SANGAMO BIOSCIENCES INC
S-8, 2000-04-06
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1
     As filed with the Securities and Exchange Commission on April 6, 2000
                                               Registration No. 333-____________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933

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

                            SANGAMO BIOSCIENCES, INC.
             (Exact name of registrant as specified in its charter)

           DELAWARE                                      68-0359556
 (State or other jurisdiction                 (IRS Employer Identification No.)
of incorporation or organization)

                         501 CANAL BOULEVARD, SUITE A100
                           RICHMOND, CALIFORNIA 94804
               (Address of principal executive offices) (Zip Code)

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

                            SANGAMO BIOSCIENCES, INC.
                            2000 STOCK INCENTIVE PLAN
                        2000 EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the Plans)

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

                              EDWARD O. LANPHIER II
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                            SANGAMO BIOSCIENCES, INC.
                         501 CANAL BOULEVARD, SUITE A100
                           RICHMOND, CALIFORNIA 94804
                     (Name and address of agent for service)
                                 (510) 970-6000
          (Telephone number, including area code, of agent for service)

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

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
==========================================================================================================================
                                                                   Proposed              Proposed
              Title of                                             Maximum               Maximum
             Securities                      Amount                Offering             Aggregate
               to be                          to be                 Price                Offering             Amount of
             Registered                   Registered(1)           per Share              Price(2)            Registration
- --------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>                       <C>               <C>                      <C>
2000 Stock Incentive Plan
Common Stock, $0.01 par value            3,635,832 shares         $15.00(2)         $54,537,480(2)           $14,398
- --------------------------------------------------------------------------------------------------------------------------
2000 Employee Stock Purchase Plan
Common Stock, $0.01 par value              400,000 shares         $15.00(2)         $ 6,000,000(2)           $ 1,584
- --------------------------------------------------------------------------------------------------------------------------
Aggregate Registration Fee                                                                                   $15,982
==========================================================================================================================
</TABLE>

(1)     This Registration Statement shall also cover any additional shares of
        Common Stock which become issuable under the Registrant's. 2000 Stock
        Incentive Plan and the 2000 Employee Stock Purchase Plan by reason of
        any stock dividend, stock split, recapitalization or other similar
        transaction effected without the Registrant's receipt of consideration
        which results in an increase in the number of the outstanding shares of
        Registrant's Common Stock.

(2)     Calculated solely for purposes of this offering under Rule 457(h) of the
        Securities Act of 1933, as amended, on the basis of the highest proposed
        selling price per share of Registrant's Common Stock.

<PAGE>   2
                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

               Sangamo BioSciences, Inc. (the "Registrant") hereby incorporates
by reference into this Registration Statement the following documents previously
filed with the Securities and Exchange Commission (the "Commission"):

        (a)    The Registrant's Registration Statement No. 333-30134 on Form S-1
               filed with the Commission on February 11, 2000, as amended on
               Form S-1/A filed with the Commission on February 24, 2000, March
               14, 2000, April 4, 2000, April 5, 2000, and April 6, 2000, in
               which there is set forth the audited financial statements for the
               Registrant's fiscal year ended December 31, 1999; and

        (b)    The Registrant's Registration Statement No. 000-30171 on Form 8-A
               filed with the Commission on March 31, 2000 pursuant to Section
               12(g) of the Securities Exchange Act of 1934 (the "Exchange
               Act"), in which there is described the terms, rights, and
               provisions applicable to the Registrant's outstanding Common
               Stock.

               All reports and definitive proxy or information statements filed
pursuant to Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of
1934, as amended (the "1934 Act"), after the date of this Registration Statement
and prior to the filing of a post-effective amendment which indicates that all
securities offered hereby have been sold or which de-registers all securities
then remaining unsold shall be deemed to be incorporated by reference into this
Registration Statement and to be a part hereof from the date of filing of such
documents. Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Registration Statement to the extent that a statement
contained herein or in any subsequently filed document which also is deemed to
be incorporated by reference herein modifies or supersedes such statement. Any
such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this Registration Statement.

Item 4. Description of Securities

        Not Applicable.

Item 5. Interests of Named Experts and Counsel

        Not Applicable.

Item 6. 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 Registrant's bylaws provides for
mandatory indemnification of its directors and officers and permissible
indemnification of employees and other agents to the maximum extent permitted by
the Delaware General Corporation Law. Registrant's certificate of incorporation
provides that, subject to Delaware law, its directors will not be personally
liable for monetary damages for breach of the a director's fiduciary duty as
directors to Registrant and its stockholders. This provision in the certificate
of incorporation does not eliminate a director's 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 Registrant or its 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


                                      II-1
<PAGE>   3
director, and for payment of dividends or approval of stock purchases 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. Registrant has entered
into indemnification agreements with its officers and directors. Reference is
made to Exhibit 10.4 to Registration Statement No. 333-30134. The
indemnification agreements provide Registrant's 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 to Registration Statement No. 333-30134, indemnifying
Registrant's officers and directors against specific liabilities, and
Registrant's Second Amended and Restated Registration Rights Agreement contained
in Exhibit 10.3 to Registration Statement No. 333-30134, indemnifying the
parties thereto, including controlling stockholders, against liabilities.

Item 7. Exemption from Registration Claimed

        Not Applicable.

Item 8. Exhibits

<TABLE>
<CAPTION>
Exhibit Number    Exhibit
- --------------    -------
<S>               <C>
       4          Instruments Defining the Rights of Stockholders. Reference is
                  made to Registrant's Registration Statement No. 000-30171 on
                  Form 8-A, together with the exhibits thereto, which are
                  incorporated herein by reference pursuant to Item 3(b) to this
                  Registration Statement.

       5          Opinion and Consent of Brobeck, Phleger & Harrison LLP.

      23.1        Consent of Ernst & Young LLP, Independent Auditors.

      23.2        Consent of Brobeck, Phleger & Harrison LLP is contained in Exhibit 5.

      24          Power of Attorney.  Reference is made to page II-4 of this Registration
                  Statement.

      99.1        Sangamo BioSciences, Inc. 2000 Stock Incentive Plan

      99.2        Sangamo BioSciences, Inc. 2000 Employee Stock Purchase Plan.
</TABLE>

Item 9. Undertakings

               A. The undersigned Registrant hereby undertakes: (1) to file,
during any period in which offers or sales are being made, a post-effective
amendment to this Registration Statement: (i) to include any prospectus required
by Section 10(a)(3) of the 1933 Act, (ii) to reflect in the prospectus any facts
or events arising after the effective date of this Registration Statement (or
the most recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in this
Registration Statement and (iii) to include any material information with
respect to the plan of distribution not previously disclosed in this
Registration Statement or any material change to such information in this
Registration Statement; provided, however, that clauses (1)(i) and (1)(ii) shall
not apply if the information required to be included in a post-effective
amendment by those clauses is contained in periodic reports filed by the
Registrant pursuant to Section 13 or Section 15(d) of the 1934 Act that are
incorporated by reference into this Registration Statement; (2) that for the
purpose of determining any liability under the 1933 Act each such post-effective
amendment shall be deemed to be a new registration statement relating to the
securities offered therein and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof; and (3) to remove
from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the Registrant's 2000
Stock Incentive Plan or 2000 Employee Stock Purchase Plan.

               B. The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the 1933 Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
1934 Act that is incorporated by reference into this Registration Statement
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.

               C. Insofar as indemnification for liabilities arising under the
1933 Act may be permitted to directors, officers or controlling persons of the
Registrant pursuant to the indemnification provisions summarized in Item 6 or
otherwise, the Registrant has been advised that, in the opinion of the
Commission, such indemnification is


                                      II-2
<PAGE>   4
against public policy as expressed in the 1933 Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer, or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the 1933 Act and will be governed by the final
adjudication of such issue.


                                      II-3
<PAGE>   5
                                   SIGNATURES

               Pursuant to the requirements of the Securities Act of 1933, as
amended, the Registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8, and has duly caused
this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Richmond, State of California on this
6th day of April, 2000.

                                   SANGAMO BIOSCIENCES, INC.

                                   By:  /s/ EDWARD O. LANPHIER II
                                        ----------------------------------------
                                        Edward O. Lanphier II
                                        President and Chief Executive Officer

                                POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS:

               That each person whose signature appears below constitutes and
appoints Edward O. Lanphier II, President and Chief Executive Officer, and Shawn
K. Johnson, Director of Finance, and each of them, as such person's true and
lawful attorneys-in-fact and agents, with full power of substitution and
resubstitution, for such person and in such person's name, place and stead, in
any and all capacities, to sign any and all amendments (including post-effective
amendments) to this Registration Statement, and to file same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection therewith, as fully to all
intents and purposes as such person might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or any of
them, or their or his or her substitutes, may lawfully do or cause to be done by
virtue thereof.

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

<TABLE>
<CAPTION>
           SIGNATURE                               TITLE                               DATE
           ---------                               -----                               ----
<S>                                <C>                                            <C>

/s/ EDWARD O. LANPHIER II          President, Chief Executive Officer             April 6, 2000
- -----------------------------      and Director (Principal Executive Officer)
Edward O. Lanphier II


/s/ SHAWN K. JOHNSON               Director of Finance                            April 6, 2000
- -----------------------------      (Principal Accounting Officer)
Shawn K. Johnson


                                   Director                                       April ___, 2000
- -----------------------------
Herbert W. Boyer, Ph.D.
</TABLE>


                                      II-4
<PAGE>   6

<TABLE>
<CAPTION>
           SIGNATURE                               TITLE                               DATE
           ---------                               -----                               ----
<S>                                <C>                                            <C>
/s/ WILLIAM G. GERBER, M.D.        Director                                       April 6, 2000
- -----------------------------
William G. Gerber, M.D.


/s/ JOHN W. LARSON                 Director                                       April 6, 2000
- -----------------------------
John W. Larson


/S/ WILLIAM J. RUTTER, PH.D.       Director                                       April 6, 2000
- -----------------------------
William J. Rutter, Ph.D.


/s/ MICHAEL C. WOOD                Director                                       April 6, 2000
- -----------------------------
Michael C. Wood
</TABLE>


                                      II-5
<PAGE>   7
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    EXHIBITS

                                       TO

                                    FORM S-8

                                      UNDER

                             SECURITIES ACT OF 1933


                            SANGAMO BIOSCIENCES, INC.

<PAGE>   8
                                     EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit Number    Exhibit
- --------------    -------
<S>               <C>
       4          Instruments Defining the Rights of Stockholders. Reference is
                  made to Registrant's Registration Statement No. 000-30171 on
                  Form 8-A, together with the exhibits thereto, which are
                  incorporated herein by reference pursuant to Item 3(b) to this
                  Registration Statement.

       5          Opinion and Consent of Brobeck, Phleger & Harrison LLP.

      23.1        Consent of Ernst & Young LLP, Independent Auditors.

      23.2        Consent of Brobeck, Phleger & Harrison LLP is contained in Exhibit 5.

      24          Power of Attorney.  Reference is made to page II-4 of this Registration
                  Statement.

      99.1        Sangamo BioSciences, Inc. 2000 Stock Incentive Plan

      99.2        Sangamo BioSciences, Inc. 2000 Employee Stock Purchase Plan.
</TABLE>


<PAGE>   1
                                    EXHIBIT 5

             OPINION AND CONSENT OF BROBECK, PHLEGER & HARRISON LLP

                                 April 6, 2000

Sangamo BioSciences, Inc.
501 Canal Boulevard, Suite A100
Richmond, California 94804

               Re: Sangamo BioSciences, Inc.- Registration Statement on Form S-8

Dear Ladies and Gentlemen:

               We have acted as counsel to Sangamo BioSciences, Inc., a Delaware
Corporation (the "Company"), in connection with the registration on Form S-8
(the "Registration Statement") under the Securities Act of 1933, as amended, of
(i) 3,635,832 shares of Common Stock under the Company's 2000 Stock Incentive
Plan (the "Incentive Plan"), and (ii) 400,000 shares of Common Stock under the
Company's 2000 Employee Stock Purchase Plan (the "Purchase Plan"). All of such
shares are collectively referred to herein as the "Shares".

               This opinion is being furnished in accordance with the
requirements of Item 8 of Form S-8 and Item 601(b)(5)(i) of Regulation S-K.

               We have reviewed the Company's charter documents and the
corporate proceedings taken by the Company in connection with the establishment
of the Incentive Plan and the Purchase Plan. Based on such review, we are of the
opinion that, if, as and when the Shares have been issued and sold (and the
consideration therefor received) pursuant to the (a) provisions of option
agreements duly authorized under the Incentive Plan and in accordance with the
Registration Statement, (b) duly authorized direct stock issuances effected
under the Incentive Plan and in accordance with the Registration Statement, or
(c) duly authorized stock purchase agreements under the Purchase Plan and in
accordance with the Registration Statement, such Shares will be duly authorized,
legally issued, fully paid and nonassessable.

               We consent to the filing of this opinion letter as Exhibit 5 to
the Registration Statement.

               This opinion letter is rendered as of the date first written
above and we disclaim any obligation to advise you of facts, circumstances,
events or developments which hereafter may be brought to our attention and which
may alter, affect or modify the opinion expressed herein. Our opinion is
expressly limited to the matters set forth above and we render no opinion,
whether by implication or otherwise, as to any other matters relating to the
Company, the Incentive Plan, the Purchase Plan, or the Shares.

                                        Very truly yours,

                                        /s/ BROBECK, PHLEGER & HARRISON LLP
                                        -----------------------------------
                                            BROBECK, PHLEGER & HARRISON LLP

<PAGE>   1
                                                                    EXHIBIT 23.1


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the 2000 Stock Incentive Plan and 2000 Employee Stock
Purchase Plan of Sangamo BioSciences, Inc. of our report dated January 28, 2000,
except for Note 7, as to which date is March 28, 2000, included in Amendment No.
6 to the Registration Statement (Form S-1 No. 333-30134) of Sangamo BioSciences,
Inc. which was declared effective by the Securities and Exchange Commission on
April 6, 2000.

                                            ERNST & YOUNG LLP
Palo Alto, California
April 6, 2000

<PAGE>   1
                                  EXHIBIT 99.1

                            SANGAMO BIOSCIENCES, INC.
                            2000 STOCK INCENTIVE PLAN

<PAGE>   2
                            SANGAMO BIOSCIENCES, INC.

