DIVERSA CORP
S-1/A, 2000-02-11
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>


 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 11, 2000
                                                      REGISTRATION NO. 333-92853

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                              AMENDMENT NO. 5
                                       TO
                                    FORM S-1

                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

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

                              DIVERSA CORPORATION
                        (NAME OF ISSUER IN ITS CHARTER)

<TABLE>
<CAPTION>
             DELAWARE                               8731                            22-3297375
 <S>                                 <C>                                <C>
   (STATE OR OTHER JURISDICTION         (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
 OF INCORPORATION OR ORGANIZATION)       CLASSIFICATION CODE NUMBER)            IDENTIFICATION NO.)
</TABLE>

                           10665 SORRENTO VALLEY ROAD
                              SAN DIEGO, CA 92121
                                 (858) 623-5106
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

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

                              JAY M. SHORT, PH.D.
                            CHIEF EXECUTIVE OFFICER
                              DIVERSA CORPORATION
                           10665 SORRENTO VALLEY ROAD
                              SAN DIEGO, CA 92121
                                 (858) 623-5106
             (NAME, ADDRESS, TELEPHONE NUMBER OF AGENT FOR SERVICE)

                                   COPIES TO:
<TABLE>
<S>                                                <C>
        M. WAINWRIGHT FISHBURN, JR., ESQ.                        FAYE H. RUSSELL, ESQ.
            NANCY DENYES KRUEGER, ESQ.                           MARIA P. SENDRA, ESQ.
              DAVID B. BERGER, ESQ.                         BROBECK, PHLEGER & HARRISON LLP
                COOLEY GODWARD LLP                                550 WEST "C" STREET
         4365 EXECUTIVE DRIVE, SUITE 1100                     SAN DIEGO, CALIFORNIA 92101
           SAN DIEGO, CALIFORNIA 92121                               (619) 234-1966
                  (858) 550-6000
</TABLE>

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

        Approximate date of commencement of proposed sale to the public:
   AS SOON AS PRACTICABLE AFTER THE REGISTRATION STATEMENT BECOMES EFFECTIVE.

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

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

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

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

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

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

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

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

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

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

              SUBJECT TO COMPLETION, DATED FEBRUARY 11, 2000

PRELIMINARY PROSPECTUS

                                7,000,000 SHARES


                               [LOGO OF DIVERSA]

                                  COMMON STOCK

                                  -----------

This is an initial public offering of 7,000,000 shares of common stock of
Diversa Corporation. We are selling all of the shares of common stock offered
under this prospectus.

We expect the public offering price for our common stock to be between $20.00
and $22.00 per share. There is currently no public market for our common stock.
We have applied to have our common stock approved for listing on the Nasdaq
National Market under the symbol "DVSA."

SEE "RISK FACTORS" BEGINNING ON PAGE 5 TO READ ABOUT RISKS THAT YOU SHOULD
CONSIDER BEFORE BUYING SHARES OF OUR COMMON STOCK.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY OTHER REGULATORY BODY
HAS APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED ON THE ADEQUACY OR
ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.

                                  -----------

<TABLE>
<CAPTION>
                                                                Per
                                                               Share    Total
                                                              -------- --------
<S>                                                           <C>      <C>
Public offering price........................................ $        $
Underwriting discounts and commissions....................... $        $
Proceeds to Diversa.......................................... $        $
</TABLE>

                                  -----------

We have granted the underwriters a 30-day option to purchase up to an
additional 1,050,000 shares of common stock from us at the initial public
offering price less the underwriting discount.

The underwriters are severally underwriting the shares being offered. The
underwriters expect to deliver the shares in New York, New York, on
               , 2000.

                                  -----------

BEAR, STEARNS & CO. INC.

                  CHASE H&Q

                        DEUTSCHE BANC ALEX. BROWN

             The date of this prospectus is                  , 2000
<PAGE>


                                [GATEFOLD COVER]

[Gatefold Cover: A diagram entitled "Diversa: Innovation from BioDiversity and
Gene Evolution" depicting alternative ecosystems, progressing to multiple
images depicting the discovery, development and manufacture of novel enzymes
and other biologically active compounds through our proprietary processes and
technologies, which then leads to photographs representing our four target
markets.

[Inside Front Cover: Heading reading "Diversa Corporation discovers and
develops novel enzymes and other biologically active compounds from diverse
environmental sources for use in agricultural, chemical processing, industrial
and pharmaceutical applications. We have commercialized our first product for
the industrial market and have multiple projects in various stages of
development in our target markets," followed by a diagram representing our
discovery and evolution processes and technologies, which then leads to
photographs representing our four target markets.


<PAGE>

                               PROSPECTUS SUMMARY

                              DIVERSA CORPORATION

   You should read the following summary together with the more detailed
information regarding our company and our common stock being sold in this
offering and our financial statements and the notes to our financial statements
appearing elsewhere in this prospectus before making an investment decision.
You should also carefully consider the information discussed in "Risk Factors."

OUR BUSINESS AND TECHNOLOGIES

   We believe that we are a global leader in discovering and developing novel
enzymes and other biologically active compounds from diverse environmental
sources for use in agricultural, chemical processing, industrial and
pharmaceutical applications. Enzymes are proteins that catalyze, or facilitate,
one or more chemical reactions. Our processes significantly speed the discovery
and development of such commercially valuable new enzymes and biologically
active small molecules. For example, we launched our first product for an
industrial application within two years of project initiation. Our processes
are designed to help our strategic partners and customers reduce cost, reduce
waste, improve yield and enhance the quality of end products and manufacturing.
We believe that the integration of our capabilities differentiates us from our
competitors. We accomplish this integration utilizing our proprietary methods
in the following manner:

  .  We collect genetic material from organisms that have not previously been
     cultured in the laboratory found in diverse natural environments;

  .  We isolate, catalog and store genes and gene pathways, or groups of
     genes that produce enzymes that act together to synthesize a molecule,
     in vast DNA libraries;

  .  We screen these libraries to analyze more than a billion genes per day
     to identify potentially useful enzymes and compounds;

  .  We optimize these enzymes and compounds by applying our
     DirectEvolution(R) genetic modification technologies, including our Gene
     Site Saturation Mutagenesis(TM) and GeneReassembly(TM) technologies; and

  .  We develop novel host organisms for the manufacture of resulting
     products.

   We believe our ability to construct vast libraries from DNA samples
collected from organisms in diverse environments is an important factor of our
success. Our use of minute DNA samples results in minimal impact to the
surrounding environment and has enabled us to enter into numerous formal
genetic resource access agreements. We estimate that our environmental gene
libraries currently contain the complete genomes of over 1 million unique
microorganisms.

   Our ultra high-throughput screening technologies, such as SingleCell(TM)
screening, and our enrichment technologies, such as biopanning, allow for the
rapid discovery and identification of genes with desired biological activity or
specific DNA sequences. Our DirectEvolution technologies, Gene Site Saturation
Mutagenesis and GeneReassembly, enable us to modify the DNA sequences of genes
in order to optimize new genes for commercial applications. We use our Gene
Site Saturation Mutagenesis technology to create a family of related genes that
all differ from a parent gene by a single amino acid change at each defined
position. We use our GeneReassembly technologies for the reassembly of related
genes from two or more different species to create a large population of new
gene variants. The new genes created through these technologies can then be
screened for one or more desired characteristics.

   We intend to commercialize products discovered or developed utilizing our
technologies, both independently and in collaboration with strategic partners.
We have successfully commercialized our first product and we have 42 other
projects with multiple production applications in various stages of
development.

                                       1
<PAGE>

Our strategic partners are market leaders across multiple industries and
include Novartis Seeds AG, Novartis Agribusiness Biotechnology Research, Inc.,
The Dow Chemical Company, Rhone-Poulenc Animal Nutrition S.A. and Finnfeeds
International Limited. These partners typically fund research costs and provide
various types of payments, which may include exclusivity payments, technology
access and development payments, milestone payments, license and
commercialization fees and royalties. In addition to $10.7 million received
from inception through December 31, 1999, our partners are committed to fund at
least $68.0 million under existing agreements over the next five years. Our
partners have also invested $9.2 million in our equity securities.

OUR TARGET MARKETS AND PRODUCTS

   We are developing enzymes and other biologically active compounds for a
number of industries, including agricultural, chemical processing, industrial
and pharmaceutical applications. Our target markets provide both short-term and
long-term product revenue opportunities. Within these broad markets we are
targeting billion dollar key market segments where we believe our technologies
and products will create high value and competitive advantages for our
strategic partners and our customers. We are identifying and producing enzymes
that exhibit dramatic increases in activity, efficiency and stability. Examples
of our product applications include the following:

  .  In agriculture, we are developing a variety of specialty enzymes and
     engineered genes to improve crop protection, crop yield and nutritional
     value, as well as to reduce harmful environmental waste.

  .  In chemical processing, we are developing a variety of enzymes to create
     manufacturing efficiencies, reduce production costs and accelerate
     generation of new chemical products and processes.

  .  For industrial applications, we successfully commercialized a heat-
     tolerant enzyme useful for oil and gas recovery and are developing
     numerous products related to enzymatic processes for detergent, corn
     processing, textile, pulp and paper processing and fats and oils
     applications.

  .  In pharmaceuticals, we are working to discover small molecule compounds
     as candidates for anti-microbials, anti-fungals, anti-virals and other
     therapeutic drugs.

OUR STRATEGY

   Our goal is to be the leading provider of novel enzymes and biologically
active compounds for use in unique, economically attractive applications. The
key elements of our strategy are to:

  .  Protect and enhance our technology leadership position;

  .  Expand our existing DNA libraries through access to novel genetic
     material and utilize our proprietary technologies to discover new genes
     and gene pathways to provide solutions to market needs;

  .  Deploy our technologies across diverse markets in order to maximize our
     return on investment;

  .  Pursue additional strategic alliances with market leaders to access
     funding and industry-specific expertise and to more efficiently develop
     and commercialize a larger product portfolio; and

  .  Independently develop and commercialize products in selected markets to
     capture their full economic value.

                                       2
<PAGE>

                                  THE OFFERING

<TABLE>
<S>                                              <C>
Common stock offered by Diversa................. 7,000,000 shares
Common stock to be outstanding after the
 offering....................................... 32,811,401 shares
Use of proceeds................................. We intend to use the net proceeds from
                                                 this offering for research and
                                                 development, capital expenditures,
                                                 working capital, general corporate
                                                 purposes and possible future
                                                 acquisitions.
Proposed Nasdaq National Market symbol.......... DVSA
</TABLE>

The share amounts in this table are based on shares outstanding as of December
31, 1999. This table excludes:

  .  5,492,798 shares of our common stock reserved for issuance under our
     stock option plans of which 3,125,000 shares are subject to outstanding
     options with a weighted average exercise price of $1.73 per share and
     13,937 shares of common stock issuable upon exercise of an outstanding
     option granted outside our stock option plans with an exercise price of
     $0.03 per share;

  .  277,719 shares available for issuance under our Non-Employee Directors'
     Stock Option Plan;

  .  416,579 shares available for issuance under our 1999 Employee Stock
     Purchase Plan; and

  .  364,120 shares of common stock issuable upon exercise of outstanding
     warrants with a weighted average exercise price of $1.44 per share.

Except as otherwise indicated, information in this prospectus is based on the
following assumptions:

  .  the conversion of all outstanding shares of our preferred stock into
     22,834,011 shares of common stock upon the closing of this offering;

  .  the issuance of an estimated 32,000 shares of common stock to be issued
     at the closing of this offering to holders of our series A, B and D
     preferred stock as payment of a dividend that began to accrue on
     December 21, 1999;

  .  a 1-for-2.8806 reverse-split in our common stock that was effected on
     February 8, 2000; and

  .  no exercise of the underwriters' over-allotment option to purchase up to
     1,050,000 shares.

   DIVERSA, Gene Site Saturation Mutagenesis, GSSM, Pyrolase, GeneReassembly,
DiverseLibraries, PathwayLibraries, DirectEvolution(R), SingleCell and SciLect
are trademarks of Diversa Corporation. This prospectus also refers to trade
names and trademarks of other organizations.

                                       3
<PAGE>

                             SUMMARY FINANCIAL DATA

   The following financial information should be read together with the
"Selected Financial Information" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" included elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                         YEAR ENDED DECEMBER 31,
                                ----------------------------------------------
                                 1995      1996      1997      1998     1999
                                -------  --------  --------  --------  -------
                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                             <C>      <C>       <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
Total revenue.................  $    25  $    706  $  1,155  $  1,347  $10,272
Total operating expenses......    8,857    12,125    13,455    15,201   19,506
Operating loss................   (8,832)  (11,419)  (12,300)  (13,854)  (9,234)
Net loss......................   (8,904)  (11,646)  (12,392)  (13,510)  (9,019)
Net loss applicable to common
 stockholders.................  $(8,904) $(11,646) $(12,392) $(13,510) $(9,085)
                                =======  ========  ========  ========  =======
Historical net loss per share,
 basic and diluted............  $ (7.37) $  (7.68) $  (7.72) $  (7.64) $ (3.86)
                                =======  ========  ========  ========  =======
Historical weighted average
 shares outstanding...........    1,208     1,517     1,606     1,768    2,353
Pro forma net loss per share..                                         $ (0.36)
                                                                       =======
Pro forma weighted average
 shares outstanding...........                                          25,187
</TABLE>

<TABLE>
<CAPTION>
                                                   AS OF DECEMBER 31, 1999
                                                ------------------------------
                                                            PRO    PRO FORMA
                                                 ACTUAL    FORMA   AS ADJUSTED
                                                --------  ------- ------------
                                                       (IN THOUSANDS)
<S>                                             <C>       <C>     <C>
BALANCE SHEET DATA:
Cash, cash equivalents and short term
 investments...................................  $ 5,084  $ 5,084   $140,594
Working capital................................   13,902   13,902    149,412
Total assets...................................   31,072   31,072    167,412
Capital lease obligations, less current
 portion.......................................    2,677    2,677      2,677
Redeemable convertible preferred stock.........   48,402      --         --
Stockholders' equity (deficit).................  (42,813)   5,589    141,099
</TABLE>

   Pro forma net loss per share assumes all our preferred stock had been
converted into common stock on the date of original issuance. See our financial
statements for a more detailed description.

   Pro forma balance sheet data assumes the conversion of all our outstanding
preferred stock into common stock in conjunction with the closing of this
offering.

   The pro forma as adjusted balance sheet data above reflect the sale of
7,000,000 shares of our common stock in this offering at an assumed initial
public offering price of $21.00 per share after deducting estimated
underwriting discounts and commissions and estimated expenses of this offering,
the conversion of all outstanding preferred stock into common stock and the
issuance of an estimated 32,000 shares of common stock to be issued at the
closing of this offering to holders of our series A, B and D preferred stock as
payment of a dividend that began to accrue on December 21, 1999. See "Use of
Proceeds" and "Capitalization" for a discussion about how we intend to use the
proceeds from this offering and about our capitalization.

                                       4
<PAGE>

                                  RISK FACTORS

   You should carefully consider the risks described below before making an
investment decision. The risks and uncertainties described below are not the
only ones facing our company. Additional risks and uncertainties not presently
known to us or that we currently consider immaterial may also impair our
operations. If any of the following risks actually occurs, our business could
be harmed. In that case, the trading price of our common stock could decline,
and you may lose all or part of your investment.

WE HAVE A HISTORY OF NET LOSSES, WE EXPECT TO CONTINUE TO INCUR NET LOSSES AND
WE MAY NOT ACHIEVE OR MAINTAIN PROFITABILITY.

   We have incurred net losses since our inception, including a net loss of
approximately $11.8 million for the year ended December 31, 1998 and
approximately $10.5 million for the year ended December 31, 1999. As of
December 31, 1999, we had an accumulated deficit of approximately $56.4
million. We expect to incur additional losses for at least the next several
years. The extent of our future losses will depend, in part, on the rate of
growth, if any, in our contract revenue and on the level of our expenses. To
date, substantially all of our revenue has been derived from strategic
alliances and grants, and we expect that substantially all of our revenue for
the foreseeable future will result from payments from strategic alliances.

   Future revenue from strategic alliances are uncertain because our ability to
generate revenue will depend upon our ability to enter into new strategic
alliances and to meet research, development and commercialization objectives
under new and existing agreements. We expect to spend significant amounts to
fund research and development and enhance our core technologies. As a result,
we expect that our operating expenses will increase significantly in the near
term, and, consequently, we will need to generate significant additional
revenue to achieve profitability. In order for us to generate revenue, we must
not only retain our existing strategic partners and attract new ones, but also
develop products or technologies that our partners choose to commercialize and
from which we can derive revenue through royalties. Even if we do achieve
profitability, we may not be able to sustain or increase profitability on a
quarterly or annual basis.

BECAUSE WE ARE AN EARLY STAGE COMPANY DEVELOPING AND DEPLOYING NEW
TECHNOLOGIES, WE MAY NOT BE ABLE TO COMMERCIALIZE OUR TECHNOLOGIES OR PRODUCTS,
WHICH COULD CAUSE US TO BE UNPROFITABLE OR CEASE OPERATIONS.

   You must evaluate our business in light of the uncertainties and
complexities affecting an early stage biotechnology company. Our existing
proprietary technologies are new and in the early stage of development. We may
not be successful in the commercial development of these or any further
technologies or products. Successful products require significant development
and investment, including testing, to demonstrate their cost-effectiveness
prior to regulatory approval and commercialization. To date, we have
commercialized only one product, Pyrolase 160, and none of our strategic
partners have yet incorporated our technologies or inventions into their own
commercial products from which we can generate royalties. Because of these
uncertainties, our discovery process may not result in the identification of
product candidates that we or our strategic partners will commercialize. If we
are not able to use our technologies to discover new materials or products with
significant commercial potential, we will not be able to achieve our objectives
or build a sustainable or profitable business.

WE ARE DEPENDENT ON OUR STRATEGIC PARTNERS, AND OUR FAILURE TO SUCCESSFULLY
MANAGE OUR EXISTING AND FUTURE STRATEGIC ALLIANCE RELATIONSHIPS COULD PREVENT
US FROM DEVELOPING AND COMMERCIALIZING MANY OF OUR PRODUCTS AND ACHIEVING OR
SUSTAINING PROFITABILITY.

   We currently have strategic alliance agreements with Novartis Seeds AG,
Novartis Agribusiness Biotechnology Research, Inc. and The Dow Chemical
Company, from which we expect to derive significant future revenue. Since we do
not currently possess the resources necessary to independently develop and
commercialize all of the potential products that may result from our
technologies, we expect to continue to

                                       5
<PAGE>

enter into, and in the near-term derive additional revenue from, strategic
alliance agreements to develop and commercialize products. We will have limited
or no control over the resources that any strategic partner may devote to our
products. Any of our present or future strategic partners may not perform their
obligations as expected. These strategic partners may breach or terminate their
agreements with us or otherwise fail to conduct their collaborative activities
successfully and in a timely manner. Further, our strategic partners may not
develop products arising out of our collaborative arrangements or devote
sufficient resources to the development, manufacture, marketing or sale of
these products. If we fail to enter into or maintain strategic alliance
agreements, or if any of these events occur, we may not be able to
commercialize our products, grow our business or generate sufficient revenue to
support our operations. Our present or future strategic alliance opportunities
could be harmed if:

  .  We do not achieve our research and development objectives under our
     strategic alliance agreements;

  .  We develop products and processes or enter into additional strategic
     alliances that could conflict with the business objectives of our
     strategic partners;

  .  We disagree with our strategic partners as to rights to intellectual
     property we develop;

  .  We are unable to manage multiple simultaneous strategic alliances;

  .  Our strategic partners become competitors of ours or enter into
     agreements with our competitors;

  .  Consolidation in our target markets limits the number of potential
     strategic partners; or

  .  We are unable to negotiate additional agreements having terms
     satisfactory to us.

WE DO NOT HAVE THE CAPACITY TO MANUFACTURE PRODUCTS ON A COMMERCIAL SCALE. IF
WE ARE UNABLE TO ACCESS THE CAPACITY TO MANUFACTURE PRODUCTS IN SUFFICIENT
QUANTITY, WE MAY NOT BE ABLE TO COMMERCIALIZE OUR PRODUCTS OR GENERATE
SIGNIFICANT SALES.

   We have only limited experience in enzyme manufacturing and we do not have
our own capacity to manufacture products on a commercial scale. We expect to be
dependent to a significant extent on third parties for commercial scale
manufacturing of our products. We have arrangements with a third party that has
the required manufacturing equipment and available capacity to manufacture
Pyrolase 160 under our direction and oversight. We also currently lease a pilot
facility for process development activities from a third party, which we intend
to vacate by March 2000. We plan to construct our own pilot development
facility during 2000 and have identified alternative capacity to meet interim
requirements. In addition to requiring investment in equipment, construction of
this new facility will necessitate compliance with applicable regulations.
After we complete the construction of our pilot facility, we will continue to
depend on third parties for large-scale commercial manufacturing. If we fail to
complete the construction of our pilot facility on time or at all, it could
interrupt our research and product development programs and harm our
relationships with strategic partners. Any difficulties or interruptions of
service with our third party manufacturers or our own planned pilot
manufacturing facility could disrupt our research and development efforts,
delay our commercialization of products and harm our relationships with our
strategic partners or customers.

WE HAVE ONLY LIMITED EXPERIENCE IN INDEPENDENTLY DEVELOPING, MANUFACTURING,
MARKETING, SELLING AND DISTRIBUTING COMMERCIAL PRODUCTS.

   We intend to pursue some product opportunities independently. We currently
have only limited resources and capability to develop, manufacture, market,
sell or distribute products on a commercial scale. We will determine which
products to pursue independently based on various criteria, including:
investment required, estimated time to market, regulatory hurdles,
infrastructure requirements and industry-specific expertise necessary for
successful commercialization. At any time, we may modify our strategy and
pursue alliances for the development and commercialization of some products. We
may pursue products that ultimately require more resources than we anticipate
or which may be technically unsuccessful. In order for us to commercialize
these products directly, we would need to establish or obtain through
outsourcing arrangements the capability to develop, manufacture, market, sell
and distribute products. If we are unable to successfully commercialize

                                       6
<PAGE>

products resulting from our internal product development efforts, we will
continue to incur losses. Even if we successfully develop a commercial product,
we may not generate significant sales and achieve profitability.

ETHICAL, LEGAL AND SOCIAL CONCERNS ABOUT GENETICALLY ENGINEERED PRODUCTS COULD
LIMIT OR PREVENT THE USE OF OUR PRODUCTS AND TECHNOLOGIES AND LIMIT OUR
REVENUE.

   Some of our products are genetically engineered. If we are not able to
overcome the ethical, legal and social concerns relating to genetic
engineering, our products may not be accepted. Any of the risks discussed below
could result in expenses, delays or other impediments to our programs or the
public acceptance and commercialization of products dependent on our
technologies or inventions. Our ability to develop and commercialize one or
more of our technologies and products could be limited by the following
factors:

  .  Public attitudes about the safety and environmental hazards of, and
     ethical concerns over, genetic research and genetically engineered
     products, which could influence public acceptance of our technologies
     and products;

  .  Public attitude regarding, and potential changes to laws governing,
     ownership of genetic material which could harm our intellectual property
     rights with respect to our genetic material and discourage strategic
     partners from supporting, developing or commercializing our products and
     technologies; and

  .  Governmental reaction to negative publicity concerning genetically
     modified organisms, which could result in greater government regulation
     of genetic research and derivative products, including labeling
     requirements.

   The subject of genetically modified organisms has received negative
publicity, which has aroused public debate. The adverse publicity could lead to
greater regulation and trade restrictions on imports of genetically altered
products.

IF WE ARE UNABLE TO CONTINUE TO COLLECT GENETIC MATERIAL FROM DIVERSE NATURAL
ENVIRONMENTS, OUR RESEARCH AND DEVELOPMENT EFFORTS AND OUR PRODUCT DEVELOPMENT
PROGRAMS COULD BE HARMED.

   We collect genetic material from organisms found in diverse environments. We
collect material from government-owned land in foreign countries and in areas
of the United States under formal resource access agreements, and from private
lands under individual agreements with private land owners. If our access to
materials under access agreements or other arrangements terminates, it could
harm our internal and our collaborative research and development efforts. We
also collect samples from other environments where agreements are currently not
required, such as the deep sea. All of our agreements with foreign countries
expire in 2002 or earlier, and they are all subject to earlier termination. Our
access agreement with Iceland was terminated, and we have voluntarily ceased
collections of further samples in Yellowstone National Park pending their
resolution of collection guidelines.

OUR ABILITY TO COMPETE IN THE MARKET MAY DECLINE IF WE DO NOT ADEQUATELY
PROTECT OUR PROPRIETARY TECHNOLOGIES OR IF WE LOSE SOME OF OUR INTELLECTUAL
PROPERTY RIGHTS DUE TO BECOMING INVOLVED IN EXPENSIVE LAWSUITS OR
ADMINISTRATIVE PROCEEDINGS.

   Our intellectual property consists of patents, copyrights, trade secrets,
know-how and trademarks. As of January 15, 2000, we owned 24 issued patents
relating to our technologies, had received notices of allowance with respect to
7 other patent applications and have over 125 patents pending. In addition, as
of January 15, 2000, we had in-licensed more than 25 additional patents or
patent applications that we believe strengthen our patent portfolio. Our
success depends in part on our ability to obtain patents and maintain adequate
protection of our other intellectual property for our technologies and products
in the United States and other countries. The laws of some foreign countries do
not protect proprietary rights to the same extent as the laws of the United
States, and many companies have encountered significant problems in protecting
their proprietary rights

                                       7
<PAGE>

in these foreign countries. These problems can be caused by, for example, a
lack of rules and methods for defending intellectual property rights.

   Our commercial success depends on neither infringing patents and proprietary
rights of third parties, nor breaching any licenses or other agreements that we
have entered into with regard to our technologies, products and business. The
patent positions of biotechnology companies, including our patent position,
involve complex legal and factual questions and, therefore, enforceability
cannot be predicted with certainty. We will apply for patents covering both our
technologies and products as we deem appropriate. Patents, if issued, may be
challenged, invalidated or circumvented. We cannot be sure that relevant
patents have not been issued that could block our ability to obtain patents or
to operate as we would like. Others may develop similar technologies or
duplicate technologies developed by us. We are aware of the existence of
patents in some countries that, if valid, may block our ability to
commercialize products in these countries if we are unsuccessful in
circumventing or acquiring the rights to these patents. We are also aware of
the existence of claims in published patent applications in some countries
that, if granted and valid, may also block our ability to commercialize
products in these countries if we are unable to circumvent or license them.

   We are not currently a party to any litigation with regard to our patent
position. However, the biotechnology industry is characterized by extensive
litigation regarding patents and other intellectual property rights. Many
biotechnology companies have employed intellectual property litigation as a way
to gain a competitive advantage. If we became involved in litigation or
interference proceedings declared by the United States Patent and Trademark
Office, or oppositions or other intellectual property proceedings outside of
the United States, to defend our intellectual property rights or as a result of
alleged infringement of the rights of others, we might have to spend
significant amounts of money. We are aware of a significant number of patents
and patent applications relating to aspects of our technologies filed by, and
issued to, third parties. Should any of our competitors have filed patent
applications or obtained patents that claim inventions also claimed by us, we
may have to participate in an interference proceeding declared by the relevant
patent regulatory agency to determine priority of invention and, thus, the
right to a patent for these inventions in the United States. Such a proceeding
could result in substantial cost to us even if the outcome is favorable. Even
if successful on priority grounds, an interference may result in loss of claims
based on patentability grounds raised in the interference. The litigation or
proceedings could divert our management time and efforts. Even unsuccessful
claims could result in significant legal fees and other expenses, diversion of
management time and disruption in our business. Uncertainties resulting from
initiation and continuation of any patent or related litigation could harm our
ability to compete.

   An adverse ruling arising out of any intellectual property dispute,
including an adverse decision as to the priority of our inventions, would
undercut or invalidate our intellectual property position. An adverse ruling
could also subject us to significant liability for damages, prevent us from
using processes or products, or require us to negotiate licenses to disputed
rights from third parties. Although patent and intellectual property disputes
in the biotechnology area are often settled through licensing or similar
arrangements, costs associated with these arrangements may be substantial and
could include ongoing royalties. Furthermore, necessary licenses may not be
available to us on satisfactory terms, if at all.

   We recently received a letter from a privately held biotechnology company
suggesting that we may want to consider licensing patents held by that third
party. We believe that we have defenses to any infringement claim with respect
to such patents. However, we cannot be certain that the third party will not
initiate litigation alleging that our technologies infringe claims of such
patent or that a court would not find such claims valid and infringed.

                                       8
<PAGE>

WE MAY ENCOUNTER DIFFICULTIES MANAGING OUR GROWTH, WHICH COULD ADVERSELY AFFECT
OUR RESULTS OF OPERATIONS.

   Our strategy includes entering into and working on simultaneous projects
across multiple industries. We increased the number of our employees from 74 at
December 31, 1998 to 102 at December 31, 1999 and expect to significantly
increase our rate of growth to meet our strategic objectives. If our growth
continues, it will continue to place a strain on us. Our ability to effectively
manage our operations, growth, and various projects requires us to continue to
improve our operational, financial and management controls, reporting systems
and procedures and to attract and retain sufficient numbers of talented
employees. We may not be able to successfully implement improvements to our
management information and control systems in an efficient or timely manner. In
addition, we may discover deficiencies in existing systems and controls.

CONFIDENTIALITY AGREEMENTS WITH EMPLOYEES AND OTHERS MAY NOT ADEQUATELY PREVENT
DISCLOSURE OF TRADE SECRETS AND OTHER PROPRIETARY INFORMATION.

   In order to protect our proprietary technology and processes, we also rely
in part on trade secret protection for our confidential and proprietary
information. We have taken security measures to protect our trade secrets and
proprietary information. These measures may not provide adequate protection for
our trade secrets or other proprietary information. Our policy is to execute
confidentiality agreements with our employees and consultants upon the
commencement of an employment or consulting arrangement with us. These
agreements generally require that all confidential information developed by the
individual or made known to the individual by us during the course of the
individual's relationship with us be kept confidential and not disclosed to
third parties. These agreements also generally provide that inventions
conceived by the individual in the course of rendering services to us shall be
our exclusive property. There can be no assurance that proprietary information
will not be disclosed, that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
our trade secrets or that we can meaningfully protect our trade secrets. Costly
and time-consuming litigation could be necessary to enforce and determine the
scope of our proprietary rights, and failure to obtain or maintain trade secret
protection could adversely affect our competitive business position.

MANY POTENTIAL COMPETITORS WHO HAVE GREATER RESOURCES AND EXPERIENCE THAN WE DO
MAY DEVELOP PRODUCTS AND TECHNOLOGIES THAT MAKE OURS OBSOLETE.

   The biotechnology industry is characterized by rapid technological change,
and the area of gene research is a rapidly evolving field. Our future success
will depend on our ability to maintain a competitive position with respect to
technological advances. Rapid technological development by others may result in
our products and technologies becoming obsolete.

   We face, and will continue to face, intense competition. We are not aware of
another company that has the scope and integration of technologies and
processes that we have. There are, however, a number of companies who compete
with us in various steps throughout our technology process. For example,
Terragen Discovery is involved in accessing organisms from diverse environments
for pharmaceutical applications. A number of companies are performing high-
throughput screening of molecules. Maxygen, Inc. and Evotech have alternative
evolution technologies. Integrated Genomics, Inc., Myriad Genetics, Inc.,
ArQule, Inc. and Aurora Biosciences Corporation perform screening, sequencing
and/or bioinformatics services. Novo Nordisk and Genencor International, Inc.
are involved in the development, overexpression, fermentation and purification
of enzymes. There are also a number of academic institutions involved in
various phases of our technology process. Many of these competitors have
significantly greater financial and human resources than we do. These
organizations may develop technologies that are superior alternatives to our
technologies. Further, our competitors may be more effective at implementing
their technologies for modifying DNA to develop commercial products.

                                       9
<PAGE>

   Any products that we develop through our technologies will compete in
multiple, highly competitive markets. Any products that we develop will compete
in highly competitive markets. Many of our potential competitors in these
markets have substantially greater financial, technical and marketing resources
than we do, and we cannot assure you that they will not succeed in developing
products that would render our products or those of our strategic partners
obsolete or noncompetitive. In addition, many of these competitors have
significantly greater experience than we do in their respective fields. Our
ability to compete successfully will depend on our ability to develop
proprietary products that reach the market in a timely manner and are
technologically superior to and/or are less expensive than other products on
the market. Current competitors or other companies may develop technologies and
products that are more effective than ours. Our technologies and products may
be rendered obsolete or uneconomical by technological advances or entirely
different approaches developed by one or more of our competitors. The existing
approaches of our competitors or new approaches or technology developed by our
competitors may be more effective than those developed by us.

STRINGENT LAWS AND REQUIRED GOVERNMENT APPROVALS COULD DELAY OUR INTRODUCTION
OF PRODUCTS.

   All phases, especially the field testing, production and marketing, of our
potential products are subject to significant federal, state, local and/or
foreign governmental regulation. Regulatory agencies may not allow us to
produce and/or market our products in a timely manner or under technically or
commercially feasible conditions, or at all, which could harm our business.

   In the United States, products for our target markets are regulated based on
their application, by either the FDA, the Environmental Protection Agency, or
EPA, or, in the case of plants and animals, the United States Department of
Agriculture, or USDA. The FDA regulates drugs, food and feed, as well as food
additives, feed additives and substances generally recognized as safe that are
used in the processing of food or feed. While substantially all of our projects
to date have focused on non-human applications of our technologies and products
outside of the FDA's review, in the future we may pursue strategic alliances
for further research and development of drug products for humans that would
require FDA approval before they could be marketed in the United States. In
addition, any drug product candidates must also be approved by the regulatory
agencies of foreign governments before any product can be sold in those
countries. Under current FDA policy, our products, or products of our strategic
partners incorporating our technologies or inventions, to the extent that they
come within the FDA's jurisdiction, may be subject to lengthy FDA reviews and
unfavorable FDA determinations if they raise safety questions which cannot be
satisfactorily answered, if results from pre-clinical or clinical trials do not
meet regulatory requirements or if they are deemed to be food additives whose
safety cannot be demonstrated. An unfavorable FDA ruling could be difficult to
resolve and could prevent a product from being commercialized. Even after
investing significant time and expenditures, we may not obtain regulatory
approval for any drug products. We have not submitted an investigational new
drug application for any product candidate, and no drug product candidate
developed with our technologies has been approved for commercialization in the
United States or elsewhere. The EPA regulates biologically derived chemical
substances not within the FDA's jurisdiction. An unfavorable EPA ruling could
delay commercialization or require modification of the production process
resulting in higher manufacturing costs, thereby making the product
uneconomical. In addition, the USDA may prohibit genetically engineered plants
from being grown and transported except under an exemption, or under controls
so burdensome that commercialization becomes impracticable. Our future products
may not be exempted by the USDA.

   The European regulatory process for these classes of biologically derived
products has been in a state of flux in the recent past, as the EU attempts to
replace country by country regulatory procedures with a consistent EU
regulatory standard in each case. Some country-by-country regulatory oversight
remains. Other than Japan, most other regions of the world generally find
adequate either a United States or a European clearance together with
associated data and information for a new biologically derived product.

                                       10
<PAGE>

IF WE REQUIRE ADDITIONAL CAPITAL TO FUND OUR OPERATIONS, WE MAY NEED TO ENTER
INTO FINANCING ARRANGEMENTS WITH UNFAVORABLE TERMS OR WHICH COULD ADVERSELY
AFFECT YOUR OWNERSHIP INTEREST AND RIGHTS AS COMPARED TO OUR OTHER
STOCKHOLDERS. IF SUCH FINANCING IS NOT AVAILABLE, WE MAY NEED TO CEASE
OPERATIONS.

   We currently anticipate that our available cash resources and receivables,
committed funding from strategic partners and the net proceeds from this
offering will be sufficient to meet our capital requirements for at least the
next two years. However, our capital requirements depend on several factors,
including:

  .  The level of research and development investment required to maintain
     our technology leadership position;


  .  Our ability to enter into new agreements with strategic partners or to
     extend the terms of our existing collaborative agreements, and the terms
     of any agreement of this type;

  .  The success rate of our discovery efforts associated with milestones and
     royalties;

  .  Our ability to successfully commercialize products developed
     independently and the demand for such products;

  .  The timing and willingness of strategic partners to commercialize our
     products that would result in royalties;

  .  Costs of recruiting and retaining qualified personnel; and

  .  Our need to acquire or license complementary technologies or acquire
     complementary businesses.

   If additional capital is required to operate our business, we cannot assure
you that additional financing will be available on terms favorable to us, or at
all. If adequate funds are not available or are not available on acceptable
terms, our ability to fund our operations, take advantage of opportunities,
develop products or technologies or otherwise respond to competitive pressures
could be significantly limited. In addition, if financing is not available, we
may need to cease operations.

   If we raise additional funds through the issuance of equity securities, the
percentage ownership of our stockholders will be reduced, stockholders may
experience additional dilution or such equity securities may provide for
rights, preferences or privileges senior to those of the holders of our common
stock. If we raise additional funds through the issuance of debt securities,
such debt securities would have rights, preferences and privileges senior to
holders of common stock and the terms of such debt could impose restrictions on
our operations.

WE EXPECT THAT OUR QUARTERLY RESULTS OF OPERATIONS WILL FLUCTUATE, AND THIS
FLUCTUATION COULD CAUSE OUR STOCK PRICE TO DECLINE, CAUSING INVESTOR LOSSES.

   Our quarterly operating results have fluctuated in the past and are likely
to do so in the future. These fluctuations could cause our stock price to
fluctuate significantly or decline. For example, our revenue for the year ended
December 31, 1999 was $10.3 million, as compared to $1.3 million for the same
period in 1998. This increase was primarily due to revenue from new strategic
alliances. Revenue in future periods may be greater or less than revenue in the
immediately preceding period or in the comparable period of the prior year.
Some of the factors that could cause our operating results to fluctuate
include:

  .  Termination of strategic alliances;

  .  The success rate of our discovery efforts associated with milestones and
     royalties;

  .  The ability and willingness of strategic partners to commercialize
     royalty-bearing products on expected timelines;

  .  Our ability to enter into new agreements with strategic partners or to
     extend the terms of our existing strategic alliance agreements, and the
     terms of any agreement of this type;

  .  Our ability to successfully satisfy all pertinent regulatory
     requirements;

                                       11
<PAGE>

  .  Our ability to successfully commercialize products developed
     independently and the demand for such products; and

  .  General and industry specific economic conditions, which may affect our
     strategic partners' research and development expenditures.

   If revenue declines or does not grow as anticipated due to the expiration of
strategic alliance agreements, failure to obtain new agreements or grants,
lower than expected royalty payments or other factors, we may not be able to
correspondingly reduce our operating expenses. A large portion of our expenses,
including expenses for facilities, equipment and personnel, are relatively
fixed. In addition, we plan to significantly increase operating expenses in
2000. Failure to achieve anticipated levels of revenue could therefore
significantly harm our operating results for a particular fiscal period.

   Due to the possibility of fluctuations in our revenue and expenses, we
believe that quarter-to-quarter comparisons of our operating results are not a
good indication of our future performance. Our operating results in some
quarters may not meet the expectations of stock market analysts and investors.
In that case, our stock price would probably decline.

IF WE LOSE OUR KEY PERSONNEL OR ARE UNABLE TO ATTRACT AND RETAIN QUALIFIED
PERSONNEL AS NECESSARY, IT COULD DELAY OUR PRODUCT DEVELOPMENT PROGRAMS AND
HARM OUR RESEARCH AND DEVELOPMENT EFFORTS.

   Our success depends to a significant degree upon the continued contributions
of our executive officers, management and scientific staff. If we lose the
services of one or more of these people, we may be unable to achieve our
business objectives or our stock price could decline. We may not be able to
attract or retain qualified employees in the future due to the intense
competition for qualified personnel among biotechnology and other technology-
based businesses, particularly in the San Diego area. If we are not able to
attract and retain the necessary personnel to accomplish our business
objectives, we may experience constraints that will adversely affect our
ability to meet the demands of our strategic partners in a timely fashion or to
support our internal research and development programs. In particular, our
product development programs depend on our ability to attract and retain highly
skilled scientists, including molecular biologists, biochemists and engineers.
Although we believe we will be successful in attracting and retaining qualified
personnel, competition for experienced scientists and other technical personnel
from numerous companies and academic and other research institutions may limit
our ability to do so on acceptable terms. All of our employees are at-will
employees, which means that either the employee or Diversa may terminate their
employment at any time.

   Our planned activities will require additional expertise in specific
industries and areas applicable to the products developed through our
technologies. These activities will require the addition of new personnel,
including management, and the development of additional expertise by existing
management personnel. The inability to acquire these services or to develop
this expertise could impair the growth, if any, of our business.

IF WE ENGAGE IN ANY ACQUISITION, WE WILL INCUR A VARIETY OF COSTS AND MAY
POTENTIALLY FACE NUMEROUS OTHER RISKS THAT COULD ADVERSELY AFFECT OUR BUSINESS
OPERATIONS.

   If appropriate opportunities become available, we may consider acquiring
businesses, technologies or products that we believe are a strategic fit with
our business. We currently have no commitments or agreements with respect to
any material acquisitions. If we do pursue such a strategy, we could:

  .  Issue equity securities which would dilute current stockholders'
     percentage ownership;

  .  Incur substantial debt; or

  .  Assume contingent liabilities.

   We may not be able to successfully integrate any businesses, products,
technologies or personnel that we might acquire in the future without a
significant expenditure of operating, financial and management resources,

                                       12
<PAGE>

if at all. In addition, future acquisitions might negatively impact our
business relations with our strategic partners. Further, recent proposed
accounting changes could result in a negative impact on our results of
operations as well as the resulting cost of the acquisition. Any of these
adverse consequences could harm our business.

WE MAY BE SUED FOR PRODUCT LIABILITY.

   We may be held liable if any product we develop, or any product which is
made with the use of any of our technologies, causes injury or is found
otherwise unsuitable during product testing, manufacturing, marketing or sale.
We currently have no product liability insurance. When we attempt to obtain
product liability insurance, this insurance may be prohibitively expensive, or
may not fully cover our potential liabilities. Inability to obtain sufficient
insurance coverage at an acceptable cost or otherwise to protect against
potential product liability claims could prevent or inhibit the
commercialization of products developed by us or our strategic partners. If we
are sued for any injury caused by our products, our liability could exceed our
total assets.

WE ARE SUBJECT TO ANTI-TAKEOVER PROVISIONS IN OUR CERTIFICATE OF INCORPORATION,
BYLAWS AND DELAWARE LAW THAT COULD DELAY OR PREVENT AN ACQUISITION OF OUR
COMPANY, EVEN IF THE ACQUISITION WOULD BE BENEFICIAL TO OUR STOCKHOLDERS.

   Provisions of our certificate of incorporation, our bylaws and Delaware law
could make it more difficult for a third party to acquire us, even if doing so
would be beneficial to our stockholders. These provisions could discourage
potential take-over attempts and could adversely affect the market price of our
common stock. Because of these provisions, you might not be able to receive a
premium on your investment.

THERE IS NO PRIOR MARKET FOR OUR COMMON STOCK, AND YOU MAY NOT BE ABLE TO
RESELL YOUR SHARES AT OR ABOVE THE INITIAL OFFERING PRICE.

   Prior to this offering, there has been no public market for shares of our
common stock. An active, liquid trading market may not develop following
completion of this offering, or if developed, may not be maintained. We will
determine the initial public offering price for the shares through negotiations
between us and representatives of the underwriters. This price may not be
indicative of prices that will prevail later in the trading market. The market
price of the common stock may decline below the initial public offering price,
and you may not be able to resell your shares at or above the initial public
offering price.

OUR STOCK PRICE MAY BE PARTICULARLY VOLATILE BECAUSE OF THE INDUSTRY WE ARE IN.

   The stock market, from time to time, has experienced significant price and
volume fluctuations that are unrelated to the operating performance of
companies. The market prices of technology companies, particularly life science
companies, have been highly volatile. Our stock may be affected by this type of
market volatility, as well as by our own performance. The following factors,
among other risk factors, may have a significant effect on the market price of
our common stock:

  .  Developments in our relationships with current or future strategic
     partners;

  .  Announcements of technological innovations or new products by us or our
     competitors;

  .  Developments in patent or other proprietary rights;

  .  Our ability to access genetic material from diverse ecological
     environments and practice our technologies;

  .  Future royalties from product sales, if any, by our strategic partners;

  .  Fluctuations in our operating results;

  .  Litigation;

  .  Developments in domestic and international governmental policy or
     regulation; and

  .  Economic and other external factors or other disaster or crisis.

                                       13
<PAGE>

FUTURE SALES OF OUR COMMON STOCK COULD CAUSE OUR STOCK PRICE TO DECLINE.

   The market price of our common stock could decline as a result of sales by
our existing stockholders of a large number of shares of our common stock in
the public market after the closing of this offering, or the perception that
these sales could occur. These sales could make it more difficult for us to
sell equity securities in the future at a time and price that we deem
appropriate. After this offering, we will have outstanding 32,811,401 shares of
common stock. All the shares sold in this offering will be freely tradeable. Of
the remaining 25,811,401 shares of common stock outstanding after this
offering, all of such shares will be eligible for sale in the public market
beginning 180 days after the date of this prospectus. After this offering we
also intend to register up to approximately 6,187,096 shares of our common
stock for sale upon exercise of outstanding stock options issued pursuant to
compensatory benefit plans or reserved for future issuance pursuant to our 1997
Equity Incentive Plan, 1999 Non-Employee Directors' Stock Option Plan and 1999
Employee Stock Purchase Plan. In addition, the market price of our common stock
could decline if we sell additional equity securities in connection with
financings or strategic alliance arrangements.

CONCENTRATION OF OWNERSHIP AMONG OUR EXISTING OFFICERS, DIRECTORS AND PRINCIPAL
STOCKHOLDERS MAY PREVENT OTHER STOCKHOLDERS FROM INFLUENCING SIGNIFICANT
CORPORATE DECISIONS AND DEPRESS OUR STOCK PRICE.

   After this offering, our officers, directors and stockholders with at least
5% of our stock will together control approximately 54.5% of our outstanding
common stock. If these officers, directors and principal stockholders act
together, they will be able to exert a significant degree of influence over our
management and affairs and over matters requiring stockholder approval,
including the election of directors and approval of mergers or other business
combination transactions. The interests of this concentration of ownership may
not always coincide with our interests or the interests of other stockholders.
For instance, officers, directors and principal stockholders, acting together,
could cause us to enter into transactions or agreements that we would not
otherwise consider. Similarly, this concentration of ownership may have the
effect of delaying or preventing a change in control of our company otherwise
favored by our other stockholders. This concentration of ownership could
depress our stock price.

AS A NEW INVESTOR, YOU WILL EXPERIENCE IMMEDIATE AND SUBSTANTIAL DILUTION IN
THE NET TANGIBLE BOOK VALUE OF YOUR SHARES.

   We expect the initial public offering price to be substantially higher than
the net tangible book value per share of the common stock. Therefore, if you
purchase shares of our common stock in this offering, you will incur immediate
and substantial dilution in pro forma net tangible book value of $16.78 per
share. You may incur additional dilution if the holders of outstanding options
or warrants exercise those options or warrants. Additional information
regarding the dilution to investors in this offering is included in this
prospectus under the heading "Dilution."

WE USE HAZARDOUS MATERIALS IN OUR BUSINESS. ANY CLAIMS RELATING TO IMPROPER
HANDLING, STORAGE OR DISPOSAL OF THESE MATERIALS COULD BE TIME CONSUMING AND
COSTLY.

   Our research and development processes involve the controlled use of
hazardous materials, including chemical, radioactive and biological materials.
Our operations also produce hazardous waste products. We cannot eliminate
entirely the risk of accidental contamination or discharge and any resultant
injury from these materials. Federal, state and local laws and regulations
govern the use, manufacture, storage, handling and disposal of these materials.
We may be sued for any injury or contamination that results from our use or the
use by third parties of these materials, and our liability may exceed our total
assets. In addition, compliance with applicable environmental laws and
regulations may be expensive, and current or future environmental regulations
may impair our research, development or production efforts.

                                       14
<PAGE>

YEAR 2000 ISSUES COULD RESULT IN THE INTERRUPTION OF OUR BUSINESS AND
NEGATIVELY IMPACT OUR OPERATING RESULTS.

   We have completed our assessment of the year 2000 readiness of our core
information technology systems. Through this process, we contacted key external
suppliers of software applications and computer systems to coordinate the
evaluation of potential year 2000 issues. To date, we have not encountered any
material year 2000 problems with software and information systems provided to
us by third parties. We completed minor remediation with regard to software
programs, hardware and microprocessor-controlled equipment. We did not
experience any year 2000 problems. However, we believe that it is not possible
to determine with complete certainty that all year 2000 problems affecting us
have been identified or will be corrected. The number of devices and systems
that could be affected and the interactions among these devices and systems are
too numerous to address.

   No one can accurately predict which year 2000 problem-related failures will
occur, or the severity, timing, duration or financial consequences of these
potential failures. If year 2000 problems significantly impact our strategic
partners, it could delay our research programs and the commercialization of
products, if any. Business disputes alleging that we failed to comply with the
terms of contracts or industry standards of performance could result in
litigation or contract termination. We could also lose future revenue as a
result of network, software or hardware failures. We also could be materially
adversely affected if third parties, upon whom we depend in order to run our
day-to-day business, experience year 2000 problems. For example, if our
supplier of electricity has not made appropriate year 2000 corrections, we
could experience a power outage and, consequently an interruption of our
research and development.

                                       15
<PAGE>

             SPECIAL STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

   This prospectus contains forward-looking statements that relate to future
events or our future financial performance. In some cases, you can identify
forward-looking statements by terminology such as "may," "will," "should,"
"expect," "plan," "anticipate," "believe," "estimate," "predict," "intend,"
"potential" or "continue" or the negative of these terms or other comparable
terminology. These statements are only predictions. Actual events or results
may differ materially. In evaluating these statements, you should specifically
consider various factors, including the risks described above and in other
parts of this prospectus. These factors may cause our actual results to differ
materially from any forward-looking statement.

