is to the License
Agreement dated May 9, 1996, between Sangamo Biosciences, Inc. and
Massachusetts Institute of Technology.

The parties thereto now further agree as follows:

1. Paragraph 1.7 shall be deleted, including the "Note", and replaced with the
following:

     1.7  "FIELDS OF USE" shall mean all fields of use.

2. Paragraph 2.4 shall be deleted and replaced with:

     2.4  LICENSEE and M.I.T. agree that neither party shall assert the Patent
     Rights against not-for-profit institutions in their conduct of research,
     provided, however, that if a not-for-profit institution practices under the
     Patent Rights to conduct high throughput drug screening on behalf of a
     commercial entity, then the Patent Rights may be asserted against that
     institution.

3. The following shall be inserted as Paragraph 3.4:

     3.4  After January 1, 2002, if M.I.T. notifies LICENSEE of a request by a
     third party for a license to the Patent Rights for an application or
     product (such as drug screening for a particular disease state, or
     development of a Licensed Product for a particular disease state) not
     currently under development by LICENSEE (or its sublicensee), and no such
     application or product (nor any directly competing application or product)
     is then currently under development or being sold by LICENSEE or a
     sublicensee, then LICENSEE shall either:

          (a)  within three months of the request submit to M.I.T. plans to
          begin development of the application or product within six months of
          the original request, at a level of effort appropriate to success of
          the development in a commercially reasonable time; or

          (b)  begin good faith negotiations with the third party toward
          granting a sublicense to the Patent Rights for the application
          or product.

     If LICENSEE does not begin (or abandons) efforts under (a) above, and does
     not reach a sublicense agreement with the third party within 6 months
     thereafter, M.I.T. shall have the right to grant a nonexclusive license to
     the Patent Rights to the third party for the particular application or
     product, under terms no more favorable to the third party than are granted
     hereunder to LICENSEE, and including diligent development milestones.
     M.I.T. shall share with LICENSEE two-thirds (66.7%) of any revenue it
     derives from such license.

4. Royalties:


<PAGE>   17
(a) LICENSEE shall pay to M.I.T. a First Amendment Issue Fee of
              *                due upon              *              .

(b) The License Maintenance Fees due under P. 4.1b shall be increased to
*              on January 1, 1998 and               *               per year
beginning January 1, 1999 and beyond.

(c) Subparagraphs 4.1e and 4.1g shall be deleted.

(d) The sublicense fees of P. 4.1h shall be increased to            * per
sublicense granted plus               *               per year per sublicense.

(e) The following subparagraph shall be added to P. 4.1, and shall be designated
as subparagraph P. 4.1i

     4.1i:       *        OF ANY MILESTONE FEES OR ROYALTIES PAID TO LICENSEE
FROM SUBLICENSEES OR OTHER THIRD PARTIES FOR PRODUCTS DISCOVERED OR DEVELOPED
THROUGH THE USE OF LICENSED PRODUCTS OR LICENSED PROCESSES. HOWEVER, IF THESE
MILESTONE FEES AND ROYALTIES ARE ON PRODUCTS WHOSE COMPOSITION AND/OR PRODUCTION
ARE COVERED BY OTHER PATENTS OWNED OR CONTROLLED BY LICENSEE, AND IF THESE FEES
AND ROYALTIES ARE ALSO INTENDED TO COMPRISE COMPENSATION FOR PRACTICE UNDER SUCH
LICENSEE PATENTS, THEN THE PAYMENTS DUE TO M.I.T. SHALL BE          * OF THE
MILESTONE FEES AND ROYALTIES.

Agreed to for:

MASSACHUSETTS INSTITUTE OF TECHNOLOGY    SANGAMO BIOSCIENCES, INC.

By /s/ Lita Nelsen                       By /s/ Edward O. Lanphier
  -------------------------------          -----------------------------
Name LITA L. NELSEN, DIRECTOR            Name EDWARD LANPHIER
    -----------------------------            ---------------------------
Title  TECHNOLOGY LICENSING OFFICE       Title PRESIDENT & CEO
     ----------------------------             ---------------------------
Date Dec 1, 1997                         Date  12/10/97
    -----------------------------            ---------------------------


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.


<PAGE>   1

                                                                   EXHIBIT 10.13

                               LICENSE AGREEMENT

     This Agreement, made and entered into as of this 29th day of June 1995
(the "Effective Date") by and between THE JOHNS HOPKINS UNIVERSITY, a
corporation duly organized and existing under the laws of the State of Maryland
and having its principal place of business at Charles and 34th Streets,
Baltimore, Maryland 21218, U.S.A. (hereinafter referred to as "JOHNS HOPKINS")
and SANGAMO BIOSCIENCES, INC. a corporation duly organized under the laws of
Delaware and having its principal office at P.O. Box 334, Ross, California
94957 (hereinafter referred to as "LICENSEE").

                                   WITNESSETH

     WHEREAS, JOHNS HOPKINS is the owner of certain Patent Rights (as later
defined herein) relating to inventions from its laboratories directed by
Srinivasan Chandrasegaran, Ph.D. concerning custom design and development of
novel DNA-binding proteins for uses, including but not limited to laboratory
reagents, clinical diagnostics and therapeutics and has the right to grant
licenses under said Patent Rights, subject only to certain march-in-rights
retained by the United States Government, including royalty-free, nonexclusive
licenses;

     WHEREAS, JOHNS HOPKINS desires to have the Patent Rights utilized in the
public interest and is willing to grant a license thereunder;

     WHEREAS, JOHNS HOPKINS and LICENSEE are parties to a Research Agreement
having even date herewith (Appendix D);

     WHEREAS, JOHNS HOPKINS is acting herein for itself;

     WHEREAS, LICENSEE has represented JOHNS HOPKINS to induce JOHNS

                                       1
<PAGE>   2
HOPKINS to enter into this Agreement that LICENSEE shall commit itself to a
thorough, vigorous and diligent program of exploiting the Patent Rights so that
public utilization shall result therefrom;

     WHEREAS, Dr. Chandrasegaran will continue to have full academic freedom to
continue his scientific investigations and interactions with his colleagues; and

     WHEREAS, LICENSEE desires to obtain a license under the Patent Rights upon
the terms and conditions hereinafter set forth.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein, the parties hereto agree as follows:

                            ARTICLE I - DEFINITIONS

     For the purposes of this Agreement, in addition to other terms defined
herein, the following words and phrases shall have the following meanings:

     1.1  "LICENSEE" shall mean SANGAMO BIOSCIENCES and any Subsidiary of
SANGAMO BIOSCIENCES.

     1.2  "Subsidiary" shall mean any corporation, company or other entity more
than fifty percent (50%) of whose voting stock is owned or controlled directly
or indirectly by SANGAMO BIOSCIENCES; any parent corporation, company or other
entity which owns, directly or indirectly, more than fifty percent (50%) of the
voting stock of SANGAMO BIOSCIENCES; and any corporation, company or other
entity in which such parent corporation, company or other entity owns, directly
or indirectly, more than fifty percent (50%) of the voting stock.

     1.3  "Patent Rights" shall mean the inventions disclosed and claimed in
the United States and foreign patents and/or patent applications listed in
Appendix A.

                                       2
<PAGE>   3
     1.4  A "Licensed Product" shall mean any product or part thereof which:

          (a)  is covered in whole or in part by an issued, valid, enforceable,
               unexpired claim or a pending claim contained in the Patent Rights
               in the country in which any Licensed Product is made, used or
               sold;

          (b)  is manufactured by using a process which is covered in whole or
               in part by a valid, enforceable, issued, unexpired claim or a
               pending claim contained in the Patent Rights in the country in
               which any Licensed Process is used or in which the Licensed
               Product is used or sold.

     1.5  A "Licensed Process" shall mean any process which is covered in whole
or in part by a valid, enforceable, issued, unexpired claim or a pending claim
contained in the Patent Rights.

     1.6  "Net Sales" shall mean the invoiced sales price of Licensed Products
to an end-user that is not a Subsidiary or a sublicensee in a country in which
such sales would infringe a valid claim contained in the Patent Rights in such
country after deducting:

          (a)  Discounts allowed in amounts customary in the trade;

          (b)  Sales taxes, tariffs, duties, use taxes and/or other
               governmental levies directly imposed and with reference to
               particular sales;

          (c)  Outbound transportation prepaid or allowed; and

          (d)  Amounts allowed or credited on returns.