                            2000 STOCK INCENTIVE PLAN

                                   ARTICLE ONE

                               GENERAL PROVISIONS


         I.       PURPOSE OF THE PLAN

                  This 2000 Stock Incentive Plan is intended to promote the
interests of Sangamo BioSciences, Inc., a Delaware corporation, by providing
eligible persons in the Corporation's service with the opportunity to acquire a
proprietary interest, or otherwise increase their proprietary interest, in the
Corporation as an incentive for them to remain in such service.

                  Capitalized terms shall have the meanings assigned to such
terms in the attached Appendix.

         II.      STRUCTURE OF THE PLAN

                  A. The Plan shall be divided into five separate equity
incentives programs:

                           - the Discretionary Option Grant Program under which
eligible persons may, at the discretion of the Plan Administrator, be granted
options to purchase shares of Common Stock,

                           - the Salary Investment Option Grant Program under
which eligible employees may elect to have a portion of their base salary
invested each year in special option grants,

                           - the Stock Issuance Program under which eligible
persons may, at the discretion of the Plan Administrator, be issued shares of
Common Stock directly, either through the immediate purchase of such shares or
as a bonus for services rendered the Corporation (or any Parent or Subsidiary),

                           - the Automatic Option Grant Program under which
eligible non-employee Board members shall automatically receive option grants at
designated intervals over their period of continued Board service, and

                           - the Director Fee Option Grant Program under which
non-employee Board members may elect to have all or any portion of their annual
retainer fee otherwise payable in cash applied to a special stock option grant.

                  B. The provisions of Articles One and Seven shall apply to all
equity programs under the Plan and shall govern the interests of all persons
under the Plan.

<PAGE>   3
         III.     ADMINISTRATION OF THE PLAN

                  A. The Primary Committee shall have sole and exclusive
authority to administer the Discretionary Option Grant and Stock Issuance
Programs with respect to Section 16 Insiders. Administration of the
Discretionary Option Grant and Stock Issuance Programs with respect to all other
persons eligible to participate in those programs may, at the Board's
discretion, be vested in the Primary Committee or a Secondary Committee, or the
Board may retain the power to administer those programs with respect to all such
persons. However, any discretionary option grants or stock issuances for members
of the Primary Committee must be authorized by a disinterested majority of the
Board.

                  B. Members of the Primary Committee or any Secondary Committee
shall serve for such period of time as the Board may determine and may be
removed by the Board at any time. The Board may also at any time terminate the
functions of any Secondary Committee and reassume all powers and authority
previously delegated to such committee.

                  C. Each Plan Administrator shall, within the scope of its
administrative functions under the Plan, have full power and authority (subject
to the provisions of the Plan) to establish such rules and regulations as it may
deem appropriate for proper administration of the Discretionary Option Grant and
Stock Issuance Programs and to make such determinations under, and issue such
interpretations of, the provisions of those programs and any outstanding options
or stock issuances thereunder as it may deem necessary or advisable. Decisions
of the Plan Administrator within the scope of its administrative functions under
the Plan shall be final and binding on all parties who have an interest in the
Discretionary Option Grant and Stock Issuance Programs under its jurisdiction or
any stock option or stock issuance thereunder.

                  D. The Primary Committee shall have the sole and exclusive
authority to determine which Section 16 Insiders and other highly compensated
Employees shall be eligible for participation in the Salary Investment Option
Grant Program for one or more calendar years. However, all option grants under
the Salary Investment Option Grant Program shall be made in accordance with the
express terms of that program, and the Primary Committee shall not exercise any
discretionary functions with respect to the option grants made under that
program.

                  E. Service on the Primary Committee or the Secondary Committee
shall constitute service as a Board member, and members of each such committee
shall accordingly be entitled to full indemnification and reimbursement as Board
members for their service on such committee. No member of the Primary Committee
or the Secondary Committee shall be liable for any act or omission made in good
faith with respect to the Plan or any option grants or stock issuances under the
Plan.


                                       2
<PAGE>   4

                  F. Administration of the Automatic Option Grant and Director
Fee Option Grant Programs shall be self-executing in accordance with the terms
of those programs, and no Plan Administrator shall exercise any discretionary
functions with respect to any option grants or stock issuances made under those
programs.

         IV.      ELIGIBILITY

                  A. The persons eligible to participate in the Discretionary
Option Grant and Stock Issuance Programs are as follows:

                         (i) Employees,

                         (ii) non-employee members of the Board or the board of
         directors of any Parent or Subsidiary, and

                         (iii) consultants and other independent advisors who
         provide services to the Corporation (or any Parent or Subsidiary).

                  B. Only Employees who are Section 16 Insiders or other highly
compensated individuals shall be eligible to participate in the Salary
Investment Option Grant Program.

                  C. Each Plan Administrator shall, within the scope of its
administrative jurisdiction under the Plan, have full authority to determine,
(i) with respect to the option grants under the Discretionary Option Grant
Program, which eligible persons are to receive such grants, the time or times
when those grants are to be made, the number of shares to be covered by each
such grant, the status of the granted option as either an Incentive Option or a
Non-Statutory Option, the time or times when each option is to become
exercisable, the vesting schedule (if any) applicable to the option shares and
the maximum term for which the option is to remain outstanding and (ii) with
respect to stock issuances under the Stock Issuance Program, which eligible
persons are to receive such issuances, the time or times when the issuances are
to be made, the number of shares to be issued to each Participant, the vesting
schedule (if any) applicable to the issued shares and the consideration for such
shares.

                  D. The Plan Administrator shall have the absolute discretion
either to grant options in accordance with the Discretionary Option Grant
Program or to effect stock issuances in accordance with the Stock Issuance
Program.

                  E. The individuals who shall be eligible to participate in the
Automatic Option Grant Program shall be limited to (i) those individuals who
first become non-employee Board members on or after the Underwriting Date,
whether through appointment by the Board or election by the Corporation's
stockholders, and (ii) those individuals who continue to serve as non-employee
Board members at one or more Annual Stockholders Meetings held after the
Underwriting Date. A non-employee Board member who has previously been in the
employ of the Corporation (or any Parent or Subsidiary) shall not be eligible to
receive an option grant


                                       3
<PAGE>   5
under the Automatic Option Grant Program at the time he or she first becomes a
non-employee Board member, but shall be eligible to receive periodic option
grants under the Automatic Option Grant Program while he or she continues to
serve as a non-employee Board member.

                  F. All non-employee Board members shall be eligible to
participate in the Director Fee Option Grant Program.

         V.       STOCK SUBJECT TO THE PLAN

                  A. The stock issuable under the Plan shall be shares of
authorized but unissued or reacquired Common Stock, including shares repurchased
by the Corporation on the open market. The number of shares of Common Stock
initially reserved for issuance over the term of the Plan shall not exceed
3,635,832 shares. Such reserve shall consist of (i) the number of shares
estimated to remain available for issuance, as of the Plan Effective Date, under
the Predecessor Plan as last approved by the Corporation's stockholders,
including the shares subject to outstanding options under the Predecessor Plan,
(ii) plus an additional increase of approximately 1,599,960 shares to be
approved by the Corporation's stockholders prior to the Underwriting Date.

                  B. The number of shares of Common Stock available for issuance
under the Plan shall automatically increase on the first trading day of each
fiscal year of the Corporation during the term of the Plan, beginning with
fiscal year 2001, by an amount equal to three and one-half percent (3.5%) of the
total number of shares of Common Stock outstanding on the last trading day of
the immediately preceding fiscal year, but in no event shall any such annual
increase exceed 2,000,000 shares.

                  C. No one person participating in the Plan may receive stock
options, separately exercisable stock appreciation rights and direct stock
issuances for more than 2,000,000 shares of Common Stock in the aggregate per
calendar year.

                  D. Shares of Common Stock subject to outstanding options
(including options incorporated into this Plan from the Predecessor Plan) shall
be available for subsequent issuance under the Plan to the extent (i) those
options expire or terminate for any reason prior to exercise in full or (ii) the
options are cancelled in accordance with the cancellation-regrant provisions of
Article Two. Unvested shares issued under the Plan and subsequently cancelled or
repurchased by the Corporation at the original issue price paid per share,
pursuant to the Corporation's repurchase rights under the Plan shall be added
back to the number of shares of Common Stock reserved for issuance under the
Plan and shall accordingly be available for reissuance through one or more
subsequent option grants or direct stock issuances under the Plan. However,
should the exercise price of an option under the Plan be paid with shares of
Common Stock or should shares of Common Stock otherwise issuable under the Plan
be withheld by the Corporation in satisfaction of the withholding taxes incurred
in connection with the exercise of an option or the vesting of a stock issuance
under the Plan, then the number of shares of Common Stock available for issuance
under the Plan shall be reduced by the gross number of shares for which the
option is exercised or which vest under the stock issuance, and not by the net
number of shares of Common Stock issued to the holder of such option or stock


                                       4
<PAGE>   6
issuance. Shares of Common Stock underlying one or more stock appreciation
rights exercised under Section IV of Article Two, Section III of Article Three,
Section II of Article Five or Section III of Article Six of the Plan shall NOT
be available for subsequent issuance under the Plan.

                  E. If any change is made to the Common Stock by reason of any
stock split, stock dividend, recapitalization, combination of shares, exchange
of shares or other change affecting the outstanding Common Stock as a class
without the Corporation's receipt of consideration, appropriate adjustments
shall be made by the Plan Administrator to (i) the maximum number and/or class
of securities issuable under the Plan, (ii) the maximum number and/or class of
securities for which any one person may be granted stock options, separately
exercisable stock appreciation rights and direct stock issuances under the Plan
per calendar year, (iii) the number and/or class of securities for which grants
are subsequently to be made under the Automatic Option Grant Program to new and
continuing non-employee Board members, (iv) the number and/or class of
securities and the exercise price per share in effect under each outstanding
option under the Plan, (v) the number and/or class of securities and exercise
price per share in effect under each outstanding option incorporated into this
Plan from the Predecessor Plan and (vi) the maximum number and/or class of
securities by which the share reserve is to increase automatically each fiscal
year pursuant to the provisions of Section V.B of this Article One. Such
adjustments to the outstanding options are to be effected in a manner which
shall preclude the enlargement or dilution of rights and benefits under such
options. The adjustments determined by the Plan Administrator shall be final,
binding and conclusive.


                                       5
<PAGE>   7
                                   ARTICLE TWO

                       DISCRETIONARY OPTION GRANT PROGRAM

         I.       OPTION TERMS

                  Each option shall be evidenced by one or more documents in the
form approved by the Plan Administrator; provided, however, that each such
document shall comply with the terms specified below. Each document evidencing
an Incentive Option shall, in addition, be subject to the provisions of the Plan
applicable to such options.

                  A.       EXERCISE PRICE.

                           1. The exercise price per share shall be fixed by the
Plan Administrator but shall not be less than one hundred percent (100%) of the
Fair Market Value per share of Common Stock on the option grant date.

                           2. The exercise price shall become immediately due
upon exercise of the option and shall, subject to the provisions of Section I of
Article Seven and the documents evidencing the option, be payable in one or more
of the forms specified below:

                         (i) cash or check made payable to the Corporation,

                         (ii) shares of Common Stock held for the requisite
         period necessary to avoid a charge to the Corporation's earnings for
         financial reporting purposes and valued at Fair Market Value on the
         Exercise Date, or

                         (iii) to the extent the option is exercised for vested
         shares, through a special sale and remittance procedure pursuant to
         which the Optionee shall concurrently provide irrevocable instructions
         to (a) a Corporation-designated brokerage firm to effect the immediate
         sale of the purchased shares and remit to the Corporation, out of the
         sale proceeds available on the settlement date, sufficient funds to
         cover the aggregate exercise price payable for the purchased shares
         plus all applicable Federal, state and local income and employment
         taxes required to be withheld by the Corporation by reason of such
         exercise and (b) the Corporation to deliver the certificates for the
         purchased shares directly to such brokerage firm in order to complete
         the sale.

                  Except to the extent such sale and remittance procedure is
utilized, payment of the exercise price for the purchased shares must be made on
the Exercise Date.


                                       6
<PAGE>   8
                           B. EXERCISE AND TERM OF OPTIONS. Each option shall be
exercisable at such time or times, during such period and for such number of
shares as shall be determined by the Plan Administrator and set forth in the
documents evidencing the option. However, no option shall have a term in excess
of ten (10) years measured from the option grant date.

                           C. EFFECT OF TERMINATION OF SERVICE.

                              1. The following provisions shall govern the
exercise of any options held by the Optionee at the time of cessation of Service
or death:

                                    (i) Any option outstanding at the time of
         the Optionee's cessation of Service for any reason shall remain
         exercisable for such period of time thereafter as shall be determined
         by the Plan Administrator and set forth in the documents evidencing the
         option, but no such option shall be exercisable after the expiration of
         the option term.

                                    (ii) Any option held by the Optionee at the
         time of death and exercisable in whole or in part at that time may be
         subsequently exercised by the personal representative of the Optionee's
         estate or by the person or persons to whom the option is transferred
         pursuant to the Optionee's will or the laws of inheritance or by the
         Optionee's designated beneficiary or beneficiaries of that option.

                                    (iii) Should the Optionee's Service be
         terminated for Misconduct or should the Optionee otherwise engage in
         Misconduct while holding one or more outstanding options under this
         Article Two, then all those options shall terminate immediately and
         cease to be outstanding.

                                    (iv) During the applicable post-Service
         exercise period, the option may not be exercised in the aggregate for
         more than the number of vested shares for which the option is
         exercisable on the date of the Optionee's cessation of Service. Upon
         the expiration of the applicable exercise period or (if earlier) upon
         the expiration of the option term, the option shall terminate and cease
         to be outstanding for any vested shares for which the option has not
         been exercised. However, the option shall, immediately upon the
         Optionee's cessation of Service, terminate and cease to be outstanding
         to the extent the option is not otherwise at that time exercisable for
         vested shares.