                                USE OF PROCEEDS

   We estimate that our net proceeds from this offering will be approximately
$135.5 million, based upon an assumed initial public offering price of $21.00
per share, after deducting estimated underwriting discounts and estimated
offering expenses. If the underwriters' over-allotment option is exercised in
full, we estimate that net proceeds will be $156.0 million.

   We intend to use the net proceeds of this offering for research and
development, capital expenditures, working capital and general corporate
purposes. Additionally, a portion of the proceeds may be used for possible
future acquisitions. We are not currently a party to any contracts or letters
of intent with respect to any acquisitions. Pending such uses, the net proceeds
of this offering will be invested in short-term, interest-bearing, investment-
grade securities.

                                DIVIDEND POLICY

   We paid dividends of approximately $31,000 in 1995 and approximately $66,000
in 1997 to our series I preferred stockholders. These dividends were paid
pursuant to an agreement related to interest income on escrowed funds, and did
not represent a dividend from operating results. Pursuant to our certificate of
incorporation, our series A, B and D preferred stockholders are entitled to
receive a 5% dividend per annum from December 21, 1999 through the date of
completion of this offering. As of December 31, 1999, we have accrued $66,000
related to those dividends, and will accrue approximately $6,500 per day in
additional dividends for each day between January 1, 2000 and the completion of
this offering. We are entitled to pay this dividend in cash or in shares of
common stock valued at the initial public offering price. We intend to pay
these dividends in shares of our common stock and estimate that 32,000 shares
of common stock will be issued to satisfy this obligation. The annual dividend
is $0.05 per share of series A preferred stock, $0.033 per share of series B
preferred stock and $0.0425 per share of series D preferred stock. We presently
intend to retain future earnings, if any, to finance the expansion of our
business and do not expect to pay any cash dividends in the foreseeable future.
Any future determination to pay cash dividends will be at the discretion of our
board of directors and will be dependent upon our financial condition, results
of operations, capital requirements, general business conditions and other
factors that the board of directors may deem relevant.

                             CORPORATE INFORMATION

   We were incorporated in the State of Delaware in December 1992 under the
name Industrial Genome Sciences, Inc. In August 1997, we changed our name to
Diversa Corporation.

   Our executive offices are located at 10665 Sorrento Valley Road, San Diego,
California 92121, and our telephone number is (858) 453-7020. Our web site is
http://www.diversa.com. The information found on our web site is not a part of
this prospectus.

                                       16
<PAGE>

                                 CAPITALIZATION

   You should read this table in conjunction with "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and the financial
statements and the notes to those statements included elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                                      AS OF DECEMBER 31, 1999
                                                     ---------------------------
                                                                       PRO FORMA
                                                                PRO       AS
                                                     ACTUAL    FORMA   ADJUSTED
                                                     -------  -------  ---------
                                                       (IN THOUSANDS, EXCEPT
                                                            SHARE DATA)
<S>                                                  <C>      <C>      <C>
Cash, cash equivalents and short-term investments..  $ 5,084  $ 5,084  $140,594
                                                     =======  =======  ========
Capital lease obligations, less current portion....  $ 2,677  $ 2,677  $  2,677
                                                     -------  -------  --------
Redeemable convertible preferred stock, par value
 $0.001; 60,718,183 shares authorized; 60,220,183
 shares issued and outstanding (actual); no shares
 authorized, issued or outstanding (pro forma and
 pro forma as adjusted)............................   48,402      --        --
Stockholders' equity (deficit):
 Series E convertible preferred stock, par value
  $0.001; 5,555,556 shares authorized, issued and
  outstanding (actual) 5,000,000 preferred stock
  shares authorized, no shares issued or
  outstanding (pro forma and pro forma as
  adjusted)........................................        6      --        --
 Common stock, par value $0.001; 28,630,349 shares
  authorized, 2,945,390 shares issued and
  outstanding (actual); 65,000,000 shares
  authorized, 25,811,401 shares issued and
  outstanding (pro forma); 32,811,401 shares issued
  and outstanding (pro forma as adjusted)..........        3       26        33
 Additional paid-in capital........................   20,102   68,487   203,990
 Deferred compensation.............................   (5,520)  (5,520)   (5,520)
 Notes receivable from stockholders................      (36)     (36)      (36)
 Accumulated deficit...............................  (57,351) (57,351)  (57,351)
 Accumulated other comprehensive loss..............      (17)     (17)      (17)
                                                     -------  -------  --------
    Total stockholders' equity (deficit)...........  (42,813)   5,589   141,099
                                                     -------  -------  --------
    Total capitalization...........................  $ 8,266  $ 8,266  $143,776
                                                     =======  =======  ========
</TABLE>

   This table sets forth as of December 31, 1999:

  .  our actual capitalization;

  .  our pro forma capitalization, assuming the conversion of all of our
     outstanding preferred stock into common stock in conjunction with the
     closing of this offering;

  .  a 1-to-2.8806 reverse-split in our common stock that will take effect
     prior to the date of this offering;

  .  our pro forma as adjusted capitalization to give effect to the sale of
     7,000,000 shares of our common stock in this offering at an assumed
     initial public offering price of $21.00 per share after deducting
     estimated underwriting discounts and commissions and estimated expenses
     of this offering and the conversion of all of our outstanding preferred
     stock into common stock in conjunction with the closing of the initial
     public offering; and

  .  the issuance of an estimated 32,000 shares of common stock to be issued
     at the closing of this offering to holders of our series A, B and D
     preferred stock as payment of a dividend that began to accrue on
     December 21, 1999.

   This table excludes:

  .  5,492,798 shares of our common stock reserved for issuance under our
     stock option plans, of which 3,125,000 shares are subject to outstanding
     options with a weighted average exercise price of $1.73 per share and
     13,937 shares of common stock issuable upon exercise of an outstanding
     option granted outside of our stock option plans with an exercise price
     of $0.03 per share;

  .  277,719 shares available for issuance under our Non-Employee Directors'
     Stock Option Plan;

  .  416,579 shares available for issuance under our 1999 Employee Stock
     Purchase Plan; and

  .  364,120 shares of common stock issuable upon exercise of outstanding
     warrants with a weighted average exercise price of $1.44 per share.


                                       17
<PAGE>

                                    DILUTION

   Our historical net tangible book value deficit as of December 31, 1999 was
approximately $45.3 million, or ($15.38) per share, based on the number of
common shares outstanding as of December 31, 1999. Historical net tangible book
value per share is equal to the amount of our total tangible assets less total
liabilities, divided by the number of shares of common stock outstanding as of
December 31, 1999.

   Our pro forma net tangible book value, as of December 31, 1999, was $3.1
million, or $0.12 per share of common stock, assuming the conversion of all
outstanding shares of preferred stock into shares of common stock. Pro forma
net tangible book value represents the amount of total tangible assets less
total liabilities, divided by the number of shares of common stock outstanding
after considering the conversion of all outstanding preferred stock into common
stock. After giving effect to our sale of common stock offered hereby at an
assumed initial public offering price of $21.00 per share, and our receipt of
the estimated net proceeds from the offering, our pro forma net tangible book
value as of December 31, 1999 would have been approximately $138.6 million, or
$4.22 per share. This represents an immediate increase in net tangible book
value of $4.10 per share to existing stockholders and an immediate dilution of
$16.78 per share to new investors. The following table illustrates this per
share dilution:

<TABLE>
<S>                                                              <C>      <C>
Assumed initial public offering price per share.................          $21.00
  Historical net tangible book value per share before the
   offering..................................................... $(15.38)
  Increase per share attributed to the conversion of preferred
   stock to common stock........................................   15.50
                                                                 -------
  Pro forma net tangible book value per share before the
   offering.....................................................    0.12
  Increase per share attributable to new investors..............    4.10
                                                                 -------
Pro forma net tangible book value per share after this
 offering.......................................................            4.22
                                                                          ------
Dilution per share to new investors.............................          $16.78
                                                                          ======
</TABLE>

   If the underwriters exercise their over-allotment in full, there will be an
increase in pro forma net tangible book value to $4.70 per share to existing
shareholders and an immediate dilution in pro forma net tangible book value of
$16.30 to new shareholders. Our existing shareholders would own 76.2% and our
new public investors would own 23.8% of the total number of shares of our
common stock outstanding after this offering.

   The following table summarizes, on a pro forma basis as of December 31,
1999, the differences between existing stockholders and the new investors with
respect to the number of shares of common stock purchased from us, the total
consideration paid and the average price per share paid before deducting the
underwriting discounts and commissions and our estimated offering expenses.

<TABLE>
<CAPTION>
                            SHARES PURCHASED  TOTAL CONSIDERATION
                           ------------------ -------------------- AVERAGE PRICE
                             NUMBER   PERCENT    AMOUNT    PERCENT   PER SHARE
                           ---------- ------- ------------ ------- -------------
<S>                        <C>        <C>     <C>          <C>     <C>
Existing stockholders..... 25,779,401   78.6% $ 58,604,000   28.5%    $ 2.27
New public investors......  7,000,000   21.4%  147,000,000   71.5%    $21.00
                           ----------  -----  ------------  -----
  Total................... 32,779,401  100.0% $205,604,000  100.0%
                           ==========  =====  ============  =====
</TABLE>

   The discussion and tables above assume no exercise of stock options or
warrants outstanding as of December 31, 1999. As of December 31, 1999, there
were options outstanding under our employee stock option plans to purchase a
total of 3,125,000 shares of common stock, with a weighted average exercise
price of $1.73 per share, 364,120 shares of common stock issuable upon the
exercise of outstanding warrants, with a weighted average exercise price of
$1.44 per share, and an option outstanding granted outside our stock option
plans to purchase 13,937 shares of common stock at $0.03 per share held by one
of our founders. To the extent that any of these options or warrants are
exercised, there will be further dilution to new investors.

                                       18
<PAGE>

                         SELECTED FINANCIAL INFORMATION

   The selected financial data set forth below with respect to the Company's
statements of operations for the years ended December 31, 1997, 1998 and 1999,
and with respect to the Company's balance sheets at December 31, 1998 and 1999
are derived from our financial statements that have been audited by Ernst &
Young LLP, which are included elsewhere in this prospectus, and are qualified
by reference to such financial statements. The statement of operations data for
the years ended December 31, 1995 and 1996 and the balance sheet data as of
December 31, 1995, 1996 and 1997 are derived from our audited financial
statements that are not included in this prospectus. The selected financial
information set forth below should be read in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
the Company's financial statements and related notes appearing elsewhere in
this prospectus.

<TABLE>
<CAPTION>
                                         YEAR ENDED DECEMBER 31,
                               -----------------------------------------------
                                1995      1996      1997      1998      1999
                               -------  --------  --------  --------  --------
                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                            <C>      <C>       <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
Collaborative revenue........  $    --  $    200  $    669  $    625  $  9,166
Grant and product revenue....       25       506       486       722     1,106
                               -------  --------  --------  --------  --------
  Total revenue..............       25       706     1,155     1,347    10,272
Operating expenses:
Research and development.....    5,306     6,496     8,195    10,665    12,149
Selling, general and
 administrative..............    3,551     4,465     5,260     4,536     7,357
Restructuring charge.........       --     1,164        --        --        --
                               -------  --------  --------  --------  --------
  Total operating expenses...    8,857    12,125    13,455    15,201    19,506
                               -------  --------  --------  --------  --------
Operating loss...............   (8,832)  (11,419)  (12,300)  (13,854)  ( 9,234)
Other income (expense).......      (72)     (227)      (92)      344       215
                               -------  --------  --------  --------  --------
Net loss.....................   (8,904)  (11,646)  (12,392)  (13,510)  ( 9,019)
Dividends payable to
 preferred stockholders......      --        --        --        --        (66)
Net loss applicable to common
 stockholders................  $(8,904) $(11,646) $(12,392) $(13,510) $( 9,085)
                               =======  ========  ========  ========  ========
Historical net loss per
 share, basic and diluted....  $ (7.37) $  (7.68) $  (7.72) $  (7.64) $  (3.86)
                               =======  ========  ========  ========  ========
Historical weighted average
 shares outstanding..........    1,208     1,517     1,606     1,768     2,353

Pro forma net loss per
 share.......................                                         $  (0.36)
                                                                      ========
Pro forma weighted average
 shares outstanding..........                                           25,187
<CAPTION>
                                           AS OF DECEMBER 31,
                               -----------------------------------------------
                                1995      1996      1997      1998      1999
                               -------  --------  --------  --------  --------
                                             (IN THOUSANDS)
<S>                            <C>      <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Cash, cash equivalents and
 short term investments......  $   622  $  5,040  $ 16,607  $  5,552  $  5,084
Working capital..............   (1,276)    3,584    13,540     2,470    13,902
Total assets.................    4,769     9,973    20,284     8,706    31,072
Capital lease obligations,
 less current portion........    2,213     1,725     1,500     2,202     2,677
Redeemable convertible
 preferred stock.............   10,595    26,182    48,402    48,402    48,402
Stockholders' equity
 (deficit)...................  (10,580)  (22,156)  (34,024)  (45,738)  (42,813)
</TABLE>

   See our financial statements for a description of the computation of the
historical and pro forma net loss per share and the number of shares used in
the historical and pro forma per share calculations in "Statement of Operations
Data" above.

                                       19
<PAGE>

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

   The following discussion should be read in conjunction with our financial
statements and the related notes to our financial statements and the other
financial information included elsewhere in this prospectus.

OVERVIEW

   We were founded in December 1992 and began operations in May 1994. We
believe that we are the global leader in discovering and developing novel
enzymes and other biologically active compounds from diverse environmental
sources for use in agricultural, chemical processing, industrial and
pharmaceutical applications. To date, we have generated revenue from research
collaborations, government grants and enzyme product sales. Our strategic
partners include Novartis Seeds AG, Novartis Agribusiness Biotechnology
Research, Inc., The Dow Chemical Company, Rhone-Poulenc Animal Nutrition S.A.
and Finnfeeds International Limited. Our current government grants are from the
National Institute of General Medical Sciences, the National Cancer Institute
and the National Institute of Environmental Health Sciences. Our enzyme product
sales to date are comprised of research kits and Pyrolase 160.

   We have dedicated substantial resources to the development of our
proprietary technologies, which include capabilities for sample collection from
the world's microbial populations, generation of environmental gene libraries,
screening of these libraries using ultra-high throughput methods capable of
analyzing more than a billion genes per day and optimization via our
DirectEvolution technologies.

   Our revenue has increased significantly since our inception, and for the
year ended December 31, 1999, we have experienced significant growth compared
to the year ended December 31, 1998. This increase was primarily attributable
to the addition of new strategic alliances, which included research funding and
technology access and development fees. Research funding is recognized as
revenue when the services are rendered. Revenue from technology access and
development fees is recognized over the term of the strategic alliance. Revenue
from milestone payments is recognized when the milestone is achieved. Our
strategic partners often pay us before we recognize the revenue, and these
payments are deferred until earned. As of December 31, 1999, we had current and
long-term deferred revenue totaling $19.6 million.

   We have incurred substantial operating losses since our inception. As of
December 31, 1999, our accumulated deficit was $57.3 million, and total
stockholders' equity, after considering the conversion of all outstanding
shares of preferred stock to common stock, was $5.6 million. We expect to incur
additional operating losses over the next few years as we continue to develop
our technologies and fund internal product research and development.

RESULTS OF OPERATIONS

Years Ended December 31, 1999 and 1998

   Revenue

   Our revenue increased $9.0 million to $10.3 million for the year ended
December 31, 1999 from $1.3 million for the year ended December 31, 1998. This
increase was primarily attributable to the addition of new strategic alliances
with Novartis Agribusiness Biotechnology Research, Inc. and The Dow Chemical
Company and, to a much lesser extent, the addition of new government grants and
enzyme product sales. Revenue from collaborations accounted for 89% of total
revenue for the year ended December 31, 1999 and for 46% of total revenue for
the year ended December 31, 1998.

   Research and Development Expenses

   Our research and development expenses increased $1.4 million to $12.1
million for the year ended December 31, 1999, from $10.7 million for the year
ended December 31, 1998. During 1999, our research efforts

                                       20
<PAGE>

were primarily focused on research associated with strategic alliance
agreements and continued work on internal products, whereas in 1998, we focused
significant resources on development of internal products and proprietary
technologies. 1999 expenses also increased over 1998 due to amortization of
deferred compensation, as discussed in the paragraphs below. We expect that our
research and development expenses will increase substantially to support our
collaborative research programs, internal product research and development and
technology development.

   Selling, General and Administrative Expenses

   Our selling, general and administrative expenses increased $2.9 million to
$7.4 million for the year ended December 31, 1999 from $4.5 million for the
year ended December 31, 1998. This increase was primarily attributable to
expenses related to separation agreements with former employees and
amortization of deferred compensation, as discussed in the paragraph below. We
expect that our selling, general and administrative expenses will increase to
support our growth and requirements as a public company.

   Other Income (Expense)

   Other income (expense) primarily consists of interest income and interest
expense. Interest income was relatively level at $0.5 million for the year
ended December 31, 1999 as compared to $0.6 for the year ended December 31,
1998. Interest expense increased $0.1 million to $0.4 million for the year
ended December 31, 1999 from $0.3 million for the year ended December 31, 1998.
This increase was primarily attributable to expanded equipment lease financing.

   Provision for Income Taxes

   We incurred net operating losses for the year ended December 31, 1999 and
1998, and accordingly, we did not pay any federal or state income taxes. As of
December 31, 1999, we had federal net operating loss carryforwards of
approximately $45.8 million, which begin to expire in 2009. The net operating
loss carryforwards for state tax purposes were approximately $28.9 million,
which began to expire in 1999. We also had federal research and development tax
credit carryforwards of approximately $1.2 million, which begin to expire in
2009. Our utilization of the net operating losses and credits may be subject to
substantial annual limitations pursuant to Section 382 of the Internal Revenue
Code, and similar state provisions, as a result of changes in our ownership
structure. The annual limitations may result in the expiration of net operating
losses and credits prior to utilization.

   Deferred Compensation and Other Non-Cash Compensation Charges

   Deferred compensation for options granted to employees has been determined
as the difference between the exercise price and the fair value of our common
stock, as estimated by us for financial reporting purposes, on the date options
were granted. Deferred compensation for options granted to consultants has been
determined in accordance with Statement of Financial Accounting Standards No.
123 as the fair value of the equity instruments issued, and is periodically
remeasured as the underlying options vest in accordance with EITF 96-18.

   In connection with the grant of stock options to employees, we recorded
deferred compensation of approximately $6.8 million in the year ended December
31, 1999. This amount was recorded as a component of stockholders' equity and
is being amortized as a charge to operations over the vesting period of the
options. We recorded amortization of deferred compensation of approximately
$3.0 million for the year ended December 31, 1999. Included in research and
development and selling, general and administrative expenses are $0.9 million
and $2.1 million, respectively, of amortization expense.

   We recorded non-cash compensation charges of $1.1 million in 1999 in
conjunction with the acceleration of vesting for stock options of terminated
employees. We calculated the charge as the difference between the exercise
price of the stock options and the fair value of our common stock estimated for
financial reporting purposes on the date of the modification of the option
grants.

                                       21
<PAGE>


   We will record additional non-cash compensation charges totaling $5.8
million in the first quarter of 2000. These charges result from the
acceleration of vesting for unvested stock options in February 2000, of which
$1.7 million resulted from accelerated options held by a board member, and $4.1
million related to accelerated options held by employees. These actions are
described in more detail in "Certain Transactions."

Years Ended December 31, 1998 and 1997

   Revenue

   Our revenue increased to $1.3 million in 1998 from $1.2 million in 1997.
This increase was primarily attributable to the addition of new government
grants. Revenue from collaborations accounted for 46% of total revenue for 1998
and 58% of total revenue for 1997.

   Research and Development Expenses

   Our research and development expenses increased $2.5 million, or 30%, to
$10.7 million for 1998 from $8.2 million for 1997. This increase was primarily
attributable to expanded technology development and internal product
development.

   Selling, General and Administrative Expenses

   Our selling, general and administrative expenses decreased $0.8 million to
$4.5 million for 1998 from $5.3 million for 1997. This decrease was primarily
attributable to lower staffing and related costs and reduced product
advertising and promotions. In addition, 1997 expenses include costs associated
with relocating our facilities from Pennsylvania to California.

   Other Income (Expense)

   Interest income increased $0.3 million to $0.6 million for 1998 from $0.3
million for 1997. This increase was attributable primarily to higher average
cash balances during 1998. Interest expense was level at $0.3 million year over
year.

   Provision for Income Taxes

   We incurred net operating losses for 1998 and 1997, and accordingly, we did
not pay any federal or state income taxes.

   Deferred Compensation

   In connection with the grant of stock options to employees, we recorded
deferred compensation of approximately $1.9 million in the year ended December
31, 1998. This amount was recorded as a component of stockholders' equity and
is being amortized as a charge to operations over the vesting period of the
options. We recorded amortization of deferred compensation of approximately
$1.7 million for the year ended December 31, 1998. Included in research and
development and selling, general and administrative expenses are $0.5 million
and $1.2 million, respectively, of amortization expense.

LIQUIDITY AND CAPITAL RESOURCES

   Since inception, we have financed our business primarily through private
placements of preferred stock with net proceeds of $55.7 million, and funding
from strategic partners and government grants. As of December 31, 1999, we had
cash, cash equivalents and short-term investments of approximately $5.1
million. We expect to receive an additional $15.0 million in January 2000 from
Novartis Seeds AG as an initial payment under a strategic alliance agreement
signed in December 1999. Our funds are currently invested in U.S. Treasury and
government agency obligations and investment-grade corporate obligations.

                                       22
<PAGE>


   As part of our plan to lease new executive offices and research and
development facilities in 2000, we plan to construct a pilot manufacturing
facility, which will be used for process development activities. Our costs for
fixed assets relating to the pilot manufacturing facility will be approximately
$2.4 million, all of which we anticipate financing through equipment leases. As
of December 31, 1999, we had no purchase commitments relating to the pilot
facility. Additionally, we expect to fund $1.0 million in enhancements to our
SciLect project in 2000, which will be funded through working capital.

   Our operating activities used cash of $4.0 million in the year ended
December 31, 1999, $10.8 million in the year ended December 31, 1998, and $11.2
million in 1997. Our use of cash for all periods primarily resulted from our
losses from operations and the changes in our working capital accounts.

   Our investing activities used cash of $5.4 million in 1999, $1.9 million in
1998 and $0.7 million in 1997. Our investing activities consist primarily of
purchases of property and equipment, purchases of investment securities,
purchase of technology rights and increases in long-term deferred assets.

   Our financing activities provided $7.5 million for the year ended December
31, 1999 and provided cash of $0.6 million in 1998 and $23.5 million in 1997.
Our financing activities have consisted primarily of the sale of preferred
stock to both private investors and strategic partners, and proceeds received
and payments made under our capital lease lines and notes payable.

   We expect that the proceeds from this offering, combined with our current
cash and cash equivalents, short-term investments, and funding from existing
strategic alliances and grants including committed minimum funding totaling
$68.0 million from our collaborators to be received between 2000 and 2004 will
be sufficient to fund our operations for at least the next two years. This
estimate is a forward-looking statement that involves risks and uncertainties
as set forth under the caption "Risk Factors" in this prospectus. Our future
capital requirements and the adequacy of our available funds will depend on
many factors, including scientific progress in our research and development
programs, the magnitude of those programs, our ability to establish strategic
alliance relationships, and competing technological and market developments.
Therefore, it is possible that we may seek additional financing within this
timeframe. If we require additional capital to fund our operations and such
financing is not available, we may need to cease operations. Alternatively, we
may need to enter into financing arrangements which could dilute some
stockholders' ownership interests and adversely affect their rights.

YEAR 2000

   The year 2000 problem potentially affects the computers, software and other
equipment that we use, operate or maintain in our operations. As a result, we
have formalized our year 2000 compliance plan to be implemented by a team of
employees, led by our internal information technology staff, responsible for
monitoring the assessment and remediation status of our year 2000 projects. We
have been working on this year 2000 compliance plan for the past six months.

   Information Technology Systems. As part of our compliance plan, we made an
assessment of the year 2000 readiness of our core information technology
systems, including our servers, databases, internally developed software,
desktop computers and significant microprocessor-controlled equipment. The
majority of our computer systems and software are less than 26 months old. Our
business system was put into use in 1998 and has been certified year 2000
compliant. We have completed our assessment of the year 2000 readiness of our
core information technology systems. Through this process, we contacted key
external suppliers of software applications and computer systems to coordinate
the evaluation of potential year 2000 issues. We completed minor remediation
with regard to software programs, hardware and microprocessor-controlled
equipment. When appropriate, we coordinated our remediation efforts with our
third party suppliers.

   Systems Other than Information Technology Systems. In addition to computers
and related systems, the operation of office and facilities equipment, such as
fax machines, telephone switches, security systems and other common devices may
be affected by the year 2000 problem.

                                       23
<PAGE>

   Costs of Remediation. We have spent less than $50,000 to date for
remediation and expect to incur minimal additional costs related to any
required modifications, upgrades or replacements of our internal systems.

   To date, we have not experienced any material adverse effect on our business
or operating results as a result of any year 2000 problems. In addition, we
have not deferred any material information technology projects or equipment
purchases, as a result of our year 2000 problem activities.

   Most Likely Consequences of Year 2000 Problems. We believe we have
identified and resolved all year 2000 problems that could materially adversely
affect our business operations. However, we believe that it is not possible to
determine with complete certainty that all year 2000 problems affecting us have
been identified or corrected. The number of devices and systems that could be
affected and the interactions among these devices and systems are too numerous
to address. In addition, no one can accurately predict which year 2000 problem-
related failures will occur or the severity, timing, duration, or financial
consequences of these potential failures. As a result, we believe that the
following consequences are possible:

  .  Operational inconveniences and inefficiencies for us and our strategic
     partners that will divert management's time and attention and financial
     and human resources from ordinary business activities;

  .  Business disputes alleging that we failed to comply with the terms of
     contracts or industry standards of performance, some of which could
     result in litigation or contract termination; and

  .  Loss of revenue as a result of network, software or hardware failures.

   We also could be materially adversely affected if third parties upon whom we
depend in order to run our day-to-day business experience year 2000 problems.

   Contingency Plans. We do not anticipate needing to develop contingency plans
to be implemented if our efforts to identify and correct year 2000 problems
affecting our internal systems are not effective. If the need arises, we will
rapidly develop contingency plans that may include:

  .  Accelerated replacement of affected equipment or software;

  .  Short to medium-term use of backup equipment and software or other
     redundant systems;

  .  Increased work hours for our personnel or the hiring of additional
     information technology staff; and

  .  The use of contract personnel to correct, on an accelerated basis, any
     year 2000 problems that arise or to provide interim alternate solutions
     for information system deficiencies.

   Our implementation of any of these contingency plans could harm our
business.

   Disclaimer. The discussion of our efforts and expectations relating to year
2000 compliance contains forward-looking statements. Our ability to achieve
year 2000 compliance, and the level of incremental costs associated with our
compliance, could be adversely affected by, among other things, the
availability and cost of contract personnel and external resources, third-party
suppliers' ability to modify proprietary software and unanticipated problems
not identified in the ongoing compliance review.

RECENTLY ISSUED ACCOUNTING STANDARDS

   In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Financial
Instruments and for Hedging Activities," which will be effective for our fiscal
year 2001. This statement establishes accounting and reporting standards
requiring that every derivative instrument, including derivative instruments
embedded in other contracts, be recorded in the balance sheet as either an
asset or liability measured at its fair value. The statement also requires that
changes in the derivative's fair value be recognized in earnings unless
specific hedge accounting criteria are met. SFAS 133 is not anticipated to have
a significant impact on our operating results or financial condition when
adopted, since we currently do not engage in hedging activities.

                                       24
<PAGE>

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

   Our exposure to market risk for changes in interest rates relates primarily
to the increase or decrease in the amount of interest income we can earn on our
investment portfolio and on the increase or decrease in the amount of interest
expense we must pay with respect to our various outstanding debt instruments.
Our risk associated with fluctuating interest expense is limited, however, to
our capital lease obligations, the interest rates under which are closely tied
to market rates, and our investments in interest rate sensitive financial
instruments. Under our current policies, we do not use interest rate derivative
instruments to manage exposure to interest rate changes. We ensure the safety
and preservation of our invested principal funds by limiting default risks,
market risk and reinvestment risk. We mitigate default risk by investing in
investment grade securities. A hypothetical 100 basis point adverse move in
interest rates along the entire interest rate yield curve would not materially
affect the fair value of our interest sensitive financial instruments at
December 31, 1998 or December 31, 1999. Declines in interest rates over time
will, however, reduce our interest income while increases in interest rates
over time will increase our interest expense.

                                       25
<PAGE>

                                    BUSINESS

   We believe that we are a global leader in discovering and developing novel
enzymes and other biologically active compounds, together known as
biomolecules, from diverse environmental sources for use in agricultural,
chemical processing, industrial and pharmaceutical applications. We apply our
fully-integrated and proprietary processes to obtain previously unaccessed
genetic material from uncultured organisms found in various natural
environments, catalog and store genes in gene libraries, screen these libraries
using methods capable of analyzing more than a billion genes per day, optimize
selected enzymes and compounds by applying our proprietary DirectEvolution(R)
genetic modification technologies, including Gene Site Saturation
Mutagenesis(TM) and GeneReassembly(TM), and we develop novel host organisms for
the manufacture of resulting products. We have entered into a number of
strategic alliances with market leaders across multiple industries, including:
Novartis Seeds AG, Novartis Agribusiness Biotechnology Research, Inc., The Dow
Chemical Company, Rhone-Poulenc Animal Nutrition S.A. and Finnfeeds
International Limited.

INDUSTRY BACKGROUND

Introduction

   Microbes, such as bacteria and fungi, are the world's most abundant and
varied organisms and can be found in almost every ecosystem, including oceans,
deserts, rain forests and arctic regions. Through generations of natural
selection in diverse environments, microbes have developed characteristics that
are broader and more varied than those encountered in plants or animals. These
characteristics, which include the ability to survive in extreme temperature,
tolerate high or low pH and high or low salt environments, are the result of
the highly diverse genetic material found in the microbial world. This genetic
material, commonly known as DNA, is a fundamental molecule found in the cells
of all living organisms and is composed of four different chemical bases called
nucleotides. Nucleotides are arranged into units called genes, which are the
elements of heredity. Each gene carries the instructions for the production of
a protein. One key class of proteins, known as enzymes, carries out the
chemical reactions that give each microbe its unique character. Countless
microbes, each with their unique enzymes, influence our lives in a multitude of
ways. For example, some microbes make the soil fertile, clean up the
environment and supply the atmosphere with oxygen, while others are used to
produce vitamins and drugs, or improve our food.

Commercial Applications

   Virtually any product or process that utilizes or could utilize proteins can
potentially be improved using novel, naturally occurring biomolecules.
Consequently, naturally occurring biomolecules are commercially applicable to a
broad range of multi-billion dollar industries. For example, enzymes isolated
from microorganisms have been used in home laundry detergents and for the
production of cheese and sweeteners. While most enzyme applications were
developed prior to the era of biotechnology, new commercial applications have
been limited in the 1990's primarily because of the lack of new varieties of
enzymes. Additionally, a significant portion of the enzymes being used
commercially are not optimal for their intended uses.

Traditional Approaches and Their Limitations

   Traditional methods of discovering enzymes and other biologically active
molecules do not utilize a DNA-based approach, but are accomplished by
screening extracts of plants or culturing microorganisms for the activity of
interest. Once an activity is identified, purification is performed and the
relevant molecule is isolated. With respect to biologically active molecules,
this process is followed by the difficult and time consuming task of
determining the chemical structure of the molecule, which requires producing
sufficient quantities of the molecule by culturing a sample in the laboratory.
To date, modern biochemical science has characterized greater than 3,000
enzymes. Nearly all of such enzymes have been identified from organisms that
have been successfully cultured in the laboratory. Therefore, enzymes from only
a small fraction of the billions

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<PAGE>

of different species of microorganisms living throughout the world have been
characterized. The reasons for this include:

  .  Less than an estimated 1% of the microorganisms in most habitats will
     grow using standard laboratory techniques because it is so difficult to
     precisely create the required environmental conditions;

  .  If an extract from a plant or cultured organism is not collected at the
     appropriate time, the activity of interest may not be present, since
     enzymes and other bioactive molecules may only be synthesized at
     specific times during a cell cycle or under specific conditions; and

  .  Even if the enzyme or bioactive molecule is isolated, the targeted
     recovery of the corresponding gene or genes encoding these molecules is
     usually difficult.

Accordingly, the universe of potentially useful compounds from biodiversity
remains largely untapped.

   Once an enzyme of interest is discovered, its genetic sequence can be
studied and genetic variation may be introduced in an attempt to modify its
function through this process of evolution. Genetic variation is generated
predominantly by two methods: mutation and recombination. Mutation is the
introduction of changes into a gene. Mutation can be achieved by several
methods, including forcing the DNA to replicate in a manner which intentionally
causes random changes. Mutation is typically achieved by randomly introducing
single DNA base mutations into a gene in an attempt to alter a single amino
acid within the corresponding protein. Each of these methods has deficiencies
that make it virtually impossible to generate all 19 possible amino acid
changes at each position within the protein. To generate all amino acid changes
at each site would require multiple, appropriately positioned DNA base changes.
In actual practice, fewer than six changes, on average, are explored due to
deficiencies in mutation and sampling methods. Recombination, the other method
for producing genetic variation, is the mixing of two or more related genes to
form hybrids. However, the generation of improved variants has, to date, been
inefficient and laborious, or has allowed only closely related genes to be
recombined.

   Regardless of the method used to generate the variation, mutation or
recombination, the improved molecules must be selected from numerous unimproved
or defective versions. This selection process requires the ability to quickly
screen large numbers of genes to distinguish the improved versions.

   Once a desired gene is found and optimized, commercial production requires
insertion of the gene into a production system or host. Almost all of the
current commercial enzymes used in industrial applications today were derived
from cultured microorganisms and produced in these or similar organisms.
However, genes encoding unique biomolecules may not be able to be expressed and
commercially produced in traditional systems. Thus, traditional methods present
both the problem of novel biomolecule identification and the challenge of
commercial production of any identified biomolecules.

DIVERSA'S SOLUTION AND ADVANTAGES

   Our proprietary technologies and tools address the limitations of
traditional approaches for the recovery and modification of novel genes and
linked genes comprising novel gene pathways and the manufacture and
commercialization of related products. Our fully-integrated process includes
the following steps:

  .  We collect small environmental samples containing heterogeneous
     populations of uncultured microbes from diverse ecosystems and extract
     the genetic material from these organisms, eliminating the need to grow
     and maintain the organisms in cultures in the laboratory. Since small
     samples yield sufficient DNA, we minimize our impact on sensitive
     environments.

  .  We create gene expression libraries, DiverseLibraries(TM), from the DNA
     extracted from the organisms found in the specified environment, and
     PathwayLibraries(TM), libraries of multi-gene pathways responsible for
     the production of small molecules. We estimate that our gene expression
     libraries

                                       27
<PAGE>

     currently contain the complete genomes of over 1 million unique
     microorganisms, comprising a vast resource of genetic material that can
     be screened for valuable commercial products.

  .  We employ proprietary methods for quickly and cost-effectively screening
     large numbers of novel genes and their variants. Our proprietary
     screening techniques efficiently address the tremendous volume of
     genetic material captured in our libraries and significantly accelerate
     the product development process. Our data management and analysis
     system, SciLect(TM), allows us to store and manipulate the vast amount
     of information generated from our screening activities.

  .  We utilize our proprietary DirectEvolution technologies, including Gene
     Site Saturation Mutagenesis and GeneReassemby, to enable a full range of
     accelerated DNA mutations. This greatly enhances the efficiency of the
     evolution process, and reduces the laborious nature of current mutation
     and recombination processes.

  .  We insert a selected gene or pathway into novel hosts for biomolecule
     production for the manufacture of resulting products, facilitating
     better gene expression and thereby improving the efficiency of
     traditional production processes.

            Innovation From Biodiversity And Gene Evolution Process
[Diagram titled Diversa: Innovation from BioDiversity Process]

   We believe the integration of these capabilities enables us to maintain our
leadership in developing and commercializing novel products to address the
needs of our target markets. The genetic diversity of our expansive gene
libraries and our proprietary high-throughput screening and evolution
technologies allow us to shorten the development cycles for novel enzymes and
biologically active compounds. Additionally, our processes are designed to help
our customers improve their manufacturing processes, reduce costs, reduce
waste, improve yield and improve the quality of their end products.

                                       28
<PAGE>

MARKET OPPORTUNITIES

   We are developing products for a number of multi-billion dollar markets,
including agricultural, chemical processing, industrial and pharmaceutical
applications. Our target markets provide both short-term and long-term product
revenue opportunities, with chemical and industrial products having relatively
short development and regulatory approval processes, agricultural products
having intermediate term development and regulatory approval processes, and
pharmaceutical products having longer development and regulatory approval
processes.

   Within these broad markets we are targeting key segments where we believe
our technologies and products will create high value and competitive advantages
for our strategic partners and our customers. We have been able to identify and
produce enzymes that exhibit dramatic increases in efficiency and stability
applicable to strategic partners' and customers' unique requirements, such as
high or low temperature stability, high or low pH tolerance, high or low salt
tolerance, or combinations of these features.

Agricultural Products

   The growth of the agricultural market has been spurred by the world's
population growth. This growth has led to the demand for new technology that
improves productivity, reduces environmental impact and improves quality,
safety and nutritional value of agricultural products. Animal feed crops, such
as corn, wheat, barley, rye, oats and soybean, can be improved through the
selective development of value-added traits. We estimate that the animal feed
market is currently $36 billion in annual revenue. Additionally, in 1997 $5.9
billion was spent on animal feed additives for the purpose of improving feed
digestibility and increasing nutritional value.

   Genetically engineered crops with improved traits are expected to contribute
substantially more value to the existing $15 billion agriculture seeds market.
In addition, consumer and regulatory demands for alternative pest management
solutions will fuel growth in the agrochemical market, estimated at $33 billion
in 1998.

   In agriculture, we are developing a variety of specialty enzymes, engineered
genes and small molecules for use in the following applications:

  .  Crop Protection. We have developed enzymes that will be used as
     biological catalysts to produce building blocks for agricultural
     chemicals and active ingredients in herbicides and insecticides. We are
     also developing genes to be inserted into crops to provide them with
     insect resistance and herbicide tolerance. In addition, we are
     developing small molecules with anti-fungal properties. These products
     are designed to increase crop yield and reduce the environmental impact
     of crop protection techniques.

  .  Animal Feed Additives. Animal feed additives are designed to increase
     digestibility of essential vitamins and minerals, increase nutritional
     value and animal product yield and reduce harmful materials in waste. We
     are developing several classes of enzymes, including phytases,
     carbohydrases and proteases, for the increased absorption of organic
     phosphorous and digestibility of carbohydrates, as well as the promotion
     of weight gain in livestock. We are also developing genes to impart
     these same qualities into genetically engineered crops.

  .  Agricultural Product Processing. We have developed genes for improving
     grain processing, nutrition and specialty foods. These applications
     include starch and oil modification and breakdown of non-starch
     polysaccharides to increase nutritional and food value.

  .  Animal Health. In addition to the above applications, we intend to
     develop vaccines and therapeutics to treat and prevent diseases of farm
     animals.

Chemical Processing

   Annual revenue for the chemical industry currently exceeds $800 billion. Our
focus is on both fine chemicals, such as chiral chemicals used as building
blocks for pharmaceuticals, and high-performance

                                       29
<PAGE>

chemicals. The current market for fine chemical intermediates is approximately
$45 billion, of which an estimated $25 billion relates to building blocks
useful for the manufacture of chiral and other drugs.

   In chemical processing, we are developing a variety of specialty enzymes for
use in the following applications:

  .  Building Blocks for Production of Chiral Pharmaceuticals. We are
     developing enzymes for the production of desired, active and essential
     elements for the manufacture of chiral drugs, including many of the
     leading revenue generating drugs currently on the market. We believe
     these enzymes may also reduce production costs and waste associated with
     manufacturing these compounds.

  .  High Performance Specialty Chemicals and Polymers. We are developing
     enzymes that act as biological catalysts in the production of specialty
     chemicals and polymers such as amino acids, anti-oxidants, vitamins and
     pigments. These enzymes are intended to reduce manufacturing costs both
     by reducing the amount and number of steps necessary to produce these
     specialty chemicals and polymers and by reducing the production of
     unwanted byproducts from these production processes.

Industrial Enzymes

   Industrial enzymes represents a growing market, estimated at $1.8 billion in
revenue in 1998. We believe there are a number of applications within this
market that could provide us with commercial opportunities. We are currently
developing a variety of specialty enzymes for use in the following
applications:

  .  Oil and Gas Well Breakers. We have developed thermostable enzyme
     breakers that improve viscosity control and are designed for use in deep
     and high temperature wells. These enzyme breakers allow for improved
     extraction of oil and gas from existing wells, resulting in greater
     production and increased revenue per well.

  .  Detergents. We are developing more effective enzymes for solving
     currently unmet needs in fabric care, dishwashing and industrial
     cleaning. These specialty enzymes are intended to improve removal of
     oil, protein, starch and other difficult-to-remove stains, as well as
     maintain the original condition of washed fabrics.

  .  Corn Wet Milling. Corn wet milling enzymes are used to modify the starch
     found in corn to produce higher value end products, such as high
     fructose corn syrup and ethanol. We are developing new enzymes that we
     believe will significantly reduce the costs and energy requirements for
     this process, by eliminating the need for particular process adjustments
     and the waste that results from these processes.

  .  Textile Manufacturing. We have developed, and are continuing to develop,
     enzymes that assist in the removal of starch from textiles in
     manufacturing and also impart desired appearance qualities to the
     finished fabric. These enzymes are designed to reduce the manufacturing
     cost and waste associated with the use of harsh chemicals currently used
     in this process.

  .  Pulp and Paper Processing. We intend to develop enzymes to aid in pre-
     bleaching pulp, which reduces the need to use strong oxidizer chemicals,
     such as chlorine and sulfite, in that process. The enzymes we develop
     could reduce the cost of pulp processing both by reducing the amount of
     oxidizer chemicals required and the expense associated with treating the
     waste resulting from the use of these harsh chemicals.

  .  Production of Modified Oils. We intend to develop enzymes to create
     custom products, such as margarines, cooking oils and lubricants,
     through the modification of fats and oils. Our enzymes will be directed
     to improving product qualities, such as reducing the cholesterol causing
     components in margarine and cooking oils and improving the heat
     stability of lubricants.


                                       30
<PAGE>

Pharmaceutical Products

   According to an industry source, the worldwide pharmaceutical market was
$300 billion in 1998 and is expected to grow to $415 billion by 2002. Our
earlier-stage pharmaceutical program seeks to apply our technologies to the
discovery and development of compounds for selected applications within this
market. We believe that the initial applications for our technologies will lead
to strategic partnerships that include:

  .  Discovery of Small Molecule Compounds. Using our ultra high-throughput
     screening methods, we are working to discover small molecule compounds
     as candidates for anti-microbials, anti-fungals, anti-virals and other
     therapeutic drugs. We believe that our recombinant product methodologies
     can yield results superior to other approaches because natural pathways
     can yield more complex chemical structures compared to lab-based
     synthesis. In addition, naturally-derived molecules have been pre-
     selected in the environment to perform specific biological functions.
     Finally, our recombinant small molecule discovery approach permits
     higher throughput discovery.

  .  Improving Protein Therapeutics, Vaccines and Gene Therapy Products. We
     intend to apply our technologies to the improvement of protein
     therapeutics, vaccines and gene therapy products. Our DirectEvolution
     technologies can be utilized on environmental and human proteins to
     generate human therapeutics with enhanced activity, reduced side effects
     and extended patent life.

OUR STRATEGY

   Our goal is to be the leading provider of novel enzymes and biologically
active compounds for use in agricultural, chemical processing, industrial and
pharmaceutical applications. The key elements of our strategy are to:

   Protect and enhance our technology leadership position. We are unique
relative to our competitors in that we have an end-to-end product solution
consisting of access to novel genetic material, assay technologies capable of
screening more than a billion genes per day, multiple evolution technologies
and manufacturing expertise. We have surrounded our technology with a
substantial portfolio of intellectual property, and we will continue to make
investments in developing and protecting these assets.

   Expand our existing DNA libraries through access to novel genetic material
and utilize our proprietary technologies to discover new genes and pathways to
provide solutions to market needs. We believe our ability to create expanded
libraries using minute samples of genetic material collected from diverse
environments is an important factor to our success. Our need to use only small
environmental samples results in minimal impact to the surrounding ecosystem,
enabling us to enter into formal genetic resource access agreements. To date,
we have obtained samples under these agreements with Costa Rica, Bermuda,
Indonesia, Yellowstone National Park, Mexico and Iceland. We intend to enter
into additional agreements to further strengthen our biodiversity access
program by expanding both the countries and the types of ecosystems from which
we obtain samples. We have also collected samples from private lands in the
United States and in areas that do not require formal access agreements, such
as the deep sea. Using our proprietary techniques to recover the genes from
these samples, we have constructed our DiverseLibraries. We intend to expand
these DiverseLibraries, which we estimate currently contain the total genomes
of over 1 million unique microorganisms. We are also making a significant
effort to expand our collection of multi-gene pathways, our PathwayLibraries.
We believe that the application of our proprietary technologies to this vast
resource of genetic material will provide us with a myriad of product
candidates for attractive commercial applications.

   Deploy our technologies across diverse markets in order to maximize our
return on investment. We are focusing on commercial solutions for a broad range
of applications for the agricultural, chemical, industrial processing and
pharmaceutical industries. Products and processes utilizing genes, proteins,
small molecules, pathways and bioactive molecules are all potential targets.
Discoveries or developments made for any particular market may find use in
other applications, resulting in enhanced revenues, more efficient use of
corporate resources and increased return on investments.


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<PAGE>

   Pursue additional strategic alliances with market leaders to access funding
and industry-specific expertise and to more efficiently develop and
commercialize a larger product portfolio. We will continue to enter into
strategic alliances with leading corporations in our target markets. The key
components of the commercial terms of such arrangements typically include some
combination of the following types of fees: exclusivity fees, technology access
fees, technology development fees, research support payments, milestone
payments, license or commercialization fees and royalties or profit sharing
income from the commercialization of products resulting from the strategic
alliances. These partners represent market leaders across multiple industries,
and include Novartis Seeds AG, Novartis Agribusiness Biotechnology Research,
Inc., The Dow Chemical Company, Rhone-Poulenc Animal Nutrition S.A. and
Finnfeeds International Limited.

   Independently develop and commercialize products in selected markets to
capture their full economic value. In addition to developing enzymes and
bioactive molecules through strategic alliances, we have developed and will
continue to develop products independently. For example, we successfully
introduced our first commercial product, Pyrolase 160, into the oil and gas
services market in 1999, and are currently developing Pyrolase 200, a second-
generation product with a higher range of temperature stability. We will
determine which products to pursue independently based on various criteria,
including: investment required, estimated time to market, regulatory hurdles,
infrastructure requirements and industry-specific expertise necessary for
successful commercialization. Because we will retain commercial rights to
independently developed products, we expect that these products will provide
attractive margins.

TECHNOLOGIES

DNA Sampling and Processing

   Our discovery program begins with access to biodiversity. Biodiversity can
be defined as the total variety of life on earth, including genes, species,
ecosystems and the complex interactions between them. We have obtained samples
from virtually all ecosystems represented on earth including such environments
as: geothermal and hydrothermal vents, acidic soils and boiling mud pots,
alkaline springs, marine and freshwater sediments, marine symbionts, manure
piles, contaminated industrial sites, arctic tundra, dry Antarctic valleys,
super cooled sea ice, microbial mats, bacterial communities associated with
insects and nematodes, fungi and plant endophytes. We also access genetic
material from public and private culture collections. Because we clone DNA
directly from environmental sources, we need to collect only minute samples of
genetic material, which results in minimal impact on the surrounding ecosystem.
As a result, we have been able to obtain broad access to biologically diverse
environments around the world.

Gene Library Generation

   To successfully capture the enormous genetic diversity present in uncultured
microbial community samples, we have developed a series of techniques, which
enable substantial recovery of DNA from a wide range of sample types, while
assuring DNA purity.

   Our methods for analysis of environmental samples give scientists a rapid
estimation of the total number of species present and the relative abundance of
each species within a sample. DNA recovered from complex environmental samples
often represents the genomes of thousands of different microbial species, some
of which are generally more abundant than others. We estimate that there may be
as much as a 100,000-fold difference in abundance between a dominant species
and a rare species in a single sample. To access the genetic material of rare
microbial species in a given sample, we have developed proprietary
normalization technologies that result in a more equal representation of each
species at the genetic level. Because current culturing techniques are
generally incapable of capturing this underrepresented genetic material, this
potentially valuable source of genetic information has historically not been
available to commercialize.

   DiverseLibrary Generation. We have developed proprietary methods for
construction of complex, representative environmental gene libraries. A gene
library is a stored collection of DNA fragments or genes.

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<PAGE>

We store these genes in library form by cloning or splicing the DNA fragments
into a vector, a piece of DNA that acts as a carrier or a transporter into a
host cell. The DNA fragment spliced into the vector DNA is called a
recombinant molecule or clone. A collection of clones representing the entire
DNA isolated from the organisms in the sample is a representative gene
library. In order to capture the complete genomic diversity present in these
complex microbial samples, which may contain more than 4,000 distinct genomes,
we prepare very large member libraries. The result is the creation of a
DiverseLibrary, which typically represents genomic coverage of these
microorganisms. We estimate that collectively our DiverseLibraries contain the
complete genomes of over 1 million different microorganisms, which far exceeds
the estimated 10,000 microorganisms which have been described in the
scientific literature.

   PathwayLibrary Generation. We are also developing PathwayLibraries,
collections of multi-gene pathways used in the discovery and production of
small molecules. While a single gene is responsible for the production of an
enzyme, the production of small molecules, such as antibiotics, typically
requires multiple genes working together in a coordinated fashion within a
genetic pathway. In addition, whereas the genetic blueprint for the production
of an enzyme is generally contained within approximately 1,000 nucleotides of
DNA, the blueprint for the production of an antibiotic pathway is typically
more than 25,000 nucleotides, and can be greater than 100,000 nucleotides. For
this reason, we are developing specific molecular tools that can accommodate
and stably maintain such large pieces of DNA in a library.