No deductions shall be made for commissions paid to individuals whether they be
with independent sales agencies or regularly employed by LICENSEE and on its
payroll, or for cost of collections. Licensed Products shall be considered
"sold" when billed out or invoiced.

                                       3
<PAGE>   4
     1.7  "Invention" shall mean custom designed novel DNA-binding proteins.

                               ARTICLE II - GRANT

     2.1  JOHNS HOPKINS hereby grants to LICENSEE the exclusive worldwide right
and license to make, have made, use, lease and sell the Licensed Products, and
to practice the Licensed Processes, including the right to grant sublicenses,
subject to 35USC200-211 and the regulations promulgated thereunder, to the end
of the term for which the Patent Rights are granted by the applicable
governmental authority, unless sooner terminated as hereinafter provided (the
"Term"). JOHNS HOPKINS reserves the non-transferable royalty-free right to
practice the subject matter of any claim within the Patent Rights for its own
internal purposes. If Dr. Chandrasegaran leaves JOHNS HOPKINS, he shall have
the non-transferable, royalty-free right to practice any claim within the
Patent Rights for his own academic purposes.

     2.2  In order to establish a period of exclusivity for LICENSEE, JOHNS
HOPKINS hereby agrees that it shall not grant any other license to make, have
made, use, lease or sell Licensed Products or to practice Licensed Processes
except for its internal research activities during the period of time (the
"Exclusive Period") commencing with the Effective Date of this Agreement and
terminating with expiration of the last-to-expire patent licensed under this
Agreement, unless converted earlier to a nonexclusive license pursuant to
Paragraph 4.4 hereof or pursuant to a requirement by the United States
Government in accordance with 35USC200-211.

     2.3  LICENSEE shall have the right to sublicense all or any part of this
license. LICENSEE agrees that any sublicenses granted by it shall provide that
the obligations to JOHNS HOPKINS of Articles II, VIII, IX, X, XIII, XV, and
Paragraphs 5.1 and 5.2 of this

                                       4
<PAGE>   5
Agreement shall be binding upon the sublicensees as if it were a party to this
Agreement. LICENSEE further agrees to attach copies of these Articles to
sublicense agreements.

     2.4  LICENSEE agrees to forward to JOHNS HOPKINS a copy of any and all
fully executed sublicense agreements, and further agrees to forward to JOHNS
HOPKINS, quarterly, pursuant to Paragraph 5.2 a copy of such reports received
by LICENSEE from its sublicensees during the preceding twelve (12) month period
under the sublicense as shall be pertinent to a royalty accounting under said
sublicense agreements.

     2.5  Subject to Sections 2.6, 2.7 and 15.7 below, the license granted
hereunder shall not be construed to confer any rights upon LICENSEE by
implication, estoppel or otherwise as to any technology not specifically set
forth in Appendix A, Appendix B, Appendix C, and Appendix D hereof.

     2.6  JOHNS HOPKINS hereby also grants to LICENSEE a right of first
negotiation at then commercially reasonable terms, to obtain an exclusive
license to any Inventions, as previously defined, developed during the term of
this Agreement and any extension thereof and pursuant to any Research Agreement
between the parties hereto (Appendix D). JOHNS HOPKINS shall promptly give
LICENSEE written notice of any such Inventions, as defined, and LICENSEE shall
have one hundred and twenty (120) days from the date of receipt of such notice
to give JOHNS HOPKINS written notice of its intent to exercise such option and
complete negotiations. JOHNS HOPKINS shall not negotiate with any third party
regarding these Inventions during the period of LICENSEE's right to negotiate.
During the term of this Agreement and any extension thereof, Dr. Chandrasegaran
shall be free to pursue any scientific investigations of his choice through
collaboration with colleagues. Should any such collaboration involve a Licensed
Product or Licensed Process, JOHNS HOPKINS will take the initiative of promptly
communicating


                                       5
<PAGE>   6
with these colleagues for the purpose of using its reasonable best efforts to
have such colleagues agree to be bound by the terms of this Agreement with
regard to Licensed Products and Licensed Processes.

     2.7  Appendix B attached hereto contains ideas conceived by Dr.
Chandrasegaran for developing laboratory reagents, diagnostics, and
pharmaceuticals relating to chimeric restriction endonucleases. Dr.
Chandrasegaran shall give written notice of any Invention resulting under the
Advanced Technology Program within sixty (60) days of the completion of the
funding of such program. Any Invention resulting in whole or in part from said
ideas which are made pursuant to an award under the Advanced Technology Program
where a grant application was filed on March 29, 1995 (Appendix C) shall be
assigned to LICENSEE pursuant to Section 15.7 below and Dr. Chandrasegaran will
be named as sole inventor unless another individual makes a creative input to
said Invention. LICENSEE shall have the first right of negotiation, under then
commercially reasonable terms, to obtain an exclusive, royalty-bearing license
under any Invention resulting from said ideas in Appendix B made by Dr.
Chandrasegaran with funding from a source other than the Advanced Technology
Program grant.

                          ARTICLE III - DUE DILIGENCE

     3.1  In order to assure the diligent development of the Licensed Products
and Licensed Processes, LICENSEE shall either fulfill the due diligence
milestones set forth in Paragraph 3.2 below or make the minimum royalty
payments set forth in Paragraph 3.3 below.

     3.2  LICENSEE's due diligence milestones shall be a follows:

          (a)  Within six (6) months from the date of this Agreement, LICENSEE
               shall deliver a business plan describing a program for the
               development of the Patent Rights.


                                       6
<PAGE>   7
          (b)  Within four (4) years from the Effective Date of this Agreement,
               LICENSEE shall have spent or caused to be spent, either directly
               by LICENSEE or indirectly pursuant to agreements entered into by
               LICENSEE (including Research Agreement funding and grant funding
               provided by or associated with LICENSEE to JOHNS HOPKINS), a
               total of One Million Dollars ($1,000,000) on activities relating
               to the research and development, marketing, sale, manufacture,
               lease and use of Licensed Products and Licensed Processes. All
               amounts expended on Licensed Products and Licensed Processes
               shall be credited toward the above indicated amounts, including
               but not limited to salaries, overhead salaries, overhead,
               capital, equipment, consulting fees and cost of materials.

          (c)  Within four (4) years from the Effective Date of this Agreement,
               LICENSEE shall submit an Experimental Plan for, and begin
               experimental work on, an appropriate testing program for at least
               one (1) Licensed Product. Such Experimental Plan shall be
               sufficiently detailed and comprehensive that, in the good faith
               opinion of LICENSEE and its counselors, the Plan shall, if
               successful, be reasonably adequate to support a credible and
               potentially successful Investigative New Drug (IND) application
               to the U.S. Food and Drug Administration within seven (7) years
               from the Effective Date of this Agreement.

          (d)  Within seven (7) years of the Effective Date of this Agreement,
               LICENSEE shall have submitted a complete Investigative New Drug
               application to the U.S. FDA, such IND to be supported with
               appropriate studies and other toxicity and safety tests as may be
               required by the FDA.

          (e)  Within three (3) years of the Effective Date of this Agreement,
               LICENSEE shall have made a first commercial sale of at least one
               (1) Licensed Product.

     3.3  In the event that LICENSEE has failed to meet any particular due
diligence milestone set forth in Paragraph 3.2 above on or before the date set
forth therein with respect to each such milestone, JOHNS HOPKINS shall notify
LICENSEE thereof and LICENSEE shall have ninety (90) days following such
notification either to establish to the

                                       7

<PAGE>   8


reasonable satisfaction of JOHNS HOPKINS that it has met such milestone or to
make the initial penalty payment referred to in Paragraph 3.4 below.