                           2. The Plan Administrator shall have complete
discretion, exercisable either at the time an option is granted or at any time
while the option remains outstanding, to:

                                    (i) extend the period of time for which the
         option is to remain exercisable following the Optionee's cessation of
         Service from the limited exercise period otherwise in effect for that
         option to such greater period of time as the Plan Administrator shall
         deem appropriate, but in no event beyond the expiration of the option
         term, and/or


                                       7
<PAGE>   9
                                    (ii) permit the option to be exercised,
         during the applicable post-Service exercise period, not only with
         respect to the number of vested shares of Common Stock for which such
         option is exercisable at the time of the Optionee's cessation of
         Service but also with respect to one or more additional installments in
         which the Optionee would have vested had the Optionee continued in
         Service.

                  D. STOCKHOLDER RIGHTS. The holder of an option shall have no
stockholder rights with respect to the shares subject to the option until such
person shall have exercised the option, paid the exercise price and become a
holder of record of the purchased shares.

                  E. REPURCHASE RIGHTS. The Plan Administrator shall have the
discretion to grant options which are exercisable for unvested shares of Common
Stock. Should the Optionee cease Service while holding such unvested shares, the
Corporation shall have the right to repurchase, at the exercise price paid per
share, any or all of those unvested shares. The terms upon which such repurchase
right shall be exercisable (including the period and procedure for exercise and
the appropriate vesting schedule for the purchased shares) shall be established
by the Plan Administrator and set forth in the document evidencing such
repurchase right.

                  F. LIMITED TRANSFERABILITY OF OPTIONS. During the lifetime of
the Optionee, Incentive Options shall be exercisable only by the Optionee and
shall not be assignable or transferable other than by will or the laws of
inheritance following the Optionee's death. Non-Statutory Options shall be
subject to the same restriction, except that a Non-Statutory Option may be
assigned in whole or in part during the Optionee's lifetime to one or more
members of the Optionee's family or to a trust established exclusively for one
or more such family members or to Optionee's former spouse, to the extent such
assignment is in connection with the Optionee's estate plan or pursuant to a
domestic relations order. The assigned portion may only be exercised by the
person or persons who acquire a proprietary interest in the option pursuant to
the assignment. The terms applicable to the assigned portion shall be the same
as those in effect for the option immediately prior to such assignment and shall
be set forth in such documents issued to the assignee as the Plan Administrator
may deem appropriate. Notwithstanding the foregoing, the Optionee may also
designate one or more persons as the beneficiary or beneficiaries of his or her
outstanding options under this Article Two, and those options shall, in
accordance with such designation, automatically be transferred to such
beneficiary or beneficiaries upon the Optionee's death while holding those
options. Such beneficiary or beneficiaries shall take the transferred options
subject to all the terms and conditions of the applicable agreement evidencing
each such transferred option, including (without limitation) the limited time
period during which the option may be exercised following the Optionee's death.

         II.      INCENTIVE OPTIONS

                  The terms specified below shall be applicable to all Incentive
Options. Except as modified by the provisions of this Section II, all the
provisions of Articles One, Two and Seven shall be applicable to Incentive
Options. Options which are specifically designated as Non-Statutory Options when
issued under the Plan shall not be subject to the terms of this Section II.


                                       8
<PAGE>   10
                  A. ELIGIBILITY. Incentive Options may only be granted to
Employees.

                  B. DOLLAR LIMITATION. The aggregate Fair Market Value of the
shares of Common Stock (determined as of the respective date or dates of grant)
for which one or more options granted to any Employee under the Plan (or any
other option plan of the Corporation or any Parent or Subsidiary) may for the
first time become exercisable as Incentive Options during any one calendar year
shall not exceed the sum of One Hundred Thousand Dollars ($100,000). To the
extent the Employee holds two (2) or more such options which become exercisable
for the first time in the same calendar year, the foregoing limitation on the
exercisability of such options as Incentive Options shall be applied on the
basis of the order in which such options are granted.

                  C. 10% STOCKHOLDER. If any Employee to whom an Incentive
Option is granted is a 10% Stockholder, then the exercise price per share shall
not be less than one hundred ten percent (110%) of the Fair Market Value per
share of Common Stock on the option grant date, and the option term shall not
exceed five (5) years measured from the option grant date.

         III.     CORPORATE TRANSACTION/CHANGE IN CONTROL

                  A. In the event of any Corporate Transaction, each outstanding
option shall automatically accelerate so that each such option shall,
immediately prior to the effective date of the Corporate Transaction, become
exercisable for all the shares of Common Stock at the time subject to such
option and may be exercised for any or all of those shares as fully vested
shares of Common Stock. However, an outstanding option shall NOT become
exercisable on such an accelerated basis if and to the extent: (i) such option
is, in connection with the Corporate Transaction, to be assumed by the successor
corporation (or parent thereof) or (ii) such option is to be replaced with a
cash incentive program of the successor corporation which preserves the spread
existing at the time of the Corporate Transaction on any shares for which the
option is not otherwise at that time exercisable and provides for subsequent
payout in accordance with the same exercise/vesting schedule applicable to those
option shares or (iii) the acceleration of such option is subject to other
limitations imposed by the Plan Administrator at the time of the option grant.

                  B. All outstanding repurchase rights shall automatically
terminate, and the shares of Common Stock subject to those terminated rights
shall immediately vest in full, in the event of any Corporate Transaction,
except to the extent: (i) those repurchase rights are to be assigned to the
successor corporation (or parent thereof) in connection with such Corporate
Transaction or (ii) such accelerated vesting is precluded by other limitations
imposed by the Plan Administrator at the time the repurchase right is issued.

                  C. Immediately following the consummation of the Corporate
Transaction, all outstanding options shall terminate and cease to be
outstanding, except to the extent assumed by the successor corporation (or
parent thereof).


                                       9
<PAGE>   11
                  D. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments to reflect such Corporate Transaction shall also be made
to (i) the exercise price payable per share under each outstanding option,
provided the aggregate exercise price payable for such securities shall remain
the same, (ii) the maximum number and/or class of securities available for
issuance over the remaining term of the Plan and (iii) the maximum number and/or
class of securities for which any one person may be granted stock options,
separately exercisable stock appreciation rights and direct stock issuances
under the Plan per calendar year and (iv) the maximum number and/or class of
securities by which the share reserve is to increase automatically each fiscal
year. To the extent the actual holders of the Corporation's outstanding Common
Stock receive cash consideration for their Common Stock in consummation of the
Corporate Transaction, the successor corporation may, in connection with the
assumption of the outstanding options under the Discretionary Option Grant
Program, substitute one or more shares of its own common stock with a fair
market value equivalent to the cash consideration paid per share of Common Stock
in such Corporate Transaction.

                  E. The Plan Administrator shall have the discretionary
authority to structure one or more outstanding options under the Discretionary
Option Grant Program so that those options shall, immediately prior to the
effective date of such Corporate Transaction, become exercisable for all the
shares of Common Stock at the time subject to those options and may be exercised
for any or all of those shares as fully vested shares of Common Stock, whether
or not those options are to be assumed in the Corporate Transaction. In
addition, the Plan Administrator shall have the discretionary authority to
structure one or more of the Corporation's repurchase rights under the
Discretionary Option Grant Program so that those rights shall not be assignable
in connection with such Corporate Transaction and shall accordingly terminate
upon the consummation of such Corporate Transaction, and the shares subject to
those terminated rights shall thereupon vest in full.

                  F. The Plan Administrator shall have full power and authority
to structure one or more outstanding options under the Discretionary Option
Grant Program so that those options shall become exercisable for all the shares
of Common Stock at the time subject to those options in the event the Optionee's
Service is subsequently terminated by reason of an Involuntary Termination
within a designated period (not to exceed eighteen (18) months) following the
effective date of any Corporate Transaction in which those options are assumed
and do not otherwise accelerate. In addition, the Plan Administrator may
structure one or more of the Corporation's repurchase rights so that those
rights shall immediately terminate with respect to any shares held by the
Optionee at the time of his or her Involuntary Termination, and the shares
subject to those terminated repurchase rights shall accordingly vest in full at
that time.


                                       10
<PAGE>   12
                  G. The Plan Administrator shall have the discretionary
authority to structure one or more outstanding options under the Discretionary
Option Grant Program so that those options shall, immediately prior to the
effective date of a Change in Control, become exercisable for all the shares of
Common Stock at the time subject to those options and may be exercised for any
or all of those shares as fully vested shares of Common Stock. In addition, the
Plan Administrator shall have the discretionary authority to structure one or
more of the Corporation's repurchase rights under the Discretionary Option Grant
Program so that those rights shall terminate automatically upon the consummation
of such Change in Control, and the shares subject to those terminated rights
shall thereupon vest in full. Alternatively, the Plan Administrator may
condition the automatic acceleration of one or more outstanding options under
the Discretionary Option Grant Program and the termination of one or more of the
Corporation's outstanding repurchase rights under such program upon the
subsequent termination of the Optionee's Service by reason of an Involuntary
Termination within a designated period (not to exceed eighteen (18) months)
following the effective date of such Change in Control.

                  H. The portion of any Incentive Option accelerated in
connection with a Corporate Transaction or Change in Control shall remain
exercisable as an Incentive Option only to the extent the applicable One Hundred
Thousand Dollar ($100,000) limitation is not exceeded. To the extent such dollar
limitation is exceeded, the accelerated portion of such option shall be
exercisable as a Nonstatutory Option under the Federal tax laws.

                  I. The outstanding options shall in no way affect the right of
the Corporation to adjust, reclassify, reorganize or otherwise change its
capital or business structure or to merge, consolidate, dissolve, liquidate or
sell or transfer all or any part of its business or assets.

         IV.      CANCELLATION AND REGRANT OF OPTIONS

                  The Plan Administrator shall have the authority to effect, at
any time and from time to time, with the consent of the affected option holders,
the cancellation of any or all outstanding options under the Discretionary
Option Grant Program (including outstanding options incorporated from the
Predecessor Plan) and to grant in substitution new options covering the same or
a different number of shares of Common Stock but with an exercise price per
share based on the Fair Market Value per share of Common Stock on the new grant
date.

         V.       STOCK APPRECIATION RIGHTS

                  A. The Plan Administrator shall have full power and authority
to grant to selected Optionees tandem stock appreciation rights and/or limited
stock appreciation rights.

                  B. The following terms shall govern the grant and exercise of
tandem stock appreciation rights:

                                    (i) One or more Optionees may be granted the
         right, exercisable upon such terms as the Plan Administrator may
         establish, to elect between the exercise of the underlying option for
         shares of Common Stock and


                                       11
<PAGE>   13
         the surrender of that option in exchange for a distribution from the
         Corporation in an amount equal to the excess of (a) the Fair Market
         Value (on the option surrender date) of the number of shares in which
         the Optionee is at the time vested under the surrendered option (or
         surrendered portion thereof) over (b) the aggregate exercise price
         payable for such shares.

                                    (ii) No such option surrender shall be
         effective unless it is approved by the Plan Administrator, either at
         the time of the actual option surrender or at any earlier time. If the
         surrender is so approved, then the distribution to which the Optionee
         shall be entitled may be made in shares of Common Stock valued at Fair
         Market Value on the option surrender date, in cash, or partly in shares
         and partly in cash, as the Plan Administrator shall in its sole
         discretion deem appropriate.

                                    (iii) If the surrender of an option is not
         approved by the Plan Administrator, then the Optionee shall retain
         whatever rights the Optionee had under the surrendered option (or
         surrendered portion thereof) on the option surrender date and may
         exercise such rights at any time prior to the later of (a) five (5)
         business days after the receipt of the rejection notice or (b) the last
         day on which the option is otherwise exercisable in accordance with the
         terms of the documents evidencing such option, but in no event may such
         rights be exercised more than ten (10) years after the option grant
         date.

                  C. The following terms shall govern the grant and exercise of
limited stock appreciation rights:

                                    (i) One or more Section 16 Insiders may be
         granted limited stock appreciation rights with respect to their
         outstanding options.

                                    (ii) Upon the occurrence of a Hostile
         Take-Over, each individual holding one or more options with such a
         limited stock appreciation right shall have the unconditional right
         (exercisable for a thirty (30)-day period following such Hostile
         Take-Over) to surrender each such option to the Corporation. In return
         for the surrendered option, the Optionee shall receive a cash
         distribution from the Corporation in an amount equal to the excess of
         (A) the Take-Over Price of the shares of Common Stock at the time
         subject to such option (whether or not the option is otherwise at that
         time exercisable for those shares) over (B) the aggregate exercise
         price payable for those shares. Such cash distribution shall be paid
         within five (5) days following the option surrender date.

                                    (iii) At the time such limited stock
         appreciation right is granted, the Plan Administrator shall pre-approve
         any subsequent exercise of that right in accordance with the terms of
         this Paragraph C. Accordingly, no further approval of the Plan
         Administrator or the Board shall be required at the time of the actual
         option surrender and cash distribution.


                                       12
<PAGE>   14
                                  ARTICLE THREE

                     SALARY INVESTMENT OPTION GRANT PROGRAM


         I.       OPTION GRANTS

                  The Primary Committee shall have the sole and exclusive
authority to determine the calendar year or years (if any) for which the Salary
Investment Option Grant Program is to be in effect and to select the Section 16
Insiders and other highly compensated Employees eligible to participate in the
Salary Investment Option Grant Program for such calendar year or years. Each
selected individual who elects to participate in the Salary Investment Option
Grant Program must, prior to the start of each calendar year of participation,
file with the Plan Administrator (or its designate) an irrevocable authorization
directing the Corporation to reduce his or her base salary for that calendar
year by an amount not less than Ten Thousand Dollars ($10,000.00) nor more than
Fifty Thousand Dollars ($50,000.00). Each individual who files such a timely
authorization shall automatically be granted an option under the Salary
Investment Grant Program on the first trading day in January of the calendar
year for which the salary reduction is to be in effect.

         II.      OPTION TERMS

                  Each option shall be a Non-Statutory Option evidenced by one
or more documents in the form approved by the Plan Administrator; provided,
however, that each such document shall comply with the terms specified below.

                  A. EXERCISE PRICE.

                           1. The exercise price per share shall be thirty-three
and one-third percent (33-1/3%) of the Fair Market Value per share of Common
Stock on the option grant date.

                           2. The exercise price shall become immediately due
upon exercise of the option and shall be payable in one or more of the
alternative forms authorized under the Discretionary Option Grant Program.
Except to the extent the sale and remittance procedure specified thereunder is
utilized, payment of the exercise price for the purchased shares must be made on
the Exercise Date.