Screening and Enrichment

   We have developed an array of automated, ultra high-throughput screening
technologies and enrichment strategies. Our proprietary rapid screening
capabilities are designed to discover novel biomolecules by screening for
biological activity, known as expression-based screening, as well as by
identifying specific DNA sequences of interest, known as sequence-based
screening.

   We have developed several hundred assays capable of expression-based
screening from thousands to over 1 billion clones per day. Our key screening
technologies include SingleCell screening and high-throughput robotic-based
screening. Our ultra high-throughput SingleCell screening system uses
Flouresence Activated Cell Sorting, or FACS, a technology that enables the
identification of biological activity within a single cell. Our SingleCell
screens have been developed to identify clones based on activity or DNA
sequences. This system incorporates a laser with multiple wavelength
capabilities and the ability to screen up to 50,000 clones per second, or over
1 billion clones per day. The robotic screening system uses a high density
microtiter plate-based format, currently capable of screening and
characterizing up to 1 million clones per day.

   If the clone expresses an activity or contains a DNA sequence of interest,
it is isolated for further analysis.

   We have also developed rapid methods for sequence-based screening for
targeted genes directly from purified DNA. One of these methods, biopanning,
is a powerful alternative to traditional methods, especially when the gene is
toxic or unstable, or when the expression assay is laborious and time
consuming. Using our proprietary techniques, it is possible to screen 100
million clones per day for DNA sequences of interest.

   Because we conduct patented, activity-based screening, we are able to use
gene sequences with known function from our proprietary database to identify
the function of genes in public databases based on their sequences. These
newly identified sequences are then added to the repertoire of proprietary
sequences in our own database. As more microbial genomes are sequenced, our
ability to associate gene sequence with enzyme function will be enhanced. This
sequence database provides us with unique opportunities to find and patent
more sequences with similar function and the potential to modify these
sequences in order to create optimized catalysts and other biomolecules for
various commercial applications.

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<PAGE>

DirectEvolution

   The genetic code is structured such that a sequence of three nucleotides
defines an amino acid. Nature uses 20 common amino acids in proteins arranged
in a sequence, defining the protein structure and activity. Over the course of
evolution, nature has sampled countless sequence possibilities to evolve
enzymes to function optimally within the cell. However, when an enzyme is
removed from its natural cellular environment and used to perform reactions,
such as in a chemical process, its function may not be optimal. Laboratory
methods can accelerate the evolutionary process of optimization outside of the
cell by creating a large number of variants for screening. In the traditional
method for improving proteins, called site-directed mutation, a single site is
typically targeted for change based on prior knowledge of the protein
structure. Other traditional techniques, including random mutation, typically
produce single nucleotide changes which can only access a limited number of
alternative amino acids, typically fewer than 6 of the possible 19
alternatives. These methods are limited by their inability to produce all
sequence variations. Furthermore, the large number of resulting sequences
presents formidable screening challenges.

   We believe our techniques overcome the limitations of these traditional
methods, not only because of our superior screening capabilities, but also by
increasing the number and types of sequence variations we can create. Our
evolution technologies used to modify the DNA sequence of the genes,
DirectEvolution, include Gene Site Saturation Mutagenesis (GSSM) and
GeneReassembly. GSSM creates a family of related genes that all differ from a
parent gene by a single amino acid change at a defined position. By performing
GSSM on a gene encoding a protein, we create all possible single amino acid
substitutions within that protein, removing the need for prior knowledge about
the protein structure and allowing all possibilities to be tested in an
unbiased manner. The family of variant genes created using GSSM is then
available to be screened for proteins with improved qualities, such as
increased ability to work at high temperature, increased reaction rate,
resistance to deactivating chemicals or other properties important in a
chemical process. Individual changes in the gene that cause improvements can
then be combined to create a single highly improved version of the protein.

   In addition to altering single genes using the GSSM technique, we use our
proprietary GeneReassembly technologies for the reassembly of related genes
from two or more different species. Our GeneReassembly technologies recombine
multiple genes to create a large population of new gene variants. The new genes
created by GeneReassembly are then screened for one or more desired
characteristics. This evolutionary process can be repeated on reassembled genes
until new genes expressing the desired properties are identified.
GeneReassembly technologies can be used to evolve properties which are coded
for by single genes, multiple genes and entire genomes.

   As illustrated in the table below, we believe the combination of our GSSM
and GeneReassembly technologies addresses the broadest range of potential
optimization parameters for any enzyme:

<TABLE>
<CAPTION>
     CHARACTERISTICS FOR ENZYME OPTIMIZATION         OPTIMAL DIRECTEVOLUTION TECHNOLOGY
- ---------------------------------------------------------------------------------------
  <S>                                            <C>
  Stability                                                         GSSM
- ---------------------------------------------------------------------------------------
  Enhancement without inappropriate immune
   response                                                         GSSM
- ---------------------------------------------------------------------------------------
  Activity                                                   GeneReassembly/GSSM
- ---------------------------------------------------------------------------------------
  Expression                                                 GeneReassembly/GSSM
- ---------------------------------------------------------------------------------------
  Specificity                                                GeneReassembly/GSSM
</TABLE>

   We believe that the ability to selectively apply our GSSM or GeneReassembly
technologies to optimize enzymes provides us with a distinct competitive
advantage. GSSM is better suited in some situations, for example, in the
optimization of an enzyme's stability or its immune response characteristics.
With respect to stability, applying GSSM may significantly improve temperature
tolerance through combining single amino acid alterations at defined positions,
while maintaining the enzyme's overall characteristics, such as specificity. In
one situation, we have used this technology to improve enzyme stability by a
factor of 30,000. Similarly,

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<PAGE>

adverse immune system responses may be avoided by the incremental changes
created by GSSM. In contrast, random shuffling technologies, which cause
dramatic block shifts in DNA structure, are more likely to reduce stability and
create undesirable immune response characteristics. On the other hand, when
optimizing for activity, expression and specificity, both GSSM and
GeneReassembly can produce optimal results. Because we have multiple evolution
technologies combined with optimal natural enzymes to which we apply these
evolution methodologies, we believe that we are well-positioned to provide the
best solutions to our customers.

Our Data Management and Analysis System - SciLect

   We have developed and continue to enhance a leading edge, web-based
relational scientific database for internal purposes called SciLect. SciLect
provides a secure, reliable and accurate source for storage, retrieval and
analysis of vast amounts of proprietary biological data. Our SciLect system
includes custom-developed and third-party bioinformatics software tools which
assist in the acquisition and analysis of complex data relating to genes,
proteins, sequence similarity to known genes, three-dimensional structure
prediction and biological pathways. SciLect includes information relating to:

  .  Samples - detailed descriptions of each sample collected;

  .  DNA extractions - the results of separating or isolating DNA molecules
     directly from samples;

  .  Gene libraries - detailed descriptions of the genetic material in our
     DiverseLibraries and PathwayLibraries;

  .  Screening events - the results of assays from our high-throughput
     screening systems;

  .  Novel enzymes - specific properties or characteristics of each enzyme
     (e.g. optimal temperature, optimal pH, specific activity);

  .  Sequence data and analysis results - the output of raw DNA sequence data
     from our ultra high-throughput screening technologies and the analytical
     results from the application of our bioinformatics software tools;

  .  Clone data - descriptions of host organisms containing unique fragments
     of DNA or copies of DNA optimized for increasing DNA or enzyme yield;

  .  Optimization data - results from GSSM and GeneReassembly;

  .  Expression data - results from the process of optimizing protein
     production; and

  .  Patents - information on key data, genes and processes relating to our
     intellectual property portfolio.

   Utilizing the combination of SciLect and public databases, we are able to
first verify that we have a unique gene. We are then able to mine public
databases for previously unidentified proteins that can be added to our
portfolio of patented proteins. Publicly available databases of proteins and
genomic data are imported daily to our secure environment. Through the use of
SciLect, we have assembled a large proprietary database of patent-protected,
assembled and annotated unique gene sequences of over 1,000 novel enzymes.

Production - Host Cell Optimization

   Production of proteins and pathway products has historically been very
challenging due to the difficulty of producing commercial quantities of these
products in traditional host organisms. This problem can be overcome by finding
or developing a more suitable host organism. In the past, random mutation has
been used in an effort to create more efficient hosts. We believe our host cell
optimization processes will accelerate this effort. We are working on a number
of host organisms to improve their functionality as production hosts by:

  .  Sequencing the complete DNA of a host organism;

  .  Engineering defined changes in the host genome by, for instance, adding
     or removing genes that, when substituted, will improve production or
     permit the host to grow better under industrial conditions;


                                       35
<PAGE>

  .  Monitoring the effects of changes on the production of enzymes and
     pathway products and continuing to engineer changes; and

  .  Applying our screening technologies to rapidly characterize the effects
     of these changes.

PRODUCTS

   We have successfully commercialized our first product, Pyrolase 160, an
enzyme for oil and gas well fracturing operations. Sales of this product
commenced in January 1999, only two years after project initiation. We expect
to commercialize Pyrolase 200, a second generation oilfield enzyme product that
operates at a wider temperature range, in 2000. We believe our independent
development of Pyrolase 160 validates our technologies and illustrates our
ability to develop products rapidly using our proprietary methods.

   We intend to commercialize products both independently and in collaboration
with strategic partners. The following chart summarizes the stages of
development for the portfolio of projects we are pursuing. We anticipate that a
single project may lead to multiple commercial product candidates.

[DIAGRAM OF A PYRAMID WITH EIGHT LEVELS, EACH INDICATING A STAGE OF DEVELOPMENT
AND THE NUMBER OF PROGRAMS THAT HAVE PROGRESSED THROUGH THE SPECIFIED STAGE.]

   As of January 15, 2000, we had 43 projects in various stages of development
in our target markets. Of these, 8 had reached advanced stages of development,
of which one had been commercialized. An additional 15 projects had already
entered the product candidate stage with 20 more projects in various earlier
stages of development. We believe that each of these projects could lead to
multiple product solutions across multiple target markets.

CURRENT ALLIANCES AND OTHER AGREEMENTS

Current Alliances

   Our strategy includes pursuing strategic alliances with market leaders in
our target markets. In exchange for selected rights to future products, these
strategic alliances provide us funding and resources to develop and
commercialize a larger product portfolio. In various instances, these strategic
alliances allow us to leverage our partners' established brand recognition,
global market presence, established sales and distribution channels and other
industry-specific expertise. The key components of the commercial terms of such
arrangements typically include some combination of the following types of fees:
exclusivity fees, technology access fees, technology development fees, research
support payments, milestone payments, license or commercialization fees and
royalties or profit sharing from the commercialization of products. In addition
to $10.7 million received from inception through December 31, 1999, our
partners are committed to fund $68.0 million under existing agreements over the
next five years. Our partners have also purchased $9.2 million of our equity
securities.

                                       36
<PAGE>

   To date, we have entered into the following strategic alliances:

   Novartis

   In January 1999, we entered the agricultural biotechnology arena through a
strategic alliance with Novartis Agribusiness Biotechnology Research, Inc. This
alliance covers a multi-project collaborative research and development
agreement to develop products for crop enhancement and improved agronomic
performance. Under terms of the agreement, we are utilizing our unique
discovery and screening technologies to identify and optimize genes and gene
pathways for use in transgenic crops. The initial projects focus on new genomic
approaches that will provide improved performance and quality traits in crops
and enhance production. Under the agreement, Novartis receives an exclusive
option to receive a worldwide license to products developed. At Novartis'
election the license may be either exclusive or non-exclusive. In conjunction
with the transaction, Novartis purchased 5,555,556 shares of series E preferred
stock for gross proceeds of $7.3 million, paid a technology access fee of $3.0
million and provided project research funding of $2.2 million to us, for
aggregate total proceeds of $12.5 million. We are recognizing the research
payments and the technology access fee on a percentage of completion basis as
research is performed.

   In December 1999, we formed a five-year, renewable strategic alliance with
Novartis Seeds AG. Through a contract joint venture, we will jointly pursue
opportunities in the field of animal feed and agricultural product processing.
We will share in the management of the venture and fund a portion of the sales
and marketing costs of this venture. Under the agreements, Novartis receives
exclusive, worldwide rights in the field of animal feed and project exclusive,
worldwide rights in the field of agricultural product processing. Novartis will
pay us for the license granted under this agreement, of which $15.0 million
will be due within 30 days of regulatory approval and an additional $5.0
million due at the 18 month anniversary of this agreement. Additionally, we
will receive minimum research funding over five years of $33.9 million, as well
as milestone payments upon achievement of project objectives totaling up to
$7.7 million and license and commercialization fees for any resulting products.
We will receive a share of the profits in the form of royalties on any product
sales.

   Either party may terminate these agreements in the event a material breach
remains uncured for 90 days. Novartis may terminate these agreements within 60
days of a change of control of Diversa.

   The Dow Chemical Company

   In July 1997, we entered into an alliance with The Dow Chemical Company. The
alliance was for a project involving biocatalytic discovery and optimization
for use in new and existing Dow processes. This initial project was directed
towards the incorporation of a high performance enzyme into a modified chemical
process. Our staff successfully optimized an enzyme for this project with
significantly greater thermostability at a defined temperature, thereby meeting
milestones specified in the agreement.

   In July 1999, we entered into a new, three-year research agreement and a
license agreement with Dow. The new agreements significantly broaden the scope
of our original alliance. We are applying our discovery and optimization
technologies for Dow to develop a variety of novel enzymes for multiple
chemical processes on a reaction-exclusive basis. The research agreement
involves multiple projects in the field of chemical processing. The three-year
agreement requires Dow to make annual technology development payments of $1.5
million. Dow will also fund the research costs for the duration of the contract
totaling $10.8 million. We will also receive milestone payments of up to $2.7
million upon achievement of established objectives and license and
commercialization fees for any resulting products. We will also receive
royalties on sales of our royalty-bearing products sold or sublicensed by Dow.
We are amortizing the technology development fees over the minimum guaranteed
period of the agreement. In the license agreement, we grant Dow an exclusive,
worldwide, royalty-bearing license to use enzymes for research processes.
Either party may terminate the research agreement upon failure to pay amounts
due for 30 days or material breach if uncured within 60 days. The research
agreement may also be terminated by Dow with 180 days written notice or upon a
change of control to a Dow competitor

                                       37
<PAGE>

with 30 days notice, in both cases upon the payment of defined penalties. We
may terminate the license agreement in the event of a material breach if
uncured for 30 days. Dow may terminate the license agreement on 3 months
written notice.

   Rhone-Poulenc Animal Nutrition S.A.

   In June 1999, we entered into a six month collaboration agreement with
Rhone-Poulenc Animal Nutrition S.A., RPAN, under which we are using our gene
discovery and optimization technologies to develop novel enzymes which can be
used for biotransformation as an alternative to chemical synthesis. RPAN will
receive an option to obtain an exclusive, worldwide royalty-bearing license to
the targeted enzymes for a specified field. If RPAN does not exercise its
option, the agreement will expire. If RPAN exercises its option, the term of
this agreement will continue until the expiration of all patent rights covering
the licensed enzymes. RPAN supports research costs and will pay us a license
fee and a royalty based upon cost savings attributable to licensed enzymes.
This agreement may be terminated by either party upon material breach if
uncured within 30 days.

   Finnfeeds International Limited

   In May 1996, we formed an alliance with Finnfeeds International Limited. The
companies worked jointly to identify and develop a novel phytase enzyme that
when used as an additive in animal feed applications allows higher utilization
of phytic acid phosphates from the feed, thereby increasing its nutritional
value. The addition of phytase to animal feed reduces the need for inorganic
phosphorus supplementation and lowers the level of harmful phosphates that are
introduced to the environment through animal waste, resulting in inorganic
phosphate cost savings and a significant reduction in environmental pollution.
In conjunction with the agreement, we issued 844,444 shares of our series C
preferred stock to Finnfeeds for $1,900,000. We received and recognized as
revenue $0.8 million in research funding over the period from May 1996 through
December 31, 1998. We achieved all milestones under the agreement.

   Following the completion of the initial objectives of our alliance with
Finnfeeds, in December 1998, we entered into a license agreement with
Finnfeeds. Under this license agreement, we granted Finnfeeds an exclusive,
worldwide license to an enzyme and related technology for specified uses,
including manufacturing and sales of the enzyme. Finnfeeds has continuing
royalty obligations to us on product sales that incorporate the licensed
technology. Finnfeeds can terminate this agreement at any time upon six months
notice to us. We can terminate this agreement upon material breach by Finnfeeds
if uncured within 60 days.

License Agreements

   In addition to our strategic alliances, we have entered into various
agreements whereby we have in-licensed patented technologies to supplement our
internally developed methods, the most significant of which we have outlined
below. The financial impact of these agreements to us is not significant.

   Invitrogen Corporation

   In March 1999, we signed an agreement with Invitrogen Corporation for the
exchange of proprietary technologies and products in specified fields of use.
Under the terms of the agreement, we have an exclusive license to use
Invitrogen's TOPO Cloning technology in the field of cloning nucleic acids from
mixed populations and uncultured organisms. Invitrogen has an option to access
selected proprietary DNA modifying enzymes for use in the research reagent
marketplace. The TOPO Cloning technology broadens our portfolio of cloning
technologies. We paid Invitrogen a license fee and will pay an annual
maintenance fee in exchange for materials. Each party will have a royalty
obligation for the life of the patent rights on product sales that incorporate
the licensed technology. We can terminate this agreement with 90 days written
notice. Invitrogen

                                       38
<PAGE>

can terminate with 90 days written notice upon our failure to make any payment
or immediately upon our default if uncured within 90 days.

   Terragen Discovery, Inc.

   In November 1999, we signed a royalty-free cross-license agreement with
Terragen Discovery, Inc. granting non-exclusive, worldwide license rights for
the life of specified patents. We granted rights to our patents protecting
accessing genomes of uncultured organisms for the discovery of pathways
producing novel small molecules for pharmaceutical applications and Terragen
granted us co-exclusive rights to patents protecting generation and screening
of combinatorial libraries from mixed populations of organisms for all fields
of use. Under the agreement, we paid Terragen a $2.5 million license fee and
will pay annual maintenance fees for the remaining life of the patents. The
term of the licenses we granted to Terragen and that Terragen granted to us
will continue until the expiration of all valid claims within the licensed
patent rights. Either party may terminate this agreement in the event a
material breach remains uncured for 60 days. Both parties have rights to
terminate under special conditions.

   One Cell Systems, Inc.

   In December 1997, we entered into a research license agreement with One Cell
Systems, Inc. which provided us with non-exclusive access to One Cell's
proprietary encapsulation technologies for an initial term of twelve months.
This agreement was extended in February 1999. Under the terms of the agreement,
we receive equipment and reagents to use the proprietary technology in exchange
for annual payments. The extension to the agreement expires on December 31,
1999 but is renewable for a subsequent term at One Cell's option.

   Mycogen Corporation

   In December 1997, we signed a license agreement with Mycogen Corporation for
access to its proprietary expression system. Under the terms and conditions of
the agreement, we have an exclusive, worldwide license to use the system for
the production of enzymes in exchange for a license fee and royalties paid to
Mycogen. The agreement can be terminated by either party upon material breach
if uncured for 60 days.

Biodiversity Access Agreements

   We have obtained genetic material under formal genetic resource access
agreements with Costa Rica, Bermuda, Indonesia, Yellowstone National Park,
Mexico and Iceland. Pursuant to the terms of these agreements, we have obtained
non-exclusive access to collect samples from diverse ecosystems, we own the
samples collected and we pay a royalty to the other party on the sale of
products derived from the samples. All of these agreements expire in 2002 or
earlier, and they are all subject to earlier termination. Our access agreement
with Iceland was terminated, and we have voluntarily ceased collections of
further samples in Yellowstone National Park pending their resolution of
collection guidelines. If an access agreement terminates and a new agreement is
not established, we will not be permitted to collect any further materials from
the specified location; however, we will retain the right to use any samples we
have already collected. The financial impact of these agreements to us is not
significant.

COMPETITION

   We believe we are the leader in the field of biomolecule discovery and
optimization from biodiversity. We are not aware of another company that has
the scope and integration of technologies and processes that we have. There
are, however, a number of competitors who are competent in various steps
throughout our technology process. For example, Terragen Discovery, Inc. is
involved in accessing organisms from diverse environments. A number of
companies are performing high-throughput screening of molecules. Maxygen, Inc.
and Evotech have alternative evolution technologies. Integrated Genomics Inc.,
Myriad Genetics, Inc., ArQule, Inc. and Aurora Biosciences Corporation perform
screening, sequencing and/or bioinformatics services. Novo

                                       39
<PAGE>

Nordisk A/S and Genencor International Inc. are involved in development,
overexpression, fermentation and purification of enzymes. There are also a
number of academic institutions involved in various phases of our technology
process. Many of these competitors have significantly greater financial and
human resources than we do.

   We believe that the principal competitive factors in our market are access
to genetic material, technological experience and expertise and proprietary
position. We believe that we compete favorably with respect to the foregoing
factors.

   Any products that we develop will compete in multiple, highly competitive
markets. Many of our potential competitors in these markets have substantially
greater financial, technical and marketing resources than we do, and we cannot
assure you that they will not succeed in developing products that would render
our products or those of our strategic partners obsolete or noncompetitive. In
addition, many of these competitors have significantly greater experience than
we do in their respective fields. Our ability to compete successfully will
depend on our ability to develop proprietary products that reach the market in
a timely manner and are technologically superior to and/or are less expensive
than other products on the market. Current competitors or other companies may
develop technologies and products that are more effective than ours. Our
technologies and products may be rendered obsolete or uneconomical by
technological advances or entirely different approaches developed by one or
more of our competitors. The existing approaches of our competitors or new
approaches or technology developed by our competitors may be more effective
than those developed by us.

MANUFACTURING STRATEGY

   Our manufacturing strategy is to secure contract manufacturing relationships
with qualified third parties possessing sufficient industrial fermentation
capacity to meet our commercial production requirements. We plan to place our
own technical personnel on site at contract manufacturing facilities to plan
and supervise our production. Our employees have extensive experience in scale-
up and production of industrial fermentation products, including industrial
enzymes. We have cleared regulatory requirements for our first two commercial
enzymes, and are producing our first product at commercial scale. We
manufacture Pyrolase 160 pursuant to an arrangement with a third party that has
the required manufacturing equipment and available capacity to manufacture the
product under our direction and oversight. We also currently lease a pilot
facility for process development activities from a third-party, which we intend
to vacate by March 2000. We plan to construct our own pilot development
facility during 2000 and have identified alternative capacity to meet interim
requirements. In addition to requiring investment in equipment, construction of
this new facility will necessitate compliance with applicable regulations.
After we complete the construction of our pilot facility, we will continue to
depend on third parties for large-scale commercial manufacturing.

   We do not currently depend on any single supplier for the raw materials
necessary for the operation of our business. We may become dependent on a
single supplier in the future.

GOVERNMENT REGULATION

   Many of our product opportunities, and all of our projects to date, have
applications other than as regulated drug products. Non-drug biologically
derived products are regulated, in the United States, based on their
application, by either the FDA, the Environmental Protection Agency (EPA) or,
in the case of plants and animals, United States Department of Agriculture
(USDA). In addition to regulating drugs, the FDA also regulates food and food
additives, feed and feed additives, and GRAS (Generally Recognized As Safe)
substances used in the processing of food. The EPA regulates biologically
derived chemicals not within the FDA's jurisdiction. Although the food and
industrial regulatory process can vary significantly in time and expense from
application to application, the timelines generally are shorter in duration
than the drug regulatory process, ranging from six months to three years.

   The European regulatory process for these classes of biologically derived
products has undergone significant change in the recent past, as the EU
attempts to replace country by country regulatory procedures

                                       40
<PAGE>

with a consistent EU regulatory standard in each case. Some country-by-country
regulatory oversight remains. Other than Japan, most other regions of the world
generally accept either a United States or a European clearance together with
associated data and information for a new biologically derived product.

   In the United States, transgenic agricultural products may be reviewed, by
the FDA, EPA and USDA, depending on the plant and the trait engineered into it.
The regulatory process for these agricultural products can take up to five
years of field testing under USDA oversight, and up to another two years for
applicable agencies to complete their reviews.

   Outside of the United States, scientifically-based standards, guidelines and
recommendations pertinent to transgenic and other products intended for the
international marketplace are being developed by, among others, the
representatives of national governments within the jurisdiction of the
standard-setting bodies, including Codex Alimentarius, the International Plant
Protection Convention and the Office des International Epizooties. The use of
the existing standard-setting bodies to address concerns about products of
biotechnology is intended to harmonize risk-assessment methodologies and
evaluation of specific products or classes of products.

PROPRIETARY RIGHTS

   Our intellectual property consists of patents, copyrights, trade secrets,
know-how and trademarks. Protection of our intellectual property is a strategic
priority for our business. Our ability to compete effectively depends in large
part on our ability to obtain patents for our technologies and products,
maintain trade secrets and operate without infringing the rights of others and
to prevent others from infringing on our proprietary rights. As of January 15,
2000, we owned 24 issued patents relating to our technologies, had received
notices of allowance with respect to 7 other patent applications and have over
125 patents pending. In addition, as of January 15, 2000, we have in-licensed
more than 25 additional patents or patent applications that we believe
strengthen our patent position.

   The patent positions of biotechnology companies, including our patent
position, involve complex legal and factual questions and, therefore,
enforceability cannot be predicted with certainty. Patents, if issued, may be
challenged, invalidated or circumvented. We cannot be sure that relevant
patents have not been issued that could block our ability to obtain patents or
to operate as we would like to. Others may develop similar technologies or
duplicate technologies developed by us. We are aware of the existence of
patents in some countries that, if valid, may block our ability to
commercialize products in these countries if we are unsuccessful in
circumventing or acquiring the rights to these patents. We are also aware of
the existence of claims in published patent applications in some countries
that, if granted and valid, may also block our ability to commercialize
products in these countries if we are unable to circumvent or license them.

   The biotechnology industry is characterized by extensive litigation
regarding patents and other intellectual property rights. Many biotechnology
companies have employed intellectual property litigation as a way to gain a
competitive advantage. Third parties may sue us in the future to challenge our
patent rights or claim infringement of their patents. An adverse determination
in litigation or interference proceedings to which we may become a party could
subject us to significant liabilities to third parties, require us to license
disputed rights from third parties or require us to cease using the disputed
technology. We are aware of a significant number of patents and patent
applications relating to aspects of our technologies filed by, and issued to,
third parties. Should any of our competitors have filed patent applications or
obtain patents that claim inventions also claimed by us, we may have to
participate in an interference proceeding declared by the relevant patent
regulatory agency to determine priority of invention and, thus, the right to a
patent for these inventions in the U.S. Such a proceeding could result in
substantial cost to us even if the outcome is favorable. Even if successful on
priority grounds, an interference may result in loss of claims based on
patentability grounds raised in the interference. Although patent and
intellectual property disputes in the biotechnology area are often settled
through licensing or similar arrangements, costs associated with these
arrangements may be substantial and could include ongoing royalties.
Furthermore, we cannot be certain that the necessary licenses would be
available to us on satisfactory terms, if at all.

                                       41
<PAGE>

   We recently received a letter from a privately held biotechnology company
suggesting that we may want to consider licensing patents held by that third
party. We believe that we have defenses to any infringement claim with respect
to such patents. However, we cannot be certain that the third party will not
initiate litigation alleging that our technologies infringe claims of such
patent or that a court would not find such claims valid and infringed.

   We also rely on trade secrets, technical know-how and continuing invention
to develop and maintain our competitive position. We have taken security
measures to protect our trade secrets, proprietary know-how and technologies
and confidential data and continue to explore further methods of protection.
Our policy is to execute confidentiality agreements with our employees and
consultants upon the commencement of an employment or consulting arrangement
with us. These agreements generally require that all confidential information
developed or made known to the individual by us during the course of the
individual's relationship with us to be kept confidential and not disclosed to
third parties. These agreements also generally provide that inventions
conceived by the individual in the course of rendering services to us shall be
our exclusive property. There can be no assurance that proprietary information
will not be disclosed, that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
our trade secrets or that we can meaningfully protect our trade secrets.

EMPLOYEES

   As of December 31, 1999, we had approximately 102 full-time employees, 25 of
whom hold Ph.D. degrees. Of these employees, 77 were engaged in research and
development and 25 were engaged in business development, finance and general
administration. None of our employees are represented by labor unions or
covered by collective bargaining agreements. We have not experienced any work
stoppages and consider our employee relations to be good.

FACILITIES

   Our executive offices and research and development facilities are currently
located in San Diego, California. We lease approximately 24,900 square feet of
space. These facilities are leased through January 31, 2002. We are also
negotiating a sublease for approximately 3,000 square feet of adjacent
laboratory space for use through December 2000. To meet our expected growth
needs, we have selected two site alternatives in proximity to our current space
and are currently in lease negotiations for approximately 75,000 square feet of
space that will be built to our specifications. We plan to occupy the new space
in late 2000, at which time we plan to sublease our current space for the
remaining term. We will not have any equity interest related to the new
facility.

LEGAL PROCEEDINGS

   We are not presently a party to any material legal proceedings.

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<PAGE>

SCIENTIFIC ADVISORY BOARD

   We have established a select group of scientists to advise us on scientific
and technical matters in areas of the Company's business. The scientific
advisors are compensated with a $15,000 annual fee, payable quarterly. We have
also entered into consulting and other agreements with a number of our
scientific advisors under which they have received options to purchase shares
of our common stock.

   None of our scientific advisors is employed by us, and they may have other
commitments to, or consulting or advisory contracts with, their employers or
other entities that may conflict or compete with their obligations to us. Our
scientific advisors include:

<TABLE>
<CAPTION>
NAME                                      TITLE/AFFILIATION
- ----                                      -----------------
<S>                                       <C>
Melvin I. Simon, Ph.D.................... Chairman and Professor of Biology
                                          California Institute of Technology
Karl O. Stetter, Ph.D.................... Chairman and Professor of Microbiology
                                          University of Regensburg, Germany
Robert M. Kelly, Ph.D.................... Professor of Chemical Engineering
                                          North Carolina State University
George M. Whitesides, Ph.D............... Chairman and Professor of Chemistry
                                          Harvard University
</TABLE>

                                       43
<PAGE>

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

   The following table sets forth information about our directors and executive
officers as of January 15, 2000:

<TABLE>
<CAPTION>
                  NAME                    AGE                  POSITION
                  ----                    ---                  --------
<S>                                       <C> <C>
Jay M. Short, Ph.D. ....................  41  President, Chief Executive Officer and
                                              Chief Technology Officer, Director
William H. Baum.........................  54  Senior Vice President, Business Development
Karin Eastham...........................  50  Senior Vice President, Finance, Chief
                                              Financial Officer and Secretary
R. Patrick Simms........................  55  Senior Vice President, Operations
Carolyn A. Erickson.....................  35  Vice President, Intellectual Property
Daniel T. Carroll (1)...................  73  Director
James H. Cavanaugh, Ph.D. (1)...........  62  Director
Patricia M. Cloherty (1)................  57  Director
Peter Johnson (2).......................  54  Director
Donald D. Johnston (2)..................  74  Director
Mark Leschly (2)........................  31  Director
Melvin I. Simon, Ph.D. .................  62  Director
</TABLE>
- --------
(1) Member of human resources (compensation) committee.

(2) Member of audit committee.

   Dr. Jay M. Short was appointed our Chief Executive Officer in February 1999.
He has served as our Chief Technology Officer and as a director since September
1994 and also as our President since June 1998. Dr. Short served as President
of Stratacyte, Inc. and Vice President of Research & Development and Operations
for Stratagene Cloning Systems, both molecular biology companies based in La
Jolla, California. Dr. Short serves as a director for Invitrogen Corporation, a
gene expression company, and StressGen Biotechnologies Corp., a company engaged
in the medical application of stress proteins. Dr. Short received his Ph.D.
from Case Western Reserve University and his B.A. from Taylor University.

   Mr. William H. Baum joined us in August 1997 as Vice President, Sales and
Marketing, and was promoted to Senior Vice President, Business Development in
November 1999. Mr. Baum was Vice President of Global Sales and Marketing with
International Specialty Products, a specialty chemical company, from July 1993
to August 1997. Prior to joining International Specialty, Mr. Baum was with
Betz Laboratories, also a specialty chemical company, for 20 years in a variety
of international and domestic executive management positions including
Executive Vice President of European Operations and as Managing Director of
Germany. Mr. Baum received a B.S. from Widener University.

   Ms. Karin Eastham was appointed Senior Vice President, Finance, Chief
Financial Officer and Secretary in May 1999. Ms. Eastham served as Vice
President, Finance and Administration and Chief Financial Officer of CombiChem,
Inc., a computational chemistry company, from April 1997 to April 1999. From
October 1992 through April 1997, Ms. Eastham served as Vice President, Finance
and Administration and Chief Financial Officer of Cytel Corporation, a
biopharmaceutical company. Ms. Eastham also held several positions, including
Vice President, Finance, at Boehringer Mannheim Corporation, from June 1976 to
August 1988. Ms. Eastham received a B.S. and an M.B.A. from Indiana University.
She is a Certified Public Accountant.

   Mr. R. Patrick Simms has served as our Senior Vice President, Operations
since October 1998. He served as our Vice President, Process Engineering and
Manufacturing from February 1997 to October 1998. Mr. Simms served as Senior
Vice President, Business Development and Manufacturing, at Biosys, Inc., an

                                       44
<PAGE>

agricultural biotechnology company focusing on natural insecticide products,
from March 1990 to February 1997. Biosys filed for reorganization under Chapter
11 of the U.S. Bankruptcy Code in September 1996. Mr. Simms subsequently filed
for liquidation under Chapter 7 of the U.S. Bankruptcy Code in February 1997.
From December 1984 to March 1990, Mr. Simms served as Vice President,
Commercial Operations, at Genencor, a biotech company focusing on industrial
enzymes. Prior to joining Genencor, Mr. Simms spent 18 years with A.E. Staley
in a wide range of technical and operational positions. Mr. Simms received a
B.S. from West Virginia University .

   Ms. Carolyn A. Erickson has served as Vice President, Intellectual Property
since November 1999. From July 1994 to November 1999, Ms. Erickson held several
positions with us, including Director of Intellectual Property, Manager,
Business Development & Regulatory Affairs, Senior Patent & Licensing Liaison,
Patent & Licensing Liaison and Laboratory Administrator. Prior to joining us,
from April 1988 to June 1994 Ms. Erickson held several positions in Business
Development/Technology Transfer, Product Management, Marketing and Technical
Sales for Stratagene Cloning Systems. Ms. Erickson received a B.A. from the
University of California, San Diego.

   Dr. James H. Cavanaugh has been a director since December 1992 and our
Chairman since October 1998. Dr. Cavanaugh is President of HealthCare Ventures
LLC, a health care venture capital management company. Dr. Cavanaugh was
formerly President of SmithKline & French Laboratories--U.S., the
pharmaceutical division of SmithKline Beckman Corporation. Previously, he was
President of SmithKline Beckman's clinical laboratory business and, before
that, President of Allergan International. Prior to his industry experience,
Dr. Cavanaugh served as Staff Assistant to The President for Health Affairs and
then Deputy Director of the Domestic Council. Under President Ford, he was
appointed Deputy Assistant to the President for Domestic Affairs and Deputy
Chief of the White House Staff. Dr. Cavanaugh is on the board of directors of
MedImmune, Inc., and non-executive Chairman of the Board of Shire
Pharmaceuticals Group PLC. He also serves on the boards of the National Center
for Genome Resources and the National Committee for Quality Health Care. Dr.
Cavanaugh received a Ph.D. and M.A. from the University of Iowa and a B.S. from
Farleigh Dickinson University.

   Mr. Daniel T. Carroll has been a director since October 1996. Mr. Carroll
has been Chairman of The Carroll Group, a management consulting firm, since
1982. From early 1980 until early 1982, he was President and Chief Executive
Officer and a director of Hoover Universal, Inc. From 1972 until early 1980, he
was President of Gould Inc. He served as President of the Management Consulting
Division at Booz Allen & Hamilton, Inc. from 1954 to 1972. He is a director of
A.M. Castle & Co., American Woodmark Corporation, Aon Corporation, Comshare,
Inc., Oshkosh Truck Corporation, Wolverine World Wide, Incorporated, and
Woodhead Industries Inc. Mr. Carroll earned an A.B. from Dartmouth College and
an M.A. from the University of Minnesota.

   Ms. Patricia M. Cloherty has been a director since May 1996. Ms. Cloherty is
a Special Limited Partner of Patricof & Co. Ventures, Inc., an international
venture capital company. From 1988 through 1999, she was General Partner, and
successively, Senior Vice President, President and Co-Chairman of that firm.
From 1970 to 1977, she also was General Partner of that firm. She has served in
government, as Deputy Administrator of the U.S. Small Business Administration
from 1977 through 1978 and as Chairman of the U.S. Russia Investment Fund from
1995 to the present. She is past president and chairman of the National Venture
Capital Association and has been honored by the National Association of Small
Business Investment Companies for her work with growth companies. She is a
director of several privately-held companies and of several philanthropies. She
holds a B.A. from the San Francisco College for Women and an M.A. and an M.I.A.
from Columbia University.

   Mr. Peter Johnson has been a director since December 1999. Mr. Johnson was a
founder of Agouron Pharmaceuticals, Inc. and has served as President and Chief
Executive Officer of Agouron since its inception in 1984. He received a B.A.
and an M.A. from the University of California, San Diego.


                                       45
<PAGE>

   Mr. Donald D. Johnston has been a director since September 1993. Since 1986,
Mr. Johnston has worked as a consultant for various companies, including
Johnson & Johnson, Human Genome Sciences, Inc. and HealthCare Investment
Corporation. He worked in product and general management for Johnson & Johnson
from 1962 to 1986, including serving as President of J&J Baby Products Co. from
1972 to 1977. Mr. Johnston also served as a director of Johnson & Johnson from
1975 through 1986. Mr. Johnston currently serves on the board of directors of
Osteotech, Inc. Mr. Johnston received a B.A. from the University of Cincinnati.

   Mr. Mark Leschly has been a director since August 1999. Mr. Leschly is a
managing director of Rho Management Company, Inc. Prior to joining Rho in July
1999, beginning in 1994 Mr. Leschly worked at HealthCare Ventures where he was
a general partner. Prior to Healthcare Ventures, he worked at McKinsey &
Company, a management consulting company. Mr. Leschly is a director of several
privately-held companies and is a member of the advisory board of the Harvard
AIDS Institute. Mr. Leschly received a B.A. from Harvard University and an
M.B.A. from the Stanford Graduate School of Business.

   Dr. Melvin I. Simon has been a director since May 1994. Dr. Simon is
Chairman and has been a professor in the Division of Biology at the California
Institute of Technology since 1982, where he is currently the Anne P. and
Benjamin F. Biaggini Professor of Biological Sciences. From 1965 to 1982, Dr.
Simon was a professor at the University of California, San Diego. He received a
B.S. from the City College of New York and a Ph.D. from Brandeis University.

CLASSIFIED BOARD

   Our certificate of incorporation provides for a classified board of
directors consisting of three classes of directors, each serving staggered
three-year terms. As a result, a portion of our board of directors will be
elected each year. To implement the classified structure, prior to the
consummation of the offering, three of the nominees to the board will be
elected to one-year terms, two will be elected to two-year terms and three will
be elected to three-year terms. After these initial terms, directors will be
elected for three-year terms. Messrs. Carroll and Leschly and Ms. Cloherty and
have been designated Class I directors whose terms expire at the 2001 annual
meeting of stockholders. Messrs. Johnson and Johnston have been designated
Class II directors whose terms expire at the 2002 annual meeting of
stockholders. Drs. Cavanaugh, Short and Simon have been designated Class III
directors whose terms expire at the 2003 annual meeting of stockholders. For
additional discussion regarding the effects of our classified board, see
"Description of Capital Stock--Possible Anti-Takeover Matters."

COMMITTEES OF THE BOARD OF DIRECTORS

   Our human resources committee reviews and makes recommendations to the board
concerning compensation and benefits of all of our executive officers,
administers our stock option plan and establishes and reviews general policies
relating to compensation and benefits of our employees. The human resources
committee currently consists of Mr. Carroll, Dr. Cavanaugh and Ms. Cloherty.

   The audit committee of the board of directors reviews our internal
accounting procedures and consults with and reviews the services provided by
our independent accountants. The audit committee currently consists of Messrs.
Johnson, Johnston and Leschly.

DIRECTOR COMPENSATION

   Prior to the completion of this offering, our directors did not receive cash
compensation for their service as members of the board of directors, except for
Messrs. Carroll and Johnston, who each received $10,000 per year, and Dr.
Simon, who received $25,000 for his service as a director and as a scientific
advisor. Non-employee directors are reimbursed for expenses in connection with
attendance at board and committee meetings. Following the completion of this
offering, our directors will receive $1,500 for each board meeting

                                       46
<PAGE>

attended. Dr. Simon will continue to receive compensation in connection with
his service under our consulting agreement with him. We do not provide
additional compensation for committee participation or special assignments of
the board of directors. From time to time, some of our directors have received
grants of options to purchase shares of our common stock under the 1997 Equity
Incentive Plan in connection with their employment or consulting agreements.
For information concerning options we have granted to our non-employee
directors, please see the description under the caption "Certain Transactions--
Agreements with Officers and Directors" included in this prospectus. See "--
Executive Compensation--Employment Agreements" for a description of employment
agreements with employee directors. Upon the completion of this offering, all
of our non-employee directors will be eligible to receive equity incentives in
the form of stock option grants under our 1999 Non-Employee Directors Stock
Option Plan.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

   During the fiscal year ended December 31, 1999, Mr. Carroll, Dr. Cavanaugh
and Ms. Cloherty served as members of our human resources committee. We have
never employed any member of the human resources committee of our board of
directors. None of our executive officers serves as a member of the board of
directors or compensation committee of any entity that has one or more
executive officers serving on our board of directors or our human resources
committee of the board of directors. For information on recent purchases of our
capital stock by the members of our human resources committee or their
respective affiliates, please see the description under the caption "Certain
Transactions--Sales of Stock and Notes" included in this prospectus.

                                       47
<PAGE>

EXECUTIVE COMPENSATION

   The following table sets forth the compensation awarded or paid to, or
earned or accrued for services rendered to us in all capacities during the
fiscal year ended December 31, 1999 to our current and former Chief Executive
Officer, the four other most highly compensated officers whose total salary and
bonus exceeded $100,000 in fiscal 1999 and our former Chief Financial Officer
who departed from Diversa during the last fiscal year. In accordance with SEC
rules, the compensation described in the table does not include medical, group
life insurance or other benefits which are available generally to all our
salaried employees and perquisites and other personal benefits which do not
exceed the lesser of $50,000 or 10% of the officers' total salary and bonus
disclosed in this table. We refer to these officers as our named executive
officers in other parts of this prospectus.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                 LONG-TERM
                                                                                COMPENSATION
                                                                                   AWARDS
                                                                                ------------
                                                                                 NUMBER OF
                                                     ANNUAL COMPENSATION         SECURITIES
                                                  --------------------------     UNDERLYING
        NAME AND PRINCIPAL POSITION          YEAR  SALARY   BONUS    OTHER        OPTIONS
        ---------------------------          ---- -------- -------- --------    ------------
<S>                                          <C>  <C>      <C>      <C>         <C>
Jay M. Short, Ph.D. (1)..................... 1999 $262,333 $500,000       --            --
  Current President, Chief Executive Officer 1998 $243,000 $545,000       --     1,292,045
  and Chief Technology Officer

Terrance J. Bruggeman (2)................... 1999 $ 72,315 $     -- $316,229(3)         --
  Former Chief Executive Officer             1998 $270,000 $ 65,000 $ 25,000(4)         --

William H. Baum............................. 1999 $207,400 $ 10,000       --       199,609
  Senior Vice President, Business
   Development                               1998 $195,000 $ 28,000       --            --

Karin Eastham (5)........................... 1999 $142,100       --       --       277,718
  Current Senior Vice President, Finance,    1998       --       --       --            --
  Chief Financial Officer and Secretary

R. Patrick Simms............................ 1999 $188,558 $ 10,000       --        95,465
  Senior Vice President, Operations          1998 $173,000 $ 29,000 $  7,096(6)     34,714

Kathleen H. Van Sleen (7)................... 1999 $ 97,898 $     -- $228,467(8)     34,714
  Former Vice President, Finance and         1998 $190,000 $ 36,000 $  4,949(6)         --
  Administration, Chief Financial Officer,
  Treasurer and Secretary
</TABLE>
- --------
(1) In 1998, Dr. Short held the title of Chief Technology Officer and, from
    June 1998, President. At the time of Dr. Short's appointment as President
    in June 1998, he was awarded a bonus of $1,000,000 payable in two equal
    installments of $500,000 in 1998 and 1999. In January 2000, our Board
    granted Dr. Short an option to purchase 206,453 shares of common stock at
    an exercise price equal to the initial public offering price.

(2) Mr. Bruggeman resigned as Chief Executive Officer effective as of February
    1999.

(3) Consists of $4,200 for reimbursement of relocation costs, $297,500 for
    severance payments and $14,529 for separation expenses.

(4) Consists of $16,700 for reimbursement of relocation costs and $8,300 for a
    cost of living adjustment for relocation.

(5) Ms. Eastham commenced her employment as Senior Vice President, Finance,
    Chief Financial Officer and Secretary in April 1999 at a base salary of
    $210,000.

                                       48
<PAGE>

(6) For reimbursement of relocation costs.

(7) Ms. Van Sleen resigned as Vice President, Finance and Administration, Chief
    Financial Officer, Treasurer and Secretary effective as of March 1999.

(8) Consists of $131,125 for separation payments, $55,443 for payments relating
    to Ms. Van Sleen's purchase of a residence and $41,900 of forgiveness of
    indebtedness.

OPTION GRANTS

   The following table sets forth information concerning stock options granted
to our named executive officers during the fiscal year ended December 31, 1999:

                       OPTION GRANTS IN LAST FISCAL YEAR

<TABLE>
<CAPTION>
                                                                      POTENTIAL REALIZABLE
                                    PERCENTAGE                          VALUE AT ASSUMED
                                     OF TOTAL                           ANNUAL RATES OF
                         NUMBER OF   OPTIONS                              STOCK PRICE
                         SECURITIES GRANTED TO                          APPRECIATION FOR
                         UNDERLYING EMPLOYEES   EXERCISE                  OPTION TERM
                          OPTIONS   IN FISCAL     PRICE    EXPIRATION --------------------
          NAME            GRANTED      YEAR    (PER SHARE)    DATE       5%        10%
          ----           ---------- ---------- ----------- ---------- --------- ----------
<S>                      <C>        <C>        <C>         <C>        <C>       <C>
Jay M. Short, Ph.D......       --        --       $ --            --  $      -- $       --

Terrance J. Bruggeman...       --        --         --            --         --         --

William H. Baum.........   17,357       1.1%      0.58      01/07/09    569,000    891,000
                           43,393       2.9%      1.73      06/30/09  1,373,000  2,178,000
                          138,859       9.2%      2.02      10/26/09  4,355,000  6,931,000

Karin Eastham...........  208,289      13.7%      1.73      04/29/09  6,593,000 10,456,000
                           69,429       4.6%      2.02      10/26/09  2,177,000  3,465,000

R. Patrick Simms........   26,036       1.7%      0.58      01/07/09    854,000  1,337,000
                           69,429       4.6%      2.02      10/26/09  2,177,000  3,465,000

Kathleen H. Van Sleen...   34,714       2.3%      0.58      01/07/09  1,139,000  1,783,000
</TABLE>

   The figures above represent options granted under our 1997 Equity Incentive
Plan. We granted options to purchase 1,515,695 shares of our common stock in
1999. All options were granted at an exercise price equal to the fair market
value of the common stock on the date of grant as determined by our board of
directors.

   The options granted to our employees typically vest in 25% increments on
each of the four annual anniversaries of the date of grant. The options granted
to our consultants generally vest in 33% increments on each of the three annual
anniversaries of the date of the grant or in accordance with specified
performance goals over a ten-year term. Options granted to the persons listed
above expire 10 years from the grant date.

   The potential realizable value represents amounts, net of exercise price
before taxes, that may be realized upon exercise of the options immediately
prior to the expiration of their terms assuming appreciation of 5% and 10% over
the option term. The 5% and 10% values are calculated based on rules
promulgated by the SEC and are applied to an assumed initial public offering
price of $21.00 per share and do not reflect our estimate of future stock price
growth. The actual value realized may be greater or less than the potential
realizable value set forth in the table.

   We have never granted stock appreciation rights.

                                       49
<PAGE>

OPTIONS EXERCISED AND FISCAL YEAR-END VALUES

   The following table sets forth information concerning the number and value
of options exercised by each of the named executive officers as of December 31,
1999 and the value and number of unexercised options held by each of the named
executive officers at December 31, 1999. The value of unexercised in-the-money
options at December 31, 1999 represents an amount equal to the difference
between the assumed initial public offering price of $21.00 per share and the
option exercise price, multiplied by the number of unexercised in-the-money
options. An option is in-the-money if the fair market value of the underlying
shares exceeds the exercise price of the options.

                AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>
                                                      NUMBER OF SECURITIES             VALUE OF UNEXERCISED
                                                     UNDERLYING UNEXERCISED           IN-THE-MONEY OPTIONS AT
                                                  OPTIONS AT DECEMBER 31, 1999           DECEMBER 31, 1999
                         SHARES ACQUIRED  VALUE   --------------------------------   -------------------------
          NAME             ON EXERCISE   REALIZED  EXERCISABLE      UNEXERCISABLE    EXERCISABLE UNEXERCISABLE
          ----           --------------- -------- --------------   ---------------   ----------- -------------
<S>                      <C>             <C>      <C>              <C>               <C>         <C>
Jay M. Short, Ph.D......     290,300     $397,324          276,816           724,929 $5,758,000   $14,812,000
Terrance J. Bruggeman...     428,676      560,620               --                --         --            --
William H. Baum.........      95,466      152,350               --           199,609         --     3,826,000
Karin Eastham...........      69,429       16,667               --           208,289         --     3,997,000
R. Patrick Simms........      19,093       30,470           64,437           159,468  1,323,000     3,161,000
Kathleen H. Van Sleen...          --           --          118,463            19,526  2,434,000       400,000
</TABLE>

1994 EMPLOYEE INCENTIVE AND NON-QUALIFIED STOCK OPTION PLAN

   Introduction. On October 12, 1994, our board adopted, and on December 20,
1994, our stockholders approved our 1994 Employee Incentive and Non-Qualified
Stock Option Plan. The plan was subsequently amended to, among other things,
authorize a total of 2,912,587 shares of common stock for issuance under the
plan. The 1994 plan was terminated by our board on August 28, 1997. We will not
grant any additional stock options under the 1994 plan; however, termination of
the plan did not affect any outstanding options which remained in effect. Since
the plan has been terminated, shares subject to stock awards that in the past
have expired, and in the future either expire or otherwise terminate, without
having been exercised in full, will not be available for grant under the plan.

   The terminated 1994 plan permitted the grant of options to our directors
employed by us, officers, employees and consultants. Outstanding options are
either incentive stock options within the meaning of Section 422 of the
Internal Revenue Code to employees or nonstatutory stock options.

   The 1994 plan is administered by the board or a committee appointed by the
board. The board has delegated the authority to administer the 1994 plan to its
human resources committee. Subject to the limitations set forth in the 1994
plan, the board and the committee exercised the authority to select the
eligible persons to whom award grants are to be made, to designate the number
of shares to be covered by stock options, to determine whether an option was an
incentive stock option or a nonstatutory stock option, to establish vesting
schedules, to specify the exercise price of options and the type of
consideration to be paid upon exercise and, subject to specified restrictions,
to specify other terms of awards.

   The maximum term of options granted under the 1994 plan is ten years. Stock
options granted under the 1994 plan generally are non-transferable. Options
exercisable on the date of termination of employment, or such other
relationship with us, generally expire three months after the termination of an
optionholder's service, except that all unexercised options will be immediately
terminated if the optionholder is terminated for cause or if the board makes a
determination that the optionee was engaged in disloyalty, convicted of a
felony, disclosed company trade secrets or breached a non-competition agreement
with us. However, if an optionholder is permanently disabled or dies during his
or her service, that person's options exercisable on the date of disability or
death generally may be exercised up to 12 months following disability or death
unless, in the case of disability, such person commences employment with a
competitor during such time.

                                       50
<PAGE>

   The exercise prices of options granted under the 1994 plan were determined
by the board or committee in accordance with the guidelines set forth in the
1994 plan. The exercise prices of incentive stock options granted under the
plan could not be less than 100% of the fair market value of the common stock
on the date of the grant or 110% of the fair market value on the date of the
grant if the optionee, at the time of the grant, owned more than 10% of the
total combined voting power of all of our stock. The exercise price of a
nonstatutory stock option could not be less than $0.01 per share.

   In the event of a change in control in our ownership as defined in our plan,
all outstanding stock awards under the 1994 plan must either be assumed or
substituted by the surviving entity. In the event the surviving entity does not
assume or substitute such stock awards, then the vesting and exercisability of
outstanding awards will accelerate prior to the change in control and such
awards will terminate to the extent not exercised prior to the change in
control.

   Notwithstanding the previously described change in control provision, in the
event that a change in control occurs and within one month prior to, or 13
months after, such change in control an employee's employment is involuntarily
terminated as defined in the 1994 plan, then the vesting and exercisability of
all options held by such employee under the 1994 plan will be accelerated in
full on the effective date of his involuntary termination.

   As of December 31, 1999, we had issued and outstanding under the 1994 plan
options to purchase approximately 109,847 shares of common stock and
approximately 841,986 shares of common stock had been purchased upon the
exercise of options under the 1994 plan. The per share exercise prices of these
options range from $0.03 to $0.73.

1997 EQUITY INCENTIVE PLAN

   On August 28, 1997, our board adopted our 1997 Equity Incentive Plan, and
the plan was approved by our stockholders on October 15, 1997. The plan has
been subsequently amended, most recently in 1999 to authorize a total of
5,982,633 shares of common stock for issuance under the plan. Shares subject to
stock awards that have expired or otherwise terminated without having been
exercised in full again become available for grant.

   The 1997 plan permits the grant of options to our directors, employees and
consultants. Options may be either incentive stock options to employees within
the meaning of Section 422 of the Internal Revenue Code or nonstatutory stock
options. In addition, the 1997 plan permits the grant of stock bonuses and
rights to purchase restricted stock. Except in specified circumstances, no
person may be granted options covering more than 694,299 shares of common stock
in any calendar year.

   The 1997 plan is administered by the board or a committee appointed by the
board. The board has delegated the authority to administer the 1997 plan to its
human resources committee. Subject to the limitations set forth in the 1997
plan, the compensation committee and the administrator have the authority to
select the eligible persons to whom grants are to be made, to designate the
number of shares to be covered by each award, to determine whether an option is
to be an incentive stock option or a nonstatutory stock option, to establish
vesting schedules, to specify the exercise price of options and the type of
consideration to be paid upon exercise and, subject to specified restrictions,
to specify other terms of awards.

   The maximum term of options granted under the 1997 plan is ten years.
Incentive stock options granted under the 1997 plan generally are non-
transferable. Nonstatutory stock options generally are nontransferable,
although the applicable option agreement may permit some transfers. Options
generally expire three months after the termination of an optionholder's
service. However, if an optionholder is permanently disabled or dies during his
or her service, that person's options generally may be exercised up to 12
months following disability or death.

   The exercise price of options granted under the 1997 plan is determined by
the board or committee in accordance with the guidelines set forth in the 1997
plan. The exercise price of an incentive stock option

                                       51
<PAGE>

cannot be less than 100% of the fair market value of the common stock on the
date of the grant. The exercise price of a nonstatutory stock option cannot be
less than 85% of the fair market value of the common stock on the date of
grant.

   The board or the committee will have the authority, with the consent of the
affected optionholders, to cancel outstanding options under the plan in return
for the grant of new options for the same or a different number of option
shares with an exercise price per share based upon the fair market value of our
common stock on the new grant date.

   Options granted under the 1997 plan vest at the rate determined by the board
or committee and specified in the option agreement. The terms of any stock
bonuses or restricted stock purchase awards granted under the 1997 plan will be
determined by the board or committee. The purchase price of restricted stock
under any restricted stock purchase agreement will be determined by the board
or committee and will not be less than 85% of the fair market value of our
common stock on the date of grant. Stock bonuses and restricted stock purchase
agreements awarded under the 1997 plan are generally nontransferable, although
the applicable award agreement may permit some transfers.

   In the event of a change in control in our ownership as defined in our plan,
all outstanding stock awards under the 1997 plan must either be assumed or
replaced with substitute awards by the surviving entity. In the event the
surviving entity does not assume or substitute such stock awards, then the
vesting and exercisability of outstanding awards will accelerate prior to the
change in control and such awards will terminate to the extent not exercised
prior to the change in control. Notwithstanding the previously described change
in control provision, in the event that a change in control occurs and within
one month prior to, or 13 months after, such change in control an employee's
employment is involuntarily terminated as defined in the 1997 plan, then the
vesting and exercisability of all options held by such employee under the 1997
plan will be accelerated in full on the effective date of his involuntary
termination.

   The board may amend or terminate the 1997 plan at any time. Amendments will
generally be submitted for stockholder approval to the extent required by
applicable law.

   As of December 31, 1999, we had issued and outstanding under the 1997 plan
options to purchase approximately 3,014,988 shares of common stock and
approximately 599,775 shares had been purchased upon the exercise of options.
The per share exercise prices of these options range from $0.43 to $8.65.

NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

   In December 1999, our board adopted our 1999 Non-Employee Directors' Stock
Option Plan. We intend to seek stockholder approval of the plan prior to the
closing of this offering. The plan provides for the automatic grant of options
to purchase shares of common stock to our non-employee directors. The
directors' plan is administered by the board, unless the board delegates
administration to a committee of at least two disinterested directors.

   A total of 277,719 shares of common stock have been reserved for issuance
under the directors' plan, none of which are currently subject to outstanding
options. Pursuant to the terms of the directors' plan:

  .  On the closing of this offering, each person who is then a non-employee
     director will be granted an option to purchase 27,771 shares of common
     stock;

  .  Each person who, after the closing of this offering, for the first time
     becomes a non-employee director automatically will be granted, upon the
     date of his or her initial appointment or election to be a non-employee
     director, a one-time option to purchase 27,771 shares of common stock,
     provided such person has not previously been in our employ; and

  .  On the day following each annual meeting of our stockholders commencing
     with the 2001 annual meeting of stockholders, each person who is elected
     to be a non-employee director at such annual meeting automatically will
     be granted an option to purchase 6,943 shares of common stock, pro-rated
     to the extent that a director did not serve as a director for a full
     year prior to the annual meeting.

                                       52
<PAGE>

   Options granted under the directors' plan shall vest in equal monthly
installments over three years from the date of grant and must be exercised
within ten years from the date they are granted, subject to earlier termination
following the optionee's cessation of service. Options granted under the
directors' plan may be exercised prior to vesting, subject to our repurchase.
Outstanding options under the plan will vest in full on an accelerated basis
upon certain changes in control or ownership of the Company, unless assumed or
replaced with substitute options by the successor entity. The exercise price of
options under the directors' plan will equal 100% of the fair market value of
the common stock on the date of grant. Options granted under the directors'
plan are generally transferable to family members and trusts under which the
director or members of the director's family are beneficiaries. Unless
otherwise terminated or amended by the board of directors, the directors' plan
automatically terminates when all of our common stock reserved for issuance
under the directors' plan has been issued.

EMPLOYEE STOCK PURCHASE PLAN

   In December 1999, our board adopted the 1999 Employee Stock Purchase Plan.
We intend to seek stockholder approval of the plan prior to the closing of this
offering. A total of 416,579 shares of common stock initially has been reserved
for issuance under the purchase plan. The share reserve will automatically
increase on the day of each annual stockholders' meeting by an amount equal to
three-fourths of one percent (0.75%) of the total number of outstanding shares
of our common stock on the day of the annual stockholders' meeting, or an
amount determined by our board, but in no event will any such annual increase
exceed 347,149 shares. The purchase plan is intended to qualify as an employee
stock purchase plan within the meaning of Section 423 of the Internal Revenue
Code. Under the purchase plan, the board of directors may authorize
participation by eligible employees, including officers, in periodic offering
following the commencement of the purchase plan. The initial offering under the
purchase plan will commence on the effective date of this offering and
terminate on February 28, 2002.

   Unless otherwise determined by the board, employees are eligible to
participate in the purchase plan only if they are employed by us or one of our
subsidiaries designated by the board of directors for at least 20 hours per
week, are customarily employed for at lest five months per calendar year and do
not beneficially own more than 5% of our outstanding capital stock. Employees
who participate in an offering may have up to 15% of their earnings withheld
pursuant to the purchase plan. The amount withheld is then used to purchase
shares of common stock on specified dates determined by the board of directors.
The price of common stock purchased under the purchase plan shall be at least
85% of the lower of the fair market value of the common stock at the
commencement date of each offering period or the fair market value of the
common stock at the relevant purchase date. Employees may end their
participation in the offering at any time during the offering period, and
participation ends automatically on termination of employment.

   In the event of a merger, reorganization, consolidation or liquidation, the
board of directors has discretion to provide that each right to purchase common
stock will be assumed or an equivalent right substituted by the successor
corporation or the board of directors may provide for all sums collected by
payroll deductions to be applied to purchase stock immediately prior to such
merger or other transaction. The board of directors has the authority to amend
or terminate the purchase plan, provided, however, that no such action may
adversely affect any outstanding rights to purchase common stock.


                                       53
<PAGE>

EMPLOYMENT AGREEMENTS

   In August 1994, we entered into an employment offer letter with Jay M.
Short, Ph.D., our President, Chief Executive Officer and Chief Technology
Officer. Pursuant to his employment offer letter, Dr. Short's annual
compensation was initially set at a base salary of $200,000 and a target bonus
of 20% of his base salary. The 20% bonus was guaranteed for the first year. We
also paid Dr. Short a signing bonus of $75,000. In addition, we granted Dr.
Short 56,847 shares of our common stock and he also received a stock option
under our 1994 plan to purchase 34,108 shares of common stock at an exercise
price of $0.03 per share. This option vested 25% in September 1995, with the
remainder vesting annually over the following three years. In the event
Dr. Short's employment is terminated without cause, he will receive severance
compensation equal to six months' salary.

   In June 1998 we entered into a second letter agreement with Dr. Short under
which we paid Dr. Short a bonus of $500,000 in each of June 1998 and June 1999
and granted him a stock option under our 1997 plan to purchase 1,001,744 shares
of our common stock at an exercise price of $0.58 per share. This option vested
25% in June 1999 with the remainder vesting in equal quarterly installments
over the following three years. However, vesting this option will be
accelerated in full upon the sale of Diversa or upon Dr. Short's termination of
employment without cause. This second offer letter also provides that if Dr.
Short's employment is terminated without cause at any time prior to June 25,
2000 he will receive severance compensation equal to twenty-four months'
salary. After June 25, 2000, Dr. Short's severance will revert to six months'
salary as described in his original offer letter. In January 2000, we granted
Dr. Short a stock option under our 1997 plan to purchase 206,453 shares of
common stock at an exercise price equal to the initial public offering price.
This option vests 25% at the first anniversary of the grant date, with the
remainder vesting over the following three years.

   In February 1997, we entered into an employment offer letter with R. Patrick
Simms, our Senior Vice President, Operations. Pursuant to his employment offer
letter, Mr. Simms' annual compensation was initially set at a base salary of
$165,000 and a bonus of up to 20% of his base salary. The calculation of each
annual bonus is based on both Mr. Simms' job performance as well as our
performance. In addition, we granted Mr. Simms a stock option under our 1997
plan to purchase 69,429 shares of our common stock at an exercise price of
$0.43 per share. This option vests 25% on the first anniversary of the date of
grant with the remainder vesting quarterly over the following three years. Mr.
Simms was also offered the right to purchase up to $50,000 of our series B
preferred stock on the same terms offered to our other series B preferred stock
investors. Mr. Simms exercised this right in May 1997 and acquired 39,147
shares of our series B preferred stock in exchange for $25,000 in cash and
delivery of a promissory note for $25,000. The note carries an interest rate of
6.64%, is payable in four equal annual installments commencing in March 1998
and is secured by his shares of series B preferred stock. Mr. Simms also was
reimbursed $25,000 for relocation costs. In the event that Mr. Simms'
employment is terminated without cause, he will receive severance compensation
equal to six months' base salary and benefits until he commences new
employment.

   In July 1997, we entered into an employment offer letter with William H.
Baum, our Senior Vice President, Business Development. Pursuant to his
employment offer letter, Mr. Baum's annual compensation was initially set at a
base salary of $195,000 and a target bonus of 20% of his base salary, with a
guaranteed bonus of $13,000 for 1997 only. We also paid him a hiring bonus of
$30,000, paid in two equal installments on September 1, 1997 and March 1, 1998.
In addition, we granted Mr. Baum a stock option under our 1997 plan to purchase
95,466 shares of our common stock at an exercise price of $0.43 per share. This
option vests 25% on the first anniversary of his date of hire with the
remainder vesting quarterly over the following three years. In the event Mr.
Baum's employment is terminated without cause, he will receive severance
compensation equal to six months of his then-current base salary and we will
continue to pay his employee benefits until he commences new employment. Mr.
Baum was reimbursed $50,000 for relocation costs. Mr. Baum was offered the
right to purchase up to $50,000 of our series D preferred stock on the same
terms offered to our other series D preferred stock investors. Mr. Baum
exercised this right in October 1997 and acquired 58,824 shares of our series D
preferred stock in exchange for delivery of a promissory note for $50,000. The
note carries an interest

                                       54
<PAGE>

rate of 6.64%, is payable in four equal annual installments commencing in
October 1998 and is secured by his shares of series D preferred stock.

   In April 1999, we entered into an employment offer letter with Karin
Eastham, our Senior Vice President, Finance and Chief Financial Officer.
Pursuant to her employment offer letter, Ms. Eastham's annual compensation was
initially set at a base salary of $210,000 and a target bonus of 20% of her
base salary. The 20% bonus was guaranteed for the first year. In addition, we
granted Ms. Eastham a stock option under our 1997 plan to purchase 208,289
shares of our common stock at an exercise price of $1.73 per share. This option
vests 25% at the earlier of the first anniversary of the date of hire or the
closing of this initial public offering, with the remainder vesting quarterly
over three years.

   For a description of recent severance agreements with Terrance J. Bruggeman
and Kathleen H. Van Sleen, see the descriptions provided under the caption
"Certain Transactions -- Agreements with Officers and Directors."

LIMITATION ON LIABILITY AND INDEMNIFICATION MATTERS

   Our certificate of incorporation limits the liability of directors to the
maximum extent permitted by Delaware law. In addition, our bylaws require us to
indemnify our directors and officers, and allow us to indemnify our other
employees and agents, to the fullest extent permitted by law. We have also
entered into agreements to indemnify some of our directors and executive
officers. We believe that these provisions and agreements are necessary to
attract and retain qualified directors and executive officers. At present,
there is no pending litigation or proceeding involving any director, officer,
employee or agent where indemnification will be required or permitted. We are
not aware of any threatened litigation or proceeding that might result in a
claim for such indemnification. Insofar as indemnification for liabilities
arising under the Securities Act may be permitted to directors, officers or
persons controlling our company pursuant to the foregoing provisions, we have
been informed that, in the opinion of the SEC, such indemnification is against
public policy as expressed in the Securities Act and is therefore
unenforceable.

                                       55
<PAGE>

                              CERTAIN TRANSACTIONS

SALES OF STOCK AND NOTES

   Series B Preferred Stock Financing. In May 1997, Mr. Simms, our Senior Vice
President, Operations, and Ms. Van Sleen, our former Chief Financial Officer,
Vice President, Finance and Administration and Secretary, exercised rights to
purchase 37,879 and 75,758 shares, respectively, of our series B preferred
stock at a price of $0.66 per share. The shares of series B preferred stock
issued to Mr. Simms and Ms. Van Sleen will automatically convert into an
aggregate of 39,449 shares of common stock upon the closing of this offering.
Mr. Simms paid for a portion of his shares and Ms. Van Sleen paid for all of
her shares by delivering full-recourse promissory notes in the amount of
$25,000 and $50,000, respectively. The notes are payable over four years in
equal annual installments commencing on March 30, 1998, and bear interest at
6.64% per year. In 1999, we forgave the then outstanding balance under the note
receivable from Ms. Van Sleen, $37,500, pursuant to the terms of a severance
agreement more fully described below.

   Bridge Loan Financing. In September 1997, we issued and sold $3,432,804 of
secured convertible promissory notes to 15 accredited investors. The promissory
notes carried an interest rate of 8.0% per year and under their terms
automatically converted into 4,038,592 shares of series D preferred stock in
October 1997. This series D preferred stock will automatically convert into an
aggregate of 1,401,996 shares of common stock upon the closing of this
offering. Investors owning 5% or more of our capital stock and directors and
officers who participated in this transaction include:

<TABLE>
<CAPTION>
                                                                  NUMBER OF
                                                                  SHARES OF
                                           NUMBER OF SHARES OF  COMMON STOCK
                                           SERIES D PREFERRED  UPON CONVERSION
                                               STOCK UPON        OF SERIES D
    INVESTOR               PROMISSORY NOTE     CONVERSION      PREFERRED STOCK
    --------               --------------- ------------------- ---------------
<S>                        <C>             <C>                 <C>
HealthCare Ventures
 Entities.................   $1,001,162         1,177,837          408,885
Patricof & Co. Ventures
 Entities.................    1,000,000         1,176,470          408,411
Rho Management Trust II...      410,153           482,532          167,510
Donald D. Johnston........      500,000           588,235          204,205
Melvin I. Simon, Ph.D. ...       20,000            23,529            8,168
</TABLE>

   Dr. Cavanaugh, one of our directors, is a general partner of HealthCare
Partners III, L.P., HealthCare Partners IV, L.P. and HealthCare Partners V,
L.P., which are the general partners of HealthCare Ventures III, L.P.,
HealthCare Ventures IV, L.P. and HealthCare Ventures V, L.P., respectively.
Together, these partnerships own greater than 10% of our capital stock. In this
prospectus we refer to HealthCare Ventures III, L.P., HeathCare Ventures IV,
L.P. and HealthCare Ventures V, L.P., collectively, as entities affiliated with
HealthCare Ventures.

   Ms. Cloherty, one of our directors, is a special limited partner of funds
managed by Patricof & Co. Ventures, Inc., including APA Pennsylvania Partners
II, L.P., APA Excelsior IV, L.P. and APA Excelsior IV/Offshore, L.P. APA
Pennsylvania Partners II, L.P. is the general partner of The P/A Fund, L.P.
Patricof & Co. Managers, Inc. is the general partner of APA Excelsior IV
Partners, L.P., the general partner of Patricof Private Investment Club, L.P.
Collectively, APA Excelsior IV, L.P., APA Excelsior IV/Offshore, L.P., The P/A
Fund, L.P. and Patricof Private Investment Club, L.P. own greater than 10% of
our capital stock, and are collectively referred to in this prospectus as
entities affiliated with Patricof & Co. Ventures.

   Mr. Leschly, one of our directors, is a managing director of Rho Management
Company, Inc., which serves as the investment advisor to Rho Management Trust
II.

   Mr. Johnston and Dr. Simon are members of our board of directors.

   Series D Preferred Stock Financing. In October 1997, we issued 24,809,555
shares of series D preferred stock for $0.85 per share to 27 accredited
investors. The series D preferred stock will automatically convert

                                       56
<PAGE>

into an aggregate of 8,612,620 shares of common stock upon the closing of this
offering. Investors owning 5% or more of our shares and directors and officers
who participated in this transaction include:

<TABLE>
<CAPTION>
                                                                    NUMBER OF
                                                                    SHARES OF
                                                    NUMBER OF     COMMON STOCK
    INVESTOR                                     SERIES D SHARES UPON CONVERSION
    --------                                     --------------- ---------------
<S>                                              <C>             <C>
HealthCare Ventures Entities....................    6,206,103       2,154,446
Patricof & Co. Ventures Entities................    2,184,999         758,519
Rho Management Trust II.........................    2,336,042         810,856
State of Michigan...............................    5,882,353       2,042,058
William H. Baum.................................       58,824          20,420
Donald D. Johnston..............................      588,235         204,205
Melvin I. Simon, Ph.D. .........................       23,529           8,168
</TABLE>

   Mr. Baum is our Senior Vice President, Business Development.

   Series E Preferred Stock Financing. In connection with our entering into a
collaboration agreement with Novartis Agribusiness Biotechnology Research, Inc.
in January 1999, we sold 5,555,556 shares of series E preferred stock to
Novartis for $1.32 per share under the terms of a series E preferred stock
purchase agreement. The series E preferred stock will automatically convert
into an aggregate of 1,928,610 shares of common stock upon the closing of this
offering. The stock purchase agreement designates a portion of the total
proceeds received of $12.5 million as a technology access fee and another
portion as advance payments for research support under the collaboration
agreement.

   The shares of series E preferred stock were subsequently transferred to
Novartis Seeds AG, an affiliate of Novartis Agribusiness Biotechnology
Research, Inc. In December 1999, we entered into a joint venture agreement with
Novartis Seeds AG. For a further description of this joint venture and the
collaboration agreement, see "Business--Current Alliances and Other
Agreements."

   Registration Rights. In connection with the preferred stock financings, we
granted registration rights to all of our preferred stockholders. See
"Description of Capital Stock--Registration Rights" for a more complete
description of registration rights we granted to our stockholders.

AGREEMENTS WITH OFFICERS AND DIRECTORS

   In May 1994, we entered into a four year consulting agreement with Melvin I.
Simon, Ph.D. under which Dr. Simon agreed to provide us with at least 20 days
of service each year. Under his agreement, Dr. Simon will serve as a member and
chairman of our scientific advisory board, serve on our board of directors and
provide other consulting services. His compensation initially was set at
$75,000 per year, payable quarterly. We amended Dr. Simon's consulting
agreement in October 1996 to limit Dr. Simon's services to attendance at up to
three scientific advisory board meetings and 12 board and board committee
meetings per year and reducing his annual compensation to $25,000 per year. In
addition, we granted Dr. Simon a stock option to purchase 6,942 shares of our
common stock under our 1994 plan in consideration for his agreement to amend
the original agreement. This initial 6,942 share option was fully vested and
exercisable upon its grant to Dr. Simon and carried an exercise price of $0.42
per share. We also granted Dr. Simon a second stock option to purchase 20,828
shares of common stock having an exercise price of $0.42 per share that vested
over a period of three years. This second option grant was fully vested
effective as of October 1999.

   We amended Dr. Simon's consulting agreement a second time in October 1999.
This second amendment provides that Dr. Simon's annual compensation will
continue at $25,000 per year for an additional three year term. This second
amendment also provides that Dr. Simon will attend up to six board meetings and
one scientific advisory board meeting per year. We will pay Dr. Simon an
additional $1,000 per day for any additional service he performs. We also
granted Dr. Simon a stock option to purchase 22,564 shares of our

                                       57
<PAGE>

common stock under our 1997 plan, with 8,678 shares vesting in October 2000 and
6,943 shares in each of the following two years.

   In December 1999, we granted Dr. Simon a stock option under our 1997 plan to
purchase 173,574 shares of our common stock with an exercise price of $8.64 per
share. One third of the shares subject to this option were vested upon grant
and the remaining shares vested in February 2000 when the option vesting
schedule was accelerated by our Board. The Company recorded a charge to
operations of approximately $1.7 million based on the fair value of the
options.

   In August 1997, we granted Daniel T. Carroll a stock option under our 1997
plan to purchase 5,207 shares of our common stock with an exercise price of
$0.43 per share. One-third of the shares vested on October 1, 1997 and one-
twelfth vested quarterly thereafter until fully vested. In February 1998 we
granted Mr. Carroll a second stock option under our 1997 plan to purchase 5,207
shares of our common stock with an exercise price of $0.58 per share. This
option vests in equal annual installments over a period of three years. In
December 1999 we granted Mr. Carroll a third stock option under our 1997 plan
to purchase 17,357 shares of our common stock with an exercise price of $8.64
per share. This option was fully vested upon grant.

   In August 1997, we granted Donald D. Johnston a stock option under our 1997
plan to purchase 5,207 shares of our common stock with an exercise price of
$0.43 per share. One-third of the shares vested on October 1, 1997 and one-
twelfth vested quarterly thereafter until fully vested. In February 1998 we
granted Mr. Johnston a second stock option under our 1997 plan to purchase
5,207 shares of our common stock with an exercise price of $0.58 per share.
This option vests in equal annual installments over a period of three years. In
December 1999 we granted Mr. Johnston a third stock option under our 1997 plan
to purchase 17,357 shares of our common stock with an exercise price of $8.64
per share. This option was fully vested upon grant.

   In February 1999, we entered into a Separation Agreement with Terrance J.
Bruggeman, our former Chief Executive Officer. Under this agreement, we agreed
to continue to make severance payments to Mr. Bruggeman in the form of
continuation of his base salary until the earlier of 12 months following his
final day of employment or the date on which he begins employment with another
company. We further agreed to pay Mr. Bruggeman an additional $50,000 as an
additional severance payment, reimburse him up to an additional $25,700 for
various other expenses and pay for up to 18 months of continued health and
dental insurance following his final day of employment. In addition, effective
as of his last day of employment, we accelerated the vesting of options to
purchase an aggregate of 142,892 shares of our common stock having an exercise
price of $0.43 per share. In conjunction with this agreement modification, the
Company recorded a charge to compensation expense of $557,000.

   In March 1999, we entered into a Separation Agreement with Kathleen H. Van
Sleen, our former Chief Financial Officer, Vice President, Finance and
Administration, Treasurer and Secretary. Under this agreement, we paid Ms. Van
Sleen $224,000 and forgave outstanding indebtedness of $42,000. We further
agreed to pay for up to 12 months of health, dental and life insurance. In
addition, we agreed that the term and vesting of options to purchase an
aggregate of 208,289 shares of our common stock will continue until March 30,
2000, after which Ms. Van Sleen will have 90 days to exercise her vested
options. The extension of vesting on those options will result in the vesting
of an additional 62,920 options with an average exercise price of $0.46 per
share. In conjunction with this agreement modification and an extension of the
exercise date for her previously vested options, the Company recorded a charge
to compensation expense of $538,000. Ms. Van Sleen is not required to perform
consulting or any other services as part of the separation agreement.

   Both Mr. Bruggeman and Ms. Van Sleen terminated their employment with
Diversa in the ordinary course of business in connection with our continued
evolution and growth.

   In December 1999, we granted Peter Johnson a stock option under our 1997
plan to purchase 41,657 shares of our common stock with an exercise price of
$5.76 per share. This option vests in equal annual installments over a period
of three years.

                                       58
<PAGE>


   In November 1999, our Board implemented a program to allow optionees to
early exercise stock options prior to vesting. Six optionees, including Jay
Short, Karin Eastham, William Baum and Melvin Simon, purchased our common stock
pursuant to this program. This stock was subject to repurchase restrictions
which lapsed over the same period as the predecessor stock options would have
vested. As part of our agreement to amend the options, we agreed to prepare tax
election forms for the benefit of the optionees. These tax election forms were
not prepared or timely filed and, as a result, the optionees were exposed to
substantial potential tax liabilities. In order to minimize the potential
adverse tax consequences to the optionees, on February 7, 2000, our Board
removed the stock repurchase restrictions and agreed to advance funds to the
optionees in an amount necessary to provide the cash to pay the individual tax
liabilities that resulted from removal of the repurchase restrictions. After
consideration of each optionee's individual tax situation and in order to
fairly rectify the effect of our failure to timely prepare these tax election
forms, our Board agreed to compensate two optionees, Ms. Eastham and Dr. Simon,
directly in amounts of approximately $80,000 and $160,000, respectively, to
compensate for the permanent tax liabilities associated with our failure to
complete the filings. We will record this cash compensation charge to
operations in the first quarter of 2000. Additionally, our board approved the
acceleration of vesting of the 207,000 unvested options related to those option
grants, and we will record a non-cash compensation charge of approximately $4.1
million in the first quarter of 2000 as a result of this acceleration. Our
Board also agreed to make full recourse secured loans to the optionees,
including approximately $400,000.00 to Dr. Short, $400,000.00 to Ms. Eastham,
$250,000.00 to Mr. Baum and $100,000.00 to Dr. Simon, to assist with temporary
differences in taxation. The loans carry a market interest rate and are
repayable in five years, and prepayment is required in specified circumstances,
including if the employee leaves the Company or sells the related shares of
stock.

   All of the shares of preferred stock and promissory notes described under
this section were issued in reliance upon the exemption provided by Section
4(2) of the Securities Act and/or Regulation D under the Securities Act. With
respect to the issuance of options described under this section, exemption from
registration was not necessary in that the transactions did not involve a
"sale" of securities as that term is used in Section 2(a)(3) of the Securities
Act.

                                       59
<PAGE>

                             PRINCIPAL STOCKHOLDERS

   The following table sets forth information with respect to the beneficial
ownership of our common stock as of December 31, 1999, and after the sale of
shares in this offering, by:

  .  Each person who is known by us to own beneficially more than 5% of our
     outstanding common stock;

  .  Each named executive officer;

  .  Each of our directors; and

  .  All of our current directors and executive officers as a group.

   Except as indicated below, the persons named in the table have sole voting
and investment power with respect to all shares of common stock shown as
beneficially owned by them, subject to community property laws where
applicable. Unless otherwise indicated, the address for each stockholder is c/o
Diversa Corporation, 10665 Sorrento Valley Road, San Diego, California 92121.
Beneficial ownership is determined in accordance with the rules of the SEC and
generally includes voting or investment power with respect to securities.
Percentage of beneficial ownership is based on 25,779,401 shares of common
stock outstanding as of December 31, 1999 and assuming 32,811,401 shares of
common stock outstanding after completion of this offering.

   The table assumes no exercise of the underwriters' over-allotment option. If
the underwriters' over-allotment option is exercised in full, we will sell up
to an aggregate of 1,050,000 shares of our common stock, and up to 33,861,401
shares of common stock will be outstanding after completion of this offering.

<TABLE>
<CAPTION>
                                                      BENEFICIAL OWNERSHIP PRIOR TO OFFERING
                                                 ------------------------------------------------
                                                                                                    PERCENTAGE OF
                                                                SHARES ISSUABLE    SHARES DIVERSA      SHARES
                                                                  PURSUANT TO      MAY REPURCHASE   BENEFICIALLY
                                                  NUMBER OF       OPTIONS AND      WITHIN 60 DAYS       OWNED
                                                    SHARES    WARRANTS EXERCISABLE       OF       -----------------
                                                 BENEFICIALLY    WITHIN 60 DAYS     DECEMBER 31,   BEFORE   AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER                OWNED     OF DECEMBER 31, 1999    1999(1)     OFFERING OFFERING
- ------------------------------------             ------------ -------------------- -------------- -------- --------
<S>                                              <C>          <C>                  <C>            <C>      <C>
Funds Affiliated with HealthCare Ventures (2)..   5,744,544         139,265                --       22.2%   17.4%
 44 Nassau St.
 Princeton, New Jersey 08542

Funds Affiliated with Patricof & Co.
 Ventures, Inc. (3)............................   4,616,965              --                --       17.9%   14.1%
 445 Park Avenue, 11th Floor
 New York, New York 10022

Rho Management Trust II (4)....................   2,353,438          20,461                --        9.1%    7.2%
 767 Fifth Avenue, 43rd Floor
 New York, New York 10153

State of Michigan .............................   2,042,058              --                --        7.9%    6.2%
 Department of Treasury, Treasury Building
 30 West Allegan
 East Lansing, Michigan 48922

Novartis Seeds AG .............................   1,928,610              --                --        7.5%    5.9%
 Schwarzwaldallee 215
 CH-4002 Basel
 Switzerland

Jay M. Short, Ph.D.............................     712,994         338,615            61,803        2.7%    2.2%
Terrance J. Bruggeman..........................     428,676              --                --        1.7%    1.3%
William H. Baum................................     120,225           4,339            41,767          *        *
Karin Eastham..................................      69,429              --            69,429          *        *
R. Patrick Simms...............................     110,138          77,456                --          *        *
Kathleen H. Van Sleen..........................     153,440         127,461                --          *        *
</TABLE>

                                       60
<PAGE>

<TABLE>
<CAPTION>
                                      BENEFICIAL OWNERSHIP PRIOR TO OFFERING
                                 ------------------------------------------------
                                                                                    PERCENTAGE OF
                                                SHARES ISSUABLE    SHARES DIVERSA      SHARES
                                                  PURSUANT TO      MAY REPURCHASE   BENEFICIALLY
                                  NUMBER OF       OPTIONS AND      WITHIN 60 DAYS       OWNED
                                    SHARES    WARRANTS EXERCISABLE       OF       -----------------
NAME AND ADDRESS OF BENEFICIAL   BENEFICIALLY    WITHIN 60 DAYS     DECEMBER 31,   BEFORE   AFTER
OWNER                               OWNED     OF DECEMBER 31, 1999    1999(1)     OFFERING OFFERING
- ------------------------------   ------------ -------------------- -------------- -------- --------
<S>                              <C>          <C>                  <C>            <C>      <C>
James H. Cavanaugh, Ph.D. (2)..    5,744,544        139,265                --       22.2%   17.4%
Daniel T. Carroll..............       26,035         26,035                --          *        *
Patricia M. Cloherty (3).......    4,616,968             --                --       17.9%   14.1%
Peter Johnson..................           --             --                --          *        *
Donald D. Johnston.............      621,667         26,035                --        2.4%    1.9%
Mark Leschly (4)...............    2,353,438         20,461                --        9.1%    7.2%
Melvin I. Simon, Ph.D. ........      219,048         57,858            22,564          *        *
All executive officers and
 directors as a group (12
 persons)......................   14,617,864        713,442           195,563       55.2%   43.6%
</TABLE>
- --------
  *  Less than one percent.

 (1) On February 7, 2000, our Board approved the removal of these stock
     repurchase restrictions. See "Certain Transactions."

 (2) Includes:

   .  3,229,005 shares held by HealthCare Ventures III, L.P., including
      107,659 shares issuable upon exercise of warrants exercisable within 60
      days of December 31, 1999, which represents 12.5% and 10.0%,
      respectively, of the total number of shares outstanding before and
      after this offering.

   .  949,145 shares held by HealthCare Ventures IV, L.P., including 31,606
      shares issuable upon exercise of warrants exercisable within 60 days of
      December 31, 1999, which represents 3.7% and 2.9%, respectively, of the
      total number of shares outstanding before and after this offering.

   .  1,566,394 shares held by HealthCare Ventures V, L.P., which represents
      6.1% and 4.9%, respectively, of the total number of shares outstanding
      before and after this offering.

   James H. Cavanaugh, Ph.D. is a managing member of the general partner of
   each of the above-listed investment funds, and shares investment and
   voting power over these shares with the other managing members of each of
   the general partners of these funds, none of whom are affiliated with us.
   Dr. Cavanaugh disclaims beneficial ownership of such shares except to the
   extent of his pecuniary interest therein.

 (3) Includes:

   .  3,049,566 shares held by APA Excelsior IV, L.P., which represents 11.8%
      and 9.4%, respectively, of the total number of shares outstanding
      before and after this offering.

   .  969,468 shares held by The P/A Fund, L.P., which represents 3.8% and
      3.0%, respectively, of the total number of shares outstanding before
      and after this offering.

   .  537,510 shares held by APA Excelsior IV/Offshore, L.P., which
      represents 2.1% and 1.7%, respectively, of the total number of shares
      outstanding before and after this offering.

   .  60,422 shares held by Patricof Private Investment Club, L.P., which
      represents less than 1% of the total number of shares outstanding both
      before and after this offering.

  Patricia M. Cloherty is a special limited partner of APA Excelsior IV,
  L.P., The P/A Fund, L.P., APA Excelsior IV/Offshore, L.P. and Patricof
  Private Investment Club, L.P., and shares investment and voting power over
  these shares with the other managing members or general partners of the
  funds, none of whom are affiliated with us. Ms. Cloherty disclaims
  beneficial ownership of such shares except to the extent of her pecuniary
  interest therein.

 (4) Mark Leschly is a managing director of Rho Management Company, Inc.,
     financial advisor to Rho Management Trust II. Mr. Leschly disclaims
     beneficial ownership of the shares held by Rho Management Trust II except
     to the extent of his pecuniary interest therein.

                                       61
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

   Upon the closing of this offering, our authorized capital stock, after
giving effect to the conversion of all outstanding preferred stock into common
stock, will consist of 65,000,000 shares of common stock, $0.001 par value, and
5,000,000 shares of preferred stock, $0.001 par value.

   The following is a summary of various provisions of our common stock,
preferred stock, amended and restated certificate of incorporation and bylaws.

COMMON STOCK

   As of December 31, 1999, there were 2,945,390 shares of common stock
outstanding, held by approximately 115 stockholders of record. An additional
22,834,011 shares of our common stock will be issued upon conversion of all
outstanding shares of the preferred stock on the closing of this offering and
an estimated 32,000 shares will be issued related to dividends payable to the
holders of our series A, B and D preferred stock for the period between
December 21, 1999 and the completion of this offering. All outstanding shares
of common stock are, and the common stock to be issued in this offering will
be, fully paid and nonassessable.

   The following summarizes the rights of holders of our common stock:

  .  Each holder of shares of common stock is entitled to one vote per share
     on all matters to be voted on by stockholders generally, including the
     election of directors;

  .  There are no cumulative voting rights;

  .  The holders of our common stock are entitled to dividends and other
     distributions as may be declared from time to time by the board of
     directors out of funds legally available for that purpose, if any;

  .  Upon our liquidation, dissolution or winding up, the holders of shares
     of common stock will be entitled to share ratably in the distribution of
     all of our assets remaining available for distribution after
     satisfaction of all our liabilities and the payment of the liquidation
     preference of any outstanding preferred stock; and

  .  The holders of commons stock have no preemptive or other subscription
     rights to purchase shares of our stock, nor are they entitled to the
     benefits of any redemption or sinking fund provisions.

PREFERRED STOCK

   Upon the closing of this offering, there will be no shares of preferred
stock outstanding. Our certificate of incorporation authorizes our board of
directors to create and issue one or more series of preferred stock and
determine the rights and preferences of each series within the limits set forth
in our certificate of incorporation and applicable law. Among other rights, the
board of directors may determine, without further vote or action by our
stockholders:

  .  The number of shares constituting the series and the distinctive
     designation of the series;

  .  The dividend rate on the shares of the series, whether dividends will be
     cumulative, and if so, from which date or dates, and the relative rights
     of priority, if any, of payment of dividends on shares of the series;

  .  Whether the series will have voting rights in addition to the voting
     rights provided by law, and if so, the terms of the voting rights;

  .  Whether the series will have conversion privileges and, if so, the terms
     and conditions of conversion;

  .  Whether or not the shares of the series will be redeemable or
     exchangeable, and, if so, the dates, terms and conditions of redemption
     or exchange, as the case may be;

  .  Whether the series will have a sinking fund for the redemption or
     purchase of shares of that series, and, if so, the terms and amount of
     the sinking fund; and

                                       62
<PAGE>

  .  The rights of the shares of the series in the event of our voluntary or
     involuntary liquidation, dissolution or winding up and the relative
     rights or priority, if any, of payment of shares of the series.

   Unless otherwise provided by our board of directors, the shares of all
series of preferred stock will rank on a parity with respect to the payment of
dividends and to the distribution of assets upon liquidation. Although we have
no present plans to issue any shares of preferred stock, any future issuance of
shares of preferred stock, or the issuance of rights to purchase preferred
shares, may have the effect of delaying, deferring or preventing a change in
control in our company or an unsolicited acquisition proposal. The issuance of
preferred stock also could decrease the amount of earnings and assets available
for distribution to the holders of common stock or could adversely affect the
rights and powers, including voting rights, of the holders of the common stock.

REGISTRATION RIGHTS

   The holders of the 22,866,011 outstanding shares of our common stock which
will be issued upon conversion of the preferred stock on the closing of this
offering, which are referred to below as our preferred investors, have the
right to cause us to register their shares under the Securities Act as follows:

  .  DEMAND REGISTRATION RIGHTS: Each class of our preferred investors,
     excluding the holders of the series E preferred stock, may make one
     demand for registration by providing a written demand from the holders
     of at least 50% of the shares of common stock issued upon conversion of
     such class of preferred stock demanding registration. All of our
     preferred investors, including the holders of the series E preferred
     stock, acting as a single class may make two demands for registration by
     providing, in each instance, a written demand from the holders of at
     least 50% of the shares of common stock issued upon conversion of all of
     the preferred stock. We must use our best efforts to effect such
     registration as soon as possible after receipt of notice.

  .  PIGGYBACK REGISTRATION RIGHTS: Our preferred investors can request to
     have their shares registered any time we file a registration statement
     to register any of our securities for our own account. Such registration
     opportunities are unlimited but the number of shares that can be
     registered may be eliminated entirely or cut back by the underwriters.

  .  S-3 REGISTRATION RIGHTS: After we have qualified for registration on
     Form S-3, our preferred investors can request us to register their
     shares if the aggregate price of the shares to the public is not less
     than $500,000. Except for former holders of our series E preferred stock
     who are limited to only three such registrations, such registration
     opportunities are unlimited. However, we are not obligated to register
     the shares of any single stockholder on Form S-3 more than once during
     any single calendar year.

   We are required to bear substantially all costs incurred in connection with
any such registrations, other than underwriting discounts and commissions. The
foregoing registration rights could result in substantial future expenses for
us and adversely affect any future equity or debt offerings.

POSSIBLE ANTI-TAKEOVER MATTERS

   Certificate of Incorporation and Bylaws

   Our certificate of incorporation authorizes our board of directors to
establish one or more series of undesignated preferred stock, the terms of
which can be determined by the board of directors at the time of issuance. See
"--Preferred Stock" for a description of our preferred stock. Our certificate
of incorporation also provides that all stockholder action must be effected at
a duly called meeting of stockholders and not by a consent in writing. Our
bylaws provide that our board of directors will be classified into three
classes of directors. Please see "Management--Classified Board" for a list of
our directors and the class to which they belong. Our bylaws also require that
stockholders give advance notice to our secretary of any nominations for
director or other business to be brought by stockholders at any stockholders'
meeting and require a

                                       63
<PAGE>

supermajority vote of members of our board of directors and/or stockholders to
amend some bylaw provisions. These provisions of our certificate of
incorporation and our bylaws could discourage potential acquisition proposals
and could delay or prevent a change in control. Such provisions may also have
the effect of preventing changes in our management.

   Delaware Anti-Takeover Statute

   We are subject to Section 203 of the Delaware General Corporation Law which,
subject to specified exceptions, prohibits a Delaware corporation from engaging
in any business combination with any interested stockholder--defined as any
person or entity that is the beneficial owner of at least 15% of a
corporation's voting stock--for a period of three years following the time that
such stockholder became an interested stockholder, unless:

  .  Prior to that time, the corporation's board of directors approved either
     the business combination or the transaction that resulted in the
     stockholder becoming an interested stockholder;

  .  Upon consummation of the transaction that resulted in the stockholder
     becoming an interested stockholder, the interested stockholder owned at
     least 85% of the corporation's voting stock outstanding at the time the
     transaction commenced, excluding, for purposes of determining the number
     of shares outstanding, those shares owned by persons who are directors
     and also officers and by employee stock plans in which employee
     participants do not have the right to determine confidentially whether
     shares held subject to the plan will be tendered in a tender or exchange
     offer; and

  .  At or subsequent to such time, the business combination is approved by
     the corporation's board of directors and authorized at an annual or
     special meeting of stockholders, and not by written consent, by the
     affirmative vote of at least two-thirds of the outstanding voting stock
     that is not owned by the interested stockholder.

   Section 203 defines business combination to include:

  .  Any merger or consolidation involving the corporation and the interested
     stockholder;

  .  Any sale, lease, exchange, mortgage, transfer, pledge or other
     disposition involving the interested stockholder and 10% or more of the
     assets of the corporation;

  .  Subject to specified exceptions, any transaction which results in the
     issuance or transfer by the corporation of any stock of the corporation
     to the interested stockholder;

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

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

NASDAQ NATIONAL MARKET

   We have applied to list our common stock on the Nasdaq National Market under
the trading symbol "DVSA."

TRANSFER AGENT AND REGISTRAR

   The stock transfer agent and registrar for our common stock is American
Stock Transfer & Trust Company.

                                       64
<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

   Future sales of substantial amounts of our common stock in the public market
could adversely affect the market price of our common stock. Furthermore, since
only a limited number of shares will be available for sale shortly after this
offering because of contractual and legal restrictions on resale described
below, sales of substantial amounts of common stock in the public market after
the restrictions lapse could adversely affect the prevailing market price and
our ability to raise equity capital in the future.

   Upon completion of this offering, we will have outstanding 32,811,401 shares
of common stock, assuming no exercise of the underwriters' over-allotment
option. Of these shares, the 7,000,000 shares sold in this offering will
generally be freely tradable without restriction or further registration under
the Securities Act. Of the remaining 25,811,401 shares, all may be sold in the
public market upon expiration of lock-up agreements 180 days after the date
this prospectus is declared effective, subject to the volume and other
restrictions of Rule 144.

   In general, under Rule 144 as currently in effect, our affiliates and other
stockholders who have beneficially owned restricted shares for at least one
year will be entitled to sell in any three-month period a number of shares that
does not exceed the greater of:

  .  1% of the then outstanding shares of our common stock; or

  .  The average weekly trading volume of our common stock on the Nasdaq
     National Market during the four calendar weeks immediately preceding the
     date on which notice of the sale is filed with the SEC.

   Sales pursuant to Rule 144 are subject to requirements relating to manner of
sale, notice, and the availability of current public information about us. A
stockholder who is not deemed to have been an affiliate of ours at any time
during the 90 days immediately preceding the sale and who has beneficially
owned restricted shares for at least two years is entitled to sell those shares
under Rule 144(k) without regard to the limitations described above.

   Subject to limitations on the aggregate offering price of a transaction and
other conditions, Rule 701 of the Securities Act, as currently in effect, may
be relied upon with respect to the resales of securities originally purchased
from us by our employees, directors, officers, consultants or advisors prior to
the date we become subject to the reporting requirements of the Securities
Exchange Act, pursuant to written compensatory benefit plans or written
contracts relating to the compensation of those persons. In addition, the SEC
has indicated that Rule 701 will apply to typical stock options granted by an
issuer before it becomes subject to the reporting requirements of the Exchange
Act, along with the shares acquired upon exercise of such options, including
exercises after the date of this prospectus. Securities issued in reliance on
Rule 701 are restricted securities and, subject to the contractual restrictions
described above, beginning 90 days after the date of this prospectus, may be
sold by persons other than affiliates subject only to the manner of sale
provisions of Rule 144 and by affiliates under Rule 144 without compliance with
its minimum holding period requirements.

   Shortly after this offering, we may also file a registration statement under
the Securities Act covering shares of common stock reserved for issuance under
our equity incentive plans. Such registration statement will cover
approximately 6,187,096 shares. Shares registered under this registration
statement will, subject to Rule 144 volume limitations applicable to
affiliates, be available for sale in the open market, unless such shares are
subject to the lock-up agreements described above.

                                       65
<PAGE>

                                  UNDERWRITING

   Subject to the terms and conditions set forth in an agreement among the
underwriters and us, each of the underwriters named below, through their
representatives, Bear, Stearns & Co. Inc., Chase Securities Inc. and Deutsche
Bank Securities Inc. has severally agreed to purchase from us the aggregate
number of shares of our common stock set forth opposite its name below:

<TABLE>
<CAPTION>
                                                                       NUMBER
    UNDERWRITER                                                       OF SHARES
    -----------                                                      -----------
<S>                                                                  <C>
Bear, Stearns & Co. Inc. ...........................................
Chase Securities Inc. ..............................................
Deutsche Bank Securities Inc. ......................................
                                                                     -----------
    Total...........................................................   7,000,000
                                                                     ===========
</TABLE>

   The underwriting agreement provides that the obligations of the several
underwriters are subject to approval of various legal matters by their counsel
and to various other conditions, including delivery of legal opinions by our
counsel, the delivery of a letter by our independent auditors and the accuracy
of the representations and warranties made by us in the underwriting agreement.
Under the underwriting agreement, the underwriters are obliged to purchase and
pay for all of the above shares of our common stock if any are purchased.