     3.4  In the event that LICENSEE shall have failed to establish its
achievement of any particular milestone to the reasonable satisfaction of JOHNS
HOPKINS as set forth in Paragraph 3.3 above, JOHNS HOPKINS shall have the right
to terminate this Agreement, unless LICENSEE shall make to JOHNS HOPKINS the
following penalty payments:

          (a)  To maintain the exclusive rights granted herein on an exclusive
               basis as set forth in Paragraph 2.2, the amount of      *
                                 in the year of the breach and       *
                                 annually thereafter until the breach is cured;
               with such amount increasing to               *
                          annually commencing the eighth year following the
               Effective Date of this Agreement.

          (b)  To maintain its rights granted herein without the exclusivity
               provisions of Paragraph 2.2, the sum of          *
                                 in the year of the breach and       *
                                          per year thereafter until cured.

     The penalty payments described in (a) and (b) above shall only be due
within thirty (30) days following the failure of LICENSEE to achieve a
milestone or cure such failure within the ninety (90) days set forth in
Paragraph 3.3 above. LICENSEE's obligation to make such penalty payments shall
terminate when the applicable milestone has been met.

                             ARTICLE IV - ROYALTIES

     4.1  For the rights, privileges and license granted hereunder, LICENSEE
shall pay to JOHNS HOPKINS in the manner hereinafter provided for so long as
LICENSEE by its activities would, but for the licenses granted herein, infringe
a valid, enforceable claim of an unexpired Patent Right or until this Agreement
shall be terminated as hereinafter

                                       8

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   9
provided:

          (a)  At the time that LICENSEE closes financing equal to a total
               cumulative equity investment of at least Five Hundred Thousand
               Dollars ($500,000) ("Initial Financing"), LICENSEE shall issue to
               JOHNS HOPKINS that number of common units equal to that portion
               of the total number of common and preferred units issued with
               respect to the first Five Hundred Thousand Dollars ($500,000) in
               equity capital invested in the LICENSEE multiplied by 0.075. If
               the preferred units issued in any financing have antidilution
               protection, JOHNS HOPKINS shall be entitled to equivalent
               protection for its common units. JOHNS HOPKINS shall also be
               entitled, at its sole option, to invest its own funds in the
               second and any subsequent round of investment funding at a price
               per unit which is the same price as is offered to other second
               round investors, for up to a total number of shares such that
               JOHNS HOPKINS' share of equity in the Company would remain at
               seven-and-one-half percent (7.5%).

          (b)  At the time that the cumulative equity capital invested in the
               Company is equal to Two Million Dollars ($2,000,000), LICENSEE
               shall pay to JOHNS HOPKINS:

               (i)  a License Issue Fee of                *
                                  *                 of said License Issue Fee
                    shall be considered an Administrative Signing Fee); and

               (ii) shall commence annual maintenance fees of        *
                            *        due on January 1 of each year following the
                    financing date.

          (c)  LICENSEE shall also pay to JOHNS HOPKINS a running royalty on
               Licensed Products during the Exclusive Period for such products
               as follows:

               (i)  For sales by LICENSEE and it Subsidiaries:

                    (1)  for reagent products,               *
                                    *          of Net Sales;        *
                                              *               of Net Sales; and
                                                 *


                                       9


* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   10
                             *     ;

                    (2)  for diagnostic products,        *        of Net Sales;
                              *        of Net Sales; and        *
                              *   of Net Sales in excess of    *
                              *   ; and

                    (3)  for therapeutic products,           *
                            *  of Net Sales;       *     of Net Sales; and
                            *  of Net Sales in excess of     *
                            *  .

               (ii) for sales by sublicensees:

                    (1)  for reagents products, the greater of  *  of Net Sales
                         or       *            sublicense royalties received by
                         LICENSEE;

                    (2)  for diagnostic products, the greater of  *   of Net
                         Sales or    *        of          *        sublicense
                         royalties received by LICENSEE; and

                    (3)  for therapeutic products, the greater of    *    of Net
                         Sales or       *       of sublicense royalties received
                         by LICENSEE.

          (d)  LICENSEE shall pay to JOHNS HOPKINS  *  of initial License Fees
               (excluding all other forms of payment including, but not limited
               to, research funding) LICENSEE receives from all sublicensees.

          (e)  During the nonexclusive period for any Licensed Product, LICENSEE
               shall pay to JOHNS HOPKINS a running royalty on the Net Sales of
               such Licensed Products sold by LICENSEE, its Subsidiaries and its
               sublicensees equal to    *       the royalty set forth in (c)
               above for sales during the Exclusive Period.

     4.2  No multiple royalties shall be payable because any Licensed Product,
its

                                       10

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  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   11
manufacture, lease or sale are or shall be covered by more than one patent
application or patent licensed under this Agreement or acquired under a license
pursuant to Paragraph 2.6 or 2.7. If a Licensed Product is covered by this
Agreement and a License Agreement pursuant to Paragraph 2.6 and/or 2.7 the
highest applicable royalty rate will apply. If, as to any Licensed Product,
LICENSEE is required to pay a royalty to any third party, the royalty rates set
forth in Paragraph 4.1 shall be reduced by        *       of the royalty rates
paid to the third party, but in no event shall the rates in Paragraph 4.1 be
reduced by more than          *         .

     4.3  Royalty payments shall be paid in United States dollars in Baltimore,
Maryland, at the time and in the manner provided in Article V below. If any
currency conversion shall be required in connection with the payment of
royalties hereunder, such conversion shall be made by using the exchange rate
prevailing at the Bank of America Corporation on the last business day of the
calendar quarterly reporting period to which such royalty payments relate.

     4.4  At the end of the first calendar year beginning after the first
commercial sale of a Licensed Product by LICENSEE, a subsidiary, or a
     *     , and each calendar year thereafter (hereinafter "Royalty Year"),
LICENSEE shall pay JOHNS HOPKINS the greater of royalties payable pursuant to
Paragraph 4.1(c) or a minimum annual royalty according to the following
schedule:

  At the End of the First Royalty Year  -               *

  At the End of the Second Royalty Year -               *

  At the End of the Third and Through
  the Ninth Royalty Year                -               *

  At the End of the Tenth and Each
  Subsequent Royalty Years              -               *


Said minimum annual royalty shall be paid to JOHNS HOPKINS within thirty (30)
days of

                                       11

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  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   12
the end of each Royalty Year. Failure by LICENSEE to pay the minimum annual
royalty required by this Paragraph 4.4 shall give JOHNS HOPKINS the right to
convert the exclusive license granted by this Agreement to a nonexclusive
license.

                        ARTICLE V - REPORTS AND RECORDS

     5.1  LICENSEE shall keep full, true and accurate books of account
containing all particulars that may be necessary for the purpose of showing the
amounts payable to JOHNS HOPKINS hereunder. Said books of account shall be kept
at LICENSEE's principal place of business or the principal place of business of
the appropriate Division of LICENSEE to which this Agreement relates. Said
books and the supporting data shall be open at all reasonable times for five
(5) years following the end of the calendar year to which they pertain, to the
inspection of JOHNS HOPKINS or its agents for the purpose of verifying
LICENSEE's royalty statement or compliance in other respects with this
Agreement.

     5.2  Commencing with the first commercial sale of a Licensed Product,
LICENSEE, within sixty (60) days after March 31, June 30, September 30 and
December 31, of each year, shall deliver to JOHNS HOPKINS true and accurate
reports, giving such particulars of the business conducted by LICENSEE, its
Subsidiaries and its sublicensees during the preceding three-month period under
this Agreement as shall be pertinent to a royalty accounting hereunder. These
shall include at least the following:

          (a)  All Licensed Products manufactured and sold.

          (b)  Total billings for Licensed Products sold.

          (c)  Accounting for all Licensed Processes used or sold.


                                       12

<PAGE>   13
               (d)  Deductions applicable as provided in Paragraph 1.6.

               (e)  Total royalties due.

               (f)  Names and addresses of all sublicensees of LICENSEE.

Where reasonably practical, LICENSEE shall, to the best of its knowledge,
subcategorize the Licensed Products sold so as to assign the royalties paid to
individual patent(s) of Appendix A. Such subcategorization shall be for JOHNS
HOPKINS administrative purposes only and shall in no way affect any obligations
of any part or the amounts of royalties to be paid under this Agreement. Until
there has been a first commercial sale of a Licensed Product, the LICENSEE
shall give an annual report of LICENSEE's efforts to achieve a first commercial
sale.