                  B. NUMBER OF OPTION SHARES. The number of shares of Common
Stock subject to the option shall be determined pursuant to the following
formula (rounded down to the nearest whole number):


                           X = A / (B x 66-2/3%), where

                           X is the number of option shares,


                                       13
<PAGE>   15
                           A is the dollar amount by which the Optionee's base
                  salary is to be reduced for the calendar year pursuant to his
                  or her election under the Salary Investment Option Grant
                  Program, and

                           B is the Fair Market Value per share of Common Stock
                  on the option grant date.

                  C. EXERCISE AND TERM OF OPTIONS. The option shall become
exercisable in a series of twelve (12) successive equal monthly installments
upon the Optionee's completion of each calendar month of Service in the calendar
year for which the salary reduction is in effect. Each option shall have a
maximum term of ten (10) years measured from the option grant date.

                  D. EFFECT OF TERMINATION OF SERVICE. Should the Optionee cease
Service for any reason while holding one or more options under this Article
Three, then each such option shall remain exercisable, for any or all of the
shares for which the option is exercisable at the time of such cessation of
Service, until the earlier of (i) the expiration of the ten (10)-year option
term or (ii) the expiration of the three (3)-year period measured from the date
of such cessation of Service. Should the Optionee die while holding one or more
options under this Article Three, then each such option may be exercised, for
any or all of the shares for which the option is exercisable at the time of the
Optionee's cessation of Service (less any shares subsequently purchased by
Optionee prior to death), by the personal representative of the Optionee's
estate or by the person or persons to whom the option is transferred pursuant to
the Optionee's will or the laws of inheritance or by the designated beneficiary
or beneficiaries of the option. Such right of exercise shall lapse, and the
option shall terminate, upon the earlier of (i) the expiration of the ten
(10)-year option term or (ii) the three (3)-year period measured from the date
of the Optionee's cessation of Service. However, the option shall, immediately
upon the Optionee's cessation of Service for any reason, terminate and cease to
remain outstanding with respect to any and all shares of Common Stock for which
the option is not otherwise at that time exercisable.

         III.     CORPORATE TRANSACTION/CHANGE IN CONTROL/HOSTILE TAKE-OVER

                  A. In the event of any Corporate Transaction while the
Optionee remains in Service, each outstanding option held by such Optionee under
this Salary Investment Option Grant Program shall automatically accelerate so
that each such option shall, immediately prior to the effective date of the
Corporate Transaction, become exercisable for all the shares of Common Stock at
the time subject to such option and may be exercised for any or all of those
shares as fully vested shares of Common Stock. Each such outstanding option
shall terminate immediately following the Corporate Transaction, except to the
extent assumed by the successor corporation (or parent thereof) in such
Corporate Transaction. Any option so assumed and shall remain exercisable for
the fully vested shares until the earlier of (i) the expiration of the ten
(10)-year option term or (ii) the expiration of the three (3)-year period
measured from the date of the Optionee's cessation of Service.


                                       14
<PAGE>   16
                  B. In the event of a Change in Control while the Optionee
remains in Service, each outstanding option held by such Optionee under this
Salary Investment Option Grant Program shall automatically accelerate so that
each such option shall, immediately prior to the effective date of the Change in
Control, become exercisable for all the shares of Common Stock at the time
subject to such option and may be exercised for any or all of those shares as
fully vested shares of Common Stock. The option shall remain so exercisable
until the earliest to occur of (i) the expiration of the ten (10)-year option
term, (ii) the expiration of the three (3)-year period measured from the date of
the Optionee's cessation of Service, (iii) the termination of the option in
connection with a Corporate Transaction or (iv) the surrender of the option in
connection with a Hostile Take-Over.

                  C. Upon the occurrence of a Hostile Take-Over, the Optionee
shall have a thirty (30)-day period in which to surrender to the Corporation
each outstanding option granted him or her under the Salary Investment Option
Grant Program. The Optionee shall in return be entitled to a cash distribution
from the Corporation in an amount equal to the excess of (i) the Take-Over Price
of the shares of Common Stock at the time subject to the surrendered option
(whether or not the option is otherwise at the time exercisable for those
shares) over (ii) the aggregate exercise price payable for such shares. Such
cash distribution shall be paid within five (5) days following the surrender of
the option to the Corporation. The Primary Committee shall, at the time the
option with such limited stock appreciation right is granted under the Salary
Investment Option Grant Program, pre-approve any subsequent exercise of that
right in accordance with the terms of this Paragraph C. Accordingly, no further
approval of the Primary Committee or the Board shall be required at the time of
the actual option surrender and cash distribution.

                  D. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Salary Investment Option Grant Program, substitute one or more
shares of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

                  E. The grant of options under the Salary Investment Option
Grant Program shall in no way affect the right of the Corporation to adjust,
reclassify, reorganize or otherwise change its capital or business structure or
to merge, consolidate, dissolve, liquidate or sell or transfer all or any part
of its business or assets.


                                       15
<PAGE>   17
         IV.      REMAINING TERMS

                  The remaining terms of each option granted under the Salary
Investment Option Grant Program shall be the same as the terms in effect for
option grants made under the Discretionary Option Grant Program.


                                       16
<PAGE>   18
                                  ARTICLE FOUR

                             STOCK ISSUANCE PROGRAM


         I.       STOCK ISSUANCE TERMS

                  Shares of Common Stock may be issued under the Stock Issuance
Program through direct and immediate issuances without any intervening option
grants. Each such stock issuance shall be evidenced by a Stock Issuance
Agreement which complies with the terms specified below. Shares of Common Stock
may also be issued under the Stock Issuance Program pursuant to share right
awards which entitle the recipients to receive those shares upon the attainment
of designated performance goals.

                  A. PURCHASE PRICE.

                           1. The purchase price per share shall be fixed by the
Plan Administrator, but shall not be less than one hundred percent (100%) of the
Fair Market Value per share of Common Stock on the issuance date.

                           2. Subject to the provisions of Section I of Article
Seven, shares of Common Stock may be issued under the Stock Issuance Program for
any of the following items of consideration which the Plan Administrator may
deem appropriate in each individual instance:

                                    (i) cash or check made payable to the
         Corporation, or

                                    (ii) past services rendered to the
         Corporation (or any Parent or Subsidiary).

                  B. VESTING PROVISIONS.

                           1. Shares of Common Stock issued under the Stock
Issuance Program may, in the discretion of the Plan Administrator, be fully and
immediately vested upon issuance or may vest in one or more installments over
the Participant's period of Service or upon attainment of specified performance
objectives. The elements of the vesting schedule applicable to any unvested
shares of Common Stock issued under the Stock Issuance Program shall be
determined by the Plan Administrator and incorporated into the Stock Issuance
Agreement. Shares of Common Stock may also be issued under the Stock Issuance
Program pursuant to share right awards which entitle the recipients to receive
those shares upon the attainment of designated performance goals.

                           2. Any new, substituted or additional securities or
other property (including money paid other than as a regular cash dividend)
which the Participant may have the right to receive with respect to the
Participant's unvested shares of Common Stock by reason of any stock dividend,
stock split, recapitalization, combination of shares, exchange of shares or


                                       17
<PAGE>   19
other change affecting the outstanding Common Stock as a class without the
Corporation's receipt of consideration shall be issued subject to (i) the same
vesting requirements applicable to the Participant's unvested shares of Common
Stock and (ii) such escrow arrangements as the Plan Administrator shall deem
appropriate.

                           3. The Participant shall have full stockholder rights
with respect to any shares of Common Stock issued to the Participant under the
Stock Issuance Program, whether or not the Participant's interest in those
shares is vested. Accordingly, the Participant shall have the right to vote such
shares and to receive any regular cash dividends paid on such shares.

                           4. Should the Participant cease to remain in Service
while holding one or more unvested shares of Common Stock issued under the Stock
Issuance Program or should the performance objectives not be attained with
respect to one or more such unvested shares of Common Stock, then those shares
shall be immediately surrendered to the Corporation for cancellation, and the
Participant shall have no further stockholder rights with respect to those
shares. To the extent the surrendered shares were previously issued to the
Participant for consideration paid in cash or cash equivalent (including the
Participant's purchase-money indebtedness), the Corporation shall repay to the
Participant the cash consideration paid for the surrendered shares and shall
cancel the unpaid principal balance of any outstanding purchase-money note of
the Participant attributable to the surrendered shares.

                           5. The Plan Administrator may in its discretion waive
the surrender and cancellation of one or more unvested shares of Common Stock
which would otherwise occur upon the cessation of the Participant's Service or
the non-attainment of the performance objectives applicable to those shares.
Such waiver shall result in the immediate vesting of the Participant's interest
in the shares of Common Stock as to which the waiver applies. Such waiver may be
effected at any time, whether before or after the Participant's cessation of
Service or the attainment or non-attainment of the applicable performance
objectives.

                           6. Outstanding share right awards under the Stock
Issuance Program shall automatically terminate, and no shares of Common Stock
shall actually be issued in satisfaction of those awards, if the performance
goals established for such awards are not attained. The Plan Administrator,
however, shall have the discretionary authority to issue shares of Common Stock
under one or more outstanding share right awards as to which the designated
performance goals have not been attained.

         II.      CORPORATE TRANSACTION/CHANGE IN CONTROL

                  A. All of the Corporation's outstanding repurchase rights
under the Stock Issuance Program shall terminate automatically, and all the
shares of Common Stock subject to those terminated rights shall immediately vest
in full, in the event of any Corporate Transaction, except to the extent (i)
those repurchase rights are to be assigned to the successor corporation (or
parent thereof) in connection with such Corporate Transaction or (ii) such
accelerated vesting is precluded by other limitations imposed in the Stock
Issuance Agreement.


                                       18
<PAGE>   20
                  B. The Plan Administrator shall have the discretionary
authority to structure one or more of the Corporation's repurchase rights under
the Stock Issuance Program so that those rights shall automatically terminate in
whole or in part, and the shares of Common Stock subject to those terminated
rights shall immediately vest, in the event the Participant's Service should
subsequently terminate by reason of an Involuntary Termination within a
designated period (not to exceed eighteen (18) months) following the effective
date of any Corporate Transaction in which those repurchase rights are assigned
to the successor corporation (or parent thereof).

                  C. The Plan Administrator shall also have the discretionary
authority to structure one or more of the Corporation's repurchase rights under
the Stock Issuance Program so that those rights shall automatically terminate in
whole or in part, and the shares of Common Stock subject to those terminated
rights shall immediately vest, in the event the Participant's Service should
subsequently terminate by reason of an Involuntary Termination within a
designated period (not to exceed eighteen (18) months) following the effective
date of any Change in Control.

         III.     SHARE ESCROW/LEGENDS

         Unvested shares may, in the Plan Administrator's discretion, be held in
escrow by the Corporation until the Participant's interest in such shares vests
or may be issued directly to the Participant with restrictive legends on the
certificates evidencing those unvested shares.


                                       19
<PAGE>   21
                                  ARTICLE FIVE

                         AUTOMATIC OPTION GRANT PROGRAM

         I.       OPTION TERMS

                  A. GRANT DATES. Option grants shall be made on the dates
specified below:

                           1. Each individual who is first elected or appointed
as a non-employee Board member at any time on or after the Underwriting Date
shall automatically be granted, on the date of such initial election or
appointment, a Non-Statutory Option to purchase 50,000 shares of Common Stock,
provided that individual has not previously been in the employ of the
Corporation or any Parent or Subsidiary.

                           2. On the date of each Annual Stockholders Meeting
held after the Underwriting Date, each individual who is to continue to serve as
a non-employee Board member, whether or not that individual is standing for
re-election to the Board at that particular Annual Meeting, shall automatically
be granted a Non-Statutory Option to purchase 10,000 shares of Common Stock,
provided such individual has served as a non-employee Board member for at least
six (6) months. There shall be no limit on the number of such 10,000-share
option grants any one non-employee Board member may receive over his or her
period of Board service, and non-employee Board members who have previously been
in the employ of the Corporation (or any Parent or Subsidiary) or who have
otherwise received one or more stock option grants from the Corporation prior to
the Underwriting Date shall be eligible to receive one or more such annual
option grants over their period of continued Board service.

                  B. EXERCISE PRICE.

                           1. The exercise price per share shall be equal to one
hundred percent (100%) of the Fair Market Value per share of Common Stock on the
option grant date.

                           2. The exercise price shall be payable in one or more
of the alternative forms authorized under the Discretionary Option Grant
Program. Except to the extent the sale and remittance procedure specified
thereunder is utilized, payment of the exercise price for the purchased shares
must be made on the Exercise Date.

                  C. OPTION TERM. Each option shall have a term of ten (10)
years measured from the option grant date.

                  D. EXERCISE AND VESTING OF OPTIONS. Each option shall be
immediately exercisable for any or all of the option shares. However, any
unvested shares purchased under the option shall be subject to repurchase by the
Corporation, at the exercise price paid per share, upon the Optionee's cessation
of Board service prior to vesting in those shares. The shares subject to each
initial 50,000-share grant shall vest, and the Corporation's repurchase right
shall


                                       20
<PAGE>   22
lapse, in a series of thirty-six (36) successive equal monthly installments upon
the Optionee's completion of each month of service as a Board member over the
thirty-six (36)-month period measured from the option grant date. The shares
subject to each annual 10,000-share option grant shall vest in a series of
twelve (12) successive equal monthly installments upon the Optionee's completion
of each month of service as a Board member over the twelve (12)-month month
period measured from the grant date.

                  E. LIMITED TRANSFERABILITY OF OPTIONS. Each option under this
Article Five may be assigned in whole or in part during the Optionee's lifetime
to one or more members of the Optionee's family or to a trust established
exclusively for one or more such family members or to Optionee's former spouse,
to the extent such assignment is in connection with the Optionee's estate plan
or pursuant to a domestic relations order. The assigned portion may only be
exercised by the person or persons who acquire a proprietary interest in the
option pursuant to the assignment. The terms applicable to the assigned portion
shall be the same as those in effect for the option immediately prior to such
assignment and shall be set forth in such documents issued to the assignee as
the Plan Administrator may deem appropriate. The Optionee may also designate one
or more persons as the beneficiary or beneficiaries of his or her outstanding
options under this Article Five, and those options shall, in accordance with
such designation, automatically be transferred to such beneficiary or
beneficiaries upon the Optionee's death while holding those options. Such
beneficiary or beneficiaries shall take the transferred options subject to all
the terms and conditions of the applicable agreement evidencing each such
transferred option, including (without limitation) the limited time period
during which the option may be exercised following the Optionee's death.