PUBLIC OFFERING PRICE

   The underwriters propose to offer the shares of common stock directly to the
public at the offering price set forth on the cover page of this prospectus and
at that price less a concession not in excess of $         per share of common
stock to other dealers who are members of the National Association of
Securities Dealers, Inc. The underwriters may allow, and those dealers may
reallow, concessions not in excess of $         per share of common stock to
other dealers. After this offering, the offering price, concessions and other
selling terms may be changed by the underwriters. Our common stock is offered
subject to receipt and acceptance by the underwriters and subject to other
conditions, including the right to reject orders in whole or in part. The
underwriters have informed us that the underwriters do not expect to confirm
sales of common stock to any accounts over which they exercise discretionary
authority.

   The following table summarizes the per share and total public offering price
of the shares of common stock in the offering, the underwriting compensation to
be paid to the underwriters by us and the proceeds of the offering, before
expenses, to us. The information presented assumes either no exercise or full
exercise by the underwriters of their over-allotment option.

<TABLE>
<CAPTION>
                                                               TOTAL
                                                     -------------------------
                                                       WITHOUT        WITH
                                                        OVER-        OVER-
                                           PER SHARE  ALLOTMENT    ALLOTMENT
                                           --------- ------------ ------------
<S>                                        <C>       <C>          <C>
Public offering price..................... $         $            $
Underwriting discounts and commissions
 payable by us............................
Proceeds, before expenses, to us..........
</TABLE>

   The underwriting discount and commission per share is equal to the public
offering price per share of our common stock less the amount paid by the
underwriters to us per share of common stock.

   We estimate total expenses payable by us in connection with this offering,
other than the underwriting discounts and commissions referred to above, will
be approximately $1.2 million.

                                       66
<PAGE>

OVER-ALLOTMENT OPTION TO PURCHASE ADDITIONAL SHARES

   We have granted a 30-day over-allotment option to the underwriters to
purchase up to an aggregate of 1,050,000 additional shares of our common stock
exercisable at the offering price less the underwriting discounts and
commissions, each as set forth on the cover page of this prospectus. If the
underwriters exercise this option in whole or in part, then each of the
underwriters will be obligated to purchase additional shares of common stock in
proportion to their respective purchase commitments as shown in the table set
forth above, subject to various conditions.

INDEMNIFICATION AND CONTRIBUTION

   The underwriting agreement provides that we will indemnify the underwriters
against liabilities specified in the underwriting agreement under the
Securities Act or will contribute to payments that the underwriters may be
required to make in respect of those liabilities.

LOCK-UP AGREEMENTS

   Our directors and officers and stockholders holding 25,594,411 shares have
agreed that they will not offer, sell or agree to sell, directly or indirectly,
or otherwise dispose of any shares of common stock in the public market without
the prior written consent of Bear, Stearns & Co. Inc. for a period of 180 days
from the date of this prospectus.

   In addition, we have agreed that for a period of 180 days from the date of
this prospectus, we will not, without the prior written consent of Bear,
Stearns & Co. Inc., offer, sell or otherwise dispose of any shares of common
stock, except that we may issue, and grant options to purchase, shares of
common stock under our stock option plans and employee stock purchase plan and
shares issuable upon exercise of outstanding options granted outside our plans.
During this lock-up period, subject to various conditions, we may also issue
additional equity securities in connection with collaborative and licensing
arrangements or to pay for possible acquisitions, so long as the recipients of
such securities are also subject to the 180 day lock-up period.

NASDAQ NATIONAL MARKET QUOTATION

   Prior to this offering, there has been no public market for our common
stock. Consequently, the initial offering price for the common stock will be
determined by negotiations between us and the representatives of the
underwriters. Among the factors to be considered in those negotiations, the
primary factors will be our results of operations in recent periods, estimates
of our prospects and the industry in which we compete, an assessment of our
management, the general state of the securities markets at the time of this
offering and the prices of similar securities of generally comparable
companies. We have applied for approval for the quotation of our common stock
on the Nasdaq National Market, under the symbol "DVSA." We cannot assure you,
however, that an active or orderly trading market will develop for the common
stock or that the common stock will trade in the public market subsequent to
this offering at or above the initial offering price.

STABILIZATION, SYNDICATE SHORT POSITION AND PENALTY BIDS

   In order to facilitate this offering, persons participating in this offering
may engage in transactions that stabilize, maintain or otherwise affect the
price of the common stock during and after this offering. Specifically, the
underwriters may over-allot or otherwise create a short position in the common
stock for their own account by selling more shares of common stock than we have
actually sold to them. The underwriters may elect to cover any such short
position by purchasing shares of common stock in the open market and may impose
penalty bids, under which selling concessions allowed to syndicate members or
other broker-dealers participating in this offering are reclaimed if shares of
common stock previously distributed in this offering are repurchased in
connection with stabilization transactions or otherwise. The effect of these
transactions may be to stabilize or maintain the market price at a level above
that which might otherwise prevail in the open market. The imposition of a
penalty bid may also affect the price of the common stock to the extent that it
discourages resales thereof. No representation is made as to the magnitude or
effect of any such stabilization or other transactions. Such transactions may
be effected on the Nasdaq National Market or otherwise and, if commenced, may
be discontinued at any time.

                                       67
<PAGE>

RESERVED SHARE PROGRAM

   At our request, the underwriters have reserved for sale at the initial
public offering price up to 400,000 shares of common stock to be sold in this
offering for sale to our directors, officers, employees, business associates,
vendors and related persons. Purchases of reserved shares are to be made
through an account at Bear, Stearns & Co. Inc. in accordance with Bear, Stearns
& Co. Inc.'s procedures for opening an account and transacting in securities.
The number of shares available for sale to the general public will be reduced
to the extent that any reserved shares are purchased. Any reserved shares not
purchased by our directors, officers, employees, business associates, vendors
and related persons will be offered by the underwriters to the general public
on the same terms as the other shares offered by this prospectus.

                                 LEGAL MATTERS

   Cooley Godward llp, San Diego, California will pass on the validity of the
shares of common stock offered by this prospectus for us and certain other
legal matters. Upon the completion of this offering, attorneys with Cooley
Godward llp, through an investment partnership, will beneficially own a total
of 12,252 shares of our common stock.

   Brobeck, Phleger & Harrison LLP, San Diego, California will pass on legal
matters in connection with this offering for the underwriters.

                                    EXPERTS

   The audited financial statements included in this prospectus have been
audited by Ernst & Young LLP, independent auditors, as described in their
report. We have included our financial statements in this prospectus in
reliance upon Ernst & Young LLP's report, given on their authority as experts
in accounting and auditing.

                    CHANGE IN INDEPENDENT PUBLIC ACCOUNTANTS

   In August 1999, we dismissed PricewaterhouseCoopers LLP as our independent
accountants. The former independent accountants' report did not contain an
adverse opinion, a disclaimer of opinion or any qualifications or modifications
related to uncertainty, limitation of audit scope or application of accounting
principles. The former independent accountants' report does not cover any of
our financial statements in this registration statement. There were no
disagreements with the former public accountants on any matter of accounting
principles or practices, financial statement disclosure or auditing scope or
procedure with respect to our financial statements up through the time of
dismissal that, if not resolved to the former accountants' satisfaction, would
have caused them to make reference to the subject matter of the disagreement in
connection with their report. In August 1999, we retained Ernst & Young LLP as
our independent public accountants. The decision to retain Ernst & Young LLP
was approved by resolution of the audit committee of the board of directors.
Prior to retaining Ernst & Young LLP, we had not consulted with Ernst & Young
LLP regarding accounting principles.

                                       68
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

   We have filed with the Securities and Exchange Commission, Washington, D.C.,
a registration statement on Form S-1 under the Securities Act, with respect to
the common stock offered by this prospectus. This prospectus does not contain
all of the information set forth in the registration statement and the exhibits
and schedules to the registration statement. For further information with
respect to us and our common stock, reference is made to the registration
statement and the exhibits and schedules filed as part of the registration
statement. Statements contained in this prospectus as to the contents of any
contract or document filed as an exhibit to the registration statement are
qualified by reference to the applicable exhibit as filed.

   A copy of the registration statement, and the exhibits and schedules to the
registration statement, as well as reports and other information filed by us
with the SEC may be inspected without charge at the public reference facilities
maintained by the SEC in Room 1024, 450 Fifth Street, N.W., Washington, D.C.
20549, and at the SEC's regional offices located at the Northwestern Atrium
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and Seven
World Trade Center, 13th Floor, New York, New York 10048, and copies of all or
any part of the registration statement may be obtained from those offices upon
the payment of the fees prescribed by the SEC. You can obtain information about
the operation of the public reference facilities by calling the SEC at 1-800-
SEC-0330. In addition, registration statements and other filings we make with
the SEC through its electronic data gathering, analysis and retrieval, or
EDGAR, system, including our registration statement, are publicly available
through the Internet. The SEC maintains a web site that contains reports, proxy
and information statements and other information regarding registrants that
file electronically with the SEC. The SEC's web site is http://www.sec.gov.

   As a result of this offering, we will become subject to the information and
reporting requirements of the Exchange Act and, in accordance with the Exchange
Act, will file periodic reports, proxy statements and other information with
the SEC.

                                       69
<PAGE>

                              DIVERSA CORPORATION

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Report of Ernst & Young LLP, Independent Auditors.......................   F-2

Balance Sheets as of December 31, 1998 and 1999.........................   F-3

Statements of Operations for the years ended December 31, 1997, 1998 and
 1999...................................................................   F-4

Statement of Stockholders' Deficit for the years ended December 31,
 1997, 1998 and 1999....................................................   F-5

Statements of Cash Flows for the years ended December 31, 1997, 1998 and
 1999...................................................................   F-6

Notes to Financial Statements...........................................   F-7
</TABLE>

                                      F-1
<PAGE>

               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders
Diversa Corporation

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

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

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

                                          ERNST & YOUNG LLP

San Diego, California
January 12, 2000, except for Note 11, as to which the
   date is February 8, 2000.

                                      F-2
<PAGE>

                              DIVERSA CORPORATION

                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                    PRO FORMA
                                                                  STOCKHOLDERS'
                                            DECEMBER 31,          EQUITY AS OF
                                      --------------------------  DECEMBER 31,
                                          1998          1999          1999
                                      ------------  ------------  -------------
                                                                   (UNAUDITED)
<S>                                   <C>           <C>           <C>
ASSETS
Current assets:
  Cash and cash equivalents.......... $  4,473,000  $  2,490,000
  Short-term investments.............    1,079,000     2,594,000
  Accounts receivable, net of
   allowance of $6,000 and $1,000 at
   December 31, 1998 and 1999,
   respectively......................       48,000    15,571,000
  Other current assets...............      410,000       659,000
                                      ------------  ------------
    Total current assets.............    6,010,000    21,314,000
Property and equipment, net..........    2,622,000     3,096,000
Acquired technology rights, net......           --     2,487,000
Other assets.........................       74,000     4,175,000
                                      ------------  ------------
Total assets......................... $  8,706,000  $ 31,072,000
                                      ============  ============
LIABILITIES AND STOCKHOLDERS' EQUITY
 (DEFICIT)
Current liabilities:
  Accounts payable................... $    235,000  $    668,000
  Accrued liabilities................    1,530,000     1,653,000
  Deferred revenue...................      301,000     4,491,000
  Notes payable......................      552,000            --
  Current portion of capital lease
   obligations.......................      922,000       600,000
                                      ------------  ------------
    Total current liabilities........    3,540,000     7,412,000
                                      ------------  ------------

Capital lease obligations, less
 current portion.....................    2,202,000     2,677,000
Deposit from sublessee...............      300,000       300,000
Long-term deferred revenue...........           --    15,094,000

Commitments and contingencies (Note
 7)

Redeemable Convertible Preferred
   Stock--$0.001 par value;
   60,718,183 shares authorized,
   60,220,183 shares issued and
   outstanding at December 31, 1998
   and 1999; no shares issued and
   outstanding pro forma.............   48,402,000    48,402,000  $         --

Stockholders' equity (deficit):
 Series E Convertible Preferred
  Stock--$0.001 par value; 5,555,556
  shares authorized, issued and
  outstanding at December 31, 1999;
  5,000,000 shares authorized, no
  shares issued and outstanding
  pro forma..........................           --         6,000            --
 Common stock--$0.001 par value;
  28,630,349 shares authorized,
  1,856,343 and 2,945,390 shares
  issued and outstanding at December
  31, 1998 and 1999, respectively;
  65,000,000 shares authorized,
  25,779,401 shares issued and
  outstanding pro forma..............        2,000         3,000        26,000
 Additional paid-in capital..........    4,309,000    20,102,000    68,487,000
 Deferred compensation...............   (1,692,000)   (5,520,000)   (5,520,000)
 Notes receivable from stockholders..      (93,000)      (36,000)      (36,000)
 Accumulated deficit.................  (48,266,000)  (57,351,000)  (57,351,000)
 Accumulated other comprehensive
  income (loss)......................        2,000       (17,000)      (17,000)
                                      ------------  ------------  ------------
    Total stockholders' equity
     (deficit).......................  (45,738,000)  (42,813,000) $  5,589,000
                                      ------------  ============  ============
    Total liabilities and
     stockholders' equity (deficit).. $  8,706,000  $ 31,072,000
                                      ============  ============
</TABLE>

                            See accompanying notes.

                                      F-3
<PAGE>

                              DIVERSA CORPORATION

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                             YEARS ENDED DECEMBER 31,
                                       ---------------------------------------
                                           1997          1998         1999
                                       ------------  ------------  -----------
<S>                                    <C>           <C>           <C>
Revenue:
  Collaborative revenue..............  $    669,000  $    625,000  $ 9,166,000
  Grant and product revenue..........       486,000       722,000    1,106,000
                                       ------------  ------------  -----------
Total revenue........................     1,155,000     1,347,000   10,272,000
Operating expenses:
  Research and development...........     8,195,000    10,665,000   12,149,000
  Selling, general and
   administrative....................     5,260,000     4,536,000    7,357,000
                                       ------------  ------------  -----------
Total operating expenses.............    13,455,000    15,201,000   19,506,000
                                       ------------  ------------  -----------
Loss from operations.................   (12,300,000)  (13,854,000)  (9,234,000)
Other income (expense)...............       (25,000)       99,000       79,000
Interest income......................       288,000       553,000      527,000
Interest expense.....................      (355,000)     (308,000)    (391,000)
                                       ------------  ------------  -----------
Net loss.............................   (12,392,000)  (13,510,000)  (9,019,000)
Dividends payable to preferred
 stockholders........................            --            --      (66,000)
                                       ------------  ------------  -----------
Net loss applicable to common
 stockholders........................  $(12,392,000) $(13,510,000) $(9,085,000)
                                       ============  ============  ===========
Historical net loss per share, basic
 and diluted.........................  $      (7.72) $      (7.64) $     (3.86)
                                       ============  ============  ===========
Shares used in calculating historical
 net loss per share, basic and
 diluted.............................     1,606,000     1,768,000    2,353,000
Pro forma net loss per share.........                              $     (0.36)
                                                                   ===========
Shares used in calculating pro forma
 net loss per share..................                               25,187,000
</TABLE>


                            See accompanying notes.

                                      F-4
<PAGE>

                              DIVERSA CORPORATION

                      STATEMENT OF STOCKHOLDERS' DEFICIT

<TABLE>
<CAPTION>
                      SERIES E
                    CONVERTIBLE                                                        NOTES                     ACCUMULATED
                  PREFERRED STOCK      COMMON STOCK     ADDITIONAL                   RECEIVABLE                     OTHER
                  -----------------  -----------------    PAID-IN      DEFERRED         FROM     ACCUMULATED    COMPREHENSIVE
                   SHARES    AMOUNT   SHARES    AMOUNT    CAPITAL    COMPENSATION   STOCKHOLDERS   DEFICIT      INCOME (LOSS)
                  ---------  ------  ---------  ------  -----------  ------------   ------------ ------------   -------------
<S>               <C>        <C>     <C>        <C>     <C>          <C>            <C>          <C>            <C>
Balance at
 December 31,
 1996...........         --   $  --  1,576,978  $2,000  $   190,000  $        --      $ (50,000) $(22,298,000)    $     --
Issuance of
 notes
 receivable from
 stockholders
 related to sale
 of preferred
 stock .........         --      --         --      --           --           --       (113,000)           --           --
Stock options
 exercised......         --      --     50,847      --       18,000           --             --            --           --
Dividends.......         --      --         --      --           --           --             --       (66,000)          --
Net loss and
 comprehensive
 loss...........         --      --         --      --           --           --             --   (12,392,000)          --
Deferred
 compensation
 related to
 stock options..         --      --         --      --    2,113,000   (2,113,000)            --            --           --
Amortization of
 deferred
 compensation...         --      --         --      --           --      685,000             --            --           --
                  ---------  ------  ---------  ------  -----------  -----------     ----------  ------------     --------
Balance at
 December 31,
 1997...........         --      --  1,627,825   2,000    2,321,000   (1,428,000)      (163,000)  (34,756,000)          --
Comprehensive
 income (loss):
Net loss........         --      --         --      --           --           --             --   (13,510,000)          --
Unrealized gain
 on available-
 for-sale
 securities.....         --      --         --      --           --           --             --            --        2,000
Comprehensive
 loss...........         --      --         --      --           --           --             --            --           --
Stock options
 exercised......         --      --    228,518      --       59,000           --             --            --           --
Payments
 received on
 notes
 receivable.....         --      --         --      --           --           --         70,000            --           --
Deferred
 compensation
 related to
 stock options..         --      --         --      --    1,929,000   (1,929,000)            --            --           --
Amortization of
 deferred
 compensation...         --      --         --      --           --    1,665,000             --            --           --
                  ---------  ------  ---------  ------  -----------  -----------     ----------  ------------     --------
Balance at
 December 31,
 1998...........         --      --  1,856,343   2,000    4,309,000   (1,692,000)       (93,000)  (48,266,000)       2,000
Comprehensive
 income (loss):
Net loss........         --      --         --      --           --           --             --    (9,019,000)          --
Unrealized loss
 on available-
 for-sale
 securities.....         --      --         --      --           --           --             --            --      (19,000)
Comprehensive
 loss...........         --      --         --      --           --           --             --            --           --
Issuance of
 preferred
 stock, net of
 issuance costs
 of $71,000.....  5,555,556   6,000         --      --    7,248,000           --             --            --           --
Issuance of
 stock options
 to former
 employee as
 part of
 severance
 agreement......         --      --         --      --    1,095,000           --             --            --           --
Stock options
 exercised......         --      --  1,089,047   1,000      607,000           --             --            --           --
Payment of note
 receivable from
 stockholders...         --      --         --      --           --           --         13,000            --           --
Forgiveness of
 notes
 receivable
 related to
 employee
 terminations...         --      --         --      --           --           --         44,000            --           --
Dividends
 payable to
 preferred
 stockholders...         --      --         --      --           --           --             --      (66,000)           --
Deferred
 compensation
 related to
 stock options..         --      --         --      --    6,843,000   (6,843,000)            --            --           --
Amortization of
 deferred
 compensation...         --      --         --      --           --    3,015,000             --            --           --
                  ---------  ------  ---------  ------  -----------  -----------     ----------  ------------     --------
Balance at
 December 31,
 1999...........  5,555,556  $6,000  2,945,390  $3,000  $20,102,000  $(5,520,000)    $  (36,000) $(57,351,000)    $(17,000)
                  =========  ======  =========  ======  ===========  ===========     ==========  ============     ========
<CAPTION>
                      TOTAL
                  STOCKHOLDERS'
                     DEFICIT
                  --------------
<S>               <C>
Balance at
 December 31,
 1996...........  $(22,156,000)
Issuance of
 notes
 receivable from
 stockholders
 related to sale
 of preferred
 stock .........      (113,000)
Stock options
 exercised......        18,000
Dividends.......       (66,000)
Net loss and
 comprehensive
 loss...........   (12,392,000)
Deferred
 compensation
 related to
 stock options..            --
Amortization of
 deferred
 compensation...       685,000
                  --------------
Balance at
 December 31,
 1997...........   (34,024,000)
Comprehensive
 income (loss):
Net loss........   (13,510,000)
Unrealized gain
 on available-
 for-sale
 securities.....         2,000
                  --------------
Comprehensive
 loss...........   (13,508,000)
Stock options
 exercised......        59,000
Payments
 received on
 notes
 receivable.....        70,000
Deferred
 compensation
 related to
 stock options..            --
Amortization of
 deferred
 compensation...     1,665,000
                  --------------
Balance at
 December 31,
 1998...........   (45,738,000)
Comprehensive
 income (loss):
Net loss........    (9,019,000)
Unrealized loss
 on available-
 for-sale
 securities.....       (19,000)
                  --------------
Comprehensive
 loss...........    (9,038,000)
Issuance of
 preferred
 stock, net of
 issuance costs
 of $71,000.....     7,254,000
Issuance of
 stock options
 to former
 employee as
 part of
 severance
 agreement......     1,095,000
Stock options
 exercised......       608,000
Payment of note
 receivable from
 stockholders...        13,000
Forgiveness of
 notes
 receivable
 related to
 employee
 terminations...        44,000
Dividends
 payable to
 preferred
 stockholders...       (66,000)
Deferred
 compensation
 related to
 stock options..            --
Amortization of
 deferred
 compensation...     3,015,000
                  --------------
Balance at
 December 31,
 1999...........  $(42,813,000)
                  ==============
</TABLE>

                                      F-5
<PAGE>

                              DIVERSA CORPORATION

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                              YEARS ENDED DECEMBER 31,
                                        ---------------------------------------
                                            1997          1998         1999
                                        ------------  ------------  -----------
<S>                                     <C>           <C>           <C>
Operating activities:
 Net loss applicable to common
  stockholders........................  $(12,392,000) $(13,510,000) $(9,085,000)
 Adjustments to reconcile net loss to
  net cash used in operating
  activities:
  Depreciation and amortization.......       842,000     1,178,000    1,498,000
  Loss on disposal of property and
   equipment..........................        86,000            --           --
  Dividends payable to Series A, B and
   D preferred stockholders...........            --            --       66,000
  Amortization of deferred
   compensation.......................       685,000     1,665,000    3,015,000
  Issuance of stock options to former
   employees..........................            --            --    1,095,000
  Forgiveness of notes receivable.....            --            --       44,000
  Change in operating assets and
   liabilities:
  Accounts receivable, net............       (61,000)      233,000     (664,000)
  Other current assets................       (64,000)     (137,000)    (609,000)
  Other assets........................        48,000        78,000      (47,000)
  Accounts payable....................       (10,000)     (294,000)     433,000
  Accrued liabilities.................      (312,000)     (335,000)     123,000
  Deferred revenue....................            --       301,000       81,000
                                        ------------  ------------  -----------
  Net cash used in operating
   activities.........................   (11,178,000)  (10,821,000)  (4,050,000)
Investing activities:
 Purchases of property and equipment..    (1,310,000)   (1,234,000)  (1,421,000)
 Purchase of acquired technology
  rights..............................            --            --   (2,500,000)
 Proceeds from release of restricted
  investment securities...............       263,000       405,000           --
 Purchases of investments.............            --   (21,710,000) (26,943,000)
 Maturities of investments............            --    20,633,000   25,426,000
 Deposit from sublessee...............       300,000            --           --
                                        ------------  ------------  -----------
  Net cash used in investing
   activities.........................      (747,000)   (1,906,000)  (5,438,000)
Financing activities:
 Advances under capital lease
  obligations.........................     1,024,000     1,624,000    1,075,000
 Principal payments on capital
  leases..............................      (978,000)   (1,146,000)    (922,000)
 Proceeds from repayment of notes
  receivable from stockholders........     1,402,000        70,000       13,000
 Payments on long-term debt/note
  payable.............................       (15,000)      (14,000)    (552,000)
 Proceeds from sales of preferred and
  common stock, net of issuance
  costs...............................    22,125,000        59,000    7,891,000
 Payments of preferred stock
  dividends...........................       (66,000)           --           --
                                        ------------  ------------  -----------
  Net cash provided by financing
   activities.........................    23,492,000       593,000    7,505,000
                                        ------------  ------------  -----------
Net (decrease) increase in cash and
 cash equivalents.....................    11,567,000   (12,134,000)  (1,983,000)
Cash and cash equivalents at beginning
 of period............................     5,040,000    16,607,000    4,473,000
                                        ------------  ------------  -----------
Cash and cash equivalents at end of
 period...............................  $ 16,607,000  $  4,473,000  $ 2,490,000
                                        ============  ============  ===========
Supplemental disclosure of cash flow
 information:
 Interest paid........................  $    363,000  $    368,000  $   451,000
                                        ============  ============  ===========
Supplemental schedule of noncash
 activities:
 Conversion of bridge notes to
  preferred stock.....................  $  3,433,000  $         --  $        --
                                        ============  ============  ===========
 Conversion of Series I preferred
  stock to Series D preferred stock...  $    668,000  $         --  $        --
                                        ============  ============  ===========
</TABLE>

                            See accompanying notes.

                                      F-6
<PAGE>

                              DIVERSA CORPORATION

                         NOTES TO FINANCIAL STATEMENTS

                               DECEMBER 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

   The Company

   Diversa Corporation (the "Company") was incorporated under the laws of the
State of Delaware on December 21, 1992 and received initial funding to commence
its operations in May 1994. The Company discovers and develops novel enzymes
and other biologically active compounds from diverse environmental sources for
use in agricultural, chemical processing, industrial and pharmaceutical
applications.

   Use of Estimates

   The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results could differ from those estimates.

   Cash and Cash Equivalents

   The Company considers cash equivalents to be only those investments which
are highly liquid, readily convertible to cash and which mature within three
months from the date of purchase. The Company generally invests its excess cash
in U.S. Government securities and investment grade corporate obligations.

   Short-term Investments

   The Company applies Statement of Financial Accounting Standards ("SFAS") No.
115, Accounting for Certain Investments in Debt and Equity Securities, to its
investments. Under SFAS No. 115, the Company classifies its short-term
investments as "Available-for-Sale" and records such assets at estimated fair
value in the balance sheet, with unrealized gains and losses, if any, reported
in stockholders' equity (deficit).

   At December 31, 1998, all short-term investments consisted of investments in
U.S. government treasury securities. At December 31, 1999, short-term
investments consisted of the following:

<TABLE>
<CAPTION>
                                                    AMORTIZED MARKET UNREALIZED
                                                      COST    VALUE  GAIN (LOSS)
                                                    --------- ------ -----------
<S>                                                 <C>       <C>    <C>
Corporate debt securities..........................  $1,505   $1,496    $ (9)
Obligations of U.S. Government agencies............   1,106    1,098      (8)
                                                     ------   ------    ----
                                                     $2,611   $2,594    $(17)
                                                     ======   ======    ====
</TABLE>

   These investments all mature in less than one year.

   Concentration of Credit Risk

   Financial instruments which potentially subject the Company to
concentrations of credit risk consist primarily of cash, cash equivalents and
short-term investments. The Company limits its exposure to credit loss by
placing its cash and investments with high credit quality financial
institutions.

   During the years ended December 31, 1997, 1998 and 1999, the Company had
collaborative research agreements that accounted for 58%, 46%, and 89%,
respectively, of total revenue.

   Property and Equipment

   Property and equipment are stated at cost and depreciated over the estimated
useful lives of the assets (generally three to five years) using the straight-
line method. Amortization of leasehold improvements is computed over the
shorter of the lease term or the estimated useful life of the related assets.

                                      F-7
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Impairment of Long-Lived Assets

   In accordance with SFAS No. 121, Accounting for the Impairment of Long-Lived
Assets and for Long-Lived Assets to be Disposed of, if indicators of impairment
exist, the Company assesses the recoverability of the affected long-lived
assets by determining whether the carrying value of such assets can be
recovered through undiscounted future operating cash flows. If impairment is
indicated, the Company measures the amount of such impairment by comparing the
carrying value of the asset to the present value of the expected future cash
flows associated with the use of the asset. While the Company's current and
historical operating and cash flow losses are indicators of impairment, the
Company believes the future cash flows to be received from the long-lived
assets will exceed the assets' carrying value, and accordingly the Company has
not recognized any impairment losses through December 31, 1999.

   Acquired Technology Rights

   In accordance with APB 17, Accounting for Intangible Assets, the acquired
technology rights are recorded at cost. The rights related to patents (Note 3)
and will be amortized over the remaining life of the patents (sixteen years.)
For purposes of evaluating impairment of the acquired technology rights, the
Company compares the carrying values and estimated future cash flows of both
the acquired rights and the Company's internally developed technology on a
combined basis.


   Fair Value of Financial Instruments

   Financial instruments, including cash and cash equivalents, accounts
receivable, accounts payable and accrued liabilities, are carried at cost,
which management believes approximates fair value because of the short-term
maturity of these instruments.

   Revenue Recognition

   Strategic alliance revenues are earned and recognized on a percentage of
completion basis as research costs are incurred in accordance with the
provisions of each strategic alliance agreement. Fees paid to initiate research
projects are deferred and amortized over the project period in accordance with
SEC Staff Accounting Bulletin (SAB) No. 101. Milestone payments are recognized
as revenue upon the completion of the milestone. Revenue from grants is
recognized on a percentage of completion basis as related costs are incurred.
Revenue from product sales is recognized at the time of shipment to the
customer. The Company recognizes revenue only on payments that are non
refundable, and defers revenue recognition until performance obligations have
been completed. None of the strategic alliances or grants require scientific
achievement as a performance obligation.

   Research and Development

   Expenditures relating to research and development are expensed in the period
incurred.

   Income Taxes

   Current income tax expense (benefit) is the amount of income taxes expected
to be payable (receivable) for the current year. A deferred income tax asset or
liability is computed for the expected future impact of differences between the
financial reporting and tax bases of assets and liabilities, as well as the
expected future tax benefit to be derived from tax loss and credit
carryforwards. Deferred income tax expense is generally the net change during
the year in the deferred income tax asset or liability. Valuation allowances
are established when realizability of deferred tax assets is uncertain. The
effect of tax rate changes is reflected in tax expense (benefit) during the
period in which such changes are enacted.

                                      F-8
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Stock-Based Compensation

   As permitted by SFAS No. 123, the Company accounts for common stock options
granted to employees using the intrinsic value method and, thus, recognizes no
compensation expense for options granted with exercise prices equal to or
greater than the fair value of the Company's common stock on the date of the
grant. In 1999, the Company recognized deferred stock compensation related to
certain stock option grants (see Note 5).

                                     F-8--1
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Deferred compensation for options granted to non-employees has been
determined in accordance with SFAS No. 123 and EITF 96-18 as the fair value of
the consideration received or the fair value of the equity instruments issued,
whichever is more reliably measured. Deferred charges for options granted to
non-employees are periodically remeasured as the underlying options vest.

   Comprehensive Income (Loss)

   As of January 1, 1998, the Company adopted SFAS No. 130, Reporting
Comprehensive Income. SFAS No. 130 establishes new rules for the reporting and
display of comprehensive income (loss) and its components; the Company has
disclosed its comprehensive income (loss) as a component of its statement of
stockholders' equity (deficit).

   Net Loss Per Share

   Basic and diluted net loss per common share are presented in conformity with
SFAS No. 128, Earnings per Share, and SAB 98, for all periods presented. Under
the provisions of SAB 98, common stock and convertible preferred stock that has
been issued or granted for nominal consideration prior to the anticipated
effective date of the initial public offering must be included in the
calculation of basic and diluted net loss per common share as if these shares
had been outstanding for all periods presented. To date, the Company has not
issued or granted shares for nominal consideration.

   In accordance with SFAS No. 128, basic and diluted net loss per share has
been computed using the weighted-average number of shares of common stock
outstanding during the period, less shares subject to repurchase. Pro forma
basic and diluted net loss per common share, as presented in the statements of
operations, has been computed for the year ended December 31, 1999 as described
above, and also gives effect to the assumed conversion of preferred stock which
will automatically convert to common stock immediately prior to the completion
of the Company's initial public offering (using the "as if converted" method)
from the original date of issuance. The pro forma shares have been adjusted to
give effect to the 1-for-2.8806 reverse stock split contemplated in Note 11.

   The following table presents the calculation of basic, diluted and pro forma
basic and diluted net loss per share:

<TABLE>
<CAPTION>
                                               YEAR ENDED DECEMBER 31,
                                        ---------------------------------------
                                            1997          1998         1999
                                        ------------  ------------  -----------
<S>                                     <C>           <C>           <C>
Net loss applicable to common
 stockholders.........................  $(12,392,000) $(13,510,000) $(9,085,000)

Basic and diluted net loss per share..  $      (7.72) $      (7.64) $     (3.86)
                                        ============  ============  ===========
Weighted-average shares used in
 computing historical net loss per
 share, basic and diluted.............     1,606,000     1,768,000    2,353,000

Pro forma:
  Net loss............................                              $(9,085,000)
Pro forma net loss per share, basic
 and diluted (unaudited)..............                              $     (0.36)
                                                                    ===========

Shares used above.....................                                2,353,000
  Pro forma adjustment to reflect
   weighted-average effect of assumed
   conversion of convertible preferred
   stock (unaudited)..................                               22,834,000
                                                                    -----------
  Shares used in computing pro forma
   net loss per share, basic and
   diluted (unaudited)................                               25,187,000
</TABLE>


                                      F-9
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

   The Company has excluded all convertible preferred stock, outstanding stock
options and warrants, and shares subject to repurchase from the calculation of
diluted loss per common share because all such securities are antidilutive for
all applicable periods presented. The total number of shares excluded from the
calculations of diluted net loss per share, prior to application of the
treasury stock method for options and warrants, was 23,620,000, 24,231,000 and
25,959,000 for the years ended December 31, 1997, 1998 and 1999, respectively.
Such securities, had they been dilutive, would have been included in the
computation of diluted net loss per share.

   Segment Reporting

   As of January 1, 1998, the Company adopted SFAS No. 131, Disclosure about
Segments of an Enterprise and Related Information. SFAS No. 131 establishes
annual and interim reporting standards for an enterprise's operating segments
and related disclosures about its products, services, geographic areas, and
major customers. The Company has determined that it operates in only one
segment. Accordingly, the adoption of this statement had no impact on the
Company's financial statements.

   Effect of New Accounting Standards

   In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
Accounting for Derivative Instruments and Hedging Activities, which will be
effective January 1, 2001. This statement establishes accounting and reporting
standards requiring that every derivative instrument, including certain
derivative instruments imbedded in other contracts, be recorded in the balance
sheet as either an asset or liability measured at its fair value. The statement
also requires that changes in the derivative's fair value be recognized in
earnings unless specific hedge accounting criteria are met. The Company
believes the adoption of SFAS No. 133 will not have a material effect on the
financial statements.

2. BALANCE SHEET DETAILS

   Accounts receivable consist of the following:

<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                           --------------------
                                                            1998       1999
                                                           -------  -----------
   <S>                                                     <C>      <C>
   Trade.................................................. $13,000  $    23,000
   Grants.................................................  41,000      204,000
   Partnership alliances..................................      --   15,345,000
                                                           -------  -----------
                                                            54,000   15,572,000
   Allowance for doubtful accounts........................  (6,000)      (1,000)
                                                           -------  -----------
   Total.................................................. $48,000  $15,571,000
                                                           =======  ===========
</TABLE>

   The partnership alliance receivable consists primarily of a receivable from
Novartis related to the joint venture discussed in Note 3. This receivable was
recorded upon the commencement of the related research efforts in December 1999
after the agreement was signed, and the payment of the receivable is due by
February 2000.

                                      F-10
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Property and equipment consist of the following:

<TABLE>
<CAPTION>
                                                            DECEMBER 31,
                                                       ------------------------
                                                          1998         1999
                                                       -----------  -----------
   <S>                                                 <C>          <C>
   Laboratory equipment............................... $ 4,228,000  $ 5,720,000
   Computer equipment.................................   1,735,000    2,112,000
   Furniture and fixtures.............................     274,000      322,000
   Leasehold improvements.............................      77,000      132,000
                                                       -----------  -----------
                                                         6,314,000    8,286,000
   Accumulated depreciation and amortization..........  (3,692,000)  (5,190,000)
                                                       -----------  -----------
   Total.............................................. $ 2,622,000  $ 3,096,000
                                                       ===========  ===========
</TABLE>

   At December 31, 1999, other assets primarily consisted of a $4.0 million
long-term receivable from the Novartis joint venture (See Note 3). This
receivable is due in June 2001, and is carried at its present value using a
discount rate of 15%.

   Accrued liabilities consist of the following:

<TABLE>
<CAPTION>
                                                               DECEMBER 31,
                                                           ---------------------
                                                              1998       1999
                                                           ---------- ----------
   <S>                                                     <C>        <C>
   Compensation........................................... $  855,000 $  929,000
   Professional fees......................................    334,000    287,000
   Property taxes.........................................     67,000     85,000
   Other..................................................    274,000    352,000
                                                           ---------- ----------
                                                           $1,530,000 $1,653,000
                                                           ========== ==========
</TABLE>

3. SIGNIFICANT STRATEGIC ALLIANCES

   Novartis Agribusiness Biotechnology Research

   In January 1999, the Company entered into a strategic alliance with Novartis
Agribusiness Biotechnology Research Inc. ("Novartis"). Under the agreement, the
Company will receive research funding from Novartis to conduct multiple
independent research projects with the intention of identifying and developing
biomolecules that meet the scientific specifications of Novartis. In
conjunction with the transaction, Novartis purchased 5,555,556 shares of Series
E Convertible Preferred Stock for gross proceeds of $7.3 million, paid a
technology access fee of $3.0 million, and provided project research funding of
$2.2 million to the Company, for aggregate total proceeds of $12.5 million. The
Company is recognizing the research payments and the technology access fee on a
percentage of completion basis as research is performed. The only obligation of
the Company under this agreement is to perform research activities; Novartis
did not acquire any rights or privileges other than as disclosed in Note 4 as
an owner of Series E preferred stock.

   All of the research required under the collaboration was completed by
December 31, 1999, and accordingly the entire technology access fee of $3.0
million and the research funding of $2.2 million were recognized in 1999. The
Company has no further performance obligations related to this alliance.

   Novartis Joint Venture

   In December 1999, the Company formed a five-year, renewable strategic
alliance with Novartis Seeds AG ("Novartis"). Through a contract joint venture,
the Company and Novartis will jointly pursue opportunities in the field of
animal feed and agricultural product processing. Both parties will share in the
management of the venture and fund a portion of the sales and marketing costs
of this venture. Under the agreements, Novartis receives exclusive, worldwide
rights in the field of animal feed and project exclusive, worldwide rights in
the

                                      F-11
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

field of agricultural product processing. Novartis will pay for the license
granted under this agreement, of which $15.0 million is due by February 2000
and an additional $5 million due in June 2001. The Company has recorded the
receivable at its present value of $4.0 million. The technology access fee will
be recognized as revenue on a straight-line basis over the term of the
agreement which approximates the timing of the actual performance requirements.
Additionally, the Company will receive minimum research funding over five years
of $33.9 million, as well as milestone payments upon achievement of project
objectives totalling up to $7.7 million and license and commercialization fees
for any resulting products. Research funding will be recognized as the research
is performed, and milestone payments will be recognized as revenue when earned.
The Company will receive a share of the profits in the form of royalties on any
product sales. The joint venture is 50% owned, and therefore the Company will
account for the results of the joint venture utilizing the equity method.

   Revenue recognized under the Novartis contract joint venture agreement was
$0.8 million for the year ended December 31, 1999, consisting of research
funding of $0.5 million and amortization of the license fee of $0.3 million.

   The Dow Chemical Company

   In July 1999, the Company expanded its existing strategic alliance with The
Dow Chemical Company ("Dow"). Under the expanded agreement, the Company will
seek to identify and develop enzymes that can be utilized by Dow to manufacture
chemical compounds. The three-year agreement requires Dow to make annual
technology development payments of $1.5 million each year. Dow will fund the
research costs for the duration of the contract totaling $10.8 million. The
Company will receive milestone payments of up to $2.7 million upon achievement
of established objectives and license and commercialization fees for any
resulting products. The Company will receive royalties on product sales. The
Company is amortizing the technology development fees over the minimum
guaranteed period of the agreement.

   Revenue recognized under the strategic alliance with Dow was approximately
$2.5 million (27% of total collaborative revenues) for the year ended December
31, 1999, consisting of research funding of $1.9 million, and amortization of
technology development fees of $0.6 million.

   In June 1997, the Company entered into an initial agreement with Dow to
develop an enzyme to be used in a Dow industrial process. As of December 31,
1998, the Company had successfully achieved the three technical milestones as
outlined in the agreement.

   Finnfeeds International Limited

   In May 1996, the Company entered into a strategic alliance with Finnfeeds
International Limited ("Finnfeeds") to jointly discover new enzymes for the
animal feed market. In conjunction with the agreement, the Company issued
844,444 shares of its Series C Redeemable Convertible Preferred Stock to
Finnfeeds for $1,900,000. The Company received and recognized as revenue $0.8
million in research funding over the period from May 1996 through December 31,
1998. The only obligation of the Company under this agreement is to perform
research activities; Finnfeeds did not acquire any rights or privileges other
than as disclosed in Note 4 as an owner of Series C preferred stock.

   In December 1998, the Company and Finnfeeds entered into a license agreement
to commercialize an enzyme developed under the strategic alliance. Under the
terms of the agreement, the Company granted Finnfeeds an exclusive license to
manufacture, use and sell the developed enzyme. In consideration for the
license, the Company will be paid a royalty on related product sales made by
Finnfeeds.

                                      F-12
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Terragen Discovery Inc.

   In November 1999, the Company signed a license agreement with Terragen
Discovery Inc. ("Terragen") under which Terragen and the Company agreed to
cross license certain technologies. The Company entered into the agreement to
obtain exclusive, non-transferrable access to a Terragen technology which could
have been valuable to a competitor. Terragen obtained an exclusive, non-
transferable license to certain Diversa technology relating to screening from
the environment for small molecules. Under the terms of the agreement, the
Company made an initial payment of $2.5 million in 1999 and agreed to make
annual payments of $100,000 to Terragen to maintain the patent rights over the
remaining patent life. The Company intends to make all required payments, in
order to maintain the license through the patent expiration date. The Terragen
license was acquired to enhance the Company's intellectual property position in
combinational libraries. The Company believes the benefits associated with
preventing a competitor from licensing the Terragen technology exceed the
financial costs of the agreement. These benefits include certain marketing
advantages as well as increased protection from potential litigation, although
there had never been any asserted or unasserted claims against the Company
related to this technology. The Company has capitalized the initial payment as
an intangible asset, which will be amortized over the sixteen year patent life.

   Other Agreements

   The Company has signed various agreements with research institutions,
governmental and commercial entities. Generally these agreements call for the
Company to pay research support, cost reimbursement and, in some cases,
subsequent royalty payments in the event a product is commercialized. The
financial impact of these agreements on the Company is not significant.

4. PREFERRED STOCK AND STOCKHOLDERS' EQUITY

   Initial Public Offering

   In December 1999, the board of directors authorized management of the
Company to file a registration statement with the Securities and Exchange
Commission permitting the Company to sell shares of its common stock to the
public. If the initial public offering is closed under the terms presently
anticipated, all of the preferred stock outstanding will automatically convert
into 22,834,011 shares of common stock. Unaudited pro forma stockholders'
equity, as adjusted for the assumed conversion of the preferred stock, is set
forth on the balance sheet.

   Authorization of Preferred Stock

   In December 1999, the board of directors approved an amendment to the
Company's articles of incorporation to authorize an additional 5,000,000 shares
of undesignated preferred stock, for which the board of directors is authorized
to fix the designation, powers, preferences, and rights, and authorized an
additional 5,000,000 shares of common stock.

   Characteristics and Terms Applicable to Preferred Stock

   The Company has Series A, B, C, D and E preferred stock (the "Preferred
Stock") outstanding at December 31, 1999. All outstanding shares of Preferred
Stock automatically convert into Common Stock upon the effective date of an
initial public offering ("IPO") with gross proceeds exceeding $25 million and a
price per share of not less than $3.00. The Preferred Stock is convertible at
any time into Common Stock of the Company at a conversion ratio (one to one)
determined based on a formula provided in the Company's Restated Certificate of
Incorporation. The conversion ratio will be adjusted to 1-for-2.8806 when the
reverse stock split discussed in Note 11 is effected. The Company has reserved
the full number of shares of Common Stock issuable upon conversion of the
Preferred Stock.

                                      F-13
<PAGE>

                              DIVERSA CORPORATION

                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   A summary of convertible preferred stock issued and outstanding as of
December 31, 1999 is as follows:

<TABLE>
<CAPTION>
                                                                     LIQUIDATION
                                                            SHARES   PREFERENCE
                                                          ---------- -----------
     <S>                                                  <C>        <C>
     Series A............................................ 10,000,000 $10,000,000
     Series B............................................ 24,566,184  16,873,681
     Series C............................................    844,444          --
     Series D............................................ 24,809,555  21,088,122
     Series E............................................  5,555,556   4,722,223
                                                          ---------- -----------
                                                          65,775,739 $52,684,026
                                                          ========== ===========
</TABLE>

   The liquidation preference on the Series C Preferred Stock is determined by
the board of directors of the Company, and is based on the board's
interpretation of the value of the intellectual property rights related to the
genes and gene-sequencing technology developed under the Finnfeeds
collaboration agreement.

   Dividends are payable when and if declared by the board of directors for
the Series A, B and D Stockholders. Such dividends will be declared so that
each of these Stockholders participates equally. From December 21, 1999 until
the date of the consummation of the first sale of common shares in an IPO, the
Series A, B and D Preferred Stockholders are entitled to a 5% dividend per
annum. The Company has accrued $66,000 in dividends payable, as of December
31, 1999, and will continue to accrue approximately $6,500 per day through the
completion of an initial public offering. The Company intends to settle the
dividend payable through the issuance of shares of common stock valued at the
IPO price. The dividend for the Series A, B and D Preferred stock is $0.05,
$0.033, and $0.0425 per share, respectively, or such greater amount of
dividends as the Preferred Stockholders would be entitled to if converted into
Common Stock. Dividends are payable when and if declared by the board of
directors on the Series C and E Preferred Stock, but are junior to the
dividends on the Series A, B and D Preferred Stock.

   The Preferred Stockholders have voting rights on an "as if converted" basis
on most matters; however, the approval of a majority of the Preferred
Stockholders voting as a separate class is required for certain transactions.

   In the event of a liquidation, the Series A, B and D Preferred Stockholders
are entitled to receive on a pro rata basis a liquidation payment in an amount
equal to the original issuance price of the Preferred Stock plus any unpaid
cumulative dividends plus declared but unpaid dividends, as well as a pro rata
distributive share of any remaining assets on an "as if fully converted" basis
with the Common Stock.

   The Company will be required to redeem the Series A, B, C and D Preferred
Stock on and after May 2001, upon a written request of the Preferred
Stockholders representing not less than 75% of the combined voting power of
the Preferred Stock. The redemption price of the Preferred Stock is equal to
the original issuance price, plus unpaid cumulative dividends and declared but
unpaid dividends. The Series C Preferred Stock will be redeemed only after
full redemption of the Series A, B and D Preferred Stock.

   Series A Redeemable Convertible Preferred Stock

   During 1994 and 1995, the Company issued a total of 10,000,000 shares of
Series A Redeemable Convertible Preferred Stock for aggregate net proceeds of
$9,927,000.

   Series B Redeemable Convertible Preferred Stock

   In May 1996, the Company issued 18,939,394 shares of Series B Redeemable
Convertible Preferred Stock (the "Series B Preferred Stock") for aggregate net
proceeds of $11,947,000. In December 1996, the Company

                                     F-14
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

issued an additional 4,545,455 shares of Series B Redeemable Convertible
Preferred Stock for aggregate proceeds of $3,000,000. In conjunction with the
issuance of Series B Redeemable Convertible Preferred Stock, rights were
granted to certain key employees and consultants to purchase an additional
1,272,727 shares of Series B Preferred Stock for $840,000. In December 1996,
certain of these individuals exercised their rights and purchased 967,698
shares of Series B Preferred Stock for $640,000.

   In May 1997, two key employees exercised their rights and purchased a total
of 113,637 shares of Series B Preferred Stock for $0.66 per share in exchange
for promissory notes aggregating $75,000. The notes are payable over four years
in equal annual installments commencing March 30, 1998, and bear interest at
6.64% per annum. These notes have been recorded as a separate component of
stockholders' equity (deficit). The right to purchase an additional $125,000 in
Series B Preferred Stock expired in May 1997. In 1999, the Company forgave
$44,000 related to notes receivable from certain employees, and recorded
compensation expense for the forgiveness.

   Series C Redeemable Convertible Preferred Stock

   In July 1997, the Company issued 844,444 shares of Series C Redeemable
Convertible Preferred Stock (the "Series C Preferred Stock") to Finnfeeds for
$2.25 per share in conjunction with a collaboration agreement (Note 3). Total
issuance costs of $10,000 were netted against the cash proceeds. The rights of
the Series C Preferred Stock are junior to the rights of Series A, B and D
Preferred Stock, and on par with the Series E Preferred Stock.

   Series D Redeemable Convertible Preferred Stock

   In October 1997, the Company issued 24,809,555 shares of Series D Redeemable
Convertible Preferred Stock (the "Series D Preferred Stock") for $0.85 per
share. The $21,088,000 total issuance price of the Series D Preferred Stock
included the conversion of bridge notes in the amount of $3,433,000, the
exchange of Series I Preferred Stock in the amount of $688,000 and a $50,000
note receivable from a key employee which is payable over four years in equal
annual installments commencing December 1997, and bears interest at 6.64% per
annum. Total issuance costs of $165,000 were netted against the cash proceeds.