     5.3  With each such report submitted, LICENSEE shall pay to JOHNS HOPKINS
the royalties due and payable under this Agreement. If no royalties shall be
due, LICENSEE shall so report.

     5.4  The royalty payments set forth in this Agreement shall, if overdue,
bear interest until payment at a per annum rate           *            the
prime rate in effect at Bank of America on the due date. The payment of such
interest shall not foreclose JOHNS HOPKINS from exercising any other rights it
may have as a consequence of the lateness of any payments.

                        ARTICLE VI - PATENT PROSECUTION

     6.1  JOHNS HOPKINS represents that Appendix A, as amended from
time-to-time, contains an accurate and complete listing of the patent
applications and issued patents included within the Patent Rights. JOHNS
HOPKINS agrees to promptly amend Appendix A within thirty (30) days of any new
Invention made pursuant to the ATP.


                                       13

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   14
     6.2  JOHNS HOPKINS warrants that it has the right to grant the rights and
licenses granted herein to LICENSEE free and clear of all liens and
encumbrances, except to the extent set forth in Article XII.

     6.3  Within ninety (90) days of the completion of the financing set forth
in Paragraph 4.1(b), LICENSEE shall reimburse JOHNS HOPKINS for
previously-incurred as well as future expenses paid to third parties relating
to drafting, filing, prosecuting and maintaining U.S. and foreign patent
applications and patents included in the Patent Rights; provided, however, if
such reimbursement amount exceeds Fifty Thousand Dollars ($50,000), then the
amount above $50,000 shall be due twenty-four (24) months from the date of the
initial payment, JOHNS HOPKINS shall, on LICENSEE's request and expense, file,
prosecute, and maintain appropriate additional foreign patent applications and
patents directed to the inventions which will be included in the Patent Rights
and LICENSEE shall be licensed thereunder. If LICENSEE elects not to pay
expenses associated with filing, prosecuting, and maintaining U.S. and foreign
patent applications and patents directed to the inventions, JOHNS HOPKINS may
file, prosecute, and maintain such U.S. and foreign patent applications and
patents at its own expense and LICENSEE shall not be licensed thereunder.

     6.4  With regard to substantive correspondence, patent applications and
patents included in the Patent Rights, JOHNS HOPKINS shall in a timely manner
send LICENSEE (a) copies of all proposed patent applications and correspondence
to the respective patent office, give LICENSEE an opportunity to comment
thereon, and incorporate such changes as reasonably requested by LICENSEE; and
(b) copies of correspondence from the patent office.

     6.5  JOHNS HOPKINS shall reasonably respond to LICENSEE's request for

                                       14

<PAGE>   15
change in outside patent counsel.

                           ARTICLE VII - INFRINGEMENT

     7.1  Each party to this Agreement shall promptly notify the other party in
writing of any alleged infringement and of any available evidence of
infringement by a third party of any patents within the Patent Rights of which
it becomes aware.

     7.2  During the term of this Agreement, LICENSEE shall have the right, but
shall not be obligated, to prosecute at its own expense any such infringements
of the Patent Rights and, in furtherance of such right, LICENSEE hereby agrees
that JOHNS HOPKINS may join LICENSEE as a party plaintiff in any such suit,
without expense to JOHNS HOPKINS, provided, however, that such right to bring
an infringement action shall remain in effect only for so long as the license
granted herein remains exclusive. No settlement, consent judgment or other
voluntary final disposition of the suit may be entered into without the consent
of JOHNS HOPKINS, which consent shall not unreasonably be withheld. LICENSEE
shall indemnify JOHNS HOPKINS against any order for costs or other expenses
that may be made against JOHNS HOPKINS in such proceedings. The total cost of
any such infringement action commenced or defended solely by LICENSEE shall be
borne by LICENSEE, and LICENSEE shall keep any recovery damages for past
infringement derived therefrom, after payments to JOHNS HOPKINS of the royalty
rate set forth in Paragraph 4.1(c)(i) applied to the sum of the recovery,
damages or any other amount received in any form of disputation and/or in
settlement of any infringement or alleged infringement of the Patent Rights
remaining after LICENSEE has reimbursed itself for all costs, including legal
costs, associated with the prosecution.

     7.3  If within six (6) months after having been notified of any alleged
infringement,


                                       15

<PAGE>   16
LICENSEE shall have been unsuccessful in persuading the alleged infringer to
desist and shall not have brought and shall not be diligently prosecuting any
infringement action, or if LICENSEE shall notify JOHNS HOPKINS at any time
prior thereto of its intention not to bring suit against any alleged
infringer, then, JOHNS HOPKINS shall have the right, but shall not be obligated
to prosecute at its own expense any infringement of the Patent Rights, and
JOHNS HOPKINS may, for such purposes, use the name of LICENSEE as party
plaintiff without expense to LICENSEE, and JOHNS HOPKINS shall keep any
recovery or damages derived therefrom.

     7.4  In the event that a declaratory judgment action alleging invalidity
or noninfringement of any of the Patent Rights shall be brought against
LICENSEE, JOHNS HOPKINS at its option, shall have the right, within thirty (30)
days after commencement of such action, to intervene and participate in the
defense of the action at their own expense.

     7.5  In any infringement suit that any party hereto may institute to
enforce the Patent Rights pursuant to this Agreement, the other party hereto
shall, at the request and expense of the party initiating such suit, cooperate
in all respects and, to the extent possible, have its employees testify when
requested and make available relevant records, papers, information, samples,
specimens, and the like.

     7.6  LICENSEE, during the Exclusive Period of this Agreement, shall have
the sole right in accordance with the terms and conditions herein to sublicense
any alleged infringer under the Patent Rights to avoid future infringements.
Amounts received from any such sublicensee constituting retroactive royalties
shall be considered amounts received in settlement and accounted for under
Paragraph 7.2 above. Otherwise, amounts received from such sublicensee shall be
treated in accordance with Paragraph





                                       16

<PAGE>   17
4.1(c) above.

                            ARTICLE VIII - LIABILITY

     8.1  Inasmuch as JOHNS HOPKINS will not, under the provisions of this
Agreement or otherwise, have control over the manner in which LICENSEE, or its
Subsidiaries or its agents or its sublicensees or those operating for its
account, or third parties who purchase Licensed Products from any of the
foregoing entities, practice any invention encompassed by the license granted
herein, LICENSEE shall defend and hold JOHNS HOPKINS, it trustees, officers,
employees, students, and affiliates harmless as against any judgments, fees,
expenses or other costs (including reasonable attorneys' fees) arising from or
incidental to any product liability or other lawsuit brought as a consequence
of the practice of said invention by any of the foregoing entities, whether or
not JOHNS HOPKINS is named as party defendant in any such lawsuit. LICENSEE
shall have the right to defend such a product liability lawsuit with counsel of
its own choosing and JOHNS HOPKINS will cooperate in the defense of such action
at LICENSEE's expense. Practice of the Invention encompassed by the license
granted herein by a Subsidiary or an agent or a sublicensee, or a third party
on behalf of or for the account of LICENSEE or by a third party who purchases
Licensed Products from any of the foregoing shall be considered LICENSEE's
practice of said invention for purposes of this Paragraph 8.1. The provisions
of this Paragraph 8.1 shall survive termination of this Agreement.

     8.2  LICENSEE shall maintain or cause to be maintained, prior to the first
planned use of Licensed Products or Licensed Processes in humans, product
liability insurance or other protection reasonably acceptable to JOHNS HOPKINS
which shall


                                       17




<PAGE>   18
protect LICENSEE and JOHNS HOPKINS in regard to events covered by Paragraph 8.1
above. LICENSEE will disclose to JOHNS HOPKINS the amount and kind of product
liability insurance it obtains, will give JOHNS HOPKINS a copy of the
certificate of insurance, and will increase or change the kind of insurance at
the reasonable request of JOHNS HOPKINS, provided such insurance is available
to LICENSEE at commercially reasonable rates.

     8.3  Except as otherwise expressly set forth in this Agreement, JOHNS
HOPKINS makes no representations and extend no warranties of any kind, either
express or implied, including but not limited to warranties of merchantability,
fitness for a particular purpose, and validity of Patent Rights claims, issued
or pending.