                  F. TERMINATION OF BOARD SERVICE. The following provisions
shall govern the exercise of any options held by the Optionee at the time the
Optionee ceases to serve as a Board member:

                                    (i) The Optionee (or, in the event of
         Optionee's death, the personal representative of the Optionee's estate
         or the person or persons to whom the option is transferred pursuant to
         the Optionee's will or the laws of inheritance or the designated
         beneficiary or beneficiaries of such option) shall have a twelve
         (12)-month period following the date of such cessation of Board service
         in which to exercise each such option.

                                    (ii) During the twelve (12)-month exercise
         period, the option may not be exercised in the aggregate for more than
         the number of vested shares of Common Stock for which the option is
         exercisable at the time of the Optionee's cessation of Board service.

                                    (iii) Should the Optionee cease to serve as
         a Board member by reason of death or Permanent Disability, then all
         shares at the time subject to the option shall immediately vest so that
         such option may, during the twelve (12)-month exercise period following
         such cessation of Board service, be exercised for all or any portion of
         those shares as fully vested shares of Common Stock.


                                       21
<PAGE>   23
                                    (iv) In no event shall the option remain
         exercisable after the expiration of the option term. Upon the
         expiration of the twelve (12)-month exercise period or (if earlier)
         upon the expiration of the option term, the option shall terminate and
         cease to be outstanding for any vested shares for which the option has
         not been exercised. However, the option shall, immediately upon the
         Optionee's cessation of Board service for any reason other than death
         or Permanent Disability, terminate and cease to be outstanding to the
         extent the option is not otherwise at that time exercisable for vested
         shares.

         II.      CORPORATE TRANSACTION/CHANGE IN CONTROL/HOSTILE TAKE-OVER

                  A. In the event of any Corporate Transaction while the
Optionee remains a Board member, the shares of Common Stock at the time subject
to each outstanding option under this Automatic Option Grant Program but not
otherwise vested shall automatically vest in full so that each such option
shall, immediately prior to the effective date of the Corporate Transaction,
become exercisable for all the option shares as fully vested shares of Common
Stock and may be exercised for any or all of those vested shares. Immediately
following the consummation of the Corporate Transaction, each automatic option
grant shall terminate and cease to be outstanding, except to the extent assumed
by the successor corporation (or parent thereof).

                  B. In connection with any Change in Control while the Optionee
remains a Board member, the shares of Common Stock at the time subject to each
outstanding option under this Automatic Option Grant Program but not otherwise
vested shall automatically vest in full so that each such option shall,
immediately prior to the effective date of the Change in Control, become
exercisable for all the option shares as fully vested shares of Common Stock and
may be exercised for any or all of those vested shares. Each such option shall
remain exercisable for such fully vested option shares until the expiration or
sooner termination of the option term or the surrender of the option in
connection with a Hostile Take-Over.

                  C. All outstanding repurchase rights under this Automatic
Option Grant Program shall automatically terminate, and the shares of Common
Stock subject to those terminated rights shall immediately vest in full, in the
event of any Corporate Transaction or Change in Control.

                  D. Upon the occurrence of a Hostile Take-Over, the Optionee
shall have a thirty (30)-day period in which to surrender to the Corporation
each of his or her outstanding options under this Automatic Option Grant
Program. The Optionee shall in return be entitled to a cash distribution from
the Corporation in an amount equal to the excess of (i) the Take-Over Price of
the shares of Common Stock at the time subject to each surrendered option
(whether or not the Optionee is otherwise at the time vested in those shares)
over (ii) the aggregate exercise price payable for such shares. Such cash
distribution shall be paid within five (5) days following the surrender of the
option to the Corporation. No approval or consent of the Board or any Plan
Administrator shall be required at the time of the actual option surrender and
cash distribution.


                                       22
<PAGE>   24
                  E. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Automatic Option Grant Program, substitute one or more shares
of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

                  F. The grant of options under the Automatic Option Grant
Program shall in no way affect the right of the Corporation to adjust,
reclassify, reorganize or otherwise change its capital or business structure or
to merge, consolidate, dissolve, liquidate or sell or transfer all or any part
of its business or assets.

         III.     REMAINING TERMS

                  The remaining terms of each option granted under the Automatic
Option Grant Program shall be the same as the terms in effect for option grants
made under the Discretionary Option Grant Program.


                                       23
<PAGE>   25
                                   ARTICLE SIX

                        DIRECTOR FEE OPTION GRANT PROGRAM

         I.       OPTION GRANTS

                  The Primary Committee shall have the sole and exclusive
authority to determine the calendar year or years for which the Director Fee
Option Grant Program is to be in effect. For each such calendar year the program
is in effect, each non-employee Board member may irrevocably elect to apply all
or any portion of the annual retainer fee otherwise payable in cash for his or
her service on the Board for that year to the acquisition of a special option
grant under this Director Fee Option Grant Program. Such election must be filed
with the Corporation's Chief Financial Officer prior to the first day of the
calendar year for which the annual retainer fee which is the subject of that
election is otherwise payable. Each non-employee Board member who files such a
timely election shall automatically be granted an option under this Director Fee
Option Grant Program on the first trading day in January in the calendar year
for which the annual retainer fee which is the subject of that election would
otherwise be payable in cash.

         II.      OPTION TERMS

                  Each option shall be a Non-Statutory Option governed by the
terms and conditions specified below.

                  A. EXERCISE PRICE.

                           1. The exercise price per share shall be thirty-three
and one-third percent (33-1/3%) of the Fair Market Value per share of Common
Stock on the option grant date.

                           2. The exercise price shall become immediately due
upon exercise of the option and shall be payable in one or more of the
alternative forms authorized under the Discretionary Option Grant Program.
Except to the extent the sale and remittance procedure specified thereunder is
utilized, payment of the exercise price for the purchased shares must be made on
the Exercise Date.

                           B. NUMBER OF OPTION SHARES. The number of shares of
Common Stock subject to the option shall be determined pursuant to the following
formula (rounded down to the nearest whole number):

                           X = A / (B x 66-2/3%), where

                           X is the number of option shares,

                           A is the portion of the annual retainer fee subject
                  to the non-employee Board member's election under this
                  Director Fee Option Grant Program, and


                                       24
<PAGE>   26
                           B is the Fair Market Value per share of Common Stock
                  on the option grant date.

                  C. EXERCISE AND TERM OF OPTIONS. The option shall become
exercisable in a series of twelve (12) equal monthly installments upon the
Optionee's completion of each calendar month of Board service during the
calendar year for which the retainer fee election is in effect. Each option
shall have a maximum term of ten (10) years measured from the option grant date.

                  D. LIMITED TRANSFERABILITY OF OPTIONS. Each option under this
Article Six may be assigned in whole or in part during the Optionee's lifetime
to one or more members of the Optionee's family or to a trust established
exclusively for one or more such family members or to Optionee's former spouse,
to the extent such assignment is in connection with Optionee's estate plan or
pursuant to a domestic relations order. The assigned portion may only be
exercised by the person or persons who acquire a proprietary interest in the
option pursuant to the assignment. The terms applicable to the assigned portion
shall be the same as those in effect for the option immediately prior to such
assignment and shall be set forth in such documents issued to the assignee as
the Plan Administrator may deem appropriate. The Optionee may also designate one
or more persons as the beneficiary or beneficiaries of his or her outstanding
options under this Article Six, and those options shall, in accordance with such
designation, automatically be transferred to such beneficiary or beneficiaries
upon the Optionee's death while holding those options. Such beneficiary or
beneficiaries shall take the transferred options subject to all the terms and
conditions of the applicable agreement evidencing each such transferred option,
including (without limitation) the limited time period during which the option
may be exercised following the Optionee's death.

                  E. TERMINATION OF BOARD SERVICE. Should the Optionee cease
Board service for any reason (other than death or Permanent Disability) while
holding one or more options under this Director Fee Option Grant Program, then
each such option shall remain exercisable, for any or all of the shares for
which the option is exercisable at the time of such cessation of Board service,
until the earlier of (i) the expiration of the ten (10)-year option term or (ii)
the expiration of the three (3)-year period measured from the date of such
cessation of Board service. However, each option held by the Optionee under this
Director Fee Option Grant Program at the time of his or her cessation of Board
service shall immediately terminate and cease to remain outstanding with respect
to any and all shares of Common Stock for which the option is not otherwise at
that time exercisable.

                  F. DEATH OR PERMANENT DISABILITY. Should the Optionee's
service as a Board member cease by reason of death or Permanent Disability, then
each option held by such Optionee under this Director Fee Option Grant Program
shall immediately become exercisable for all the shares of Common Stock at the
time subject to that option, and the option may be exercised for any or all of
those shares as fully vested shares until the earlier of (i) the expiration of
the ten (10)-year option term or (ii) the expiration of the three (3)-year
period measured from


                                       25
<PAGE>   27
the date of such cessation of Board service. To the extent such option is held
by the Optionee at the time of his or her death, that option may be exercised by
the personal representative of the Optionee's estate or by the person or persons
to whom the option is transferred pursuant to the Optionee's will or the laws of
inheritance or by the designated beneficiary or beneficiaries of such option.

                  Should the Optionee die after cessation of Board service but
while holding one or more options under this Director Fee Option Grant Program,
then each such option may be exercised, for any or all of the shares for which
the option is exercisable at the time of the Optionee's cessation of Board
service (less any shares subsequently purchased by Optionee prior to death), by
the personal representative of the Optionee's estate or by the person or persons
to whom the option is transferred pursuant to the Optionee's will or the laws of
inheritance or by the designated beneficiary or beneficiaries of such option.
Such right of exercise shall lapse, and the option shall terminate, upon the
earlier of (i) the expiration of the ten (10)-year option term or (ii) the three
(3)-year period measured from the date of the Optionee's cessation of Board
service.

         III.     CORPORATE TRANSACTION/CHANGE IN CONTROL/HOSTILE TAKE-OVER

                  A. In the event of any Corporate Transaction while the
Optionee remains a Board member, each outstanding option held by such Optionee
under this Director Fee Option Grant Program shall automatically accelerate so
that each such option shall, immediately prior to the effective date of the
Corporate Transaction, become exercisable for all the shares of Common Stock at
the time subject to such option and may be exercised for any or all of those
shares as fully vested shares of Common Stock. Each such outstanding option
shall terminate immediately following the Corporate Transaction, except to the
extent assumed by the successor corporation (or parent thereof) in such
Corporate Transaction. Any option so assumed and shall remain exercisable for
the fully vested shares until the earlier of (i) the expiration of the ten
(10)-year option term or (ii) the expiration of the three (3)-year period
measured from the date of the Optionee's cessation of Board service.

                  B. In the event of a Change in Control while the Optionee
remains a Board member, each outstanding option held by such Optionee under this
Director Fee Option Grant Program shall automatically accelerate so that each
such option shall, immediately prior to the effective date of the Change in
Control, become exercisable for all the shares of Common Stock at the time
subject to such option and may be exercised for any or all of those shares as
fully vested shares of Common Stock. The option shall remain so exercisable
until the earliest to occur of (i) the expiration of the ten (10)-year option
term, (ii) the expiration of the three (3)-year period measured from the date of
the Optionee's cessation of Board service, (iii) the termination of the option
in connection with a Corporate Transaction or (iv) the surrender of the option
in connection with a Hostile Take-Over.


                                       26
<PAGE>   28
                  C. Upon the occurrence of a Hostile Take-Over, the Optionee
shall have a thirty (30)-day period in which to surrender to the Corporation
each outstanding option granted him or her under the Director Fee Option Grant
Program. The Optionee shall in return be entitled to a cash distribution from
the Corporation in an amount equal to the excess of (i) the Take-Over Price of
the shares of Common Stock at the time subject to each surrendered option
(whether or not the option is otherwise at the time exercisable for those
shares) over (ii) the aggregate exercise price payable for such shares. Such
cash distribution shall be paid within five (5) days following the surrender of
the option to the Corporation. No approval or consent of the Board or any Plan
Administrator shall be required at the time of the actual option surrender and
cash distribution.

                  D. Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction had
the option been exercised immediately prior to such Corporate Transaction.
Appropriate adjustments shall also be made to the exercise price payable per
share under each outstanding option, provided the aggregate exercise price
payable for such securities shall remain the same. To the extent the actual
holders of the Corporation's outstanding Common Stock receive cash consideration
for their Common Stock in consummation of the Corporate Transaction, the
successor corporation may, in connection with the assumption of the outstanding
options under the Director Fee Option Grant Program, substitute one or more
shares of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

                  E. The grant of options under the Director Fee Option Grant
Program shall in no way affect the right of the Corporation to adjust,
reclassify, reorganize or otherwise change its capital or business structure or
to merge, consolidate, dissolve, liquidate or sell or transfer all or any part
of its business or assets.

         IV.      REMAINING TERMS

                  The remaining terms of each option granted under this Director
Fee Option Grant Program shall be the same as the terms in effect for option
grants made under the Discretionary Option Grant Program.


                                       27
<PAGE>   29
                                  ARTICLE SEVEN

                                  MISCELLANEOUS

         I.       FINANCING

                  The Plan Administrator may permit any Optionee or Participant
to pay the option exercise price under the Discretionary Option Grant Program or
the purchase price of shares issued under the Stock Issuance Program by
delivering a full-recourse, interest-bearing promissory note payable in one or
more installments. The terms of any such promissory note (including the interest
rate and the terms of repayment) shall be established by the Plan Administrator
in its sole discretion. In no event may the maximum credit available to the
Optionee or Participant exceed the sum of (i) the aggregate option exercise
price or purchase price payable for the purchased shares (less the par value of
such shares) plus (ii) any Federal, state and local income and employment tax
liability incurred by the Optionee or the Participant in connection with the
option exercise or share purchase.

         II.      TAX WITHHOLDING

                  A. The Corporation's obligation to deliver shares of Common
Stock upon the exercise of options or the issuance or vesting of such shares
under the Plan shall be subject to the satisfaction of all applicable Federal,
state and local income and employment tax withholding requirements.