   Series E Convertible Preferred Stock

   In January 1999, in conjunction with a strategic alliance signed with
Novartis (Note 3), the Company sold 5,555,556 shares of Series E Convertible
Preferred Stock. The terms of the stock purchase agreement designate a portion
of the proceeds as a technology access fee, a portion of the proceeds as
advance payments for research support under the collaboration agreement, and
$7,333,000 for the Series E Convertible Preferred Stock ($1.32 per share). The
rights of the Series E Convertible Preferred Stock are junior to the rights of
Series A, B and D with respect to dividends and liquidation preferences.

5. STOCK OPTION PLANS AND WARRANTS

   1999 Employee Stock Purchase Plan

   In December 1999, the board of directors adopted the 1999 Employee Stock
Purchase Plan (the "Purchase Plan"). A total of 416,579 shares of the Company's
common stock have been reserved for issuance under the Purchase Plan. The
Purchase Plan permits eligible employees to purchase common stock at a
discount, but only through payroll deductions, during defined offering periods.
The price at which stock is purchased under the Purchase Plan is equal to 85%
of the fair market value of the common stock on the first or last day of the
offering period, whichever is lower. The initial offering period will commence
on the effective date of the

                                      F-15
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

offering. In addition, the Purchase Plan provides for annual increases of
shares available for issuance under the Purchase Plan beginning with fiscal
2001.

   1999 Nonemployee Directors Stock Option Plan

   In December 1999, the Company adopted the 1999 Nonemployee Directors Stock
Option Plan and reserved a total of 277,719 shares of common stock for issuance
thereunder. Each nonemployee director who becomes a director of the Company
will be automatically granted a nonstatutory stock option to purchase 27,772
shares of common stock on the date on which such person first becomes a
director. At each board meeting immediately following each annual stockholders
meeting beginning with the first board meeting after the 1999 Annual
Stockholders Meeting, each nonemployee director will automatically be granted a
nonstatutory option to purchase 1,736 shares of common stock. The exercise
price of options under the director plan will be equal to the fair market value
of the common stock on the date of grant. The maximum term of the options
granted under the director plan is ten years. Each initial grant under the
director plan will vest as to 25% of the shares subject to the option one year
after the date of grant and at a rate of 25% of the shares at the end of each
year. Each subsequent grant will vest in full one year after the date of grant.
The director plan will terminate in September 2009, unless terminated earlier
in accordance with the provisions of the director plan.

   The 1997 Equity Incentive Plan

   In August 1997, the Company adopted the 1997 Equity Incentive Plan (the
"1997 Plan") which provides for the granting of incentive or non-statutory
stock options, stock bonuses, and rights to purchase restricted stock to
employees, directors, and consultants as administered by the human resources
committee of the board of directors. Unless terminated sooner by the board of
directors, the 1997 Plan will terminate in August 2007.

   The incentive and non-statutory stock options are granted with an exercise
price of not less than 100% and 85%, respectively, of the estimated fair value
of the underlying common stock as determined by the board of directors. The
1997 Plan allows a purchase price for each restricted stock purchase that is
not less than 85% of the estimated fair value of the Company's common stock as
determined by the board of directors.

   Options granted under the 1997 Plan vest over periods ranging up to four
years and are exercisable over periods not exceeding ten years. The aggregate
number of shares which may be awarded under the 1997 Plan is 5,836,468, and an
equal number of shares of common stock are reserved for the exercise of these
options. This aggregate number includes 3,020,204 shares which were authorized
by the board of directors in October 1999.

   The Restated 1994 Employee Incentive and Non-Qualified Stock Option Plan

   The Restated 1994 Employee Incentive and Non-Qualified Stock Option Plan
(the "1994 Plan") provides for the granting of incentive or non-qualified stock
options to employees and consultants as administered by the human resources
committee of the board of directors. The incentive stock options are granted
with an exercise price of not less than the estimated fair value of the
underlying common stock as determined by the board of directors. The non-
qualified stock options are granted with an exercise price of not less than
$0.03.

   Options granted under the 1994 Plan vest over periods ranging up to four
years and are exercisable over periods not exceeding ten years. Options to
purchase 951,902 shares have been granted under the 1994 Plan and 110,000
options remain outstanding related to the 1994 Plan. In August 1997, this Plan
was terminated and there are no options available for future grant.

                                      F-16
<PAGE>

                              DIVERSA CORPORATION

                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   Information with respect to the plans is as follows:

<TABLE>
<CAPTION>
                                                                WEIGHTED AVERAGE
                                                      SHARES     EXERCISE PRICE
                                                    ----------  ----------------
   <S>                                              <C>         <C>
   Balance at January 1, 1997......................  1,279,000       $0.40
     Granted.......................................  1,203,000       $0.43
     Exercised.....................................    (51,000)      $0.35
     Cancelled.....................................    (81,000)      $0.46
                                                    ----------
   Balance at December 31, 1997....................  2,350,000       $0.43
     Granted.......................................  1,185,000       $0.58
     Exercised.....................................   (228,000)      $0.26
     Cancelled.....................................   (346,000)      $0.43
                                                    ----------
   Balance at December 31, 1998....................  2,961,000       $0.49
     Granted.......................................  1,515,000       $3.14
     Exercised..................................... (1,089,000)      $0.55
     Cancelled.....................................   (262,000)      $0.49
                                                    ----------
   Balance at December 31, 1999....................  3,125,000       $1.73
                                                    ==========
</TABLE>

   At December 31, 1999, options under the plans to purchase approximately
3,125,000 shares were exercisable and approximately 2,368,000 shares remain
available for grant.

   Following is a further breakdown of the options outstanding under the plans
as of December 31, 1999:

<TABLE>
<CAPTION>
                                             WEIGHTED                                     WEIGHTED
                                             AVERAGE         WEIGHED                  AVERAGE EXERCISE
                                OPTIONS   REMAINING LIFE AVERAGE EXERCISE   OPTIONS   PRICE OF OPTIONS
   RANGE OF EXERCISE PRICES   OUTSTANDING    IN YEARS         PRICE       EXERCISABLE   EXERCISABLE
   ------------------------   ----------- -------------- ---------------- ----------- ----------------
   <S>                        <C>         <C>            <C>              <C>         <C>
   $0.03--$0.49............      469,000       7.0            $0.40          469,000       $0.40
   $0.58...................    1,331,000       8.4            $0.58        1,331,000       $0.58
   $1.73--$8.64............    1,325,000       9.7            $3.43        1,325,000       $3.43
                               ---------                                   ---------
   $0.03--$8.64............    3,125,000       8.8            $1.73        3,125,000       $1.73
                               =========                                   =========
</TABLE>

   The Company has outstanding an option to purchase 13,937 shares of common
stock with an exercise price of $0.03 per share that was issued in 1994 to a
founder of the Company as consideration for waiving certain rights in
conjunction with a previous financing. This option was issued outside of the
1994 and 1997 plans. The option expires at the earlier of the 10th anniversary
of the option or eighteen months after the completion of an IPO.

   Adjusted pro forma information regarding net loss and net loss per share is
required by SFAS No. 123 and has been determined as if the Company had
accounted for its employee stock options and stock purchase plan under the
fair value method of SFAS No. 123. The fair value for these options was
estimated at the date of grant using the "Minimum Value" method for option
pricing with the following assumptions for 1997, 1998 and 1999; risk-free
interest rates of 6.50%; dividend yield of 0%; and a weighted-average expected
life of the options of five years.

                                     F-17
<PAGE>

                              DIVERSA CORPORATION

                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


   For purposes of adjusted pro forma disclosures, the estimated fair value of
the options is amortized to expense over the vesting period. The Company's
adjusted pro forma information is as follows:

<TABLE>
<CAPTION>
                                            YEARS ENDED DECEMBER 31,
                                      ---------------------------------------
                                          1997          1998         1999
                                      ------------  ------------  -----------
   <S>                                <C>           <C>           <C>
   Adjusted pro forma net loss....... $(12,466,000) $(13,572,000) $(9,251,000)
   Adjusted pro forma basic net loss
    per share........................ $      (7.76) $      (7.68) $     (3.93)
</TABLE>

   The pro forma effect on net loss for 1997, 1998 and 1999 is not likely to
be representative of the pro forma effects on reported net income or loss in
future years because these amounts reflect less than four years of vesting.

   During the years ended December 31, 1997, 1998 and 1999, in connection with
the grant of certain stock options to employees, the Company recorded deferred
stock compensation totaling approximately $10.8 million, representing the
difference between the exercise price and the fair value of the Company's
common stock as estimated by the Company's management for financial reporting
purposes on the date such stock options were granted. Deferred compensation is
included as a reduction of stockholders' equity and is being amortized to
expense over the vesting period of the options. During the year ended December
31, 1999, the Company recorded amortization of deferred stock compensation
expense of approximately $3.0 million.

   The Company has a total of approximately 364,000 warrants outstanding,
consisting of approximately 174,000 warrants to purchase Series A Preferred
Stock at $2.88 per share, and approximately 190,000 warrants to purchase
common stock at between $0.03 and $0.43 per share. The common stock warrants
were issued in previous years in connection with certain debt and equity
financing transactions, and expire through 2006. The Series A Preferred Stock
warrants were issued in conjunction with a lease financing agreement, and
expire at the later of February 2005, or the fifth anniversary of the
completion of an initial public offering.

   At December 31, 1999, the Company has reserved shares of common stock for
future issuance as follows:

<TABLE>
   <S>                                                                <C>
   Conversion of convertible preferred stock......................... 22,834,000
   1994 and 1997 Stock Option Plan...................................  5,493,000
   Option issued to a founder of the Company.........................     14,000
   Warrants..........................................................    364,000
                                                                      ----------
                                                                      28,705,000
                                                                      ==========
</TABLE>

   Employee Terminations

   During 1999, the Company agreed to separation terms with two former
officers. In conjunction with these agreements, the Company agreed to
accelerate one year's unvested options for one officer, and extend the vesting
period for one year for the other officer. The Company considered each
modification to require a remeasurement of the options and accordingly
recorded an expense of $1.1 million related to the option modifications. The
expense was recorded at the time of the separation as the former officers will
perform no services on behalf of the Company after the separation date.

6. BENEFIT PLAN

   The Company has a 401(k) plan which allows participants to defer a portion
of their income through contributions. Such deferrals are fully vested and are
not taxable to the participant until distributed from the plan upon
termination, retirement, permanent disability or death. During the years ended
December 31, 1997, 1998 and 1999, the Company made discretionary contributions
of approximately $39,000, $45,000 and $54,000, respectively.

                                     F-18
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


7. COMMITMENTS AND CONTINGENCIES

   The Company leases office and laboratory space as well as equipment under
noncancelable leases as follows:

<TABLE>
<CAPTION>
                                                           CAPITAL   OPERATING
                                                            LEASES     LEASES
                                                          ---------- ----------
   <S>                                                    <C>        <C>
   Year ending December 31:
     2000................................................ $  943,000 $  563,000
     2001................................................  1,012,000    580,000
     2002................................................  1,035,000     49,000
     2003................................................    817,000         --
     2004................................................    296,000         --
   Thereafter............................................     45,000         --
                                                          ---------- ----------
   Total minimum lease payments..........................  4,148,000 $1,192,000
                                                                     ==========
   Amount representing interest..........................    871,000
                                                          ----------
   Present value of minimum capital lease obligations....  3,277,000
   Current portion.......................................    600,000
                                                          ----------
   Long-term capital lease obligation.................... $2,677,000
                                                          ==========
</TABLE>

   The operating lease commitment includes rental payments due under the
Company's San Diego facility lease and excludes approximately $390,000 in
payments due related to a previously occupied facility for which the Company
has sublessee rental commitments to meet substantially all required lease
payments, and has received a $300,000 deposit from the sublessee. For the years
ended December 31, 1997, 1998, and 1999, rent and administrative service
expense under operating leases for the San Diego facility was approximately
$413,000, $516,000, and $533,000, respectively.

   Equipment acquired under capital leases is included in property and
equipment, and amounted to $4,971,000 and $6,075,000 (net of accumulated
amortization of $2,421,000 and $1,916,000) as of December 31, 1998 and December
31, 1999, respectively. The Company's capital lease obligations mature at
various dates through 2004 with interest rates ranging from 9.5% to 15.7%. As
of December 31, 1999, the Company has $828,000 available under lease financing
lines.

8. NOTES PAYABLE

   In March 1995, the Company issued a $600,000 note payable with a 9% per
annum interest rate payable in connection with the acquisition of fixed assets.
The note was paid in full in 1999.

9. RELATED PARTY TRANSACTIONS

   Included in the statement of operations are consulting fees and reimbursed
expenses to various stockholders, amounting to approximately $275,000 and
$413,000 for the year ended December 31, 1998 and 1999, respectively.

                                      F-19
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)


10. INCOME TAXES

   Significant components of the Company's deferred tax assets are shown below.
A valuation allowance of $19,269,000 and $22,605,000 has been recognized to
offset the deferred tax assets at December 31, 1998 and 1999, respectively, as
realization of such assets is uncertain.

<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                                     --------------------------
                                                         1998          1999
                                                     ------------  ------------
<S>                                                  <C>           <C>
Deferred tax assets:
  Net operating loss carryforwards.................. $ 16,584,000  $ 17,724,000
  Deferred revenue..................................           --     1,155,000
  Licenses..........................................           --     1,266,000
  Start-up costs....................................      556,000       278,000
  Allowances and accrued liabilities................      574,000       349,000
  Federal and state tax credits.....................    1,391,000     1,669,000
  Depreciation......................................      164,000       164,000
                                                     ------------  ------------
  Total deferred tax assets.........................   19,269,000    22,605,000
  Valuation allowance...............................  (19,269,000)  (22,605,000)
                                                     ------------  ------------
Net deferred tax assets............................. $         --  $         --
                                                     ============  ============
</TABLE>

   At December 31, 1999, the Company has federal and California net operating
loss carryforwards of approximately $45,817,000 and $28,901,000, respectively.
The federal net operating loss carryforwards will begin to expire in 2009. The
California net operating loss carryforwards will continue to expire in 2000
(approximately $760,000 expired in 1999). The Company also has federal and
California tax credits of approximately $1,242,000 and $657,000, respectively,
which will expire in 2009.

   Pursuant to Sections 382 and 383 of the Internal Revenue Code, annual use of
the Company's net operating loss and credit carryforwards may be limited in the
event of a cumulative change in ownership of more than 50%. However, the
Company does not believe such limitation will have a material effect upon the
utilization of these carryforwards.

11. SUBSEQUENT EVENTS

   In February 2000, the Company effected a 1-for-2.8806 reverse stock split of
the Company's common stock. All share data have been retroactively restated to
reflect the reverse stock split. In conjunction with the reverse stock split,
the certificate of incorporation was amended to authorize 65,000,000 shares of
common stock and 5,000,000 shares of preferred stock.

   In February 2000, the Company initiated a loan program for 6 employees to
loan them monies to pay a personal tax liability. This tax liability resulted
from the Company's delayed filing of a Form 83B election related to those
employees' exercise of incentive and non qualified stock options during 1999.
This failure to timely file the Form 83B election exposed the employees to
significant personal tax liability. To limit the tax exposure, the Company has
elected to accelerate the vesting of the remaining unvested options, totaling
approximately 207,000 options, and will loan the employees a total of $1.6
million in full recourse promissory notes. The acceleration of the unvested
options will result in a non-cash compensation charge to the Company of
approximately $4.1 million in the first quarter of 2000. Additionally, the
Company will directly compensate two individuals a total of $240,000, which
will be a cash compensation charge recorded in the first quarter of 2000. The
loans carry a market interest rate, and will be repaid over a five year term.
In addition, the proceeds from any sale of stock or realization of the
individuals' tax credit carryforward will first be used to repay the
outstanding loan.

                                      F-20
<PAGE>

                              DIVERSA CORPORATION

                   NOTES TO FINANCIAL STATEMENTS--(CONTINUED)

   In February 2000, the Company accelerated the vesting on 104,145 stock
options previously granted to a director of the Company who also serves as
Chairman of the Scientific Advisory Board and as a consultant. To the extent
the option grants were for consulting services, the Company will record a non-
cash charge to operations of $1.7 million in the first quarter of 2000 in
accordance with SFAS 123 and EITF 96-18. This charge was calculated based on
the fair value of the common stock on the date of the modification, which was
calculated using the Black-Scholes pricing model, and the expense was recorded
on the measurement date of the option modification. There will be no future
expense associated with this option grant, however, Dr. Simon will be
compensated $1,000 per day for future consulting services as these services are
performed.

                                      F-21
<PAGE>

                               [LOGO OF DIVERSA]
<PAGE>

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

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

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

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

                               TABLE OF CONTENTS

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

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   1
Risk Factors.............................................................   5
Special Statement Regarding Forward-Looking Statements...................  16
Use of Proceeds..........................................................  16
Dividend Policy..........................................................  16
Corporate Information....................................................  16
Capitalization...........................................................  17
Dilution.................................................................  18
Selected Financial Information...........................................  19
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  20
Business.................................................................  26
Management...............................................................  44
Certain Transactions.....................................................  56
Principal Stockholders...................................................  60
Description of Capital Stock.............................................  62
Shares Eligible for Future Sale..........................................  65
Underwriting.............................................................  66
Legal Matters............................................................  68
Experts..................................................................  68
Where You Can Find More Information......................................  69
Index to Financial Statements............................................ F-1
</TABLE>

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

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



                               [LOGO OF DIVERSA]



                               7,000,000 SHARES

                                 COMMON STOCK

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

                                  PROSPECTUS

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

                           BEAR, STEARNS & CO. INC.

                                   CHASE H&Q

                           DEUTSCHE BANC ALEX. BROWN


                                       , 2000

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

   The following table sets forth all expenses payable by the Registrant in
connection with the sale of the common stock being registered. All the amounts
shown are estimates except for the SEC registration fee and the NASD filing
fee.

<TABLE>
<S>                                                                  <C>
Registration fee.................................................... $   46,755
NASD filing fee.....................................................     18,210
Nasdaq National Market listing fee..................................     95,000
Printing and engraving expenses.....................................    200,000
Legal fees and expenses.............................................    450,000
Accounting fees and expenses........................................    250,000
Blue Sky fees and expenses..........................................     10,000
Transfer agent and registrar fees...................................     10,000
Miscellaneous.......................................................    120,035
                                                                     ----------
    Total........................................................... $1,200,000
                                                                     ==========
</TABLE>

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

   The Company's Bylaws require that directors and officers be indemnified to
the maximum extent permitted by Delaware law.

   The Delaware General Corporation Law (the "Delaware GCL") provides that a
director or officer of a corporation (i) shall be indemnified by the
corporation for all expenses of litigation or other legal proceedings when he
is successful on the merits, (ii) may be indemnified by the corporation for the
expenses, judgments, fines and amounts paid in settlement of such litigation
(other than a derivative suit) even if he is not successful on the merits if he
acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation (and, in the case of a
criminal proceeding, had no reason to believe his conduct was unlawful), and
(iii) may be indemnified by the corporation for expenses of a derivative suit
(a suit by a stockholder alleging a breach by a director or officer of a duty
owed to the corporation), even if he is not successful on the merits, if he
acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation, provided that no such
indemnification may be made in accordance with this clause (iii) if the
director or officer is adjudged liable to the corporation, unless a court
determines that, despite such adjudication but in view of all of the
circumstances, he is entitled to indemnification of such expenses. The
indemnification described in clauses (ii) and (iii) above shall be made upon
order by a court or a determination by (i) a majority of disinterested
directors or by such committee such disinterested directors may designate, (ii)
if there are no such directors or if such directors so direct, by independent
legal counsel in a written opinion or (iii) the stockholders that
indemnification is proper because the applicable standard of conduct is met.
Expenses incurred by a director or officer in defending an action may be
advanced by the corporation prior to the final disposition of such action upon
receipt of an undertaking by such director or officer to repay such expenses if
it is ultimately determined that he is not entitled to be indemnified in
connection with the proceeding to which the expenses relate. The Company's
Certificate of Incorporation includes a provision eliminating, to the fullest
extent permitted by Delaware law, director liability for monetary damages for
breaches of fiduciary duty.

   The Company has entered into indemnity agreements (the "Indemnity
Agreements") with each director or officer designated by the Board of
Directors. The Indemnity Agreements require that the Company indemnify

                                      II-1
<PAGE>

directors and officers who are parties thereto in all cases to the fullest
extent permitted by our bylaws and by Delaware law. Under the Delaware GCL,
except in the case of litigation in which a director or officer is successful
on the merits, indemnification of a director or officer is discretionary rather
than mandatory. Consistent with the Company's Bylaw provision on the subject,
the Indemnity Agreements require the Company to make prompt payment of
litigation expenses at the request of the director or officer in advance of
indemnification provided that he undertakes to repay the amounts if it is
ultimately determined that he is not entitled to indemnification for such
expenses. The advance of litigation expenses is mandatory; under the Delaware
GCL such advance would be discretionary. Under the Indemnity Agreements, the
director or officer is permitted to bring suit to seek recovery of amounts due
under the Indemnity Agreements and is entitled to recover the expenses of
seeking such recovery if such suit for recovery is successful in whole or in
part. Without the Indemnity Agreements, the Company would not be required to
pay the director or officer for his expenses in seeking indemnification
recovery against the Company. Under the Indemnity Agreements, directors and
officers are not entitled to indemnity or advancing of expenses (i) if such
director or officer has recovered payment under an insurance policy for the
subject claim, or has otherwise been indemnified against the subject claim,
(ii) for actions initiated or brought by the director or officer and not by way
of defense (except for actions seeking indemnity or expenses from the Company),
(iii) if the director or officer violated section 16(b) of the Exchange Act or
similar provisions of law, (iv) if a court of competent jurisdiction determines
that the director or officer failed to act in good faith and in a manner
reasonably believed to be in or not opposed to the best interests of the
Company or, with respect to any proceeding which is of a criminal nature,
determines that the director or officers' conduct was knowingly fraudulent,
deliberately dishonest or constituted willful misconduct or (v) if
indemnification is unlawful. Absent the Indemnity Agreements, indemnification
that might be made available to directors and officers could be changed by
amendments to the Company's Certificate of Incorporation or Bylaws.

   The underwriting agreement provides that the underwriters are obligated,
under some circumstances, to indemnify our directors, officers and controlling
persons against specified liabilities, including liabilities under the
Securities Act. Reference is made to the form of underwriting agreement filed
as Exhibit 1.1 to this registration statement.

   In addition, we have an existing directors and officers liability insurance
policy.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.

   Since January 1, 1997, the Registrant has sold and issued the following
unregistered securities:

   (a) On July 14, 1997, the Registrant issued and sold 844,444 shares of its
Series C Preferred Stock to Finnfeeds International Limited for a purchase
price of $1,900,000, in connection with the Registrant's Collaboration
Agreement with Finnfeeds International Limited. The Registrant relied on the
exemption provided by Section 4(2) and/or Regulation D promulgated under the
Securities Act. The sale was made without general solicitation or advertising.
The purchaser was a sophisticated investor with access to all relevant
information necessary to evaluate the investment and represented to the
Registrant that the securities were being acquired for investment.

   (b) On September 2, 1997, the Registrant issued to 15 investors, secured
promissory notes for an aggregate of $3,432,804 that were convertible into
shares of the Registrant's Series D Preferred Stock. The Registrant relied on
the exemption provided by Section 4(2) and/or Regulation D promulgated under
the Securities Act. The issuances were made without general solicitation or
advertising. Each investor was a sophisticated investor with access to all
relevant information necessary to evaluate the investment and represented to
the Registrant that the securities were being acquired for investment.

   (c) On October 22, 1997, the Registrant issued and sold an aggregate of
24,809,555 shares of its Series D Preferred Stock to 27 investors for an
aggregate purchase price of $21,088,122, which reflected the conversion of all
of the Registrant's outstanding Series I Preferred Stock and convertible,
secured promissory notes into Series D Preferred Stock. The Registrant relied
on the exemption provided by Section 4(2) and/or

                                      II-2
<PAGE>

Regulation D promulgated under the Securities Act. The sales were made without
general solicitation or advertising. Each purchaser was a sophisticated
investor with access to all relevant information necessary to evaluate the
investment and represented to the Registrant that the securities were being
acquired for investment.

   (d) On January 25, 1999, the Registrant issued and sold 5,555,556 shares of
its Series E Preferred Stock to Novartis Agribusiness Biotechnology Research,
Inc. for a purchase price of $7,333,334 in connection with a Collaboration
Agreement between the parties. The Registrant relied on the exemption provided
by Section 4(2) and/or Regulation D promulgated under the Securities Act. The
sale was made without general solicitation or advertising. The purchaser was a
sophisticated investor with access to all relevant information necessary to
evaluate the investment and represented to the Registrant that the securities
were being acquired for investment.

   (e) From time to time since January 1, 1997, the Registrant has granted
stock options to purchase shares of its common stock to various employees and
consultants pursuant to its 1994 Employee Incentive and Non-Qualified Stock
Option Plan. With respect to all grants of options, exemption from registration
was unnecessary in that the transactions did not involve a "sale" of securities
as that term is used in Section 2(a)(3) of the Securities Act.

   (f) From time to time since August 28, 1997, the Registrant has granted
stock options to purchase shares of its common stock to various employees and
consultants pursuant to its 1997 Equity Incentive Plan. With respect to all
grants of options, exemption from registration was unnecessary in that the
transactions did not involve a "sale" of securities as that term is used in
Section 2(a)(3) of the Securities Act.

   (g) As of December 31, 1999, the Registrant had issued and sold, in the
aggregate, 62,949 shares of its common stock for per share exercise prices
ranging from $0.58 to $2.02 to employees and consultants pursuant to their
exercise of stock options granted under the Registrant's 1994 Employee
Incentive and Non-Qualified Stock Option Plan. The Registrant relied on the
exemption provided by Rule 701 under the Securities Act.

   (h) As of December 31, 1999, the Registrant had issued and sold, in the
aggregate, 702,386 shares of its common stock for per share exercise prices
ranging from $0.04 to $1.73 to employees and consultants pursuant to their
exercise of stock options granted under the Registrant's 1997 Equity Incentive
Plan. The Registrant relied on the exemption provided by Rule 701 under the
Securities Act.

   The common stock amounts and per share exercise prices in the descriptions
above reflect the 1-for-2.8806 reverse stock split of the Registrant's common
stock which will take place prior to effectiveness of this offering. The
recipients of the above-described securities represented their intention to
acquire the securities for investment only and not with a view to distribution
thereof. Appropriate legends were affixed to the stock certificates issued in
such transactions. All recipients had adequate access, through employment or
other relationships, to information about the Registrant.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

   (a) Exhibits.

<TABLE>
<CAPTION>
 NUMBER
 EXHIBIT                         DESCRIPTION OF DOCUMENT
 ------- ----------------------------------------------------------------------
 <C>     <S>
 1.1**   Form of Underwriter's Agreement.

 3.1**   Registrant's Certificate of Incorporation, as amended, as currently in
         effect.

 3.2**   Registrant's Bylaws, as amended, as currently in effect.

 3.3**   Form of Amended and Restated Certificate of Incorporation, to be filed
         prior to the Closing.

 3.4**   Form of Registrant's Amended and Restated Certificate of
         Incorporation, to be effective upon the closing of this offering.

 3.5**   Form of Registrant's Amended and Restated Bylaws, to be effective upon
         the closing of this offering.
</TABLE>

                                      II-3
<PAGE>

<TABLE>
<CAPTION>
 NUMBER
 EXHIBIT                         DESCRIPTION OF DOCUMENT
 ------- ----------------------------------------------------------------------
 <C>     <S>
  4.1**  Form of Common Stock Certificate of Registrant.

  5.1**  Opinion of Cooley Godward LLP.

 10.1**  Form of Indemnity Agreement entered into between the Company and its
         directors and executive officers.

 10.2**  1994 Employee Incentive and Non-Qualified Stock Option Plan, as
         amended.

 10.3**  Form of Stock Option Agreement under the 1994 Employee Incentive and
         Non-Qualified Stock Option Plan.

 10.4**  1997 Equity Incentive Plan.

 10.5**  Form of Stock Option Grant Notice and Stock Option Agreement under the
         1997 Equity Incentive Plan.

 10.6**  1999 Non-Employee Directors' Stock Option Plan.

 10.7**  Form of Stock Option Grant Notice and Related Stock Option Agreement
         under the 1999 Non-Employee Directors' Stock Option Plan.

 10.8**  1999 Employee Stock Purchase Plan.

 10.9**  Amended and Restated Stockholders' Agreement by and among the Company
         and the Stockholders identified therein, dated January 25, 1999.+

 10.10** Form of Warrant Agreement to purchase Series A Preferred Stock (with
         schedule of holders attached).

 10.11** Form of Warrant Agreement to purchase Common Stock (with schedule of
         holders attached).

 10.12** Form of Warrant Agreement to purchase Common Stock (with schedule of
         holders attached).

 10.13** Multi-Tenant Office R&D Building Lease by and between the Company and
         Sycamore/San Diego Investors, dated September 24, 1996.

 10.14** Master Lease Agreement by and between the Transamerica Business Credit
         Corporation and the Company, dated April 4, 1997.

 10.15   License Agreement by and between the Company and The Dow Chemical
         Company, dated July 20, 1997 and July 22, 1997.+

 10.16   Collaborative Research Agreement by and between the Company and The
         Dow Chemical Company, dated July 20, 1999 and July 22, 1999.+

 10.17** License Agreement by and between the Company and Finfeeds
         International Limited, dated December 1, 1998.+

 10.18** Collaboration Agreement by and between the Company and Novartis
         Agribusiness Biotechnology Research, Inc., dated January 25, 1999, as
         amended.+

 10.19** Stock Purchase Agreement by and between the Company and Novartis
         Agribusiness Biotechnology Research, Inc., dated January 25, 1999.+

 10.20** Collaboration Agreement by and between the Company and Rhone-Poulenc
         Animal Nutrition S.A., dated June 28, 1999.+

 10.21** License Agreement by and between the Company and Invitrogen
         Corporation, dated March 29, 1999.+

 10.22** License Agreement by and between the Company and Mycogen Corporation,
         dated December 1997, as amended on March 6, 1998 and December 19,
         1997.+

 10.23** Patent Cross-License Agreement by and between the Company and Terragen
         Discovery Inc., dated November 18, 1999.+
</TABLE>


                                      II-4
<PAGE>

<TABLE>
<CAPTION>
 NUMBER
 EXHIBIT                        DESCRIPTION OF DOCUMENT
 ------- ---------------------------------------------------------------------
 <C>     <S>
 10.24** Joint Venture Agreement by and between the Company and Novartis Seeds
         AG, dated December 1, 1999.+

 10.25** Research Lease by and between the Company One Cell Systems, Inc.,
         dated February 16, 1999.

 10.26** Research and Development Agreement by and between the Company and
         Novartis Enzymes, Inc., dated December 1, 1999.+

 10.27** Employment Offer Letter to Patrick Simms, dated February 3, 1997.

 10.28** Employment Offer Letter to Jay Short, dated August 30, 1994.

 10.29** Employment Offer Letter to Karin Eastham, dated April 2, 1999.

 10.30** Employment Offer Letter to William H. Baum, dated July 31, 1997.

 10.31** Separation Agreement by and between the Company and Terrance J.
         Bruggeman, effective as of April 12, 1999.

 10.32** Separation Agreement by and between the Company and Kathleen H. Van
         Sleen, effective as of May 10, 1999.

 10.33** Letter Agreement with Jay M. Short, Ph.D., dated June 25, 1998.

 16.1**  Letter from PricewaterhouseCoopers LLP to the Securities and Exchange
         Commission, dated January 28, 2000.

 23.1    Consent of Ernst & Young LLP, Independent Auditors.

 23.2**  Consent of Cooley Godward LLP. Reference is made to Exhibit 5.1.

 24.1**  Power of Attorney.

 27.1    Financial Data Schedule.
</TABLE>
- --------
*  To be filed by amendment.
** Previously filed as an exhibit to this Registration Statement.

+  Confidential Treatment will be requested with respect to portions of this
   exhibit. Omitted portions will be filed separately with the Securities and
   Exchange Commission.

   (b) Schedules

   All schedules are omitted because they are not required, are not applicable
or the information is included in the financial statements or notes thereto.

ITEM 17. UNDERTAKINGS.

   The undersigned registrant hereby undertakes to provide to the underwriter
at the closing specified in the underwriting agreements certificates in such
denominations and registered in such names as required by the underwriter to
permit prompt delivery to each purchaser.

   Insofar as indemnification for liabilities arising under the Act may be
permitted to directors, officers and controlling persons of the registrant
pursuant to provisions described in Item 14 or otherwise, the registrant has
been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the 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 Act and will be governed by the final adjudication of such
issue.

                                      II-5
<PAGE>

   The undersigned Registrant hereby undertakes:

   (1) That, for purposes of determining any liability under the Act, each
filing of the registrant's annual report pursuant to Section 13(a) or 15(d) of
the Exchange Act (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the 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.

   (2) That, for purposes of determining any liability under the Act, the
information omitted from the form of prospectus filed as part of this
Registration Statement in reliance upon Rule 430A and contained in a form of
prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h)
under the Act shall be deemed to be part of this Registration Statement as of
the time it was declared effective.

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

                                      II-6
<PAGE>

                                   SIGNATURES

   In accordance with the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-1 and has duly caused this
Amendment No. 5 to the Registration Statement to be signed on its behalf by the
undersigned, in the City of San Diego, County of San Diego, State of
California, on the 10th day of February, 2000.

                                          By:/s/ Karin Eastham
                                            -----------------------------------
                                            Karin Eastham
                                            Senior Vice President, Finance and
                                            Chief Financial Officer

   Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 5 to the Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.

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

<S>                                  <C>                           <C>
        /s/ Jay M. Short*            President, Chief Executive    February 10, 2000
   _________________________________ Officer, Chief Technology
        Jay M. Short, Ph.D.          Officer and Director
                                     (Principal Executive
                                     Officer)

        /s/ Karin Eastham            Senior Vice President,        February 10, 2000
____________________________________ Finance and Chief Financial
           Karin Eastham             Officer (Principal Financial
                                     Officer)
     /s/ James H. Cavanaugh*         Director                      February 10, 2000
____________________________________
     James H. Cavanaugh, Ph.D.

      /s/ Daniel T. Carroll*         Director                      February 10, 2000
____________________________________
         Daniel T. Carroll
    /s/ Patricia M. Cloherty*        Director                      February 10, 2000
____________________________________
        Patricia M. Cloherty
     /s/ Donald D. Johnston*         Director                      February 10, 2000
____________________________________
         Donald D. Johnston
         /s/ Mark Leschly*           Director                      February 10, 2000
____________________________________
            Mark Leschly
        /s/ Melvin I. Simon*         Director                      February 10, 2000
____________________________________
       Melvin I. Simon, Ph.D.
        /s/ Peter Johnson*           Director                      February 10, 2000
____________________________________
           Peter Johnson
    *By:  /s/ Karin Eastham
____________________________________
           Karin Eastham
     Attorney-in-Fact and Agent
</TABLE>

                                      II-7
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 NUMBER
 EXHIBIT                         DESCRIPTION OF DOCUMENT
 ------- ----------------------------------------------------------------------
 <C>     <S>
  1.1**  Form of Underwriter's Agreement.

  3.1**  Registrant's Certificate of Incorporation, as amended, as currently in
         effect.

  3.2**  Registrant's Bylaws, as amended, as currently in effect.

  3.3**  Form of Amended and Restated Certificate of Incorporation, to be filed
         prior to the Closing.

  3.4**  Form of Registrant's Amended and Restated Certificate of
         Incorporation, to be effective upon the closing of this offering.

  3.5**  Form of Registrant's Amended and Restated Bylaws, to be effective upon
         the closing of this offering.

  4.1**  Form of Common Stock Certificate of Registrant.

  5.1**  Opinion of Cooley Godward LLP.

 10.1**  Form of Indemnity Agreement entered into between the Company and its
         directors and executive officers.

 10.2**  1994 Employee Incentive and Non-Qualified Stock Option Plan, as
         amended.

 10.3**  Form of Stock Option Agreement under the 1994 Employee Incentive and
         Non-Qualified Stock Option Plan.

 10.4**  1997 Equity Incentive Plan.

 10.5**  Form of Stock Option Grant Notice and Stock Option Agreement under the
         1997 Equity Incentive Plan.

 10.6**  1999 Non-Employee Directors' Stock Option Plan.

 10.7**  Form of Stock Option Grant Notice and Related Stock Option Agreement
         under the 1999 Non-Employee Directors' Stock Option Plan.

 10.8**  1999 Employee Stock Purchase Plan.

 10.9**  Amended and Restated Stockholders' Agreement by and among the Company
         and the Stockholders identified therein, dated January 25, 1999.+

 10.10** Form of Warrant Agreement to purchase Series A Preferred Stock (with
         schedule of holders attached).

 10.11** Form of Warrant Agreement to purchase Common Stock (with schedule of
         holders attached).

 10.12** Form of Warrant Agreement to purchase Common Stock (with schedule of
         holders attached).

 10.13** Multi-Tenant Office R&D Building Lease by and between the Company and
         Sycamore/San Diego Investors, dated September 24, 1996.

 10.14** Master Lease Agreement by and between the Transamerica Business Credit
         Corporation and the Company, dated April 4, 1997.

 10.15   License Agreement between the Company and The Dow Chemical Company,
         dated July 20, 1997 and July 22, 1997.+

 10.16   Collaborative Research Agreement by and between the Company and The
         Dow Chemical Company, dated July 20, 1999 and July 22, 1999.+

 10.17** License Agreement by and between the Company and Finfeeds
         International Limited, dated December 1, 1998.+

 10.18** Collaboration Agreement by and between the Company and Novartis
         Agribusiness Biotechnology Research, Inc., dated January 25, 1999, as
         amended.+

 10.19** Stock Purchase Agreement by and between the Company and Novartis
         Agribusiness Biotechnology Research, Inc., dated January 25, 1999.+
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
 NUMBER
 EXHIBIT                         DESCRIPTION OF DOCUMENT
 ------- ----------------------------------------------------------------------

 <C>     <S>
 10.20** Collaboration Agreement by and between the Company and Rhone-Poulenc
         Animal Nutrition S.A., dated June 28, 1999.+

 10.21** License Agreement by and between the Company and Invitrogen
         Corporation, dated March 29, 1999.+

 10.22** License Agreement by and between the Company and Mycogen Corporation,
         dated December 1997, as amended on March 6, 1998 and December 19,
         1997.+

 10.23** Patent Cross-License Agreement by and between the Company and Terragen
         Discovery Inc., dated November 18, 1999.+

 10.24** Joint Venture Agreement by and between the Company and Novartis Seeds
         AG, dated December 1, 1999.+

 10.25** Research Lease by and between the Company One Cell Systems, Inc.,
         dated February 16, 1999.

 10.26** Research and Development Agreement by and between the Company and
         Novartis Enzymes, Inc., dated December 1, 1999.+

 10.27** Employment Offer Letter to Patrick Simms, dated February 3, 1997.

 10.28** Employment Offer Letter to Jay Short, dated August 30, 1994.

 10.29** Employment Offer Letter to Karin Eastham, dated April 2, 1999.

 10.30** Employment Offer Letter to William H. Baum, dated July 31, 1997.

 10.31** Separation Agreement by and between the Company and Terrance J.
         Bruggeman, effective as of April 12, 1999.

 10.32** Separation Agreement by and between the Company and Kathleen H. Van
         Sleen, effective as of
         May 10, 1999.

 10.33** Letter Agreement with Jay M. Short, Ph.D., dated June 25, 1998.

 16.1**  Letter from PricewaterhouseCoopers LLP to the Securities and Exchange
         Commission, dated January 28, 2000.

 23.1    Consent of Ernst & Young LLP, Independent Auditors.

 23.2**  Consent of Cooley Godward LLP. Reference is made to Exhibit 5.1.

 24.1**  Power of Attorney.

 27.1    Financial Data Schedule.
</TABLE>
- --------
*  To be filed by amendment.
** Previously filed as an exhibit to this Registration Statement.

+  Confidential Treatment will be requested with respect to portions of this
   exhibit. Omitted portions will be filed separately with the Securities and
   Exchange Commission.

<PAGE>
                                                                   EXHIBIT 10.15

                                              Confidential Treatment Requested
                                           Under 17 C.F.R. (S)(S) 200.80 (b) (4)
                                                    200.83 and 230.406


                               LICENSE AGREEMENT


                                    BETWEEN



                           THE DOW CHEMICAL COMPANY



                                      AND



                              DIVERSA CORPORATION




                                               *Confidential Treatment Requested


                                       1
<PAGE>

<TABLE>
<CAPTION>
      ARTICLE                                  TITLE                                  PAGE NUMBER
- -------------------------------------------------------------------------------------------------
<C>                                         <S>                                              <C>
 I                                          DEFINITIONS                                         1
- -------------------------------------------------------------------------------------------------
 II                                     PATENT LICENSE GRANT                                    4
- -------------------------------------------------------------------------------------------------
 III                                          PAYMENTS                                          6
- -------------------------------------------------------------------------------------------------
 IV                                        PATENT RIGHTS                                        9
- -------------------------------------------------------------------------------------------------
 V                                        CONFIDENTIALITY                                      11
- -------------------------------------------------------------------------------------------------
 VI                                          ASSIGNMENT                                        12
- -------------------------------------------------------------------------------------------------
 VII                              THIRD PARTY INFRINGEMENT CLAIMS                              12
- -------------------------------------------------------------------------------------------------
 VIII                             PATENT ENFORCEMENT & LITIGATION                              13
- -------------------------------------------------------------------------------------------------
 IX                         U.S. EXPORT CONTROL AND GOVERNMENT LICENSES                        14
- -------------------------------------------------------------------------------------------------
 X                             PRODUCT LIABILITY AND INDEMNIFICATION                           15
- -------------------------------------------------------------------------------------------------
 XI                                    WARRANTY & DISCLAIMER,                                  16
- -------------------------------------------------------------------------------------------------
 XII                                    TERM AND TERMINATION                                   17
- -------------------------------------------------------------------------------------------------
 XIII                                      FORCE MAJEURE                                       18
- -------------------------------------------------------------------------------------------------
 XIV                                     DISPUTE RESOLUTION                                    19
- -------------------------------------------------------------------------------------------------
 XV                                           NOTICES                                          20
- -------------------------------------------------------------------------------------------------
 XVI                                  MISCELLANEOUS PROVISIONS                                 21
- -------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
        APPENDIX                                TITLE                                        PAGE
- -------------------------------------------------------------------------------------------------
 <C>                                         <S>                                            <C>
 A                                         PATENT RIGHTS                                       A
- -------------------------------------------------------------------------------------------------
 A-1                                   DIVERSA PATENT RIGHTS                                  A-1
- -------------------------------------------------------------------------------------------------
 A-2                               DIVERSA PATENT RIGHTS [****]                               A-2
- -------------------------------------------------------------------------------------------------
</TABLE>

                                       i

<PAGE>
<TABLE>
<CAPTION>
                                                ROYALTY BEARING PRODUCTS
- --------------------------------------------------------------------------------------------------------------------
<C>                                                 <S>                                                   <C>
 A-3                                            DIVERSA PATENT RIGHT [****]                               A-3
- --------------------------------------------------------------------------------------------------------------------
 B                                                  JOINT PATENT RIGHTS                                   B-1
- --------------------------------------------------------------------------------------------------------------------
 C                                                   LICENSED PRODUCT                                     C-1
- --------------------------------------------------------------------------------------------------------------------
 D                                                ROYALTY BEARING PRODUCT                                 D-1
- --------------------------------------------------------------------------------------------------------------------
 E                                        ROYALTY BEARING PRODUCT CLASSIFICATION                          E-1
- --------------------------------------------------------------------------------------------------------------------
 F                                                   ROYALTY SCHEDULE                                     F-1
- --------------------------------------------------------------------------------------------------------------------
 G                                                   OPTION AGREEMENT                                     G-1
- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                                      ii

<PAGE>

     This LICENSE AGREEMENT (including the Appendices hereto, the "License") is
by and between THE DOW CHEMICAL COMPANY, a corporation duly formed and existing
under the laws of the State of Delaware, having a place of business at 2030 Dow
Center, Midland, Michigan 48674, United States of America ("DOW" or a "Party"),
and DIVERSA CORPORATION, a corporation duly formed and existing under the laws
of the State of Delaware, having a place of business at 10665 Sorrento Valley
Road, San Diego, California 92121, United States of America ("DIVERSA" or a
"Party").


                                R E C I T A L S

A.   DIVERSA has discovered and developed enzymes and has expertise in the
     rearrangement of DNA to produce and discover genes utilizing proprietary
     technologies for the rapid discovery, development and optimization of
     enzymes.

B.   DOW has expertise in the discovery, development and production of chemical
     compounds.

C.   DOW and DIVERSA are concurrently with this License entering into a separate
     Collaborative Research and Development Agreement ("Agreement") in order to
     perform research together to discover and optimize the function of new
     genes, processes and products resulting thereupon that can be used by DOW
     to produce certain, desired commercial chemical compounds.

D.   DIVERSA represents that it has Patent Rights and Know-How that pertain to
     this License.

E.   DOW is desirous of obtaining, and DIVERSA wishes to grant to DOW, a
     worldwide, exclusive royalty-bearing license to use Patent Rights and
     Licensed Products in Research Target Processes.

NOW, THEREFORE, in consideration of the mutual covenants contained herein, and
for other good and valuable consideration, the Parties hereby agree as follows:


                                   ARTICLE I

                                  DEFINITIONS
                                  -----------

When used in this License, the following terms shall have the meanings set out
below, unless the context requires otherwise.  The singular shall be interpreted
as including the plural and vice versa, unless the context clearly indicates
otherwise.

                                       1
<PAGE>

1.1  "Affiliate" means any corporation, firm, limited liability company,
     partnership or other entity that directly or indirectly controls or is
     controlled by or is under common control with a Party to this License.
     Control for this purpose means ownership, directly or through one or more
     affiliated entities, of 50 percent (50%) or more of the shares of stock
     entitled to vote for the election of directors in the case of a
     corporation, or 50 percent (50%) or more of the equity interests in the
     case of any other type of legal entity, or any other arrangement whereby a
     Party controls or has the right to control the board of directors or
     equivalent governing body of a corporation or other entity.

1.2  "Agreement" means the Collaborative Research Agreement between DOW and
     DIVERSA, executed concurrently with this License.

1.3  "Areas of Interest" means the development of Improved Enzymes (as defined
     below) for use in the following [****] specific areas:
     (a)   [****]
     (b)   [****]
     (c)   [****]

1.4  "Confidential Information" means all information, Know-How, scientific,
     technical, or non-technical data, samples and Materials, business plans,
     and marketing and sales information disclosed by one Party to the other
     under this License, and including information disclosed under the Agreement
     regarding Licensed Products, whether disclosed or provided in oral, written
     (including but not limited to electronic, facsimile, paper or other means),
     graphic, photographic or any other form, except to the extent that such
     information:
           (a)   as of the date of disclosure is known to the receiving Party as
                 shown by written documentation, other than by virtue of a prior
                 confidential disclosure from the disclosing Party to the
                 receiving Party;
           (b)   as of the date of disclosure is in, or subsequently enters, the
                 public domain through no fault or omission of the receiving
                 Party;
           (c)   as of the date of disclosure or thereafter is obtained from a
                 Third Party free from any obligation of confidentiality; or
           (d)   as of the date of disclosure or thereafter is developed by the
                 receiving Party independent of the disclosure by the disclosing
                 Party as evidenced by written documentation.

1.5  "Controls" or "Controlled" means, with respect to intellectual property,
     possession by DIVERSA (other than by virtue of this License) of the ability
     to grant licenses or sublicenses to DOW without violating the terms of any
     agreement or other arrangement with any Third Party and to the reasonable,
     good faith knowledge and belief of DIVERSA, without violating the rights of
     a Third Party.

                                               *Confidential Treatment Requested
                                       2
<PAGE>

1.6  [****] means a [****] that is not [****] whereupon the [****] shall be
     [****] on the [****] and [****] of the [****] including a [****] of [****]
     an [****].

1.7  "Effective Date" means the date of last signature of the Parties at the end
     of this License.

1.8  "Field" means [****]

1.9  "Improved Enzyme" means an enzyme or enzymes, either ex vivo or in vivo,
     provided to DOW by DIVERSA which is within the claims of Patent Rights or
     Joint Patent Rights or that incorporates, is derived from, or is
     identified, discovered, developed or made through the use of Know-How,
     which is developed in the Areas of Interest under the Agreement.

1.10 "Joint Patent Rights" means patent rights, which are jointly developed or
     invented by both Parties under the Agreement in accordance with its terms,
     as shown in Appendix B, which Appendix B-1 may be modified to include joint
     patent rights obtained during the Research Term under the Agreement, and
     which rights pertain to a Licensed Product. Joint Patent Rights concern
     only the scope of the claims that have not been held invalid or
     unenforceable after all appeals have been exhausted. Claims shall be deemed
     valid unless held otherwise.

1.11 "Know-How" means all Research Results, as defined and obtained under the
     Agreement, and all know-how, nonpatented inventions, improvements,
     discoveries, data, instructions, processes, formulas, sequences,
     information (including, without limitation, chemical, physical and
     analytical, safety, manufacturing and quality control data and
     information), procedures, devices, methods and trade secrets which are
     conceived, discovered or invented during the term of the Agreement, and
     which are necessary or appropriate to develop and commercialize Licensed
     Products. (Know-How does not include inventions within the Patent Rights or
     Joint Patent Rights.)

1.12 "Licensed Product" means (i) any Improved Enzyme which is used to convert a
     Research Target (as defined in the Agreement) into a product using a
     Research Target Process, or (ii) any Improved Enzyme which is based on or
     incorporates or is identified, discovered, or developed under the
     Agreement, for which both (i) and (ii) are designated by the RMC, and
     encompassed

                                               *Confidential Treatment Requested
                                       3
<PAGE>

     within DIVERSA Patent Rights or Joint Patent Rights and listed on Appendix
     C, which is attached hereto and made a part hereof and which is identical
     to Appendix G of the Agreement.

1.13 "Material" means the original, tangible materials of any type provided by
     DOW or DIVERSA to the other Party in order that the recipient can perform
     its obligations under this License.