     8.4  No liability under this Agreement shall result to a party from delay
in performance caused by force majeure, that is, circumstances beyond the
reasonable control of the party affected thereby, including, without
limitation, acts of God, earthquake, fire, flood, war, government regulations,
labor unrest, or shortage of or an inability to obtain material or equipment.

                          ARTICLE IX - EXPORT CONTROLS

     It is understood that JOHNS HOPKINS is subject to United States laws and
regulations controlling the export of technical data, computer software,
laboratory prototypes and other commodities (including the Arms Export Control
Act, as amended and the Export Administration Act of 1979), and that their
obligations hereunder are contingent on compliance with applicable United
States export laws and regulations. The transfer of certain technical data and
commodities may require a license from the cognizant agency of the United
States Government and/or written assurances by

                                      -18-
<PAGE>   19
LICENSEE that LICENSEE shall not export data or commodities to certain foreign
countries without prior approval of such agency. JOHNS HOPKINS neither
represents that a license shall not be required nor that, if required, it shall
be issued.

                          ARTICLE X - NON-USE OF NAMES

     LICENSEE shall not use the name of JOHNS HOPKINS, nor any of its
employees, or any adaptation thereof, in any advertising, promotional or sales
literature without prior written consent obtained from JOHNS HOPKINS in each
case, except that LICENSEE may state that it is licensed by JOHNS HOPKINS under
one or more of the patents and/or applications comprising the Patent Rights.

                            ARTICLE XI - ASSIGNMENT

     This Agreement may not be assigned, in whole or in part, except in
conjunction with the sale of the entire business, or an operating business
division, of LICENSEE to which the Patent Rights relate, without the prior
consent of JOHNS HOPKINS, which consent shall not be unreasonably withheld.

                        ARTICLE XII - GOVERNMENT RIGHTS

     12.1 Pursuant to 35USC202, JOHNS HOPKINS has elected to take all rights,
title and interest in the inventions forming the basis of the Patent Rights.

     12.2 LICENSEE hereby specifically agrees to cooperate with JOHNS HOPKINS
in abiding by the terms and conditions imposed on JOHNS HOPKINS pursuant to
35USC200-211 and the regulations promulgated thereunder.

                                       19

<PAGE>   20
     12.3  JOHNS HOPKINS warrants that it has compiled with and will continue
to comply with all duties and obligations running from JOHNS HOPKINS to the
Government pursuant to 35USC200-211 and the regulations promulgated thereunder.

     12.4  LICENSEE agrees to manufacture in the United States those Licensed
Products which are sold and used in the United States.


                           ARTICLE XIII - TERMINATION

     13.1  This Agreement shall terminate if LICENSEE dissolves, unless this
Agreement has been assigned prior to the date of dissolution.

     13.2  Should LICENSEE fail to pay JOHNS HOPKINS royalties due and payable
hereunder, JOHNS HOPKINS shall have the right to terminate this Agreement on
sixty (60) days' written notice, unless LICENSEE shall pay JOHNS HOPKINS within
the sixty (60) day period, all such royalties and interest due and payable.
Upon the expiration of the sixty (60) day period, if LICENSEE shall not have
paid all such royalties and interest due and payable, the rights, privileges
and license granted hereunder shall terminate.

     13.3  Upon any material breach or default of this Agreement by LICENSEE
other than those occurrences set out in Paragraphs 13.1 and 13.2 hereinabove,
which shall always take precedence in that order over any material breach or
default referred to in this Paragraph 13.3, JOHNS HOPKINS shall have the right
to terminate this Agreement and the rights, privileges and license granted
hereunder by giving ninety (90) days' notice to LICENSEE. Such termination
shall become effective unless LICENSEE shall have cured any such breach or
default prior to the expiration of the ninety (90) day period.

     13.4  LICENSEE shall have the right to terminate this Agreement at any
time on six (6) months' notice to JOHNS HOPKINS and upon payment of all amounts
due JOHNS

                                       20


<PAGE>   21
HOPKINS.

     13.5  Upon termination of this Agreement for any reason, nothing herein
shall be construed to release either party from any obligation that matured
prior to the effective date of such termination. LICENSEE and any Subsidiary
and sublicensee thereof may, however, after the effective date of such
termination, sell all Licensed Products, and complete Licensed Products in the
process of manufacture at the time of such termination and sell the same,
provided that LICENSEE shall pay to JOHNS HOPKINS the royalties thereon as
required by Article IV of this Agreement and shall submit the reports required
by Article V hereof on the sales of Licensed Products.

     13.6  Upon termination of this Agreement for any reason during the
Exclusive Period, any sublicensee not then in default shall have the right to
seek a license from JOHNS HOPKINS under the same terms and conditions as set
forth hereunder.

     13.7  The provisions of Paragraph 8.1, Article IX, and Article X shall
survive termination of this Agreement.

            ARTICLE XIV - PAYMENTS, NOTICES AND OTHER COMMUNICATIONS

     Any payment, notice or other communication pursuant to this Agreement
shall be sufficiently made or given on the date of mailing if sent to such
party by certified first class mail, postage prepaid, addressed to it at its
address below or as it shall designate by written notice given to the other
party:

     In the case of JOHNS HOPKINS:

          Johns Hopkins University
          300 Whitehead Hall
          Charles and 34th Streets
          Baltimore, Maryland  21218
          Attention: Edwin T. Yates, Ph.D.


                                       21

<PAGE>   22
                                    [Blank]


















                                       22
<PAGE>   23
With a copy to:

     Associate Dean for Corporate Affairs
     Johns Hopkins University
     School of Hygiene and Public Health
     111 Market Place, Suite 840
     Baltimore, Maryland  21202-6709
     Attention: Alan M. Goldberg, Ph.D.

In the case of LICENSEE:

     Edward Lanphier
     Sangamo BioSciences, Inc.
     P.O. Box 334
     Ross, California 94957

With a copy to:

     Stephan Dolezalek, Esq.
     Brobeck, Phleger & Harrison
     Two Embarcadero Place
     2200 Geng Road
     Palo Alto, California 94303


                     ARTICLE XV - MISCELLANEOUS PROVISIONS

     15.1  This Agreement shall be construed, governed, interpreted and applied
in accordance with the laws of the State of Maryland, U.S.A., except that
questions affecting the validity, construction and effect of any patent
licensed hereunder, shall be determined by the law of the country in which the
patent was granted.

     15.2  The parties hereto acknowledge that this Agreement sets forth the
entire Agreement and understanding of the parties hereto as to the subject
matter hereof, and shall not be subject to any change or modification except by
the execution of a written instrument subscribed to by the parties hereto.

                                       23

<PAGE>   24
     15.3 The provisions of this Agreement are severable, and in the event that
any provisions of this Agreement shall be determined to be invalid or
unenforceable under any controlling body of the law, such invalidity or
unenforceability shall not in any way affect the validity or enforceability of
the remaining provisions hereof.

     15.4 LICENSEE agrees to mark the Licensed Products sold in the United
States with all applicable United States patent numbers. All Licensed Products
shipped to or sold in other countries shall be marked in such a manner as to
conform with the patent laws and practice of the country of manufacture or sale.

     15.5 The failure of any party to assert a right hereunder or to insist upon
compliance with any term or condition of this Agreement shall not constitute a
waiver of that right or excuse a similar subsequent failure to perform any such
term or condition by the other party.

     15.6 Claims, disputes, or controversies concerning the validity,
construction, or effect of any patent licensed hereunder shall be resolved in
any court having jurisdiction thereof.

     15.7 A grant application under the Advanced Technology Program was filed on
March 29, 1995 (Appendix C). If a grant is awarded, any Invention made pursuant
thereto where an investigator at JOHNS HOPKINS is the sole inventor or a
coinventor shall be assigned to LICENSEE. Such Invention shall be assigned
hereunder and shall thereafter fall within the definition of Patent Rights and
therefore shall be subject to Sections 3.2, 3.3 and 3.4 hereof and to the
royalty payments required by Sections 4.1(c)(i), 4.1(d) and 4.4 hereof as part
of the rights licensed hereunder.