                  B. The Plan Administrator may, in its discretion, provide any
or all holders of Non-Statutory Options or unvested shares of Common Stock under
the Plan (other than the options granted or the shares issued under the
Automatic Option Grant or Director Fee Option Grant Program) with the right to
use shares of Common Stock in satisfaction of all or part of the Withholding
Taxes to which such holders may become subject in connection with the exercise
of their options or the vesting of their shares. Such right may be provided to
any such holder in either or both of the following formats:

                           Stock Withholding: The election to have the
Corporation withhold, from the shares of Common Stock otherwise issuable upon
the exercise of such Non-Statutory Option or the vesting of such shares, a
portion of those shares with an aggregate Fair Market Value equal to the
percentage of the Withholding Taxes (not to exceed one hundred percent (100%))
designated by the holder.

                           Stock Delivery: The election to deliver to the
Corporation, at the time the Non-Statutory Option is exercised or the shares
vest, one or more shares of Common Stock previously acquired by such holder
(other than in connection with the option exercise or share vesting triggering
the Withholding Taxes) with an aggregate Fair Market Value equal to the
percentage of the Withholding Taxes (not to exceed one hundred percent (100%))
designated by the holder.


                                       28
<PAGE>   30
         III.     EFFECTIVE DATE AND TERM OF THE PLAN

                  A. The Plan shall become effective immediately on the Plan
Effective Date. However, the Salary Investment Option Grant Program and the
Director Fee Option Grant Program shall not be implemented until such time as
the Primary Committee may deem appropriate. Options may be granted under the
Discretionary Option Grant at any time on or after the Plan Effective Date, and
the initial option grants under the Automatic Option Grant Program shall also be
made on the Plan Effective Date to any non-employee Board members eligible for
such grants at that time. However, no options granted under the Plan may be
exercised, and no shares shall be issued under the Plan, until the Plan is
approved by the Corporation's stockholders. If such stockholder approval is not
obtained within twelve (12) months after the Plan Effective Date, then all
options previously granted under this Plan shall terminate and cease to be
outstanding, and no further options shall be granted and no shares shall be
issued under the Plan.

                  B. The Plan shall serve as the successor to the Predecessor
Plan, and no further option grants or direct stock issuances shall be made under
the Predecessor Plan after the Plan Effective Date. All options outstanding
under the Predecessor Plan on the Plan Effective Date shall be incorporated into
the Plan at that time and shall be treated as outstanding options under the
Plan. However, each outstanding option so incorporated shall continue to be
governed solely by the terms of the documents evidencing such option, and no
provision of the Plan shall be deemed to affect or otherwise modify the rights
or obligations of the holders of such incorporated options with respect to their
acquisition of shares of Common Stock.

                  C. One or more provisions of the Plan, including (without
limitation) the option/vesting acceleration provisions of Article Two relating
to Corporate Transactions and Changes in Control, may, in the Plan
Administrator's discretion, be extended to one or more options incorporated from
the Predecessor Plan which do not otherwise contain such provisions.

                  D. The Plan shall terminate upon the earliest to occur of (i)
February 7, 2010, (ii) the date on which all shares available for issuance under
the Plan shall have been issued as fully vested shares or (iii) the termination
of all outstanding options in connection with a Corporate Transaction. Should
the Plan terminate on February 7, 2010, then all option grants and unvested
stock issuances outstanding at that time shall continue to have force and effect
in accordance with the provisions of the documents evidencing such grants or
issuances.

         IV.      AMENDMENT OF THE PLAN

                  A. The Board shall have complete and exclusive power and
authority to amend or modify the Plan in any or all respects. However, no such
amendment or modification shall adversely affect the rights and obligations with
respect to stock options or unvested stock issuances at the time outstanding
under the Plan unless the Optionee or the Participant consents to such amendment
or modification. In addition, certain amendments may require stockholder
approval pursuant to applicable laws or regulations.


                                       29
<PAGE>   31
                  B. Options to purchase shares of Common Stock may be granted
under the Discretionary Option Grant and Salary Investment Option Grant Programs
and shares of Common Stock may be issued under the Stock Issuance Program that
are in each instance in excess of the number of shares then available for
issuance under the Plan, provided any excess shares actually issued under those
programs shall be held in escrow until there is obtained stockholder approval of
an amendment sufficiently increasing the number of shares of Common Stock
available for issuance under the Plan. If such stockholder approval is not
obtained within twelve (12) months after the date the first such excess
issuances are made, then (i) any unexercised options granted on the basis of
such excess shares shall terminate and cease to be outstanding and (ii) the
Corporation shall promptly refund to the Optionees and the Participants the
exercise or purchase price paid for any excess shares issued under the Plan and
held in escrow, together with interest (at the applicable Short Term Federal
Rate) for the period the shares were held in escrow, and such shares shall
thereupon be automatically cancelled and cease to be outstanding.

         V.       USE OF PROCEEDS

                  Any cash proceeds received by the Corporation from the sale of
shares of Common Stock under the Plan shall be used for general corporate
purposes.

         VI.      REGULATORY APPROVALS

                  A. The implementation of the Plan, the granting of any stock
option under the Plan and the issuance of any shares of Common Stock (i) upon
the exercise of any granted option or (ii) under the Stock Issuance Program
shall be subject to the Corporation's procurement of all approvals and permits
required by regulatory authorities having jurisdiction over the Plan, the stock
options granted under it and the shares of Common Stock issued pursuant to it.

                  B. No shares of Common Stock or other assets shall be issued
or delivered under the Plan unless and until there shall have been compliance
with all applicable requirements of Federal and state securities laws, including
the filing and effectiveness of the Form S-8 registration statement for the
shares of Common Stock issuable under the Plan, and all applicable listing
requirements of any stock exchange (or the Nasdaq National Market, if
applicable) on which Common Stock is then listed for trading.

         VII.     NO EMPLOYMENT/SERVICE RIGHTS

                  Nothing in the Plan shall confer upon the Optionee or the
Participant any right to continue in Service for any period of specific duration
or interfere with or otherwise restrict in any way the rights of the Corporation
(or any Parent or Subsidiary employing or retaining such person) or of the
Optionee or the Participant, which rights are hereby expressly reserved by each,
to terminate such person's Service at any time for any reason, with or without
cause.


                                       30
<PAGE>   32
                                    APPENDIX

                  The following definitions shall be in effect under the Plan:

                  A. AUTOMATIC OPTION GRANT PROGRAM shall mean the automatic
option grant program in effect under Article Five of the Plan.

                  B. BOARD shall mean the Corporation's Board of Directors.

                  C. CHANGE IN CONTROL shall mean a change in ownership or
control of the Corporation effected through either of the following
transactions:

                                    (i) the acquisition, directly or indirectly
         by any person or related group of persons (other than the Corporation
         or a person that directly or indirectly controls, is controlled by, or
         is under common control with, the Corporation), of beneficial ownership
         (within the meaning of Rule 13d-3 of the 1934 Act) of securities
         possessing more than fifty percent (50%) of the total combined voting
         power of the Corporation's outstanding securities pursuant to a tender
         or exchange offer made directly to the Corporation's stockholders, or

                                    (ii) a change in the composition of the
         Board over a period of thirty-six (36) consecutive months or less such
         that a majority of the Board members ceases, by reason of one or more
         contested elections for Board membership, to be comprised of
         individuals who either (A) have been Board members continuously since
         the beginning of such period or (B) have been elected or nominated for
         election as Board members during such period by at least a majority of
         the Board members described in clause (A) who were still in office at
         the time the Board approved such election or nomination.

                  D. CODE shall mean the Internal Revenue Code of 1986, as
amended.

                  E. COMMON STOCK shall mean the Corporation's common stock.

                  F. CORPORATE TRANSACTION shall mean either of the following
stockholder-approved transactions to which the Corporation is a party:

                                    (i) a merger or consolidation in which
         securities possessing more than fifty percent (50%) of the total
         combined voting power of the Corporation's outstanding securities are
         transferred to a person or persons different from the persons holding
         those securities immediately prior to such transaction, or

                                    (ii) the sale, transfer or other disposition
         of all or substantially all of the Corporation's assets in complete
         liquidation or dissolution of the Corporation.


                                      A-1.
<PAGE>   33
                  G. CORPORATION shall mean Sangamo BioSciences, Inc., a
Delaware corporation, and any corporate successor to all or substantially all of
the assets or voting stock of Sangamo BioSciences, Inc. which shall by
appropriate action adopt the Plan.

                  H. DIRECTOR FEE OPTION GRANT PROGRAM shall mean the special
stock option grant in effect for non-employee Board members under Article Six of
the Plan.

                  I. DISCRETIONARY OPTION GRANT PROGRAM shall mean the
discretionary option grant program in effect under Article Two of the Plan.

                  J. EMPLOYEE shall mean an individual who is in the employ of
the Corporation (or any Parent or Subsidiary), subject to the control and
direction of the employer entity as to both the work to be performed and the
manner and method of performance.

                  K. EXERCISE DATE shall mean the date on which the Corporation
shall have received written notice of the option exercise.

                  L. FAIR MARKET VALUE per share of Common Stock on any relevant
date shall be determined in accordance with the following provisions:

                                    (i) If the Common Stock is at the time
         traded on the Nasdaq National Market, then the Fair Market Value shall
         be the closing selling price per share of Common Stock on the date in
         question, as such price is reported by the National Association of
         Securities Dealers on the Nasdaq National Market and published in The
         Wall Street Journal. If there is no closing selling price for the
         Common Stock on the date in question, then the Fair Market Value shall
         be the closing selling price on the last preceding date for which such
         quotation exists.

                                    (ii) If the Common Stock is at the time
         listed on any Stock Exchange, then the Fair Market Value shall be the
         closing selling price per share of Common Stock on the date in question
         on the Stock Exchange determined by the Plan Administrator to be the
         primary market for the Common Stock, as such price is officially quoted
         in the composite tape of transactions on such exchange and published in
         The Wall Street Journal. If there is no closing selling price for the
         Common Stock on the date in question, then the Fair Market Value shall
         be the closing selling price on the last preceding date for which such
         quotation exists.

                                    (iii) For purposes of any option grants made
         on the Underwriting Date, the Fair Market Value shall be deemed to be
         equal to the price per share at which the Common Stock is to be sold in
         the initial public offering pursuant to the Underwriting Agreement.


                                      A-2.
<PAGE>   34
                  M. HOSTILE TAKE-OVER shall mean the acquisition, directly or
indirectly, by any person or related group of persons (other than the
Corporation or a person that directly or indirectly controls, is controlled by,
or is under common control with, the Corporation) of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more
than fifty percent (50%) of the total combined voting power of the Corporation's
outstanding securities pursuant to a tender or exchange offer made directly to
the Corporation's stockholders which the Board does not recommend such
stockholders to accept.

                  N. INCENTIVE OPTION shall mean an option which satisfies the
requirements of Code Section 422.

                  O. INVOLUNTARY TERMINATION shall mean the termination of the
Service of any individual which occurs by reason of:

                                    (i) such individual's involuntary dismissal
         or discharge by the Corporation for reasons other than Misconduct, or

                                    (ii) such individual's voluntary resignation
         following (A) a change in his or her position with the Corporation
         which materially reduces his or her duties and responsibilities or the
         level of management to which he or she reports, (B) a reduction in his
         or her level of compensation (including base salary, fringe benefits
         and target bonus under any corporate-performance based bonus or
         incentive programs) by more than fifteen percent (15%) or (C) a
         relocation of such individual's place of employment by more than fifty
         (50) miles, provided and only if such change, reduction or relocation
         is effected by the Corporation without the individual's consent.

                  P. MISCONDUCT shall mean the commission of any act of fraud,
embezzlement or dishonesty by the Optionee or Participant, any unauthorized use
or disclosure by such person of confidential information or trade secrets of the
Corporation (or any Parent or Subsidiary), or any other intentional misconduct
by such person adversely affecting the business or affairs of the Corporation
(or any Parent or Subsidiary) in a material manner. The foregoing definition
shall not be deemed to be inclusive of all the acts or omissions which the
Corporation (or any Parent or Subsidiary) may consider as grounds for the
dismissal or discharge of any Optionee, Participant or other person in the
Service of the Corporation (or any Parent or Subsidiary).

                  Q. 1934 ACT shall mean the Securities Exchange Act of 1934, as
amended.

                  R. NON-STATUTORY OPTION shall mean an option not intended to
satisfy the requirements of Code Section 422.

                  S. OPTIONEE shall mean any person to whom an option is granted
under the Discretionary Option Grant, Salary Investment Option Grant, Automatic
Option Grant or Director Fee Option Grant Program.


                                      A-3.
<PAGE>   35
                  T. PARENT shall mean any corporation (other than the
Corporation) in an unbroken chain of corporations ending with the Corporation,
provided each corporation in the unbroken chain (other than the Corporation)
owns, at the time of the determination, stock possessing fifty percent (50%) or
more of the total combined voting power of all classes of stock in one of the
other corporations in such chain.

                  U. PARTICIPANT shall mean any person who is issued shares of
Common Stock under the Stock Issuance Program.

                  V. PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the
inability of the Optionee or the Participant to engage in any substantial
gainful activity by reason of any medically determinable physical or mental
impairment expected to result in death or to be of continuous duration of twelve
(12) months or more. However, solely for purposes of the Automatic Option Grant
and Director Fee Option Grant Programs, Permanent Disability or Permanently
Disabled shall mean the inability of the non-employee Board member to perform
his or her usual duties as a Board member by reason of any medically
determinable physical or mental impairment expected to result in death or to be
of continuous duration of twelve (12) months or more.

                  W. PLAN shall mean the Corporation's 2000 Stock Incentive
Plan, as set forth in this document.

                  X. PLAN ADMINISTRATOR shall mean the particular entity,
whether the Primary Committee, the Board or the Secondary Committee, which is
authorized to administer the Discretionary Option Grant and Stock Issuance
Programs with respect to one or more classes of eligible persons, to the extent
such entity is carrying out its administrative functions under those programs
with respect to the persons under its jurisdiction.

                  Y. PLAN EFFECTIVE DATE shall mean the date the Plan shall
become effective and shall be coincident with the Underwriting Date.