1.14 "Net Sales" means the amount invoiced on sales of Royalty Bearing Product
     by DOW and its Affiliates to a Third Party, less the following deductions
     to the extent included in the amounts invoiced:
           (a)  [****] and
           (b)  [****] and
           (c)  [****] and
           (d)  [****] and
           (e)  [****]

     Net Sales shall not include sales between or among DOW and its Affiliates.

1.15 "Patent Rights" means patent and patent applications Controlled solely by
     DIVERSA as shown in Appendix A, including:
     (a)   all patents and patent applications which are conceived of under the
           Agreement, and which are necessary (but for this License DOW would
           infringe these patents) for DOW to make, use or sell the Royalty
           Bearing Products; and are listed on Appendix A-1, attached hereto and
           made a part hereof, which Appendix A-1 may be modified to include
           Patent Rights obtained during this License;
     (b)   the patents and patent applications listed on Appendix A-2, attached
           hereto and made a part hereof, are patent rights of DIVERSA that
           [****] and
     (c)   any divisions, continuations, continuations-in-part, reissues,
           reexaminations, extensions or other governmental actions which extend
           any of the subject matter of the patent applications or patents in


                                               *Confidential Treatment Requested

                                       4
<PAGE>

           (i) or (ii) above, and any substitutions, confirmations, patents-of-
           addition, registrations or revalidations of any of the foregoing,
           which Patent Rights are necessary (but for this License DOW would
           infringe these patents) for DOW to make, use or sell the Royalty
           Bearing Products, which shall be listed on Appendix A-1 or A-2,
           respectively;
     (d)   [****]

     in each case, which are Controlled by DIVERSA. All patents and patent
     applications subject to this definition are listed on Appendix A or will be
     included on Appendix A as they are developed or obtained under the
     Agreement and this License. Patent Rights concern only the scope of the
     claims that have not been held invalid or unenforceable after all appeals
     have been exhausted. Claims shall be deemed valid unless held otherwise.

1.16 "Royalty Bearing Product" means the material resulting from the application
     of a Licensed Product or a Licensed Product in a Research Target Process
     (defined in the Agreement), which shall be classified by its Royalty
     Bearing Product Classification and listed in Appendix D, attached hereto
     and made a part hereof. (If DIVERSA manufactures for DOW a Licensed Product
     using an in vivo Improved Enzyme, it shall be subject to a separate
     agreement.)

1.17 "Royalty Bearing Product Classification" means the [****] in accord with
     Appendix E, as attached hereto and made a part hereof. The Royalty Bearing
     Product [****]

1.18 "Royalty Schedule" means the [****] Royalty Bearing Product, as determined
     by the [****] read from the [****] on Appendix F, attached hereto and made
     a part hereof.

1.19 "Territory" means the world.

1.20 "Third Party" means anyone other than DOW or DIVERSA, or their respective
     Affiliates.

                                               *Confidential Treatment Requested

                                       5
<PAGE>

                                  ARTICLE II

                             PATENT LICENSE GRANT
                             --------------------

2.1  Grant of License to DOW - Subject to the terms and conditions of this
     License, DIVERSA hereby grants to DOW, and DOW hereby accepts:
     (a)   an a exclusive, royalty-bearing, worldwide license, including the
           right to grant sublicenses pursuant to Section 2.4, under the DIVERSA
           Patent Rights and Joint Patent Rights to make, have made, import,
           have imported, use, have used, sell, have sold and otherwise exploit
           Royalty Bearing Products;
     (b)   an exclusive, world-wide license, including the right to grant
           sublicenses pursuant to Section 2.4, under DIVERSA's enzymes [****]
           to use enzymes to convert Research Target(s) into products via
           Research Target Processes (Research Target and Research Target
           Processes are defined as in the Agreement). The royalty for this
           grant is obtained by DIVERSA under (a);
     (c)   a non-exclusive, royalty-bearing, world-wide license to [****] and
     (d)   a royalty-free license to any Know-How required to exploit the rights
           granted under (a), (b), and (c), and for DOW or its Affiliates to
           perform research on any Improved Enzyme.

2.2  Grant of Right to DIVERSA - If DOW desires that any Licensed Product be
     further modified after DIVERSA supplies it to DOW under the terms of the
     Agreement, then DOW may request that:
     (a)   DIVERSA perform such added modification under the Agreement, if it is
           still in effect; or
     (b)   if the Agreement is no longer in effect, then using good faith, the
           Parties shall negotiate terms consistent with the intent of obtaining
           a Licensed Product; or
     (c)   if DIVERSA declines to do such modification within thirty (30) days
           or an agreement is not reached within three (3) months having terms
           similar to the Agreement and providing for the work to commence
           within thirty (30) days of the signature date, [****]


                                               *Confidential Treatment Requested

                                       6
<PAGE>

     Notwithstanding the above, [****] if (i) a transfer or sale of
     substantially all of the business of DIVERSA to which this License relates
     occurs, whether by merger, sale of stock, sale of assets or otherwise, to a
     [****] or (ii) bankruptcy, insolvency, dissolution or winding up of DIVERSA
     (other than dissolution or winding up for the purposes of reconstruction or
     amalgamation). [****].  DOW would continue to pay DIVERSA for any Royalty
     Bearing Product under this License.

2.3  Grant of Rights to Use Licensed Products for New Research Targets within
     the Field after Termination of the Agreement - In the event DOW desires to
     obtain exclusive or non-exclusive rights to Licensed Products to make, have
     made, use, sell, offer for sale and import products in new Research Targets
     within the Field, DIVERSA and DOW agree to negotiate such rights in good
     faith, subject to any prior obligations DIVERSA has regarding the granting
     of said rights. If DIVERSA becomes aware of new Research Targets for
     Licensed Products within the Field, then DIVERSA shall notify DOW of such
     Licensed Product application, and [****]. If DOW declines to negotiate a
     license and DIVERSA and a Third Party desire to use a Licensed Product for
     a new Research Target, DIVERSA and DOW agree to negotiate for DIVERSA to
     pay DOW royalties on net sales of such Licensed Product in such Research
     Target consistent with the royalties DOW pays to DIVERSA under this License
     as indicated in Table 1 of Appendix F attached hereto.

2.4  Sublicensing - The exclusive license granted under Section 2.1(a) to DOW
     includes the right to sublicense Third Parties, whether or not Affiliates
     of DOW, including the right to enter into distributor contracts,
     manufacturing contracts, or other commercial transactions, including but
     not limited to sublicensing a competitor of DOW. DOW will be responsible
     for all payments due to DIVERSA as a result of any sublicensee and
     Affiliate Net Sales in the Field in the Territory. DOW will be responsible
     for the observance by all sublicensees of all applicable provisions of this
     License and will use its reasonable good faith efforts to cause all
     sublicensees to observe the covenants in this License (i.e., regarding
     confidentiality, maintaining records, reporting Net Sales, and governmental
     regulations). All sublicenses, other than a label license for DOW Net
     Sales, shall be in writing. DOW shall notify DIVERSA in writing within
     thirty (30) days of the grant of any


                                               *Confidential Treatment Requested

                                       7
<PAGE>

     sublicense hereunder. Notwithstanding the foregoing, DOW shall have no
     right under any circumstances to sublicense any rights to the DIVERSA
     Patent Rights listed on Appendix A-3, and licensed to DOW hereunder.

2.5  Reservations by DOW - DOW reserves the right to work with Third Parties
     outside the Areas of Interest, or after the Agreement terminates within the
     Areas of Interest, or to conduct its own research within the Areas of
     Interest.

2.6  Ex vivo Improved Enzyme Production - If DOW chooses not to exclusively
     manufacture a Licensed Product, DIVERSA shall be given a right of first
     refusal to manufacture such Licensed Product. DIVERSA must submit a bid
     which is competitive with any other Third Party supplier. Any bid received
     by DIVERSA shall be held confidential by DOW. If DIVERSA is the lowest
     cost, most effective producer of the Licensed Product, DOW and DIVERSA
     shall negotiate in good faith a separate manufacturing agreement for
     DIVERSA to provide the relevant Licensed Product to or on behalf of DOW.
     Such agreement may include the development of additional technology for
     such production. If such an agreement is negotiated, it shall contain at a
     minimum terms for a worldwide, non-exclusive license for the Know-How and
     any Patent Rights required (whether under this License in Appendix B-2 or
     developed separately). This [****].

2.7  Prior Option Agreement - DOW exercised its rights under a prior Option
     (copy attached for reference as Appendix H) for a license to a precursor
     for an Improved Enzyme and paid DIVERSA the exercise fee. This License
     shall also be a grant to the technology and the precursor Improved
     Enzyme(s) developed under that Option in the same manner for a Licensed
     Product.



                                  ARTICLE III

                                   PAYMENTS
                                   --------

3.1  Milestone Payment for Option under Section 2.7 - To meet the milestone
     payment due DIVERSA under the Option in accord with Section 2.7, DOW shall
     pay DIVERSA Two Hundred Thousand Dollars ($200,000) within thirty (30) days
     from the Effective Date. This License shall suffice for the exercise of the
     Option for a license.

                                               *Confidential Treatment Requested

                                       8
<PAGE>

3.2  License Product Nomination - When an Improved Enzyme is identified by the
     RMC under the Agreement as being adequately developed for
     commercialization, then DOW must inform DIVERSA in writing within sixty
     (60) days whether such Improved Enzyme shall become a Licensed Product
     under this License. If DOW desires to designate an Improved Enzyme as a
     Licensed Product, then it shall be listed on either Appendix C or D under
     the terms of this License and classified by DOW under the Royalty Bearing
     Product Classification of Appendix E as to which Royalty Schedule applies
     in accord with Appendix F. Up to three (3) Improved Enzymes per Royalty
     Bearing Product can be designated as Licensed Product(s). Within [****] of
     designation of more than one Improved Enzyme as a Licensed Product, DOW
     will select [****] Licensed Product for each Royalty Bearing Product, and
     all other Licensed Product(s) shall revert to Improved Enzyme status. If
     DOW does not designate an Improved Enzyme as a Licensed Product, then
     DIVERSA may license such Improved Enzyme to a Third Party for other than
     any Research Target without further obligation to DOW, unless Section 3.8
     applies.

3.3  License Fees - Within thirty (30) days of the identification by the RMC of
     a Licensed Product in accordance with Section 3.2, DOW shall pay to DIVERSA
     a license fee of [****] dollars. Only [****].

3.4  Commercialization Fees - Within thirty (30) days of the first commercial
     sale by DOW of each Royalty Bearing Product from a commercial scale plant,
     DOW shall pay to DIVERSA [****] dollars. Only [****].

3.5  Royalty Payments - Royalties owed for each Royalty Bearing Product are
     subject to Section 4.8 and shall vary according to Table 1 in the Royalty
     Schedule set forth on Appendix F. Upon pilot plant evaluation for each
     Royalty Bearing Product, DOW will propose to DIVERSA the Royalty Bearing
     Product Classification and specific royalty from Table 1 in the Royalty
     Schedule in Appendix F. DIVERSA and DOW shall discuss the proposal. The
     proposal shall be subject to DIVERSA approval, which shall not be
     unreasonably withheld. In the [****].


                                               *Confidential Treatment Requested

                                       9
<PAGE>

3.6  Method of Payment - All payments due under this License shall be made in
     with the respective sections of Article III by check or by bank wire
     transfer in immediately available funds to a bank account designated in
     writing to DOW by DIVERSA. In the event that the due date of any payment
     subject to this Article III hereof is a Saturday, Sunday or national
     holiday, such payment may be paid on the following business day. Any late
     payments shall bear interest, to the extent permitted by applicable law, at
     the prime rate (as reported by the Bank of America, San Francisco,
     California or its successor bank) on the date such payment is due plus two
     (2%) percent, calculated on the number of days such payment is delinquent.
     The rights provided in this Section 3.6 shall in no way limit any other
     remedies available to DIVERSA hereunder.

3.7  Sublicense Payments - Any sublicense agreement for Royalty Bearing Product
     shall contain royalty provisions that at a minimum provide for the payment
     of the same running royalty as would similarly be paid to DIVERSA by DOW in
     accord with Section 3.5. DOW will be responsible for any auditing for
     performance for similar terms and conditions by a sublicensee.

3.8  [****].

3.9  [****].

3.10 Exchange Rate and Payment - Royalty payments shall be paid to DIVERSA in US
     dollars in funds to be deposited in a US account as instructed in writing
     by DIVERSA in accordance with Section 3.6. If DOW receives payment on
     Royalty Bearing Products in currency other than US dollars, such payments
     shall be converted to US dollars on the last day of the calendar quarter
     using an exchange rate established by a leading New York bank, such as
     CitiBank, and published in The Wall Street Journal, but are not due for
     sixty (60) days from the last day of each calendar quarter for each Royalty
     Bearing Product.


                                               *Confidential Treatment Requested

                                      10
<PAGE>

     If DOW receives payment in a form other than a currency, it shall be
     estimated at its fair market value and converted to U.S. dollars.

3.11 Quarterly Royalty Reports and Payments - Within sixty (60) days after the
     close of each calendar quarter, DOW shall submit a report on the Net Sales
     on Royalty Bearing Product for the Territory in sufficient detail to enable
     a calculation of the royalty due in accord with Article III and payment of
     the royalty (if any) due. The quarterly reports will also specify the
     calculations based on Sections 3.7 and 3.10, Royalty Bearing Product
     Classifications made, the royalty rate from Table 1 of the Royalty Schedule
     in Appendix F for a given Royalty Bearing Product, and identification of
     any Licensed Products that are returned as Improved Enzymes.

3.12 Books of Account - DOW shall maintain true and complete books of account
     containing an accurate record of all data necessary for the proper
     computation of royalty payments due from it or on behalf of any Affiliate.
     Such records shall be maintained for at least five (5) years after the date
     of the pertinent royalty payment.

3.13 Audit Right - DIVERSA shall have the right through a firm of independent
     public accountants to whom DOW has no reasonable objection, to examine the
     books of account of DOW at reasonable times within three (3) years after
     the end of the calendar year to which they relate (but not more than once
     in each calendar year) for the purpose of verifying the correctness of any
     report concerning payment of royalties under Article III. Such examination
     shall be made during normal business hours at the place of business of DOW.
     The information provided as a result of any such examination shall be
     maintained in confidence on the terms specified in Article V. The fees and
     expenses of such an audit shall be borne by DIVERSA, unless such audit
     discloses an underpayment of more than five percent (5%) of the amount due
     under this License. In such case, DOW shall bear the full cost of such
     audit. If any such audit shows any underpayment or overcharge, a correcting
     payment or credit against future royalties shall be made. Any payment
     required from DOW to DIVERSA from such audit shall be made within thirty
     (30) days of DIVERSA's receipt of the auditors' statement. DOW shall be
     subject to a penalty as if the payment were deemed late in accord with
     Section 3.6.

3.14 Withholding Tax Payments - If any taxes for DIVERSA's account, withholding
     or otherwise, are levied by any taxing authority in the Territory in
     connection with the receipt by DIVERSA of any amounts payable under Article
     III of this License according to any tax treaty or agreement between the
     United States and any country in the Territory, then DOW shall have the


                                       11
<PAGE>

     right to pay such taxes to the local tax authorities and the payment to
     DIVERSA shall be the net amount due after reduction by the amount of such
     taxes, together with
           (a)   evidence of payment of such taxes and a translation thereof
                 into English,
           (b)   indication of the amount of such tax paid, and
           (c)   indication of the country in the TERRITORY and the authority to
                 whom it was paid, and
           (d)   other information required for DOW to comply with DOW's royalty
                 reporting obligations under this License.




                                  ARTICLE IV

                                 PATENT RIGHTS
                                 -------------

4.1  DIVERSA to Maintain Patent Rights - DIVERSA shall have the obligation and
     be responsible at its own cost and expense for prosecuting the patent
     applications in Patent Rights for maintaining and extending those Patent
     Rights for the term of this License. DIVERSA shall use good faith efforts
     to prosecute, issue and maintain all Patent Rights.

     DIVERSA shall supply DOW with a copy of all Patent Rights applications,
     their published texts, and issued patents. Where available a translation
     into English shall be provided.

4.2   Joint Patent Rights -
      In those instances where joint inventors (as defined by 35 U.S.C. et seq.)
      between DOW (or its Affiliate) and DIVERSA (or its Affiliate) result in a
      patentable invention, then DOW and DIVERSA shall mutually determine, using
      their good faith efforts:
           (a)   whether DOW or DIVERSA shall file a patent application;

           (b)   whether the patent application has joint ownership and joint
                 claim structure; and

           (c)   which Party should prosecute the patent application and pay the
                 annuities.

     Thus DOW shall have joint ownership rights to such Joint Patent Rights in
     accord with Article II. If either Party desires exclusive rights to Joint
     Patent Rights, then such Party must notify the other and both Parties shall
     negotiate in good faith. Should such joint inventorship arise, then the
     Parties shall discuss in good faith how the costs are shared, which Party
     should file the Joint Patent Rights, where the Joint Patent Rights should
     be



                                       12
<PAGE>

     filed, and, if term extension or restoration is available, who should
     extend the patent. DIVERSA shall use its reasonable good faith efforts to
     obtain the Joint Patent Rights and secure the broadest scope reasonably
     possible in view of the commercial intent of DOW.

     Each Party shall supply the other Party with a copy of all joint patent
     applications, their published texts, and issued patents included in the
     Joint Patent Rights under its control and their official actions and shall
     advise the other Party on the content of any responses. Where available a
     translation into English shall be provided.

4.3  Notice of Patent Lapse of Patent Rights and Joint Patent Rights -DIVERSA
     shall promptly advise DOW of the grant, lapse, nullification, revocation,
     surrender, or invalidation of any of the Patent Rights and Joint Patent
     Rights under its control at least in advance of any abandonment to enable
     DOW to assume that prosecution, at DOW's expense, should DOW not agree to
     such abandonment. If under these facts, DOW succeeds in issuing the Patent,
     then patent costs shall be credited against royalty payments. DOW shall
     promptly advise DIVERSA of the grant, lapse, nullification, revocation,
     surrender, or invalidation of any of the Joint Patent Rights under its
     control at least in advance of any abandonment to enable DIVERSA to assume
     that prosecution, at DIVERSA's expense, should DIVERSA not agree to such
     abandonment.

4.4  Validity, Non-Infringement - DIVERSA does not warrant that the manufacture,
     use and sale of Licensed Products do not fall within the scope of Third
     Party patents or the industrial property rights of a Third Party. However,
     to the best of DIVERSA's knowledge, information and belief, that as of the
     Royalty Bearing Product Classification, the [****] for the [****] does not
     fall within the scope of Third Party patents which are not owned or
     licensed by DIVERSA.

4.5  Disclaimer of Warranties as to Patent Rights - Other than as stated in
     Section 4.4, DIVERSA makes no representation that the inventions covered in
     any Patent Rights are patentable or that the Patent Rights are or will be
     valid or enforceable, nor does DIVERSA warrant or represent that the
     exercise of the rights licensed hereunder is free of infringement of patent
     rights of Third Parties.

4.6  Hold Harmless - [****] agrees to hold [****] harmless for patent
     infringement under [****]


                                               *Confidential Treatment Requested

                                       13
<PAGE>

     which may be [****] under this License so long as this License is in effect
     and is not terminated.

4.7  Cooperation - DIVERSA and DOW shall use good faith efforts to cooperate
     with respect to any issues that concern the development of the Licensed
     Product under this License. DOW is aware that competition in the Territory
     is likely if no Patent Rights or Joint Patent Rights exist or are obtained,
     and DOW accepts this License with that knowledge. DIVERSA shall promptly
     inform DOW of any references of which DIVERSA becomes aware which might
     significantly impact the scope of the Patent Rights or Joint Patent Rights
     or dominate Patent Rights or Joint Patent Rights.

4.8  Patent Rights Issues - DOW [****] owes DIVERSA under Article III for
     Royalty Bearing Products made using Licensed Products [****] DIVERSA agrees
     that it [****]


4.9  Country list for Global Filing Issues - DIVERSA shall file all Patent
     Rights at least in the US and PCT [****]

4.10 DOW technology and patents - DOW may develop and patent technology in the
     Field or Areas of Interest during this License. DOW does not need to pay
     any royalty to DIVERSA on such technology or patents unless it is dominated
     by any DIVERSA patents. [****]



                                   ARTICLE V

                                CONFIDENTIALITY
                                ---------------

5.1  Efforts - Each Party shall use good faith efforts to retain in confidence
     and not disclose to any Third Party each other's Confidential Information


                                               *Confidential Treatment Requested

                                       14
<PAGE>

     disclosed pursuant to the terms of this License. Such "good faith efforts"
     shall mean the same degree of care, but no less than a reasonable degree of
     care, as the receiving Party uses to protect its own Confidential
     Information of a like nature. All Confidential Information initially
     received in a non-written form shall be reduced to writing within thirty
     (30) days by the disclosing Party and such writing provided to the
     receiving Party. The receiving Party shall not be obligated if such writing
     is not received timely. DOW shall continue to use the same good faith
     efforts with respect to the DIVERSA Confidential Information already in its
     possession under the Agreement. Each Party may use Confidential Information
     of the other Party only to the extent required to accomplish the purposes
     of this License.

5.2  Notwithstanding the provisions of Section 5.1, if the receiving Party
     becomes legally compelled to disclose any of the disclosing Party's
     Confidential Information, the receiving Party shall promptly advise the
     disclosing Party of such required disclosure in order that the disclosing
     Party may seek a protective order confidential treatment or such other
     remedy as the disclosing Party may consider appropriate in the
     circumstances. The receiving Party shall disclose only that portion of the
     Confidential Information which it is legally required to disclose. Such a
     disclosure shall not release the receiving Party with respect to the
     Confidential Information so disclosed except to the extent of permitting
     the required disclosure.

5.3  Disclosure to Affiliates, Contractors - DOW may disclose Confidential
     Information to its Affiliates, sublicensees, consultants, contractors
     (parties under contract with DOW for the custom manufacturing or shipping
     of Royalty Bearing Product or obtention of registration in the Territory),
     as may be necessary to exercise the rights granted hereunder and to
     register and prepare for commercialization of Royalty Bearing Product, and
     to commercialize Royalty Bearing Product under this License, under
     conditions of confidentiality at least as stringent as those set out in
     Article V.

5.4  Survival of Confidentiality - Termination of this License for any reason
     shall not relieve the Parties of their obligations under Article V. The
     provisions of Article V shall survive termination of this License for ten
     (10) years.

                                       15
<PAGE>

                                  ARTICLE VI

                                  ASSIGNMENT
                                  ----------

6.1  DOW - DOW shall have the right to assign its rights in this License (or any
     part hereof) to an Affiliate: provided, however, that DOW shall continue to
     be responsible for the obligations of any such Affiliate. DOW may assign
     its rights hereunder in connection with the transfer or sale of all or
     substantially all of the business of DOW to which this License relates,
     whether by merger, sale of stock, sale of assets or otherwise.


6.2  DIVERSA - DIVERSA shall have the right to assign its rights in this License
     (or any part hereof) to an Affiliate: provided, however, that DIVERSA shall
     continue to be responsible, using its reasonable best efforts, for the
     obligations of any such Affiliate, including honoring the terms of this
     License. DIVERSA may assign its rights hereunder in connection with the
     transfer or sale of all or substantially all of the business of DIVERSA to
     which this License relates, whether by merger, sale of stock, sale of
     assets or otherwise.



                                  ARTICLE VII

                        THIRD PARTY INFRINGEMENT CLAIMS
                        -------------------------------

7.1  Defense of Third Party Patent Claims - If a claim is brought by a Third
     Party that the manufacture, use or the sale of a Royalty Bearing Product in
     the Territory (regardless of use) infringes a patent of such Third Party,
     DOW will give prompt written notice to DIVERSA of such claim if it concerns
     Patent Rights or Joint Patent Rights. The Parties shall confer in accord
     with Section 7.2.


7.2  Mutual Decisions - From the Effective Date and using their good faith
     efforts, DIVERSA and DOW shall discuss any claim or suit brought by a Third
     Party for patent infringement and mutually evaluate whether that Third
     Party's patent is infringed by the manufacture, use or sale of Royalty
     Bearing Product by DOW or its Affiliates in the Territory. Specifically,
     DIVERSA and DOW shall mutually try to agree on:


                                       16
<PAGE>

           (a)   the strategy for such suit or claim, e.g. whether to negotiate
                 a settlement, sue or withdraw selling Royalty Bearing Product
                 from the country in the Territory in which infringement is
                 claimed;

           (b)   the basis to be determined for sharing the costs of litigation,
                 damages awarded, and royalty to be paid to the Third Party.
                 [****].

           (c)   which Party should conduct the defense or if both DIVERSA and
                 DOW should jointly defend; and the consequences of such
                 decisions, such as amendment to this License with regard to
                 royalties due to DIVERSA.

7.3  Third Party License - The Parties shall use their good faith efforts
     (either individually or together) to [****]. As of the Royalty Bearing
     Product Classification, DIVERSA is not aware of the need for any such Third
     Party license.



                                 ARTICLE VIII

                        PATENT ENFORCEMENT & LITIGATION
                        -------------------------------

8.1  Prosecution by DIVERSA -

     8.1.1  DIVERSA, at its sole discretion, may take action on its own behalf
            and expense to institute any action or proceeding by reason of
            infringement of any of the Patent Rights related to a Royalty
            Bearing Product. If either Party learns of any infringement of
            Patent Rights by a Third Party, it shall promptly notify the other
            Party. DIVERSA shall have the first right, at its own expense, to
            prosecute all litigation against a Third Party infringer. DOW shall
            provide all reasonable cooperation, including any necessary use of
            its name required to prosecute such litigation. DOW shall be
            consulted concerning the litigation. DIVERSA gets to [****].

     8.1.2  If the possible infringement concerns a Licensed Product for the
            Research Target that is [****] then DIVERSA shall [****] and removal
            from the market place of all infringing


                                               *Confidential Treatment Requested

                                      17
<PAGE>

            Third Party products. DIVERSA will bear the costs and shall be
            entitled to any recovery obtained from such litigation, settlement
            or compromise thereof. If DIVERSA elects not to take action for such
            infringement, then DOW may do so at DOW's expense and shall be
            entitled to any recovery obtained from such litigation, settlement
            or comprise thereof and DOW retains all damages received.

     8.1.3  If the infringement of the Licensed Product is in areas that are
            [****] then DIVERSA shall [****]

     8.1.4  If a Patent Right is finally declared invalid or unenforceable in a
            judicial or administrative proceeding from which no appeal is or can
            be taken, then from and after that date with respect to that Patent
            Right in that country of the Territory, [****] If no other Patent
            Right is providing protection in that country of the Territory, then
            [****]

8.2  Neither Party Defends - If neither DIVERSA nor DOW will defend the Patent
     Rights in a particular country in the Territory, then for that Patent
     Rights in that country the royalty under Article III is [****] upon that
     decision.

8.3  Joint Patent Rights Suits - If the litigation concerns Joint Patent Rights,
     then both DIVERSA and DOW shall mutually work together and divide equally
     any recovery, but each shall pay their own costs.

8.4  Settlement - Any settlement of an infringement suit, whether brought by DOW
     or by DIVERSA, shall be subject to the consent of both Parties, which
     consent shall not be unreasonably withheld.

8.5  Cooperation - Each Party shall cooperate with the other Party to the extent
     reasonably requested in any legal action:
     (i)    brought by a Third Party against one Party; or
     (ii)   brought by a Third Party against both Parties; or
     (iii)  taken against a Third Party by either Party regarding Patent Rights
            or Joint Patent Rights in the Field in the Territory, and each Party
            shall have the right to participate in any defense, compromise or
            settlement to the extent that, in its judgment, it may be prejudiced
            thereby.


                                               *Confidential Treatment Requested

                                       18
<PAGE>

     In addition, DOW shall not settle any claim or suit in any manner that
     shall adversely affect any Patent Rights or Joint Patent Rights, require
     any payment by DIVERSA or reduce the royalty due to DIVERSA hereunder
     without the prior written consent of DIVERSA.


                                  ARTICLE IX

                   EXPORT CONTROL AND GOVERNMENT REGULATIONS
                   -----------------------------------------


9.1  Compliance by DIVERSA - DIVERSA agrees to comply with all governmental
     regulations for shipping Improved Enzyme, whether in vivo or in vitro, to
     DOW or any regulation for safety of the culture.

9.2  Compliance by DOW - DOW agrees to comply with all necessary United States,
     European and other country's governmental regulations in the Territory with
     respect to export of Know-How and any Royalty Bearing Product. DOW agrees
     to not export or re-export any Know-How or Royalty Bearing Product received
     from DIVERSA or the direct products of such technology to any prohibited
     country listed in the U.S. Export Administration Regulations (15 C.F.R.
     (S)700 et seq.) unless properly authorized by the U.S. Government.


9.3  Clearances - DOW agrees to obtain all necessary clearances from any
     government in the Territory for export or re-export with respect to the
     Know-How or Royalty Bearing Product.


                                   ARTICLE X

                     PRODUCT LIABILITY AND INDEMNIFICATION
                     -------------------------------------


10.1 Indemnity by DIVERSA - DIVERSA shall indemnify and hold DOW, its agents,
     directors, officers, employees and Affiliates harmless from and against any
     and all liabilities, claims, demands, damages, costs, expenses or money
     judgments (including reasonable attorneys' fees and expenses) incurred by
     or rendered against any of them for personal injury, sickness, disease or
     death or property damage which directly arise out of:
     (a)   the intentional misconduct or negligence of DIVERSA; or

                                       19
<PAGE>

     (b)   the breach by DIVERSA of its representations, warranties or
           agreements given in this License; or
     (c)   any activity carried out with Licensed Product by DIVERSA other than
           through DOW and its Affiliates under this License or other written
           agreements between the Parties;
     provided, however, that DOW shall give DIVERSA notice in writing as soon as
     practicable of any such claim or lawsuit and shall permit DIVERSA to
     undertake the defense thereof (including the right to settle the claim
     solely for monetary consideration)at DIVERSA's expense.  However,
           (i)   DOW will cooperate in such defense by providing access to
                 witnesses and evidence available to it. DOW shall have the
                 right to participate in any defense to the extent that in its
                 judgment, DOW may be prejudiced thereby; and
           (ii)  in any claim or suit in which DOW seeks indemnification by
                 DIVERSA, DOW shall not settle, offer to settle or admit
                 liability or damages in any such claim or suit without the
                 prior written consent of DIVERSA.


10.2 Indemnity by DOW - DOW shall defend, indemnify and hold DIVERSA and its
     Affiliates, and their respective agents, directors, officers, and employees
     harmless from and against any and all losses, liabilities, claims, demands,
     damages, costs, expenses or money judgments (including reasonable
     attorneys' fees and expenses) incurred by or rendered against any of them
     for personal injury, sickness, disease or death or property damage which
     arise out of
     (i)   the [****] of Royalty Bearing Product by DOW or its Affiliates,
           except for those instances provided in Section 10.1 for which DIVERSA
           is obligated to indemnify DOW; or
     (ii)  the breach by DOW of any of its representations, warranties or
           covenants contained in this License or any agreement contemplated by
           the terms of this License; or
     (iii) the intentional misconduct or gross negligence of DOW;

     provided, however, that DIVERSA shall give DOW notice in writing in accord
     with Article XV as soon as practicable of any such claim or lawsuit and
     shall permit DOW to undertake the defense thereof at DOW's expense.
     However,
     (i)   DIVERSA will cooperate in such defense by providing access to
           witnesses and evidence available to it. DIVERSA shall have the right
           to participate in any defense to the extent that in its judgment,
           DIVERSA may be prejudiced thereby; and
     (ii)  In any claim or suit in which DIVERSA seeks indemnification by DOW,
           DIVERSA shall not settle, offer to settle or admit liability or
           damages in any such claim or suit without the prior written consent
           of DOW.

                                               *Confidential Treatment Requested

                                       20
<PAGE>

                                  ARTICLE XI

                            WARRANTY AND DISCLAIMER
                            -----------------------


11.1 Belief of Accuracy - DIVERSA represents that the [****] and any [****]
     transferred or provided to DOW hereunder are believed to be accurate and
     complete as of their then current status at DIVERSA at the date when the
     Licensed Product is added to Appendix C or D or as of the Effective Date
     and that DIVERSA's interpretations and conclusions drawn therefrom were
     made in good faith and in the exercise of DIVERSA's scientific judgment as
     of the dates of the documents contained therein, and that to the best of
     DIVERSA's knowledge, data subject to regulations is in compliance with such
     regulations.

11.2 Reliance - DOW represents that it will be solely relying on its own
     evaluation of the Licensed Product and the other Confidential Information
     transferred or provided to it hereunder and on its scientific expertise in
     using the same in its development and commercialization of Royalty Bearing
     Product.

11.3 Mutual Representations - DIVERSA and DOW each represents and warrants as
     follows:

     11.3.1  Organization - It is a corporation duly organized, validly existing
             and is in good standing under the laws of the jurisdiction of its
             incorporation, is qualified to do business and in good standing as
             a foreign corporation in each jurisdiction in which the performance
             of its obligations hereunder requires such qualification and has
             all requisite power and authority, corporate or otherwise, to
             conduct its business as now being conducted, to own, lease and
             operate its properties and to execute, deliver and perform this
             License.

     11.3.2  Authorization - The execution, delivery and performance by it of
             this License have been duly authorized by all necessary corporate
             action and do not and will not: (a) require any consent or approval
             of its stockholders or (b) violate any provision of any law, rule,
             regulation, order, writ, judgment, injunction, decree,
             determination or award presently in effect having applicability to
             it or any provision of its charter documents.

     11.3.3  Binding Agreement - This Agreement is a legal, valid and binding
             obligation of it, enforceable against it in accordance with its
             terms and conditions.

                                               *Confidential Treatment Requested

                                      21
<PAGE>

     11.3.4  Warranty Disclaimer - EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN
             THIS License, NEITHER Party MAKES ANY REPRESENTATION OR WARRANTY OF
             ANY KIND, EXPRESS OR IMPLIED, WITH RESPECT TO ANY Confidential
             Information, Patent Rights, Know-How, Improved Enzymes, Licensed
             Products, OR OTHER TECHNOLOGY, GOODS, SERVICES, RIGHTS OR OTHER
             SUBJECT MATTER OF THIS License AND HEREBY DISCLAIMS ANY WARRANTY OF
             MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-
             INFRINGEMENT, OR VALIDITY OF TECHNOLOGY OR PATENT CLAIMS, ISSUED OR
             PENDING, WITH RESPECT TO ANY AND ALL OF THE FOREGOING.

     11.3.5  Limited Liability - EXCEPT AS EXPRESSLY PROVIDED HEREIN, NEITHER
             DIVERSA NOR DOW WILL BE LIABLE TO THE OTHER PARTY WITH RESPECT TO
             ANY SUBJECT MATTER OF THIS License UNDER ANY CONTRACT, NEGLIGENCE,
             STRICT LIABILITY OR OTHER LEGAL OR EQUITABLE THEORY FOR (i) ANY
             SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES OR
             LOST PROFITS OR (ii) COST OF PROCUREMENT OF SUBSTITUTE GOODS,
             TECHNOLOGY OR SERVICES.


                                  ARTICLE XII

                              TERM AND TERMINATION
                              --------------------


12.1 Term - Unless terminated under the provisions of this Article XII, this
     License shall continue in full force and effect until the expiration of the
     last to expire Patent Rights and Joint Patent Rights listed on Appendices A
     and B, subject to the survivorship clause Section 12.7.

12.2 [****]

                                               *Confidential Treatment Requested


                                       22
<PAGE>

12.3  Termination by DOW - DOW may surrender and terminate this License on three
      (3) months written notice to DIVERSA, either for specific Royalty Bearing
      Products or this License as a whole. DOW will disclose to DIVERSA its
      reasons for any such termination. It is understood that upon evaluation
      for commercialization some Royalty Bearing Products may be re-designated
      as Licensed Products and also that some Licensed Products may be re-
      designated as Improved Enzymes.

12.4  Termination by DIVERSA - DIVERSA shall have the further right to terminate
      this License immediately, but separately on each Royalty Bearing Product,
      on written notice to DOW if:
      (a)  DOW shall cease to carry on business or a receiver shall be
           appointed to DOW's assets; or
      (b)  DOW fails to meet any of its payments in accord with Article III;
           however, DOW shall be entitled to a period of sixty (60) days from
           the delivery of a notice of failure to pay in which to remedy or to
           undertake to remedy the same; or
      (c)  DOW breaches any material provision (e.g., Sections 2.2 and 2.4) of
           this License and has not cured such breach within thirty (30) days
           after written notice thereof by DIVERSA.

12.5  On Termination - DOW shall, upon termination of this License by DIVERSA
      under Section 12.4, termination by DOW under Section 12.3, or termination
      by either Party under Section 12.8:
      (a)  pay to DIVERSA all payments and royalties due or accrued at the
           termination date within thirty (30) days after termination; and
      (b)  make no further use of any kind of any and all Know-How and
           Confidential Information of DIVERSA disclosed hereunder by DIVERSA,
           except to the extent such information has become public knowledge
           other than through fault of DOW, and make no further use of the
           surviving Patent Rights.

12.6  Effect of Termination.
      (a)  Upon termination of this License, all rights to the DIVERSA
           Intellectual Property as defined in the Agreement shall revert to
           DIVERSA; and
       (b) Within thirty (30) days following the termination of this License,
           but separately on each Royalty Bearing Product, each party shall
           return to the other Party, or destroy, upon the written request of
           the other Party, any and all Confidential Information of the other
           Party in its possession; and
      (c)  Expiration or termination of this License shall not relieve the
           Parties of any obligation accruing prior to such expiration or
           termination.

                                       23
<PAGE>

12.7  Survival of [****] - On termination of this License: the obligations of
      confidentiality set forth in Article V shall survive for the time stated
      therein; Export Control compliance set forth in Article IX shall survive;
      and the indemnification obligations set forth in Article X and third party
      infringement claims set forth in Article VII shall also survive as to all
      claims or actions arising from events which occurred before termination.
      Article XIV shall survive termination of this License so long as any
      disputes arising prior to such termination exist.

12.8  Bankruptcy - If either Party (the "Insolvent Party") files for protection
      under bankruptcy laws, makes an assignment for the benefit of creditors,
      appoints or suffers appointment of a receiver or trustee over its
      property, files a voluntary petition under any bankruptcy or insolvency
      act or has any such petition filed against it which is not discharged
      within 60 days of the filing thereof, then the other Party may, at its
      sole election upon notice to the Insolvent Party, terminate this License
      by written notice under Section 15.1.

      All rights and licenses granted under or pursuant to this License shall be
      deemed to be, for purposes of Section 365(n) of the US Bankruptcy Code,
      licenses or rights to "intellectual property" as defined under Section
      101(52) of the US Bankruptcy Code. The Parties agree that each Party, as a
      licensee of such rights under this License, shall retain and may fully
      exercise all of its rights and elections under the US Bankruptcy Code,
      subject to performance by the licensee of its preexisting obligations
      under this License.


                                  ARTICLE XIII

                                 FORCE MAJEURE
                                 -------------

13.1  Event of Force Majeure - In the event that performance under this License,
      or any obligation hereunder, is hindered, delayed or prevented by reason
      of acts of God, strikes, lockouts, labor troubles, intervention of any
      governmental authority, fire, riots, insurrections, invasions, war or
      other reason of similar nature beyond the reasonable control of the Party
      and are without its fault or negligence, then performance of that act
      shall be excused for the period of the delay and the period for the
      performance of that act shall be extended for an equivalent period.

13.2  Notification. Upon occurrence of an event of force majeure, the affected
      Party shall promptly notify the other Party in writing, setting forth the
      nature of the occurrence, its expected duration and how that Party's
      performance is affected.

                                               *Confidential Treatment Requested

                                       24
<PAGE>

      The affected Party shall resume the performance of its obligations as soon
      as practicable after the force majeure event ceases.


                                  ARTICLE XIV

                               DISPUTE RESOLUTION
                               ------------------


14.1  Choice of Law - This License shall be governed by the laws of the State of
      Delaware, excepting its conflict of laws principles, in all respects of
      validity, construction and performance, except that all questions
      concerning the construction, validity, coverage or infringement of Patent
      Rights or Joint Patent Rights shall be decided in accordance with the
      patent law of the country where the patent was granted.

14.2  Disputes - Both Parties shall make good faith efforts to resolve any
      questions concerning construction and performance under this License,
      excluding Patent Rights and antitrust issues, by:

      14.2.1  Notice, contact and negotiation, all proceedings and documents in
              English, between the Parties listed under Article 15.1 within one
              hundred twenty (120) days from the date of the notice by
              negotiation either by telephone or by meeting in Denver, CO; and

      14.2.2  If unsuccessful under Article 14.2.1, then senior executive
              management with settlement authority and counsel of DOW and
              DIVERSA shall meet at a mutually agreeable location within sixty
              (60) days from a date of notice that Article 14.2.1 failed to
              resolve the issues. Counsel shall present the legal and factual
              arguments to such executives in English, with supporting evidence
              if necessary, and resolution by these executives is expected
              within ten (10) days, which may be reduced to writing in English
              as an amendment to this License; and

      14.2.3  If such executives have not met or resolved the issues under
              Article 14.2.2, then within seventy five (75) days from the date
              of the notice under Article 14.2.1, the Parties shall submit the
              issues to mediation in Chicago, IL, in English, in accordance with
              the Rules of the American Arbitration Association ("AAA"), which
              may be modified by the Parties, and judgment shall not be binding.
              The Parties agree that the following procedures shall be adhered
              to even though they may, in part, not be in full conformance with
              said Rules:

              (a)  Three Mediators shall be selected from a list of at least 20
                   arbitrators selected by the AAA composed of counsel with


                                       25
<PAGE>

           chemistry, molecular biology or pharmaceutical expertise who are
           practicing or retired partners in law firms or in-house corporate
           counsel not affiliated with the Parties with at least 15 years of
           experience in law and knowledge of the pertinent laws of any country
           relevant to the dispute. The mediation proceedings and reports shall
           be in English. The time from the beginning of submission for
           mediation and conclusion of any oral or written proceedings shall not
           exceed six (6) months; and
      (b)  Limited discovery to only that which each Party has a substantial,
           demonstrable need, and shall be conducted in the most expeditious and
           cost-effective manner. The Mediators shall resolve any issues with
           regard to the discovery. Decision by the Mediators shall be given in
           writing within thirty (30) days from the end of oral proceedings; and
      (c)  The decision by the Mediators is binding, but should either Party
           then need to have a Court of competent jurisdiction for the Parties
           enforce the decision, either Party may introduce into court the
           decision reached by Mediation with its supporting evidence.


                                  ARTICLE XV

                                    NOTICES
                                    -------



15.1  Official -Any notice, request or communication specifically provided for
      or permitted to be given under this License must be in writing and may be
      delivered by hand delivery, overnight courier service, or electronic
      transmission such as facsimile, and shall be deemed effective as of the
      time of actual delivery thereof to the addressee.  For purposes of notice
      the addresses of the Parties shall be as follows:

      If to DIVERSA:

                Diversa Corporation
                10665 Sorrento Valley Road
                San Diego, California  92121

                        Attention:  Jay M. Short, PhD
                                    Chief Executive Officer


                                       26
<PAGE>

                                Telephone:  619-623-5135
                                Facsimile:  619-623-5180


      With a copy to:

           Diversa Corporation
           10665 Sorrento Valley Road
           San Diego, California  92121

                 Attention:     Carolyn Erickson
                                Director, Intellectual Property
                                Telephone:  619-623-5104
                                Facsimile:  619-453-9133

      If to DOW:

           The Dow Chemical Company
           Patent Department
           1790 Building, Washington Street
           Midland, Michigan  48674

                 Attention:     Karen L. Kimble
                                Senior Counsel

                                [****]


                                               *Confidential Treatment Requested

                                       27
<PAGE>

15.2  Development Issues - For purposes of commercial development reporting, the
      addresses of the Parties shall be as follows:


      If to DIVERSA:

              Diversa Corporation
              10665 Sorrento Valley Road
              San Diego, California  92121

                   Attention:  Jay M. Short, PhD
                               Chief Executive Officer

                               Telephone:  619-623-5135
                               Facsimile:  619-623-5180


      If to DOW:

              The Dow Chemical Company
              1707 Building, Washington Street
              Midland, Michigan 48674

                   Attention:  William Dowd
                               Biomaterials Platform Director

                               [****]

                                  ARTICLE XVI

                           MISCELLANEOUS PROVISIONS
                           ------------------------


16.1  Amendments - This License may be amended only in writing executed by both
      Parties.

16.2  Entirety of Agreement - This License together with the Agreement sets
      forth the entire agreement and understanding between the Parties hereto
      with respect to the commercialization of Royalty Bearing Products in the
      Territory.

16.3  Severability - If any term or provision under this License is deemed
      invalid under the laws of a particular country or jurisdiction, the
      invalidity shall not invalidate


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<PAGE>

      the whole License but it shall be construed as if not containing that
      particular term or provision and the rights and obligations of the Parties
      shall be construed and enforced accordingly. The Parties shall negotiate
      in good faith a substitute provision in compliance with the law to as
      nearly as possible retain the Parties intent in legally valid language.

16.4  Waivers, Cumulative Remedies - A waiver by either Party of any term or
      condition of this License in any one instance shall not be deemed
      construed to be a waiver of such term or condition for any similar
      instance in the future or of any subsequent breach hereof. All rights,
      remedies, undertakings, obligations and agreements contained in this
      License shall be cumulative and none of them shall be a limitation of any
      other remedy, right, undertaking, obligation or agreement of either Party.

16.5  Headings - Headings in this License are included herein for ease of
      reference and shall not affect the meaning of the provisions of this
      License, nor shall they have any other legal effect.

16.6  Other Documents - Each Party agrees to execute such additional papers or
      documents in customary legal form and to make such governmental filings or
      applications as may be necessary or desirable to effect the purposes of
      this License and carry out its provisions.

16.7  Publicity - Neither DOW nor DIVERSA shall make the financial terms of this
      License public, except as required by law or by mutual consent. Either
      Party may make such disclosure of the existence of this License to its
      attorneys, advisors, investors, prospective investors, leaders and other
      financing sources, under circumstances that reasonably ensure
      confidentiality. In the event that a filing of a copy of this License with
      the US Securities and Exchange Commission is required, then DIVERSA shall
      seek confidential treatment of information considered confidential by DOW
      and shall redact the financial and as much other information as possible.

      Any press release or publicity of this License shall be reviewed and
      approved by both Parties prior to any release. It is expected that a Q&A
      outline for use in responding to inquires about this License shall be
      prepared and used by both Parties. Thereafter both Parties may disclose
      the information contained in such press release and Q&A outline without
      the need for further approval. In no event shall the financial terms of
      this License be publicly disclosed, except as note in the first paragraph
      of Section 16.7.

                                      29
<PAGE>

      In addition, DIVERSA may make public statements regarding the Licensed
      Products by announcing in general terms that DOW has exercised its license
      to them.

16.8  Interpretation - DOW and DIVERSA acknowledge and agree that: (i) each
      Party and its counsel reviewed and negotiated the terms and provisions of
      this License and have contributed to its revision; (ii) the rule of
      construction to the effect that any ambiguities are resolved against the
      drafting Party shall not be employed in the interpretation of this
      License; and (iii) the terms and provisions of the License shall be
      construed fairly as to all Parties hereto and not in favor of or against
      any Party, regardless of which Party was generally responsible for the
      preparation of this License.

16.9  Counterparts - This License may be executed simultaneously in two (2) or
      more counterparts, each of which shall be deemed an original.

16.10 No Agency or Partnership - Nothing contained in this License shall give
      either Party the right to bind the other Party, or be deemed to constitute
      either Party as an agent for the other Party or as a partner with the
      other Party or any Third Party.

                                      30
<PAGE>

IN WITNESS WHEREOF, the Parties have caused this License to be executed in
duplicate originals as of the last signature date below, by their duly
authorized representatives. This License is intended to be signed concurrently
with the Agreement and shall not be effective until the Agreement has also been
executed by both Parties. Such License may be subject to management and/or Board
approval by each Party. Upon signature such Board approval is indicated to have
been obtained.


DIVERSA CORPORATION                          THE DOW CHEMICAL COMPANY


By ________________________                  By_________________________________

Name   Jay M. Short, PhD                     Name  Fernand Kaufmann

Title  Chief Executive Officer                      Title  Vice President
                                                    New Businesses and
                                                    Strategic Development

Date__________________________               Date______________________________


                                      31
<PAGE>

                                  Appendix A-3
                                  ------------

                    Diversa Patent Rights [****]

                                    [****]



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                                   Appendix E

                     Royalty Bearing Product Classification



Product Classifications:

The Royalty Bearing Product shall be classified according to the following
definitions:

       .  [****]

       .  [****]

       .  [****]



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                                   Appendix F
                                   ----------

Royalty Schedule

[****]

[****]

[****]

[****]

[****]

[****]


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[****]

[****]

[****]

[****]



<PAGE>

                               OPTION AGREEMENT

THIS option agreement (hereinafter "OPTION") is made between THE DOW CHEMICAL
COMPANY (hereinafter "DOW" or a "Party"), a corporation duly formed and existing
under the laws of the State of Delaware, having a place of business at 2030 Dow
Center, Midland, Michigan 48674, United States of America, and Recombinant
BioCatalysis Inc. (hereinafter "RBI" or a "Party"), a corporation duly formed
and existing under the laws of Delaware, having a place of business at 10665
Sorrento Valley Road, San Diego, CA 92121;

WITNESSETH:

WHEREAS, DOW possess an enzyme for use in a recycle process or with a reaction
coproduct produced by DOW; and

WHEREAS, DOW has proprietary rights in this enzyme and desires that the enzyme
be improved; and

WHEREAS, RBI desires to undertake the further evaluation of this enzyme under
the terms of this OPTION and, if RBI is able to improve on this enzyme, RBI is
willing to grant DOW an exclusive or non-exclusive license to such improvements;

WHEREAS, DOW desires to obtain an exclusive or non-exclusive, global license to
this improved enzyme; and

WHEREAS, RBI desires to supply DOW with such improved enzyme.