                                      24
<PAGE>   25
     IN WITNESS WHEREOF, the parties have hereunto set their hands and seals
and duly executed this Agreement the day and year set forth below.


JOHNS HOPKINS UNIVERSITY


By:
    -------------------------------------------------------
    Herbert R. Hansen, Jr., MBA, CPA
    Senior Associate Dean, Finance and Administration

Date:
      ----------------------------------

                                       OR


By: /s/ Alan M. Goldberg
    -------------------------------------------------------
    Alan M. Goldberg, Ph.D.
    Associate Dean, Corporate Affairs

Date: July 10th, 1995
      ----------------------------------

                                      AND

By: /s/ John Groopman
    -------------------------------------------------------
    John Groopman, Ph.D.
    Chairman, Environmental Health Sciences

Date: 7/10/95
      ----------------------------------


SANGAMO BIOSCIENCES, INC.


By: /s/ Edward O. Lanphier II
    -------------------------------------------------------
    Edward O. Lanphier II
    President

Date: June 30, 1995
      ----------------------------------


                                       25
<PAGE>   26
                                   APPENDIX A

PATENTS:



                                   APPENDIX B

INVENTION DISCLOSURES:



                                   APPENDIX C


ADVANCED TECHNOLOGY PROGRAM GRANT PROPOSAL:




                                   APPENDIX D


RESEARCH AGREEMENT:


                                       26
<PAGE>   27
                          THE JOHNS HOPKINS UNIVERSITY
                            BALTIMORE, MD 21218-2696

Nina M. Siegler, C.F.A.                           Office of Technology Transfer
Director                                                708 N Wyman Park Center
                                                         3400 N. Charles Street
                                                                 (410) 516-8137
                                                             Fax (410) 516-7811

                                AMENDMENT NO. 1

                        TO THE LICENSE AGREEMENT between

             Johns Hopkins University and Sangamo Biosciences, Inc.


     This Amendment No. 1, dated June 1, 1998 ("Effective Date") to the License
Agreement dated June 29, 1995 concerning the licensing and other matters of
patent properties referred to in the License Agreement as "Functional Domains in
Flavobacterium Okeanokoites (FOK1) Restriction Endonuclease", US Patent
Application Serial Number 07/862,831, filed April 3, 1992, JHU Reference C-1191,
(Dr. Srinivasan Chandrasegaran, Inventor) and other Patent Rights, is entered
into between Johns Hopkins University, a not-for-profit educational institution
having an address at 3400 N. Charles Street, Baltimore, MD ("JOHNS HOPKINS" or
"JHU") and Sangamo Biosciences, Inc., a corporation of the State of Delaware and
having a principal place of business at Point Richmond Tech Center, 501 Canal
Blvd, Suite A-100, Richmond, CA ("LICENSEE").

This document amends the License Agreement by the following:

1.   In Paragraph 4.1, delete in its entirety paragraph 4.1.(c). Replace with
     new Paragraph 4.1.(c):

               4.1.(c)  LICENSEE shall also pay to JOHNS HOPKINS a running
               royalty on Licensed Products as follows:

                        (i) for therapeutic products,        *         of Net
                            Sales
                        (ii) for diagnostic products,        *         of Net
                             Sales
                        (iii) for reagent products,            *            of
                              Net Sales

2.   Delete in its entirety Paragraph 4.4, and replace with the following new
     Paragraph 4.4:

               4.4  LICENSEE shall pay to JOHNS HOPKINS a minimum annual royalty
               according to the following schedule and within thirty (30) days
               of the end of the calendar year:




* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   28
Amendment No. 1
Sangamo License Agreement
page 2

                         1999,2000         *    per year
                         2001-2005         *    per year
                         2006 and until termination    *    per year


               Failure by LICENSEE to pay the minimum annual royalty required by
               this Paragraph 4.4 shall give JOHNS HOPKINS the right to convert
               the exclusive license granted by this Agreement to a nonexclusive
               license.

3.   Add new Paragraph 4.5 as follows:

               4.5  For the rights, privileges and license granted by Amendment
               No. 1, dated ______, LICENSEE agrees to pay to JOHNS HOPKINS the
               sum of                      *                            ,
               payable in equal installments within eighteen months of the
               Effective Date of Amendment No. 1.

4.   Add new Paragraph 6.6 as follows:

               6.6  LICENSEE shall have the right, but not the obligation, to
               assume primary responsibility for patent prosecution. JOHNS
               HOPKINS hereby agrees to reasonably cooperate with the transfer
               of case files, execution of appropriate documents and any other
               matters needed for LICENSEE to assume such responsibility. In
               such case, LICENSEE shall provide to JHU copies of all
               correspondence from and to the US PTO and international
               equivalents with sufficient time to allow for comment by JHU.
               LICENSEE shall endeavor to accommodate JHU's comments into a
               reasonable patent prosecution strategy. In no case shall LICENSEE
               abandon any application or patent in any country without prior
               approval from JHU. In any country where the LICENSEE elects not
               to have a patent application filed or to pay expenses associated
               with filing, prosecuting, or maintaining a patent application or
               patent, LICENSEE shall notify JHU allowing at least thirty (30)
               days for JHU to assume such responsibilities. JHU may file,
               prosecute, and/or maintain a patent application or patent at its
               own expense and for its own exclusive benefit and the LICENSEE
               thereafter shall not be licensed under such patent or patent
               application. Upon termination of this Agreement, LICENSEE shall
               immediately transfer all case files, execute any appropriate
               documents related to patent matters and cooperate in any other
               matters needed for JHU to assume responsibility for patent
               prosecution.


                                       2

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   29
Amendment No. 1
Sangamo License Agreement
page 3

5.   In Paragraph 13.7, add after "Article X", insert, "Paragraph 4.5 and
Paragraph 6.6".

6.   Add new Paragraph 15.8 as follows:

               15.8  With respect to "Methods for Inactivating Target DNA and
               For Detecting Conformation Change in a Nucleic Acid", Inventor,
               Srinivasan Chandrasegaran, US Patent Application SN 08/647,449,
               Filed 5/7/96 (JHU Docket: C-1288), LICENSEE hereby acknowledges
               and agrees that Dr. Chandrasegaran is the sole inventor of this
               property.

7.   In Appendix A, add:

               5.    "General Method to Clone Hybrid Restriction Endonucleases
                     Using lig Gene"
                     Srinivasan Chandrasegaran,
                     US Patent Application SN 08/575,361          Filed 12/24/95
                     JHU Docket: C-1274

               6.    "Methods for Inactivating Target DNA and For Detecting
                     Conformation Change in a Nucleic Acid"
                     Srinivasan Chandrasegaran,
                     US Patent Application SN 08/647,449          Filed 5/7/96
                     JHU Docket: C-1288

8.   Except as expressly modified by this Amendment No. 1, the License Agreement
     shall remain in full force and effect.

9.   In Paragraph 3.2(e) change it to read, "Within seven (7) years of the
     Effective Date of this Agreement, LICENSEE shall have made a commercial
     sale of at least one (1) Licensed Product."


                                       3
<PAGE>   30
Amendment No. 1
Sangamo License Agreement
page 4


     IN WITNESS WHEREOF, the parties have caused this Amendment to be duly
executed and delivered as of the date first written above.


For Sangamo Biosciences, Inc.:


/s/ Edward O. Lanphier II                             7/16/98
- --------------------------------------            ---------------
Edward O. Lanphier II                                  Date
President


For Johns Hopkins University:



/s/ Herbert R. Hansen, J.                             7/8/98
- --------------------------------------            ---------------
Herbert R. Hansen, J., MBA, CPA                        Date
Senior Associate Dean, Finance and
Administration



Sangamo Amendment #1 (6/29/98)





                                       4
<PAGE>   31

Ms. Nina M. Siegler
Director, Office of Technology Transfer
Johns Hopkins University
708N Wyman Park Center
3400 N. Charles Street
Baltimore, MD 21218-2695

Dear Nina:

               As you know, the License Agreement between Johns Hopkins
University ("JHU") and Sangamo BioSciences, Inc. dated June 29, 1995, in Article
IV(a) at page 9, grants JHU certain rights to invest its own funds in investment
funding of Sangamo.