                  Z. PREDECESSOR PLAN shall mean the Corporation's 1995 Stock
Option Plan in effect immediately prior to the Plan Effective Date hereunder.

                  AA. PRIMARY COMMITTEE shall mean the committee of two (2) or
more non-employee Board members appointed by the Board to administer the
Discretionary Option Grant and Stock Issuance Programs with respect to Section
16 Insiders and to administer the Salary Investment Option Grant Program solely
with respect to the selection of the eligible individuals who may participate in
such program.

                  BB. SALARY INVESTMENT OPTION GRANT PROGRAM shall mean the
salary investment option grant program in effect under Article Three of the
Plan.

                  CC. SECONDARY COMMITTEE shall mean a committee of one or more
Board members appointed by the Board to administer the Discretionary Option
Grant and Stock Issuance Programs with respect to eligible persons other than
Section 16 Insiders.


                                      A-4.
<PAGE>   36
                  DD. SECTION 16 INSIDER shall mean an officer or director of
the Corporation subject to the short-swing profit liabilities of Section 16 of
the 1934 Act.

                  EE. SERVICE shall mean the performance of services for the
Corporation (or any Parent or Subsidiary) by a person in the capacity of an
Employee, a non-employee member of the board of directors or a consultant or
independent advisor, except to the extent otherwise specifically provided in the
documents evidencing the option grant or stock issuance.

                  FF. STOCK EXCHANGE shall mean either the American Stock
Exchange or the New York Stock Exchange.

                  GG. STOCK ISSUANCE AGREEMENT shall mean the agreement entered
into by the Corporation and the Participant at the time of issuance of shares of
Common Stock under the Stock Issuance Program.

                  HH. STOCK ISSUANCE PROGRAM shall mean the stock issuance
program in effect under Article Four of the Plan.

                  II. SUBSIDIARY shall mean any corporation (other than the
Corporation) in an unbroken chain of corporations beginning with the
Corporation, provided each corporation (other than the last corporation) in the
unbroken chain owns, at the time of the determination, stock possessing fifty
percent (50%) or more of the total combined voting power of all classes of stock
in one of the other corporations in such chain.

                  JJ. TAKE-OVER PRICE shall mean the greater of (i) the Fair
Market Value per share of Common Stock on the date the option is surrendered to
the Corporation in connection with a Hostile Take-Over or (ii) the highest
reported price per share of Common Stock paid by the tender offeror in effecting
such Hostile Take-Over. However, if the surrendered option is an Incentive
Option, the Take-Over Price shall not exceed the clause (i) price per share.

                  KK. 10% STOCKHOLDER shall mean the owner of stock (as
determined under Code Section 424(d)) possessing more than ten percent (10%) of
the total combined voting power of all classes of stock of the Corporation (or
any Parent or Subsidiary).

                  LL. UNDERWRITING AGREEMENT shall mean the agreement between
the Corporation and the underwriter or underwriters managing the initial public
offering of the Common Stock.

                  MM. UNDERWRITING DATE shall mean the date on which the
Underwriting Agreement is executed and priced in connection with an initial
public offering of the Common Stock.

                  NN. WITHHOLDING TAXES shall mean the Federal, state and local
income and employment withholding taxes to which the holder of Non-Statutory
Options or unvested shares of Common Stock may become subject in connection with
the exercise of those options or the vesting of those shares.


                                      A-5.

<PAGE>   1
                                  EXHIBIT 99.2

                            SANGAMO BIOSCIENCES, INC.
                        2000 EMPLOYEE STOCK PURCHASE PLAN

<PAGE>   2
                            SANGAMO BIOSCIENCES, INC.

                        2000 EMPLOYEE STOCK PURCHASE PLAN


         I.       PURPOSE OF THE PLAN

                  This Employee Stock Purchase Plan is intended to promote the
interests of Sangamo BioSciences, Inc., a Delaware corporation, by providing
eligible employees with the opportunity to acquire a proprietary interest in the
Corporation through participation in a payroll deduction-based employee stock
purchase plan designed to qualify under Section 423 of the Code.

                  Capitalized terms herein shall have the meanings assigned to
such terms in the attached Appendix.

         II.      ADMINISTRATION OF THE PLAN

                  The Plan Administrator shall have full authority to interpret
and construe any provision of the Plan and to adopt such rules and regulations
for administering the Plan as it may deem necessary in order to comply with the
requirements of Code Section 423. Decisions of the Plan Administrator shall be
final and binding on all parties having an interest in the Plan.

         III.     STOCK SUBJECT TO PLAN

                  A. The stock purchasable under the Plan shall be shares of
authorized but unissued or reacquired Common Stock, including shares of Common
Stock purchased on the open market. The number of shares of Common Stock
initially reserved for issuance over the term of the Plan shall be limited to
400,000 shares.

                  B. The number of shares of Common Stock available for issuance
under the Plan shall automatically increase on the first trading day of each
fiscal year of the Corporation during the term of the Plan, beginning with
fiscal year 2001, by an amount equal to one percent (1%) of the total number of
shares of Common Stock outstanding on the last trading day in the immediately
preceding fiscal year, but in no event shall any such annual increase exceed
600,000 shares.

                  C. Should any change be made to the Common Stock by reason of
any stock split, stock dividend, recapitalization, combination of shares,
exchange of shares or other change affecting the outstanding Common Stock as a
class without the Corporation's receipt of consideration, appropriate
adjustments shall be made to (i) the maximum number and class of securities
issuable under the Plan, (ii) the maximum number and class of securities
purchasable per Participant on any one Purchase Date, (iii) the maximum number
and class of securities purchasable in total by all Participants on any one
Purchase Date, (iv) the maximum number

<PAGE>   3
and/or class of securities by which the share reserve is to increase
automatically each fiscal year pursuant to the provisions of Section III.B of
this Article One and (v) the number and class of securities and the price per
share in effect under each outstanding purchase right in order to prevent the
dilution or enlargement of benefits thereunder.

         IV.      OFFERING PERIODS

                  A. Shares of Common Stock shall be offered for purchase under
the Plan through a series of overlapping offering periods until such time as (i)
the maximum number of shares of Common Stock available for issuance under the
Plan shall have been purchased or (ii) the Plan shall have been sooner
terminated.

                  B. Each offering period shall be of such duration (not to
exceed twenty-four (24) months) as determined by the Plan Administrator prior to
the start date of such offering period. Offering periods shall commence at
semi-annual intervals on the first business day of May and November each year
over the term of the Plan. Accordingly, two (2) separate offering periods shall
commence in each calendar year the Plan remains in existence. However, the
initial offering period shall commence at the Effective Time and terminate on
the last business day in April 2002.

                  C. Each offering period shall consist of a series of one or
more successive Purchase Intervals. Purchase Intervals shall run from the first
business day in May to the last business day in October each year and from the
first business day in November each year to the last business day in April in
the following year. However, the first Purchase Interval in effect under the
initial offering period shall commence at the Effective Time and terminate on
the last business day in October 2000.

                  D. Should the Fair Market Value per share of Common Stock on
any Purchase Date within a particular offering period be less than the Fair
Market Value per share of Common Stock on the start date of that offering
period, then that offering period shall automatically terminate immediately
after the purchase of shares of Common Stock on such Purchase Date, and a new
offering period shall commence on the next business day following such Purchase
Date. The new offering period shall have a duration of twenty (24) months,
unless a shorter duration is established by the Plan Administrator within five
(5) business days following the start date of that offering period. All
individuals participating in the terminated offering period shall automatically
be transferred to the new offering period.

         V.       ELIGIBILITY

                  A. Each individual who is an Eligible Employee on the start
date of any offering period under the Plan may enter that offering period on
such start date. However, an Eligible Employees may participate in only one
offering period at a time.


                                       2.
<PAGE>   4
                  B. To participate in the Plan for a particular offering
period, the Eligible Employee must complete the enrollment forms prescribed by
the Plan Administrator (including a stock purchase agreement and a payroll
deduction authorization) and file such forms with the Plan Administrator (or its
designate) on or before the start date of that offering period.

         VI.      PAYROLL DEDUCTIONS

                  A. The payroll deduction authorized by the Participant for
purposes of acquiring shares of Common Stock during an offering period may be
any multiple of one percent (1%) of the Cash Earnings paid to the Participant
during each Purchase Interval within that offering period, up to a maximum of
fifteen percent (15%). The deduction rate so authorized shall continue in effect
throughout the offering period, except to the extent such rate is changed in
accordance with the following guidelines:

                           (i) The Participant may, at any time during the
         offering period, reduce his or her rate of payroll deduction to become
         effective as soon as possible after filing the appropriate form with
         the Plan Administrator. The Participant may not, however, effect more
         than one (1) such reduction per Purchase Interval.

                           (ii) The Participant may, prior to the commencement
         of any new Purchase Interval within the offering period, increase the
         rate of his or her payroll deduction by filing the appropriate form
         with the Plan Administrator. The new rate (which may not exceed the
         fifteen percent (15%) maximum) shall become effective on the start date
         of the first Purchase Interval following the filing of such form.

                  B. Payroll deductions shall begin on the first pay day
administratively feasible following the start of the offering period in which
the Participant is enrolled and shall (unless sooner terminated by the
Participant) continue through the pay day ending with or immediately prior to
the last day of that offering period. The amounts so collected shall be credited
to the Participant's book account under the Plan, but no interest shall be paid
on the balance from time to time outstanding in such account. The amounts
collected from the Participant shall not be required to be held in any
segregated account or trust fund and may be commingled with the general assets
of the Corporation and used for general corporate purposes.

                  C. Payroll deductions shall automatically cease upon the
termination of the Participant's purchase right in accordance with the
provisions of the Plan.

                  D. The Participant's acquisition of Common Stock under the
Plan on any Purchase Date shall neither limit nor require the Participant's
acquisition of Common Stock on any subsequent Purchase Date, whether within the
same or a different offering period.


                                       3.
<PAGE>   5
         VII.     PURCHASE RIGHTS

                  A. GRANT OF PURCHASE RIGHTS. A Participant shall be granted a
separate purchase right for each offering period in which he or she is enrolled.
The purchase right shall be granted on the start date of the offering period and
shall provide the Participant with the right to purchase shares of Common Stock,
in a series of successive installments during that offering period, upon the
terms set forth below. The Participant shall execute a stock purchase agreement
embodying such terms and such other provisions (not inconsistent with the Plan)
as the Plan Administrator may deem advisable.

                  Under no circumstances shall purchase rights be granted under
the Plan to any Eligible Employee if such individual would, immediately after
the grant, own (within the meaning of Code Section 424(d)) or hold outstanding
options or other rights to purchase, stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Corporation or any Corporate Affiliate.

                  B. EXERCISE OF THE PURCHASE RIGHT. Each purchase right shall
be automatically exercised in installments on each successive Purchase Date
within the offering period, and shares of Common Stock shall accordingly be
purchased on behalf of each Participant on each such Purchase Date. The purchase
shall be effected by applying the Participant's payroll deductions for the
Purchase Interval ending on such Purchase Date to the purchase of whole shares
of Common Stock at the purchase price in effect for the Participant for that
Purchase Date.

                  C. PURCHASE PRICE. The purchase price per share at which
Common Stock will be purchased on the Participant's behalf on each Purchase Date
within the particular offering period in which he or she is enrolled shall be
equal to eighty-five percent (85%) of the lower of (i) the Fair Market Value per
share of Common Stock on the start date of that offering period or (ii) the Fair
Market Value per share of Common Stock on that Purchase Date.

                  D. NUMBER OF PURCHASABLE SHARES. The number of shares of
Common Stock purchasable by a Participant on each Purchase Date during the
particular offering period in which he or she is enrolled shall be the number of
whole shares obtained by dividing the amount collected from the Participant
through payroll deductions during the Purchase Interval ending with that
Purchase Date by the purchase price in effect for the Participant for that
Purchase Date. However, the maximum number of shares of Common Stock purchasable
per Participant on any one Purchase Date shall not exceed 2,000 shares, subject
to periodic adjustments in the event of certain changes in the Corporation's
capitalization. In addition, the maximum number of shares of Common Stock
purchasable in total by all Participants in the Plan on any one Purchase Date
shall not exceed 200,000 shares, subject to periodic adjustments in the event of
certain changes in the Corporation's capitalization. However, the Plan
Administrator shall have the discretionary authority, exercisable prior to the
start of any offering period under the Plan, to increase or decrease the
limitations to be in effect for the number of shares purchasable per Participant
and in total by all Participants enrolled in that particular offering period on
each Purchase Date which occurs during that offering period.


                                       4.
<PAGE>   6
                  E. EXCESS PAYROLL DEDUCTIONS. Any payroll deductions not
applied to the purchase of shares of Common Stock on any Purchase Date because
they are not sufficient to purchase a whole share of Common Stock shall be held
for the purchase of Common Stock on the next Purchase Date. However, any payroll
deductions not applied to the purchase of Common Stock by reason of the
limitation on the maximum number of shares purchasable per Participant or in
total by all Participants on the Purchase Date shall be promptly refunded.

                  F. TERMINATION OF PURCHASE RIGHT. The following provisions
shall govern the termination of outstanding purchase rights:

                           (i) A Participant may, at any time prior to the next
         scheduled Purchase Date in the offering period in which he or she is
         enrolled, terminate his or her outstanding purchase right by filing the
         appropriate form with the Plan Administrator (or its designate), and no
         further payroll deductions shall be collected from the Participant with
         respect to the terminated purchase right. Any payroll deductions
         collected during the Purchase Interval in which such termination occurs
         shall, at the Participant's election, be immediately refunded or held
         for the purchase of shares on the next Purchase Date. If no such
         election is made at the time such purchase right is terminated, then
         the payroll deductions collected with respect to the terminated right
         shall be refunded as soon as possible.

                           (ii) The termination of such purchase right shall be
         irrevocable, and the Participant may not subsequently rejoin the
         offering period for which the terminated purchase right was granted. In
         order to resume participation in any subsequent offering period, such
         individual must re-enroll in the Plan (by making a timely filing of the
         prescribed enrollment forms) on or before the start date of that
         offering period.