               Sangamo has filed a Registration Statement with the SEC for an
initial public offering ("IPO") which we expect will take place in late March or
April 2000. While we understand that Article IV(a) was intended to apply to
private financings prior to our IPO, Lehman Bros., our lead underwriter, has
asked us to have you confirm that paragraph (a) of Article IV will terminate
upon our IPO. In accordance with our telephone conversation on March 9, 2000, in
order to make it completely clear that Article IV(a) will not apply to our IPO
and thereafter Sangamo will pay JHU $25,000 upon receipt of a signed copy of
this letter and an additional $25,000 on September 15, 2000 in consideration for
the following amendment to the License Agreement and Agreement:

               Article IV(a) is hereby amended by adding the following sentence
               at the end of paragraph (a): "THE PROVISIONS OF THIS PARAGRAPH
               (a) WILL TERMINATE UPON THE SALE BY THE COMPANY OF ITS COMMON
               STOCK IN ITS INITIAL PUBLIC OFFERING MADE PURSUANT TO A
               REGISTRATION STATEMENT DECLARED EFFECTIVE BY THE SECURITIES AND
               EXCHANGE COMMISSION."


JHU acknowledges that Sangamo has complied with all of the provisions of Article
IV(a).

               Please sign a copy of this letter and return it to me at your
earliest convenience. We appreciate your cooperation in helping us become a
public company.

                                   Sincerely,

                                   Edward Lanphier

THE FOREGOING IS AGREED TO:
JOHNS HOPKINS UNIVERSITY

By:
   --------------------------------
Dated:                       , 2000
      ----------------------

<PAGE>   1
                                                                  EXHIBIT 10.14


                            MEDICAL RESEARCH COUNCIL

                                     -AND-

                              SANGAMO BIOSCIENCES

                                 L I C E N C E

                                      FOR

                              ZINC FINGERS PATENT
<PAGE>   2

                                                                   EXHIBIT 10.14

THIS AGREEMENT is made the 1 day of September One thousand nine hundred and
ninety six between MEDICAL RESEARCH COUNCIL of 20 Park Crescent, London W1N 4AL
(hereinafter called "MRC" which expression includes its successors and assigns)
of the one part and Sangamo Biosciences of 950 Marina Village Parkway, Alameda,
CA 94501, U.S.A. (hereinafter called "the Licensee" which expression includes
its successors and permitted assigns) of the other part.


WHEREAS:-

(A)  MRC is the proprietor of certain applications for patent rights in respect
     of methods of selecting and designing polypeptides comprising zinc finger
     binding motifs and polypeptides made by these methods.

(B)  The Licensee wishes to obtain a licence to the applications from MRC, and
     MRC is willing to grant such licence on the terms, and subject to the
     conditions, which follow.


NOW IT IS HEREBY AGREED as follows:-


1.   Definitions

     (1)  In this Agreement the following words and expression shall be
         construed as follows:-

     "Affiliate" shall mean any corporation, company, partnership or other
     entity which directly or indirectly controls, is controlled by or is under
     common control with either party to this Agreement.

     "Control" means the ownership of more than 50% of issued share capital or
     the legal power to direct or cause the direction of the general management
     and policies of the party in question.


                                       1
<PAGE>   3
     "THE EFFECTIVE DATE" shall mean the date of execution above written.

     "NET INVOICE PRICE" shall mean in relation to a Product sold by Licensee or
     sub-licensee of Licensee, the price invoiced by Licensee (or sub-licensee
     as appropriate) to the relevant purchaser (or in the case of a sale or
     other disposal otherwise than at arm's length, the price which would have
     been invoiced in a bona fide arm's length contract of sale), but deducting
     the costs of packing, transport and insurance, customer duties, any credits
     actually given for returned or defective Products, normal trade discounts
     actually given, and sales taxes, VAT or other similar tax charged on and
     included in the invoice price to the purchaser.

     "THE PATENT RIGHTS" shall mean:-

          (a)  the patent applications short particulars of which are set out in
               Schedule 1;
          (b)  all patents which may be granted pursuant to any of the foregoing
               applications;
          (c)  any patents which derive from the foregoing patent applications
               including any divisions, renewals, continuations,
               continuations-in-part, extensions or reissues thereof.

     "THE PRODUCTS" shall mean products whose development (including use of the
     methods claimed in the Patent Rights), manufacture use or sale would, but
     for this licence, infringe the Patent Rights.

     (2)  In this Agreement the singular shall where the context so permits
          include the plural and vice versa.


2.   Commencement

     This Agreement shall be deemed to have come into force on the Effective
     Date and shall be read and construed accordingly.


                                       2
<PAGE>   4
3.   Grant of Rights

     (1) MRC agrees to grant to the Licensee a non-exclusive worldwide licence
         under the Patent Rights to develop manufacture use and sell Products.

     (2) The Licensee shall have the right to grant sub-licenses of the rights
         granted to it under this Agreement but only in conjunction with a
         licence of Licensee's complementary technology and in a defined field
         equivalent to that licensed technology. Any such sub-license shall be
         granted on and shall contain substantially similar terms and conditions
         as the clauses of this Agreement including, but without limitation, the
         terms herein relating to indemnity.

     (3) Prior to the first anniversary of the Effective Date MRC shall review
         the scope and desirability for entering negotiations with Licensee for
         conversion of this agreement to an exclusive licence in whole or in
         part, and MRC shall inform Licensee on or about the first anniversary
         of the Effective Date whether it wishes to enter such negotiations. For
         the avoidance of doubt, neither party is under any obligation to enter
         such negotiations, or committed to accept specific terms for conversion
         of an exclusive or partially exclusive licence.

4.   Payments

     (1) In consideration for the non-exclusive licence granted pursuant to
         Clause 3.1 hereof the Licensee shall pay to MRC the following sums:

         (i)         *      to be paid upon               *              .

         (ii)        *      to be paid on the 1st anniversary of the Effective
               Date.

         (iii)       *      to be paid on the 2nd anniversary of the Effective
               Date.

         (iv)        *      to be paid on the 3rd anniversary of the Effective
               Date.


                                       3

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>   5

(2)  In further consideration for the licence granted pursuant to Clause 3.1
     hereof the Licensee shall pay to MRC the following milestone payments:-

      (i)        *       to be paid on

                                       *
           relating to products derived in whole or in part from the
           technology described and claimed in the Patent Rights.

     (ii)   *   to be paid on

                                       *
           relating to products derived in whole or in part from the technology
           described and claimed in the Patent Rights.

    (iii)   *   to be paid on

                                       *
           relating to products derived in whole or in part from the technology
           described and claimed in the Patent Rights.

(3)  In further consideration of the licence granted by MRC to Licensee under
     Clause 3(1), Licensee shall pay to MRC a royalty of  *  of the Net
     Invoice Price on all sales of Products by Licensee or any Affiliate or any
     sub-licensee where the Products are either manufactured and/or sold in a
     country where a patent under the Patent Rights is granted valid and
     subsisting at the date of such sale.

(4)  If the Licensee is required to pay total royalties in excess of   *   of
     Net Invoice Price to parties other than MRC the royalty payable to MRC may
     be reduced by the amount of royalty in excess of   *   payable to such
     other parties but in no event shall the royalty payable to the MRC be
     reduced by      *       from the royalty rate specified in Clause 4(3). If
     the Licensee avails itself of the provision of this paragraph, the Licensee
     agrees to provide the MRC with proof of such royalties paid to other
     parties.


                                       4

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   6
(5)  Licensee agrees to keep true and accurate records and books of account
     containing all data necessary for the calculation of the milestone
     payments and royalties payable to MRC under Clause 4(2) and 4(3). Such
     records and books of account shall upon reasonable notice having been
     given by MRC be open at all reasonable times during business hours for
     inspection by MRC or its duly authorised representative.