                           (iii) Should the Participant cease to remain an
         Eligible Employee for any reason (including death, disability or change
         in status) while his or her purchase right remains outstanding, then
         that purchase right shall immediately terminate, and all of the
         Participant's payroll deductions for the Purchase Interval in which the
         purchase right so terminates shall be immediately refunded. However,
         should the Participant cease to remain in active service by reason of
         an approved unpaid leave of absence, then the Participant shall have
         the right, exercisable up until the last business day of the Purchase
         Interval in which such leave commences, to (a) withdraw all the payroll
         deductions collected to date on his or her behalf for that Purchase
         Interval or (b) have such funds held for the purchase of shares on his
         or her behalf on the next scheduled Purchase Date. In no event,
         however, shall any further payroll deductions be collected on the
         Participant's behalf during such leave. Upon the Participant's return
         to active service (x) within ninety (90) days following the
         commencement of such leave or (y) prior to the expiration of any longer
         period for which such Participant's right


                                       5.
<PAGE>   7
         to reemployment with the Corporation is guaranteed by statute or
         contract, his or her payroll deductions under the Plan shall
         automatically resume at the rate in effect at the time the leave began,
         unless the Participant withdraws from the Plan prior to his or her
         return. An individual who returns to active employment following a
         leave of absence that exceeds in duration the applicable (x) or (y)
         time period will be treated as a new Employee for purposes of
         subsequent participation in the Plan and must accordingly re-enroll in
         the Plan (by making a timely filing of the prescribed enrollment forms)
         on or before the start date of any subsequent offering period in which
         he or she wishes to participate.

                  G. CHANGE IN CONTROL. Each outstanding purchase right shall
automatically be exercised, immediately prior to the effective date of any
Change in Control, by applying the payroll deductions of each Participant for
the Purchase Interval in which such Change in Control occurs to the purchase of
whole shares of Common Stock at a purchase price per share equal to eighty-five
percent (85%) of the lower of (i) the Fair Market Value per share of Common
Stock on the start date of the offering period in which such Participant is
enrolled at the time of such Change in Control or (ii) the Fair Market Value per
share of Common Stock immediately prior to the effective date of such Change in
Control. However, the applicable limitation on the number of shares of Common
Stock purchasable per Participant shall continue to apply to any such purchase,
but not the limitation applicable to the maximum number of shares of Common
Stock purchasable in total by all Participants in the Plan on any one Purchase
Date.

                  The Corporation shall use its best efforts to provide at least
ten (10) days' prior written notice of the occurrence of any Change in Control,
and Participants shall, following the receipt of such notice, have the right to
terminate their outstanding purchase rights prior to the effective date of the
Change in Control.

                  H. PRORATION OF PURCHASE RIGHTS. Should the total number of
shares of Common Stock to be purchased pursuant to outstanding purchase rights
on any particular date exceed the number of shares then available for issuance
under the Plan, the Plan Administrator shall make a pro-rata allocation of the
available shares on a uniform and nondiscriminatory basis, and the payroll
deductions of each Participant, to the extent in excess of the aggregate
purchase price payable for the Common Stock pro-rated to such individual, shall
be refunded.

                  I. ASSIGNABILITY. The purchase right shall be exercisable only
by the Participant and shall not be assignable or transferable by the
Participant.

                  J. STOCKHOLDER RIGHTS. A Participant shall have no stockholder
rights with respect to the shares subject to his or her outstanding purchase
right until the shares are purchased on the Participant's behalf in accordance
with the provisions of the Plan and the Participant has become a holder of
record of the purchased shares.


                                       6.
<PAGE>   8
         VIII.    ACCRUAL LIMITATIONS

                  A. No Participant shall be entitled to accrue rights to
acquire Common Stock pursuant to any purchase right outstanding under this Plan
if and to the extent such accrual, when aggregated with (i) rights to purchase
Common Stock accrued under any other purchase right granted under this Plan and
(ii) similar rights accrued under other employee stock purchase plans (within
the meaning of Code Section 423)) of the Corporation or any Corporate Affiliate,
would otherwise permit such Participant to purchase more than Twenty-Five
Thousand Dollars ($25,000.00) worth of stock of the Corporation or any Corporate
Affiliate (determined on the basis of the Fair Market Value per share on the
date or dates such rights are granted) for each calendar year such rights are at
any time outstanding.

                  B. For purposes of applying such accrual limitations to the
purchase rights granted under the Plan, the following provisions shall be in
effect:

                           (i) The right to acquire Common Stock under each
         outstanding purchase right shall accrue in a series of installments on
         each successive Purchase Date during the offering period on which such
         right remains outstanding.

                           (ii) No right to acquire Common Stock under any
         outstanding purchase right shall accrue to the extent the Participant
         has already accrued in the same calendar year the right to acquire
         Common Stock under one or more other purchase rights at a rate equal to
         Twenty-Five Thousand Dollars ($25,000.00) worth of Common Stock
         (determined on the basis of the Fair Market Value per share on the date
         or dates of grant) for each calendar year such rights were at any time
         outstanding.

                  C. If by reason of such accrual limitations, any purchase
right of a Participant does not accrue for a particular Purchase Interval, then
the payroll deductions that the Participant made during that Purchase Interval
with respect to such purchase right shall be promptly refunded.

                  D. In the event there is any conflict between the provisions
of this Article and one or more provisions of the Plan or any instrument issued
thereunder, the provisions of this Article shall be controlling.

         IX.      EFFECTIVE DATE AND TERM OF THE PLAN

                  A. The Plan was adopted by the Board on February 8, 2000, and
shall become effective at the Effective Time, provided no purchase rights
granted under the Plan shall be exercised, and no shares of Common Stock shall
be issued hereunder, until (i) the Plan shall have been approved by the
stockholders of the Corporation and (ii) the Corporation shall have complied
with all applicable requirements of the 1933 Act (including the registration of
the shares of Common Stock issuable under the Plan on a Form S-8 registration
statement filed with the Securities and Exchange Commission), all applicable
listing requirements of any stock


                                       7.
<PAGE>   9
exchange (or the Nasdaq National Market, if applicable) on which the Common
Stock is listed for trading and all other applicable requirements established by
law or regulation. In the event such stockholder approval is not obtained, or
such compliance is not effected, within twelve (12) months after the date on
which the Plan is adopted by the Board, the Plan shall terminate and have no
further force or effect, and all sums collected from Participants during the
initial offering period hereunder shall be refunded.

                  B. Unless sooner terminated by the Board, the Plan shall
terminate upon the earliest of (i) the last business day in April 2010, (ii) the
date on which all shares available for issuance under the Plan shall have been
sold pursuant to purchase rights exercised under the Plan or (iii) the date on
which all purchase rights are exercised in connection with a Change in Control.
No further purchase rights shall be granted or exercised, and no further payroll
deductions shall be collected, under the Plan following such termination.

         X.       AMENDMENT OF THE PLAN

                  A. The Board may alter, amend, suspend or terminate the Plan
at any time to become effective immediately following the close of any Purchase
Interval. However, the Plan may be amended or terminated immediately upon Board
action, if and to the extent necessary to assure that the Corporation will not
recognize, for financial reporting purposes, any compensation expense in
connection with the shares of Common Stock offered for purchase under the Plan,
should the financial accounting rules applicable to the Plan at the Effective
Time be subsequently revised so as to require the Corporation to recognize
compensation expense in the absence of such amendment or termination.

                  B. In no event may the Board effect any of the following
amendments or revisions to the Plan without the approval of the Corporation's
stockholders: (i) increase the number of shares of Common Stock issuable under
the Plan, except for permissible adjustments in the event of certain changes in
the Corporation's capitalization, (ii) alter the purchase price formula so as to
reduce the purchase price payable for the shares of Common Stock purchasable
under the Plan or (iii) modify the eligibility requirements for participation in
the Plan.

         XI.      GENERAL PROVISIONS

                  A. All costs and expenses incurred in the administration of
the Plan shall be paid by the Corporation; however, each Plan Participant shall
bear all costs and expenses incurred by such individual in the sale or other
disposition of any shares purchased under the Plan.

                  B. Nothing in the Plan shall confer upon the Participant any
right to continue in the employ of the Corporation or any Corporate Affiliate
for any period of specific duration or interfere with or otherwise restrict in
any way the rights of the Corporation (or any Corporate Affiliate employing such
person) or of the Participant, which rights are hereby expressly reserved by
each, to terminate such person's employment at any time for any reason, with or
without cause.


                                       8.
<PAGE>   10
                  C. The provisions of the Plan shall be governed by the laws of
the State of California without resort to that State's conflict-of-laws rules.


                                       9.
<PAGE>   11
                                   SCHEDULE A

                          CORPORATIONS PARTICIPATING IN
                          EMPLOYEE STOCK PURCHASE PLAN
                            AS OF THE EFFECTIVE TIME

                            Sangamo BioSciences, Inc.

<PAGE>   12
                                    APPENDIX


                  The following definitions shall be in effect under the Plan:

                  A. BOARD shall mean the Corporation's Board of Directors.

                  B. CASH EARNINGS shall mean (i) the regular base salary paid
to a Participant by one or more Participating Companies during such individual's
period of participation in one or more offering periods under the Plan plus (ii)
all overtime payments, bonuses, commissions, profit-sharing distributions and
other incentive-type payments received during such period. Such Cash Earnings
shall be calculated before deduction of (A) any income or employment tax
withholdings or (B) any contributions made by the Participant to any Code
Section 401(k) salary deferral plan or any Code Section 125 cafeteria benefit
program now or hereafter established by the Corporation or any Corporate
Affiliate. However, Cash Earnings shall NOT include any contributions made by
the Corporation or any Corporate Affiliate on the Participant's behalf to any
employee benefit or welfare plan now or hereafter established (other than Code
Section 401(k) or Code Section 125 contributions deducted from such Cash
Earnings).

                  C. CHANGE IN CONTROL shall mean a change in ownership of the
Corporation pursuant to any of the following transactions:

                           (i) a merger or consolidation in which securities
         possessing more than fifty percent (50%) of the total combined voting
         power of the Corporation's outstanding securities are transferred to a
         person or persons different from the persons holding those securities
         immediately prior to such transaction, or

                           (ii) the sale, transfer or other disposition of all
         or substantially all of the assets of the Corporation in complete
         liquidation or dissolution of the Corporation, or

                           (iii) the acquisition, directly or indirectly, by a
         person or related group of persons (other than the Corporation or a
         person that directly or indirectly controls, is controlled by or is
         under common control with the Corporation) of beneficial ownership
         (within the meaning of Rule 13d-3 of the 1934 Act) of securities
         possessing more than fifty percent (50%) of the total combined voting
         power of the Corporation's outstanding securities pursuant to a tender
         or exchange offer made directly to the Corporation's stockholders.

                  D. CODE shall mean the Internal Revenue Code of 1986, as
amended.

                  E. COMMON STOCK shall mean the Corporation's common stock.


                                      A-1.
<PAGE>   13
                  F. CORPORATE AFFILIATE shall mean any parent or subsidiary
corporation of the Corporation (as determined in accordance with Code Section
424), whether now existing or subsequently established.

                  G. CORPORATION shall mean Sangamo BioSciences, Inc., a
Delaware corporation, and any corporate successor to all or substantially all of
the assets or voting stock of Sangamo BioSciences, Inc. that shall by
appropriate action adopt the Plan.

                  H. EFFECTIVE TIME shall mean the time at which the
Underwriting Agreement is executed and the Common Stock priced for the initial
public offering of such Common Stock. Any Corporate Affiliate that becomes a
Participating Corporation after such Effective Time shall designate a subsequent
Effective Time with respect to its employee-Participants.

                  I. ELIGIBLE EMPLOYEE shall mean any person who is employed by
a Participating Corporation on a basis under which he or she is regularly
expected to render more than twenty (20) hours of service per week for more than
five (5) months per calendar year for earnings considered wages under Code
Section 3401 (a).

                  J. FAIR MARKET VALUE per share of Common Stock on any relevant
date shall be determined in accordance with the following provisions:

                           (i) If the Common Stock is at the time traded on the
         Nasdaq National Market, then the Fair Market Value shall be the closing
         selling price per share of Common Stock on the date in question, as
         such price is reported by the National Association of Securities
         Dealers on the Nasdaq National Market and published in The Wall Street
         Journal. If there is no closing selling price for the Common Stock on
         the date in question, then the Fair Market Value shall be the closing
         selling price on the last preceding date for which such quotation
         exists.

                           (ii) If the Common Stock is at the time listed on any
         Stock Exchange, then the Fair Market Value shall be the closing selling
         price per share of Common Stock on the date in question on the Stock
         Exchange determined by the Plan Administrator to be the primary market
         for the Common Stock, as such price is officially quoted in the
         composite tape of transactions on such exchange and published in The
         Wall Street Journal. If there is no closing selling price for the
         Common Stock on the date in question, then the Fair Market Value shall
         be the closing selling price on the last preceding date for which such
         quotation exists.

                           (iii) For purposes of the initial offering period
         that begins at the Effective Time, the Fair Market Value shall be
         deemed to be equal to the price per share at which the Common Stock is
         sold in the initial public offering pursuant to the Underwriting
         Agreement.

                  K. 1933 ACT shall mean the Securities Act of 1933, as amended.


                                      A-2.
<PAGE>   14
                  L. PARTICIPANT shall mean any Eligible Employee of a
Participating Corporation who is actively participating in the Plan.

                  M. PARTICIPATING CORPORATION shall mean the Corporation and
such Corporate Affiliate or Affiliates as may be authorized from time to time by
the Board to extend the benefits of the Plan to their Eligible Employees. The
Participating Corporations in the Plan are listed in attached Schedule A.

                  N. PLAN shall mean the Corporation's 2000 Employee Stock
Purchase Plan, as set forth in this document.

                  O. PLAN ADMINISTRATOR shall mean the committee of two (2) or
more Board members appointed by the Board to administer the Plan.

                  P. PURCHASE DATE shall mean the last business day of each
Purchase Interval. The initial Purchase Date shall be October 31, 2000.

                  Q. PURCHASE INTERVAL shall mean each successive six (6)-month
period within a particular offering period at the end of which there shall be
purchased shares of Common Stock on behalf of each Participant.

                  R. STOCK EXCHANGE shall mean either the American Stock
Exchange or the New York Stock Exchange.

                  S. UNDERWRITING AGREEMENT shall mean the agreement between the
Corporation and the underwriter or underwriters managing the initial public
offering of the Common Stock.


                                      A-3.


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