(6)  Licensee shall prepare a statement in respect of each calendar quarter of
     this Agreement which shall show for the calendar quarter in question the
     quantity of Products manufactured and sold by the Licensee and
     sub-licensees in each country and the Net Invoice Price of each Product so
     sold and the royalty due to MRC thereon pursuant to Clause 4(3) above. Such
     statement shall be submitted to MRC within 60 days following the end of the
     calendar quarter or part thereof to which it relates together with a
     remittance for the royalties due to MRC. If MRC shall give notice to
     Licensee within 60 days of the receipt of any such statement that it does
     not accept the same such statement shall be certified by an independent
     chartered accountant appointed by agreement between the parties or, in
     default of agreement within 14 days, by the President for the time being of
     the Institute of Chartered Accountants of England and Wales in London.
     Licensee shall make available all books and records required for the
     purpose of such certification at reasonable times during normal business
     hours and the statement so certified shall be binding between the parties.
     The costs of such certification shall be the responsibility of MRC if the
     certification shows the original statement to have been accurate and
     otherwise shall be the responsibility of Licensee. Following any such
     certification the parties shall make any adjustments necessary in respect
     of the royalties already paid to MRC in relation to the period in question.

(7)  The Licensee shall pay royalties to MRC free and clear of and without
     deduction or deferment in respect of any demand, set-off, counterclaim or
     other dispute and so far as is legally possible such payment shall be made
     free and clear of any taxes imposed by or under the authority of any
     government or public authority and in particular but


                                       5



<PAGE>   7
          without limitation where any sums due to be paid to MRC hereunder are
          subject to any withholding or similar tax, the Licensee shall pay such
          additional amount as shall be required to ensure that the net amount
          received by MRC hereunder will equal the full amount which would have
          been received by it had not such tax been imposed or withheld. The
          Licensee and, without prejudice to the foregoing, MRC shall use their
          best endeavors to do all such lawful acts and things and to sign all
          such lawful deeds and documents as will enable the Licensee to take
          advantage of any applicable legal provision or any double taxation
          treaties with the object of paying the sums due to MRC without
          imposing or withholding any tax.

          Sums are expressed in this agreement as exclusive of any value added
          tax (VAT) which might be applicable. MRC agrees to provide Licensee
          with a VAT invoice in respect of every payment affected by VAT.

     (8)  Where MRC does not receive payment of any sums due to it within the
          period specified hereunder in respect thereof interest shall accrue on
          the sum outstanding at the rate of * per month calculated on a daily
          basis without prejudice to MRC right to receive payment on the due
          date therefor.

5.   Patent Prosecution and Infringement

     (1)  MRC shall be responsible for seeking issuance and maintenance of the
          Patent Rights.

     (2)  If the Licensee becomes aware of a suspected infringement of the
          Patent Rights it shall notify MRC giving full particulars thereof. If
          the alleged infringement consists of any act which (if done by the
          Licensee) would be within the scope of the licences granted under this
          Agreement MRC and the Licensee shall (within a reasonable time of the
          said notification) consult together with a view to agreeing upon a
          course of action to be pursued.


                                       6

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>   8
6.   Term and Termination

     (1)  Subject as hereinafter provided this Agreement and the licence granted
          pursuant thereto shall continue in force in each territory during the
          subsistence of the last to expire of the Patent Rights.

     (2)  MRC may terminate this Agreement and the said licences forthwith by
          notice to the Licensee to that effect upon the happening of any of the
          following events:-

          (i)  if the Licensee fails to perform or observe any of the
               obligations on its part to be performed or observed and if the
               breach is one capable of remedy has not been remedied within
               three (3) months of the giving of a notice informing the Licensee
               of such breach;

          (ii) if the Licensee files a voluntary petition in bankruptcy or
               applies to any Tribunal for a Receiver Trustee or similar officer
               to be appointed by any Court or Executive Department to liquidate
               or conserve the Licensee or any substantial part of its property
               or assets due to insolvency or to the threat thereof or if the
               Licensee suffers any trusteeship or receivership to continue
               undischarged for a period of sixty days or suffers any similar
               procedure for the relief of distressed debtors entered into by
               the Licensee voluntarily or involuntarily or if the Licensee is
               otherwise divested of its assets for a period of sixty days or
               makes a general assignment for the benefit of its creditors;

     (3)  The Licensee may terminate this Agreement and the Licences granted
          pursuant hereto by giving to MRC 6 months notice to that effect. Such
          termination shall be without prejudice to the right of MRC to enforce
          the Patent Rights in the event of subsequent manufacture of Products
          by the Licensee.

     (4)  Termination of this Agreement or of the said Licences shall be without
          prejudice to any rights of either party against the other which may
          have accrued up to the date of


                                       7

<PAGE>   9
          such termination and the licensee shall pay to MRC the appropriate
          royalties hereunder on all stocks of the Products (on which royalties
          have not already been paid) held at the date of termination by the
          Licensee or any person engaged by the same to manufacture the Products
          and shall thereafter be free to sell such products on which royalty
          has been paid.

7.   Warranties

     (1)  MRC hereby represents and warrants that MRC owns the Patent Rights or
          is otherwise authorised to licence the Patent Rights to the Licensee.

     (2)  Nothing in this Agreement or in any licences to be granted pursuant
          thereto shall be construed as a representation or warranty that any of
          the said Patent Rights are valid or that any development manufacture
          use sale or other disposal of the Products is not an infringement of
          any patents or other rights not vested in the MRC.

     (3)  The Licensee shall promote the sale of the Products of good marketable
          quality and shall use reasonable endeavours to meet the market demand
          therefore.

8.   Liability and Indemnity

     Licensee hereby undertakes and agrees to be solely responsible at its own
     cost and expense for dealing with and for any liability arising from any
     contractual tortious or other claims or proceedings concerning the Products
     or their development production marketing distribution or sale and in
     particular product liability claims or proceedings. Further, Licensee
     hereby grants MRC an indemnity against any loss damage costs or expense
     incurred or suffered by MRC arising out of any such claims or proceedings.

9.   Waiver

     The waiver by MRC of any breach default or omission in the performance or
     observance of


                                       8

<PAGE>   10
     any of the terms of this Agreement by the Licensee shall not be deemed to
     be a waiver of any other such breach default or omission.

10.  Notices

     Any notice consent or other communication authorised or required to be
     given hereunder or for the purposes hereof shall be in writing and be
     deemed to be duly given to MRC if left at or sent by recorded delivery or
     registered post addressed to its principal office and to the Licensee if
     left at or sent by recorded delivery or registered post to its principal
     place of business. Any such notice consent or other communication if served
     by post shall be deemed to have been given at the time when it would have
     been received in due course of the post.

11.  Non-assignability

     Save for an assignment to an Affiliate of the Licensee, the Licensee shall
     not be entitled to assign the benefit of this Agreement or any rights
     granted or to be granted under the Agreement.

12.  Non-Use of Names

     Licensee shall not use the name of MRC nor of any of its employees or
     agents in any advertising promotional or sales literature without obtaining
     the prior written consent of MRC in each case, except that Licensee may
     state that it is licensed by MRC under one or more patents and/or
     applications comprising the Patent Rights.

13.  Law and Jurisdiction

     This Agreement is to be read and construed in accordance with and governed
     by the Laws of England so far as the subject matter allows and the parties
     hereby submit to the jurisdiction of the English courts in relation to any
     dispute arising out of this Agreement.


                                       9
<PAGE>   11
In witness whereof the parties hereto have caused this Agreement to be executed
in the matter legally binding upon them by causing authorised representatives to
sign this Agreement.




Signed by:                                    /s/ Martin R. Wood, 21 August 1996
                                              ----------------------------------

For and on behalf of                                  Martin R. Wood Ph.D.
MEDICAL RESEARCH COUNCIL                       Head of Technology Transfer Group



Signed by:                                         /s/ Edward O. Lanphier
                                               ---------------------------------
For and on behalf of                                   EDWARD O. LANPHIER
SANGAMO BIOSCIENCES                                         PRESIDENT



                                       10

<PAGE>   1

                                                                    EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


     We consent to the reference to our firm under the captions "Selected
Financial Data" and "Experts" and to the use of our report dated January 28,
2000, except for Note 7, as to which the date is March 28, 2000, in Amendment
No. 3 to Registration Statement (Form S-1 No. 333-30134) and related Prospectus
of Sangamo BioSciences, Inc. for the registration of 5,750,000 shares of its
common stock.



                                          /s/  ERNST & YOUNG LLP


Palo Alto, California

April 3, 2000





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