NOW, THEREFORE, DOW and RBI, in consideration of the mutual covenants contained
herein, agree as follows:

ARTICLE 1 - DEFINITIONS

When used in this OPTION, the following terms shall have the meanings set out
below, unless the context requires otherwise. The singular shall be interpreted
as including the plural and vice versa, unless the context clearly indicates
otherwise.

1.1  "AFFILIATE" means a corporation or any other entity that at any time during
     the term of this OPTION directly or indirectly through one or more
     intermediaries is CONTROLLED by the designated Party, but only for so long
     as the relationship exists. A corporation or other entity shall no longer
     be an AFFILIATE when through loss, divestment, dilution or other reduction
     of a Party's ownership, the Party loses CONTROL of such corporation or
     other entity.

1.2  "CANDIDATE ENZYMES" means those ENZYMES which meet the criteria of
     exhibiting initial hydrolysis rates (Vmax) significantly higher than the
     wild type (wt) recombinant ENZYME [*****].

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     [****]

1.3  "CDA" means a Confidential Disclosure Agreement between the Parties
     effective August 27, 1996, a copy attached hereto as Appendix E.

1.4  "CONFIDENTIAL INFORMATION" means any proprietary information of a Party
     that is submitted to the other Party hereunder, including, but not limited
     to PATENTS, JOINT PATENTS, ENZYME, sample of ENZYME, TECHNOLOGY, the FIELD,
     financial terms of this OPTION, business information of RBI or DOW and
     business development plans for an ENZYME.

1.5  "CONTROL" or "CONTROLLED" shall mean, in the case of a corporation,
     ownership or control, directly or indirectly, of more than fifty percent
     (50%) of the shares of stock entitled to vote for the election of directors
     and, in the case of an entity other than a corporation, ownership or
     control, directly or indirectly, of more than 50% of the assets or the
     ability in the case of either a corporate or non-corporate entity to direct
     the management and affairs of such entity.

1.6  "EFFECTIVE DATE" means June 30,1997.

1.7  "ENZYME" means any enzyme supplied by DOW to RBI for use under this OPTION
     in the FIELD, including TECHNOLOGY such as its amino acid or DNA sequence,
     or expression system; and any improvements to such enzyme (e.g., where the
     productivity of the enzyme is increased and/or where the product inhibition
     is lowered) when done by RBI.

1.8  "EVOLVED ENZYMES" means those ENZYMES which meet the criteria of exhibiting
     initial hydrolysis rates at least 6-fold that of the wild type (wt)
     recombinant ENZYME for a multiply halogenated organic molecule in aqueous
     buffer in the presence of the product as an inhibitor. Kinetically, an
     EVOLVED ENZYME is characterized as having a Vmax (at 100 mM of product) >
                                                                             -
     6.0 times Vmax (recombinant ENZYME at 0 mM of product).

1.9  "FIELD" means the use of ENZYME in a recycle process or with a reaction
     coproduct produced by DOW where the ENZYME [*****].

1.10 "IMPROVED ENZYMES" means those ENZYMES which meet the criteria of [*****].

1.11 "LETTER OF INTENT" means the agreement signed between DOW and RBI,
     effective May 27, 1997, a copy attached hereto for reference as Appendix A.

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1.12 "LICENSE" means a license agreement contemplated under Section 5.2 to be
     granted by RBI to DOW if, by no later than the end of the OPTION TERM, DOW
     notifies RBI in writing of its desire to exercise its rights to obtain a
     license.

1.13 "JOINT PATENTS" means those PATENTS in the FIELD which are jointly owned by
     and have claims present by employees of both DOW and RBI during the term of
     this OPTION and, if they exist, shall be listed in Appendix B, which shall
     be reviewed and updated [*****], to be attached hereto and made a part
     hereof.

1.14 "OPTION TERM" means until December 1, 1998 for an exclusive LICENSE and
     until January 31, 1999 for a non-exclusive LICENSE, unless extended in
     writing by the Parties.

1.15 "PATENTS" means all patent applications and patents to which RBI has rights
     which claim improvements to the ENZYME made by RBI (or other inventions,
     including but not limited to, apparatus, made by RBI in the course of
     performing work under the RESEARCH PLAN) during this OPTION TERM, together
     with any continuations, continuations-in-part, divisions, reissues,
     registrations, confirmations, patents-of -addition, and extensions of the
     foregoing, which claims cover the preparation, use or per se ENZYME in the
     TERRITORY, which shall be listed in Appendix C (such patents to be mutually
     agreed upon to be listed if regarding other inventions), to be attached
     hereto and made a part hereof, and reviewed and updated annually as of the
     EFFECTIVE DATE.

1.16 "PRODUCTIVITY ENZYMES" means those ENZYMES which meet the criteria of
     exhibiting at least [*****].

1.17 "RESEARCH PLAN" means a mutually agreed upon plan for RBI to perform
     research activities to improve ENZYME for commercial use to achieve TARGET
     ACTIVITY in the FIELD during the OPTION TERM in accord with Appendix D,
     attached hereto and made a part hereof.

1.18 "SIGNATURE DATE" means the date of the last signature of the Parties to
     this OPTION.

1.19 "TARGET ACTIVITY" refers to the Milestone [*****] target for the [*****].
     It is determined at the [*****] and projected from the Milestone 2 data to
     be sufficient for a [*****]. It is defined in terms of [*****].


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1.20 "TECHNOLOGY" means data for ENZYME, including for example physical
     properties, DNA sequence, Vmax and Ki and process to make them

1.21 "TERRITORY" means the world.

ARTICLE 2 - GRANT OF OPTION

2.1  Grant of OPTION - RBI hereby grants to DOW, and DOW hereby accepts either:

     (1)  an exclusive right during the OPTION TERM to acquire an exclusive
          LICENSE to make, have made, use, sell, import and have sold ENZYME(S)
          for the FIELD in the TERRITORY under the PATENTS, JOINT PATENTS and
          TECHNOLOGY and subject to Section 5.3; or

     (2)  a non-exclusive right during the OPTION TERM to acquire a nonexclusive
          LICENSE to make, have made, use, sell, import and have sold ENZYME(S)
          for the FIELD in the TERRITORY under the PATENTS, JOINT PATENTS and
          TECHNOLOGY and subject to Section 5.3.

Whether (1) or (2) above is selected is solely DOW's choice during the OPTION
TERM.

2.2  Reservation - DOW reserves for itself and its AFFILIATES the right to do
     internal research on ENZYMES (excluding any improvements to the ENZYMES
     made by RBI) within the FIELD during the OPTION TERM.

2.3  Expansion of FIELD - In the event that DOW wishes to expand the FIELD at
     the time of exercise of the LICENSE, the Parties agree to discuss in good
     faith the proposed expansion of the FIELD and the terms therefore.

2.4  Exercise of OPTION for LICENSE - DOW may exercise its rights under Section
     2.1 by providing written notice to RBI of its election under Section 2.1
     (1) or (2) on or before the last day of the OPTION TERM.

ARTICLE 3 - OPTION PAYMENTS

3.1  Initial Payment for OPTION - Within fifteen (15) business days from the
     EFFECTIVE DATE, DOW shall pay RBI [*****].

3.2  Additional Payments during OPTION TERM - The further payments to RBI by DOW
     are tied to the achievement of milestone technical events in accord with
     Article 4. DOW shall be invoiced one (1) month prior to any payment due to
     RBI for each of these milestones. The payments for each milestone are:

     3.2.1  Milestone 1 - [*****] - [*****], if RBI is technically successful as
          defined in Article 4; plus [*****], if RBI accomplishes this Milestone
          1 in less than [*****] from the date of receipt by RBI of [*****] from
          DOW;

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     3.2.2  Milestone 2 - [*****] - [*****], payable within [*****] of receipt
            by DOW of the ENZYME [*****] by DOW that RBI has provided DOW with
            [*****] (DOW shall use its reasonable good faith efforts to conclude
            such evaluation within [*****] the CANDIDATE [*****]); plus [*****],
            if RBI provides DOW with [*****] CANDIDATE ENZYMES and/or [*****]
            ENZYME [*****]; and

     3.2.3  Milestone 3 - [*****]

            (A)  [*****] payable within [*****] of receipt by DOW of the ENZYME
                 [*****] by DOW that RBI has provided DOW [*****]; plus

            (B)  [*****] payable within [*****] of receipt by DOW of the ENZYME
                 [*****] by DOW that RBI has provided DOW [*****] ENZYME (for
                 both (A) and (B) of this Section 3.2.3 DOW shall use its
                 reasonable good faith efforts to conclude such evaluations
                 [*****] of the ENZYMES), plus a bonus of -

                 (i)   [*****] if either of the criteria for (B) [*****] are met
                       within [*****] from the EFFECTIVE DATE, plus
                 (ii)  [*****] if the [*****] exceeds [*****], plus
                 (iii) [*****] if the [*****] exceeds [*****].

     It is agreed that if any of these milestones categories in Section 3.2 is
     surpassed by an ENZYME providing performance at a higher category that the
     payments for those surpassed categories will still be made.

     The [*****].

     These payments are tied to performance under the RESEARCH PLAN described in
     Article 4.

3.3  Payments to RBI - All payments under this Article 3 are to be made to:
     Recombinant BioCatalysis, Inc. and sent by wire transfer to:

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     Account Name: [*****].

ARTICLE 4 - ENZYME USE AND RESEARCH PLAN

4.1  RBI Obligations - RBI shall maintain sole physical control of the ENZYME
     which shall be treated as CONFIDENTIAL INFORMATION under the terms of
     Article 7 of this OPTION. RBI shall use any information provided to it by
     DOW solely to improve ENZYME in the FIELD. RBI shall provide a written
     report with a summary of the data to DOW on a quarterly basis or at a
     milestone achievement in accord with Section 4.3 in a quarter, whichever
     occurs first. (If clarification of a report is requested by DOW to more
     fully understand such report, then a meeting of respective personnel is
     permitted.) A final written report shall be provided of the results
     obtained by RBI on its improvement efforts for the ENZYME, including its
     sequence, within thirty (30) days at the end of the OPTION TERM or within
     thirty (30) days upon termination.

4.2  Development Efforts - During the OPTION TERM, RBI shall perform research
     activities to improve the ENZYME to achieve TARGET ACTIVITY in the FIELD in
     a diligent manner as specified in Article 3 and described in detail in a
     RESEARCH PLAN. Such improvement can be met by any manner acceptable to the
     Parties. The ENZYME is to be improved for commercial use in a manner agreed
     upon between the Parties. The RESEARCH PLAN may be amended by mutual,
     written consent of the Parties. However, either Party may terminate the
     research and this OPTION at any technical milestone specified in Section
     4.3 for any reason; but if RBI terminates, then DOW has thirty (30) days to
     notify RBI whether DOW desires either an exclusive or nonexclusive LICENSE
     in accord with Section 2.1 for the ENZYME until that termination. If DOW
     terminates the research and this OPTION and any of the milestones beyond
     Milestone 1 have been achieved and completed in accord with each milestone
     requirement in accordance with Section 4.3, then RBI shall have the rights
     described in Section 5.2.3.

4.3  Milestones -

     4.3.1  Milestone 1

            DOW completes preliminary [*****] and defines general parameters for
            the ENZYME, [*****]

            RBI develops of a suitable [*****].

     4.3.2  Milestone 2

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            RBI [*****] ENZYME by [*****] to obtain CANDIDATE ENZYME, transfers
            to DOW the [*****] CANDIDATE ENZYMES and [*****] of each CANDIDATE
            ENZYME.

            DOW confirms [*****] CANDIDATE ENZYMES and evaluates their
            performance attributes [*****].

            (DOW and RBI scientists shall discuss the relationship between
            [*****] in performance of the [*****] CANDIDATE ENZYME and
            improvement in productivity of the CANDIDATE ENZYME as a supported
            catalyst. After such discussions, the Parties shall mutually agree
            on [*****] i.e. TARGET ACTIVITY, prior to starting Milestone 3.)

     4.3.3  Milestone 3

            (A)  RBI increases productivity as stated in Article 3 for [*****]
                 ENZYMES and transfers [*****] of all such ENZYMES to DOW
                 together with each ENZYME's [*****]. DOW confirms [*****]
                 ENZYMES and evaluates their performance attributes [*****]. If
                 [*****] ENZYME [*****], then part (B) below shall occur.

           (B)   RBI [*****]as stated in Article 3 for [*****] ENZYMES and
                 transfers [*****] of [*****] ENZYMES to DOW together with each
                 ENZYME's [*****]. DOW confirms [*****] ENZYMES and evaluates
                 their performance attributes [*****].

4.4  RESEARCH PLAN and Payments are tied - The events under Section 4.3 for
     performance under the RESEARCH PLAN are tied to payments under Article 3.

4.5  DOW Obligations - DOW shall provide the assay mentioned in Section 4.3.1,
     Milestone 1, analytical information or know-how, including evaluation of
     the modified ENZYME at DOW facilities, the identity of the gene for the
     host interaction desired, and the DNA sequence of the gene. All information
     supplied by DOW to RBI shall be treated as confidential under Article 7.

ARTICLE 5 - LICENSE TERMS

The following terms are contemplated by the Parties to be included in a LICENSE
if, by no later than the end of the OPTION TERM, DOW exercises its right to such
LICENSE.

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5.1  Exercise Payment - Upon exercise of the right to a LICENSE, a payment shall
     be due to RIBI depending upon whether DOW elects rights under Section 2.1
     (1) or (2) as follows. If DOW elects Section 2.1 (1) for an exclusive
     LICENSE, then a one time fee of Two Hundred Thousand Dollars (US$200,000)
     Dollars is payable within thirty (30) days from exercise of the exclusive
     LICENSE but no sooner than December 1, 1998. If DOW elects Section 2.1(2)
     for a non-exclusive LICENSE, then terms shall be negotiated using
     reasonable good faith efforts by the Parties by January 31, 1999.

5.2  Exercise for LICENSE - The OPTION TERM shall be for the term of the
     Research Plan, including any mutually agreed upon extensions. At present
     both Parties agree that the OPTION TERM for an exclusive LICENSE shall run
     from the EFFECTIVE DATE until December 1, 1998 and for a nonexclusive
     LICENSE until January 31, 1999. In addition, DOW has eighteen (18) months
     from its receipt by DOW to evaluate the TECHNOLOGY and improved ENZYME
     provided by RBI before execution of the LICENSE.

     5.2.1  By the end of the OPTION TERM, DOW, at its sole discretion, may
            negotiate an exclusive LICENSE to the ENZYME and gene coding for the
            ENZYME in the FIELD from RBI, or purchase the ENZYME or immobilized
            ENZYME from RBI or an alternate supplier in accord with Section 5.3.
            Upon execution of the LICENSE, manufacturing licenses and terms of
            sale for any ENZYME shall be on commercially reasonable terms,
            mutually agreed upon, and shall include, without limitation,
            royalties and minimum payments (as negotiated by the Parties in good
            faith taking into account the value created by the respective
            contributions of the Parties, e.g., monetary, scientific and capital
            contributions). If DOW exercises the OPTION for a nonexclusive
            LICENSE, RBI shall also have the non-exclusive right to make, have
            made, use, sell, import, and have sold ENZYME for the FIELD in the
            TERRITORY under the PATENTS, JOINT PATENTS and TECHNOLOGY.

     5.2.2  In the event that the ENZYME is improved and DOW has had eighteen
            (18) months from the time the TECHNOLOGY and improved ENZYME was
            delivered to DOW in accord with Milestone 3(B) of Section 3.2.3 to
            test it, and DOW then provides written notice to RBI in accord with
            Section 12.1 of DOW's lack of interest in commercial use of the
            improved ENZYME provided by RBI, then, RBI shall have the rights
            described in Section 5.2.3.

     5.2.3  RBI Rights - Under the circumstances described in Sections 4.2 and
            5.2.2 and in the event that RBI terminates the OPTION in accord with
            Section 10.2 upon material breach by DOW, DOW shall have no LICENSE
            (but shall have the right for internal research use of ENZYME,
            TECHNOLOGY, PATENTS and JOINT PATENTS) and RBI shall have all
            commercial rights to make, have made, use, sell, import and have
            sold ENZYME for the FIELD in the TERRITORY under the PATENTS, JOINT
            PATENTS and TECHNOLOGY by notifying DOW in writing in accord with
            Section 12.1 and making the following payments (at RBI's sole
            option):



<PAGE>

            (A)  RBI shall pay DOW as a [****] fee for DOW's total investment in
                 the ENZYME (which fee shall be computed from the time of such
                 request by RBI, but in no event would be less than [****] Such
                 payment would be due to DOW within thirty (30) days from
                 invoice by DOW; or

            (B)  RBI agrees to pay to DOW reasonable royalty and payments for
                 all income received from RBI's commercialization or sale of the
                 TECHNOLOGY or PATENTS using the ENZYME. Such payments shall be
                 negotiated as an agreement by the Parties using their good
                 faith efforts.

RBI must elect between (A) and (B) within one hundred and eighty (180) days from
DOW's written notification of lack of interest and convey their election in
writing to DOW in accord with Section 12.1.

Any payments to DOW under this Section 5.2.3 shall be made to. The Dow Chemical
Company, and be sent by wire transfer to:

[*****].

5.3  Supply of ENZYME - In the event that the ENZYME is improved and is of
     further interest to DOW and DOW exercises its rights to a LICENSE under
     Section 2.1, then DOW shall have [****] from the time the improved ENZYME
     is delivered in a practicable form to DOW in accord with Milestone 3(B)
     under Section 4.3.3 (B) to provide written notice under Section 12.1 to RBI
     of DOW's intent to either:

     (A)   have RBI supply the improved ENZYME commercially to DOW. If this
           course is mutually agreed upon then a commercial agreement shall be
           negotiated using reasonable good faith efforts by the Parties; or

     (B)   inform RBI that DOW will use an alternate supplier (not RBI) for the
           improved ENZYME. RBI agrees to provide to a qualified third party
           under appropriate, reasonable licensing terms for the industry, the
           information and rights required to supply the ENZYME to DOW; or

     (C)   If DOW does not desire any commercial supply of the improved ENZYME,
           then refer to Section 5.2.2.

5.4  DOW Evaluation - DOW has the right, during the OPTION TERM and the [*****]
     evaluation period, for its purposes of evaluation only, to produce
     sufficient ENZYME for its needs.


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5.5  Other terms - Other customary and negotiated terms are expected to be
     included in the LICENSE and are permitted.

ARTICLE 6 - PATENT RIGHTS

6.1  RBI to Maintain PATENTS - Any improvements to the ENZYME made by RBI during
     this OPTION TERM shall belong to RBI, if within the claimed scope of any
     PATENT. DOW shall be informed of all such PATENTS and be provided with a
     copy thereof, and provided with their publication numbers or patent numbers
     and each country where filing was done. If requested by DOW, a completed
     file wrapper for a given application or patent shall be provided to DOW. An
     annual status of the concerned PATENTS shall be provided to DOW until all
     have issued or are abandoned. If DOW exercises its rights for a LICENSE,
     then rights to any PATENTS shall be granted in the LICENSE for the FIELD
     for the TERRITORY. If RBI obtains rights under Section 5.2.3, then such
     rights shall include rights to any PATENTS for the FIELD for the TERRITORY.

6.2  Notice of Patent Lapse - RBI shall advise DOW of the grant, lapse,
     nullification, revocation, surrender, or invalidation of any of the PATENTS
     at the annual update of the PATENT listing for Appendix C.

6.3  JOINT PATENTS - Although unlikely to occur, in those instances where joint
     inventions between DOW and RBI result in a patentable invention, then DOW
     and RBI shall mutually determine, using their good faith efforts, whether
     the patent application has joint ownership and joint claim structure, and
     which Party should prosecute the patent application and pay the annuities.
     Both Parties shall elect any countries in which filing shall be done. If
     DOW exercises its rights for a LICENSE, then rights to any JOINT PATENTS
     shall be granted in the LICENSE for the FIELD for the TERRITORY. If RBI
     obtains rights under Section 5.2.3, then such rights shall include rights
     to JOINT PATENTS for the FIELD for the TERRITORY.

6.4  TECHNOLOGY - TECHNOLOGY developed during the OPTION TERM or known as of the
     LETTER OF INTENT by either Party shall remain that Party's property. Any
     use by one Party of the other's TECHNOLOGY shall be under the
     confidentiality provisions of Article 7.

6.5  DOW Patents - No rights are granted by DOW to RBI to use any DOW
     intellectual property rights including patents (such as sole DOW patents),
     trade secrets, confidential information and computer programs, except in
     providing the contemplated services under the RESEARCH PLAN. If Section
     5.2.3 pertains, then rights to commercial use of the JOINT PATENTS and
     ENZYME are granted by DOW to RBI.

ARTICLE 7 - CONFIDENTIALITY

7.1  Each Party shall use good faith efforts to retain in confidence and not
     disclose to any third party each other's CONFIDENTIAL INFORMATION.  Such
     "good faith efforts" shall mean the same degree of care, but no less than a
     reasonable degree of care, as the receiving Party uses to protect its own
     CONFIDENTIAL INFORMATION of a like nature. This obligation shall be
     effective from August 29, 1996 upon the SIGNATURE

<PAGE>

     DATE and shall cease five (5) years from termination of this OPTION. This
     OPTION shall supersede the CDA upon the SIGNATURE DATE.

7.2  Excepted from the obligation of confidentiality under Section 7.1 is that
     information which:

     (a)   is available, or becomes available, to the general public without
           fault of the receiving Party; or

     (b)   is obtained by the receiving Party without an obligation of
           confidence from a third party (other than a governmental agency) who
           is rightfully in possession of such information and is under no
           obligation of confidentiality to the disclosing Party concerning such
           information; or

     (c)   is released from confidentiality in writing by the disclosing Party;
           or

     (d)   is permitted to be disclosed by Section 7.4.

For the purpose of Section 7.1, a specific CONFIDENTIAL INFORMATION shall not be
deemed to be within the foregoing exceptions merely because it is embraced by
more general information in the public domain, or in the possession of the
receiving Party. In addition, any combination of features shall not be deemed to
be within the foregoing exceptions merely because individual features are in the
public domain or in the possession of the receiving Party, but only if the
combination itself and its principle of operation and process to make it are in
the public domain or in the possession of the receiving Party.

7.3  Notwithstanding the provisions of Section 7.1, if the receiving Party
     becomes legally compelled to disclose any of the disclosing Party's
     CONFIDENTIAL INFORMATION, the receiving Party shall promptly advise the
     disclosing Party of such required disclosure in order that the disclosing
     Party may seek a protective order or such other remedy as the disclosing
     Party may consider appropriate in the circumstances. The receiving Party
     shall disclose only that portion of the CONFIDENTIAL INFORMATION which it
     is legally required to disclose. Such a disclosure shall not release the
     receiving Party with respect to the CONFIDENTIAL INFORMATION so disclosed
     except to the extent of permitting the required disclosure. In addition,
     the receiving Party may disclose CONFIDENTIAL INFORMATION of the disclosing
     Party to the extent such disclosure is reasonably necessary in connection
     with the filing or prosecution of JOINT PATENTS. If DOW CONFIDENTIAL
     INFORMATION is reasonably necessary to be disclosed in connection with the
     filing or prosecution of PATENTS, then DOW's prior written consent must be
     obtained in accord with Section 12.1.

7.4  Disclosure to AFFILIATES - RBI or DOW may disclose CONFIDENTIAL INFORMATION
     to its AFFILIATES, and consultants as may be necessary to exercise the
     rights granted hereunder, but only under conditions of confidentiality at
     least as stringent as those set out in Sections 7.1, 7.2 and 7.3.

7.5  Document Return - In the event of termination of this OPTION under Article
     10, without exercise of a LICENSE, then:

<PAGE>

     (a)   RBI will cease its use of the ENZYMES in accord with Section 10.3,

     and

     (b)   each Party will cease its use of all CONFIDENTIAL INFORMATION of the
           other Party provided hereunder and, on the disclosing Party's
           request, within sixty (60) days either return all such CONFIDENTIAL
           INFORMATION, including any copies thereof, ENZYMES in whatever media
           or form, or will promptly destroy the same and certify such
           destruction to the disclosing Party.

     Notwithstanding the above, a Party may retain one copy of any CONFIDENTIAL
INFORMATION of the other Party in its legal files, but shall return or destroy
any DOW samples of ENZYME or ENZYME provided by the other Party.  The foregoing
provisions shall not apply to RBI to the extent it exercises its rights under
Section 5.2.3.

ARTICLE 8 - U.S. EXPORT CONTROL AND GOVERNMENT LICENSES

8.1  Compliance - Both Parties agree to comply, at their expense, with all
     necessary United States governmental regulations with respect to export of
     ENZYMES and TECHNOLOGY in the TERRITORY. Both Parties agree to not export
     or re-export any ENZYME or TECHNOLOGY received from the other or the direct
     products of such TECHNOLOGY to any prohibited country listed in the U.S.
     Export Administration Regulations unless properly authorized by the U.S.
     Government. Each Party shall be responsible for the acts of its AFFILIATES,
     contractors, and consultants and assumes all liability if it or its
     AFFILIATES, fails to obtain any of the necessary licenses or commits any
     violations of the United States Export Laws or Regulations (15 C.F.R.
     (S)700 et seq.). Each Party shall indemnify the other for its acts and for
     any breach of compliance.

8.2  Licenses and Clearances - Both Parties agree to obtain all necessary
     licenses or clearances, at its expense, and to comply with all applicable
     regulations of agencies in the TERRITORY.

ARTICLE 9 - WARRANTY, DISCLAIMER, GUARANTEE

9.1  Belief of Accuracy - Each Party represent that ENZYME, TECHNOLOGY and any
     other CONFIDENTIAL INFORMATION transferred or provided to the other Party
     hereunder are believed to be accurate and complete as of their current
     status on the EFFECTIVE DATE and that each Party's interpretations and
     conclusions drawn therefrom were made in good faith and in the exercise of
     its scientific judgment as of the dates of the documents contained therein.
     However, neither Party warrants or represents that such information is or
     will be sufficient to market ENZYME or to commercially produce ENZYME, or
     to commercialize ENZYME in the TERRITORY or that DOW or RBI shall be free
     to practice or sell any ENZYME.

9.2  DOW Representation - DOW will be solely relying on its own evaluation of
     ENZYME, TECHNOLOGY and the other CONFIDENTIAL INFORMATION transferred or
     provided to it hereunder and on its own scientific expertise in using the
     same in its development and evaluation of ENZYME.



<PAGE>

9.3  Validity, Non-Infringement - No warranty is provided that the manufacture,
     use and sale of ENZYME falls outside the scope of third party patents or
     the industrial property rights of a third party.

9.4  Disclaimer of Warranties as to PATENTS - RBI makes no representation that
     the inventions covered in any PATENTS are patentable or that the PATENTS
     are or will be valid or enforceable, nor does RBI warrant or represent that
     the exercise of the rights hereunder is free from infringement of patent
     rights of third parties.

ARTICLE 10 - TERM AND TERMINATION

10.1 Term - Unless terminated under the provisions of this Article 10, this
     OPTION shall continue in effect until the end of the OPTION TERM, unless
     mutually agreed upon in writing by the Parties to be extended.

10.2 Termination for Breach - In the event of a material breach by either DOW or
     RBI of any of the obligations contained in this OPTION, the other Party
     shall be entitled to terminate this OPTION by notice in writing under
     Section 12.1, provided that such notice shall specify the breach or
     breaches. If the said breach or breaches are capable of remedy, the Party
     committing such breach or breaches shall be entitled to a period of sixty
     (60) days from the delivery of such notice in which to remedy or to
     undertake to remedy the same. In the case the defaulting Party shall fail
     to remedy the breach or to undertake to remedy the breach to the
     satisfaction of the injured Party, the injured Party shall have the right
     to cancel this OPTION in whole or only terminate those rights and
     obligations relating to the particular breach by simple notification to the
     Party in default. Failure of a Party to exercise its rights under this
     Section 10.2 shall not be construed as a waiver as to future breaches
     whether or not they are similar.

10.3 Termination by RBI or DOW - Either Party may terminate this OPTION at the
     end of any Milestone in Section 4.3 by written notice to the other. Each
     will disclose to the other its reasons for any such termination. Upon such
     termination, both Parties shall refrain from further use of CONFIDENTIAL
     INFORMATION received from the other Party, including ENZYME, except that
     this provision shall not apply to RBI if it exercises its rights under
     Section 5.2.3.

10.4 Termination by DOW - DOW shall have the further right to terminate this
     OPTION immediately on written notice to RBI if:

     (a)   RBI shall cease to carry on business or shall go into liquidation or
           a receiver shall be appointed to RBI's assets; or

     (b)   RBI shall become bankrupt or insolvent or unable to meet any of its
           performance obligations; or

     (c)   RBI fails to conduct testing on the ENZYMES for more than sixty (60)
           days from any Milestone.

10.5 On Termination - DOW shall, upon termination of this OPTION under Article
     10:



<PAGE>

     (a)   pay to RBI all payments due or accrued at the termination date within
           thirty (30) days after termination; and

     (b)   make no further use of, or permit any use by any third party of any
           kind of any and all ENZYMES disclosed hereunder by RBI, and make no
           further use of the surviving PATENTS in the FIELD.

10.6 Survival of Certain Obligations - On termination of this OPTION: the
     obligations of confidentiality set forth in Article 7 shall survive for the
     time stated therein; payments due under Article 3 shall survive for the
     terms specified; and Export Control compliance set forth in Article 8 shall
     survive indefinitely.

ARTICLE 11 - FORCE MAJEURE

11.1 Event of Force Majeure - In the event that performance under this OPTION,
     or any obligation hereunder, is hindered, delayed or prevented by reason of
     acts of God, strikes, lockouts, labor troubles, intervention of any
     governmental authority, fire, riots, insurrections, invasions, war or other
     reason of similar nature beyond the reasonable control of the Party and are
     without its fault or negligence, then performance of that act shall be
     excused for the period of the delay and the period for the performance of
     that act shall be extended for an equivalent period.

11.2 Notification. Upon occurrence of an event of force majeure, the affected
     Party shall promptly notify the other Party in writing, setting forth the
     nature of the occurrence, its expected duration and how that Party's
     performance is affected. The affected Party shall resume the performance of
     its obligations as soon as practicable after the force majeure event
     ceases.

ARTICLE 12 - NOTICES

12.1 Official -Any notice, request or communication specifically provided for
     or permitted to be given under this OPTION must be in writing and may be
     delivered by hand delivery, courier service, or electronic transmission
     such as telex, facsimile, or telegram, and shall be deemed effective as of
     the time of actual delivery thereof to the addressee. For purposes of
     notice the addresses of the Parties shall be as follows:

     DOW:
               The Dow Chemical Company
               2030 Dow Center
               Midland, Michigan
               48674
               USA

               Attention:  William Dowd
                           Director
                           Biocatalysis Laboratory

               [*****]


                                               *Confidential Treatment Requested
<PAGE>

     with a copy to:
               The Dow Chemical Company
               Patent Department
               1790 Building, Washington Street
               Midland, Michigan 48674
               USA
               Attention:  Karen L. Kimble, JD
                           Senior Counsel

               [*****]
     RBI:
               Recombinant BioCatalysis, Inc.
               10665 Sorrento Valley Road
               San Diego, CA 92121
               USA
               Attention:  Donald C. Garaventi
                           President

               [*****]

12.2 For purposes of scientific reporting, the Parties designate as their
     respective principle contacts:

     DOW:
               The Dow Chemical Company
               Building 1707
               Washington Street
               Midland, MI 48674
               USA

               Attention:  Joseph Affholter, PhD
                           Research Leader

               [*****]

     RBI:
               Recombinant BioCatalysis, Inc.
               10665 Sorrento Valley Road
               San Diego, CA 92121
               USA

               Attention:  Dan Robertson, PhD
                           Director of Enzymologys


                                               *Confidential Treatment Requested
<PAGE>

               [*****]

12.3 Each Party may change its address and its representative for notice by the
     giving of notice thereof in the manner provided in Section 12.1.

ARTICLE 13 - ASSIGNMENT

13.1 Assignment - Neither Party to this OPTION shall assign or sublicense any
     rights hereunder without the prior written consent of the other Party, such
     consent not to be unreasonably withheld. It being agreed, however, that
     without such consent being required from RBI, DOW may assign to its
     AFFILIATES, but RBI must be notified in writing in accord with Section
     12.1.

13.2 Consolidation, Reorganization or Merger - Should RBI be consolidated,
     reorganized or merged with another entity, this OPTION and all rights and
     obligations arising under this OPTION may be assigned to the successor
     entity or the assignee of all or substantially all of RBI's business and
     assets without DOW's prior written consent. However, RBI shall promptly
     notify DOW prior to such action in accord with Section 12.1.

Effect on Successors and Assignees - This OPTION shall inure to the benefit of
and be binding upon such successors and permitted assignees.

ARTICLE 14 - LIABILITY

14.1 DOW Liability to RBI - Neither DOW, any of its AFFILIATES, nor the
     respective agents, servants, officers, directors, and employees of each
     shall be liable to RBI, or RBI's employees, directors, officers, agents or
     legal heirs, for any personal injury, death, or property damage that occurs
     while RBI is performing under this OPTION, except to the extent such
     injury, death, or property damage is caused by the sole negligence of DOW.

14.2 RBI Liability to DOW - Neither RBI, any of its subsidiaries, nor the
     respective agents, servants, officers, directors, and employees of each
     shall be liable to DOW, or DOW's employees, directors, officers, agents or
     legal heirs, for any personal injury, death, or property damage that occurs
     while DOW is performing under the OPTION, except to the extent such injury,
     death, or property damage is caused by the sole negligence of RBI.

14.3 Safety by RBI - RBI personnel agree to observe the same safety and other
     rules required of DOW employees while RBI is on premises owned, operated,
     leased or under the control of DOW.

14.4 Safety by DOW - DOW personnel agree to observe the same safety and other
     rules required of RBI employees while LOW is on premises owned, operated,
     leased or under the control of RBI.

ARTICLE 15 - MISCELLANEOUS PROVISIONS


                                               *Confidential Treatment Requested
<PAGE>

15.1 Amendments - This OPTION may be amended only in writing executed by both
     Parties.

15.2 Disputes - Both Parties shall make good faith efforts to resolve any
     questions concerning construction and performance under this OPTION

15.3 Entirety of Agreement - This OPTION sets forth the entire agreement and
     understanding between the Parties hereto with respect to ENZYME for its
     evaluation in the TERRITORY for use in the FIELD. This OPTION shall be
     deemed to be in compliance with the LETTER OF INTENT and should any
     differences exist, this OPTION shall control.

15.4 Severability - If any term or provision under this OPTION is deemed
     invalid under the laws by a United States court of competent jurisdiction,
     the invalidity shall not invalidate the whole OPTION but it shall be
     construed as if not containing that particular term or provision for that
     particular country or jurisdiction and the rights and obligations of the
     Parties shall be construed and enforced accordingly. The Parties shall
     negotiate in good faith a substitute provision as an addendum to this
     OPTION for that particular country or jurisdiction in compliance with the
     law to as nearly as possible retain the Parties intent in legally valid
     language.

15.5 Waivers, Cumulative Remedies - A waiver by either Party of any term or
     condition of this OPTION in any one instance shall not be deemed construed
     to be a waiver of such term or condition for any similar instance in the
     future or of any subsequent breach hereof. All rights, remedies,
     undertakings, obligations and agreements contained in this OPTION shall be
     cumulative and none of them shall be a limitation of any other remedy,
     right, undertaking, obligation or agreement of either Party.

15.6 Publicity - Neither DOW nor RBI shall make the financial terms of this
     OPTION public, except as required by law. In the event that a filing of a
     copy of this OPTION with the US Securities and Exchange Commission is
     required, then RBI shall seek confidential treatment of information
     considered confidential by DOW. Any press release or publicity of this
     OPTION shall be reviewed and approved by both Parties prior to any release.

15.7 Choice of Law - This OPTION shall be governed by the laws of the State of
     Michigan, excepting its conflict of laws principles, in all respects of
     validity, construction and performance; except that all questions
     concerning the construction, validity, coverage or infringement of PATENTS
     or JOINT PATENTS shall be decided in accordance with the patent law of the
     country where the PATENT or JOINT PATENT was granted.

15.8 Headings - Headings in this OPTION are included herein for ease of
     reference and shall not affect the meaning of the provisions of this
     OPTION, nor shall they have any other legal effect.

15.9 Cooperation - RBI and DOW shall use good faith efforts to cooperate with
     respect to any issues that concern the development of the ENZYME under this
     OPTION.



<PAGE>

15.10 RBI's Status - RBI's status hereunder is that of an independent
      contractor, and not that of an agent of DOW. As such RBI is responsible of
      all Income Tax withholding and the payment of any other appropriate taxes
      on all payments to RBI by DOW.

IN WITNESS WHEREOF, the Parties have duly executed duplicate originals of this
OPTION by their appropriate authorized representative. Such OPTION may be
subject to management and/or Board approval by each Party. Separate signature
pages are acceptable in facsimile form and shall be accepted in lieu of original
signatures, provided each Party receives a dated, signed, legible facsimile
indicating the signator for the other Party. Upon the SIGNATURE DATE, this
OPTION shall be effective as of the EFFECTIVE DATE. If requested by either
Party, duplicate originals, bearing the same date as the facsimile signature or
in lieu of facsimile signatures may be provided.

THE DOW CHEMICAL COMPANY                RECOMBINANT BIOCATALYSIS, INC.

By:__________________________________   By:___________________________________
Name:  R.J. Pangborn                    Name:     T.J. Bruggeman
Title: Vice President                   Title:    CEO
       Central & New Businesses R & D

Date:________________________________   Date:_________________________________



<PAGE>

                                  APPENDIX A


May 27, 1997

Donald C. Garaventi
President
Recombinant BioCatalysis, Inc.
10665 Sorrento Valley Road
San Diego, CA 92121
USA

LETTER OF INTENT

Dear Mr. Garaventi:

The purpose of this Letter of Intent is to summarize the present arrangements
and intent between The Dow Chemical Company ("DOW") and Recombinant BioCatalysis
Inc. ("RBI") for use of an enzyme provided by DOW. The Parties intend to
negotiate an option agreement ("Option") encompassing this intent.

RBI and DOW shall negotiate in good faith to result in an Option having at least
the following terms and conditions:

1.   Option Territory - The Option shall be for the world.

2.   Permitted Use by RBI - RBI shall use any information provided to it by DOW
     solely to improve an enzyme identified by DOW for use in recycle process or
     with a reaction coproduct produced by DOW [*****]. [This enzyme and any
     improvements thereto (e.g., where the productivity of the enzyme is
     increased and/or where the product inhibition is lowered) are referred to
     as "Enzyme".]

3.   Option Grant - The Option, if DOW requests an exclusive grant for the Field
     to make, have made, use, sell, import and have sold the Enzyme for the
     Field in the Territory, shall include the patents and technology on the
     Enzyme in the Field subject to the terms of the Option and any
     manufacturing license agreement. The fee for this exclusive Option is a one
     time fee of [*****] payable no sooner than December 1, 1998.

If DOW requests a non-exclusive grant for the Field to make, have made, use,
sell, import and have sold the Enzyme for the Field in the Territory, including
the patents and technology on the Enzyme In the Field, then the terms shall be
negotiated using reasonable good faith efforts by the Parties by January 31,
1999.

In either event the Option shall be executed by the Parties no later than
December 1, 1998 if exclusive or January 31, 1999 if non-exclusive.

                                               *Confidential Treatment Requested

                                       1.
<PAGE>

4.   Option Term - The Option term shall be for the term of the research plan
     ("Plan"), including any mutually agreed upon extensions ("Term"). At
     present both Parties agree that the Term for an exclusive license shall run
     from the letterhead date of this Letter of Intent until December 1, 1998
     and for a nonexclusive until January 31, 1999. By the end of the Term DOW,
     at its sole discretion, may negotiate an exclusive license to the Enzyme
     and gene coding for the Enzyme in the Field from RBI, or purchase the
     Enzyme or immobilized Enzyme from RBI or an alternate supplier in accord
     with Paragraph 8. Upon exercise of the license, manufacturing licenses and
     terms of sale for any Enzyme shall be on commercially reasonable terms,
     mutually agreed upon, and shall include, without limitation, royalties and
     minimum payments.

In the event that the Enzyme is improved and DOW has had [*****] from the time
the technology and improved Enzyme is delivered to DOW in accord with Milestone
3(B) to test it, and DOW then provides written notice to RBI of DOW's lack of
interest in commercial use of the improved Enzyme provided by RBI, then, at
RBI's sole option, either:

(a)  RBI shall pay DOW as a one time fee for DOW's total investment in the
     Enzyme (which fee shall be computed from the time of such request by RBI,
     but in no event would be less than [*****]). Such payment would be due to
     DOW within thirty (30) days from invoice by DOW; or
(b)  RBI agrees to pay to DOW reasonable royalty and payments for all income
     received from RBI's commercialization or sale of the technology or patents
     using the Enzyme. Such payments shall be negotiated as an agreement by the
     Parties using good faith efforts.

RBI must elect between (a) and (b) within [*****] from DOW's written
notification of lack of interest and convey their election in writing to DOW.

DOW has the right, during the Term and the eighteen (18) month evaluation
period, for purposes of evaluation only, to produce sufficient Enzyme for its
needs.

5.   Payments - Within fifteen (15) days from execution of the Option DOW shall
     pay RBI [*****]. For subsequent payments DOW shall be invoiced one (1)
     month prior to any payment due to RBI. The further payments are tied to
     achievement of milestone technical events.  The technical events for each
     milestone payment are described in Paragraph 6. The payments for each
     milestone are:

Milestone 1 - [*****]

[*****] if RBI is technically successful as defined in Paragraph 6; plus [*****]
if RBI accomplishes this Milestone 1 in less than [*****] days from the date on
which RBI receives the assay from DOW;

Milestone 2 - Productivity Calibration Definitions for Milestone 2:

"Candidate Enzymes" are those which meet the criteria of exhibiting initial
hydrolysis rates (Vmax) significantly higher than the wild type (wt) recombinant
enzyme toward a [*****].

                                               *Confidential Treatment Requested

                                       2.
<PAGE>

Kinetically, a Candidate Enzyme that is significantly
higher is characterized as having a Vmax [*****].

"Evolved Enzymes" are those which meet the criteria of exhibiting [*****].

Payments for Milestone2:

[*****] payable within thirty (30) days of receipt by DOW of the Enzyme
sequences and validation by DOW that RBI has provided DOW with at least [*****]:
and

Milestone 3 - Productivity Enhancement Definitions for Milestone 3:

"Improved Enzymes" are those which meet the criteria of, exhibiting at least;
plus [****] if RBI provides DOW with at least [*****].

"Productivity Enzymes" are those which meet the criteria of exhibiting at least
[*****].

"Target Activity" refers to the Milestone 3 improvement target for the initial
hydrolysis rate (Target Vmax) toward a [*****]. It is determined at the
conclusion of Milestone 2 and projected from the Milestone 2 data to be
sufficient for a commercial catalyst. It is defined in terms of fold-improvement
over the wild-type (wt) recombinant Enzyme activity under [*****].

Payments for Milestone 3:

(A) [*****] payable within thirty (30) days of receipt by DOW of the Enzyme
sequence and validation by DOW that RBI has provided DOW with at least [*****]
plus (B) [*****] payable within thirty (30) days of receipt by DOW of the Enzyme
sequence and validation by DOW that RBI has provided DOW with at least [*****]

                                               *Confidential Treatment Requested

                                       3.
<PAGE>

[****]

(i)   [*****]

(ii)  [*****]

(iii) [*****]

[*****]

[*****]

These payments are tied to performance under the Plan described in Paragraph 6.

6.   Plan - During the Term, RBI shall perform research activities to improve
     the Enzyme to achieve Target Activity in the Field in a diligent manner as
     specified in Paragraph 5 and described in detail in a protocol attached to
     the Option. Such improvement can be met by any manner acceptable to the
     Parties. The Enzyme is to be improved for commercial use in a manner agreed
     upon between the Parties. The protocol may be amended by written consent of
     the Parties. However, either Party may terminate the research and the
     Option at any technical milestone specified below for any reason; but if
     RBI terminates, then DOW has thirty (30) days to notify RBI whether DOW
     desires either an exclusive or non-exclusive license for the Enzyme until
     that termination.

     .     Milestone 1 = [*****].

     .     Milestone 2 = [*****].

                                       4.
<PAGE>

           [****]

     .     Milestone 3 = [*****].

     (B)   RBI increases productivity as stated in Paragraph 5 for Productivity
           Enzymes and transfers as UCA [*****] DOW confirms [****].

These events for performance under the Plan are tied to payments under Paragraph
5.

7.   Patents - Any improvements to the Enzyme made by RBI during the Option
     shall belong to RBI, if within the claimed scope of an issued RBI patent or
     pending patent application. DOW shall be informed of all such patents or
     pending applications and be provided with a copy thereof, and provided with
     their publication numbers or patent numbers and each country where filing
     was done. If requested by DOW, a completed file wrapper for a given
     application or patent shall be provided to DOW. An annual status of the
     concerned patents shall be provided to DOW until all have issued or are
     abandoned.

Although unlikely to occur, in any instance where a Joint patent between DOW and
RBI results in a patentable invention, then DOW and RBI shall mutually
determine, using good faith efforts, whether DOW or RBI shall file and prosecute
the patent application and pay the annuities. If DOW exercises its Option for
exclusive rights for the joint patent shall be granted in the Option to DOW for
the Field for the Territory.

Know-how developed under the Option or known as of the Letter of Intent by
either Party shall remain that Party's property. Any use by one Party of the
other's know-how shall be under the confidentiality provisions of Paragraph 14.

8.   [*****] - In the event that the Enzyme is improved and is of further
     interest to DOW and DOW exercises its Option, then DOW shall have [*****]
     from the time the improved Enzyme is delivered in a practicable form to DOW
     in accord with Milestone 3(B) to provide by written notice to RBI of DOW's
     intent to either:

                                               *Confidential Treatment Requested

                                       5.
<PAGE>

(a)  [*****].  If this course is mutually agreed upon then a commercial
     agreement shall be negotiated using reasonable good faith efforts by the
     Parties;
or

(b)  inform RBI that DOW will use an alternate supplier (not RBI) for the
     improved Enzyme. RBI agrees to provide to a qualified third party under
     appropriate, reasonable licensing terms for the industry, the information
     and rights required to supply the Enzyme to DOW.

If DOW does not desire any commercial supply of the improved Enzyme, then refer
to Paragraph 4.

9.   RBI Obligations - RBI shall provide a written report with a summary of the
     data to DOW on a quarterly basis or at a milestone achievement in a
     quarter, whichever occurs first. (If clarification of a report is requested
     by DOW to more fully understand such report, then a meeting of respective
     personnel permitted.) A final written report shall be provided of the
     results obtained by RBI on its improvement efforts for the Enzyme,
     including its sequence, within thirty (30) days at the end of the Term or
     within thirty (30) days upon termination, and [*****].

10.  DOW Obligations - DOW shall provide the [*****].

11.  Safety - RBI personnel agree to observe the same safety and other rules
     required of DOW employees while RBI is on premises owned, operated, leased
     or under the control of DOW.

     DOW personnel agree to observe the same safety and other rules required of
     RBI employees while DOW is on premises owned, operated, leased or under the
     control of RB1.

12.  Liability - Neither DOW, any of its subsidiaries, nor the respective
     agents, servants, and employees of each shall be liable to RBI or RBI's
     employees, directors, agents or legal heirs, for any personal injury,
     death, or property damage that occurs while RBI is performing under the
     Option, except to the extent such injury, death, or property damage is
     caused by the sole negligence of Dow.

     Neither RBI, any of its subsidiaries, nor the respective agents, servants,
     and employees of each shall be liable to DOW, or DOW's employees,
     directors, agents or legal heirs, for any personal injury, death, or
     property damage that occurs while DOW is performing under the Option,
     except to the extent such injury, death, or property damage is caused by
     the sole negligence of RBI.

                                               *Confidential Treatment Requested

                                       6.
<PAGE>

13.  RBI's Status - RBI's status hereunder is that of an independent contractor,
     and not that of an agent of DOW. As such RBI is responsible of all Income
     Tax withholding and the payment of any other appropriate taxes on all
     payment to RBI by DOW.

14.  Confidentiality - The Parties agree to maintain confidential all
     discussions and information obtained from the other regarding the Enzyme,
     the Field, business information of RBI or DOW since August 29, 1996, and to
     maintain confidential any discussions on terms for the Option, except for
     information:

(a)  which was known to RBI prior to receipt or development hereunder;

(b)  which is, or without fault of RBI becomes, generally known to the public;
     or

(c)  which is acquired by RBI, without an obligation of confidence, from a third
     party having a legal right to make such disclosure.

     No rights are granted by DOW to RBI to use any DOW intellectual property
     rights including patents, trade secrets, confidential information and
     computer programs, except in providing the contemplated Plan services. Each
     Party's obligations for confidentiality shall cease five (5) years from
     termination of this Letter of Intent or Option, which ever time is later.
     Confidentiality terms and conditions shall also be included and continued
     in the Option.

15.  Publicity - Neither DOW nor RBI shall make public the financial terms of
     this Letter of Intent. Any press release or publicity concerning this
     Letter of Intent shall be reviewed and approved by both Parties prior to
     any release.

16.  Entire Agreement - This Letter of Intent document contains the entire
     agreement between the Parties and supersedes all preexisting agreements
     between them respecting its subject matter. Modification of this Letter of
     Intent shall only be binding if made in writing and signed by both Parties.

17.  Choice of Law - This Agreement shall be subject to the laws of the State of
     Michigan, excepting its conflict of laws provisions.

18.  Other Items - Other customary terms and conditions in the Option are also
     expected and modifications of this Letter of Intent that form a part of the
     Option are permitted.

     Upon signature by both Parties, the letterhead date is the effective date
     for this Letter of Intent.  This Letter of Intent shall be void ab initio
     if not signed by both Parties no later than June 16, 1997. The negotiations
     for the Option shall then begin, using good faith efforts, to complete the
     Option no later than forty-five (45) days from this letterhead date. Such
     Option is subject to management and/or Board approval by each Party, which
     shall be secured by each Party prior to exercise of and/or signing the
     Option, if required. Should the Parties fail to reach agreement for the
     Option by that date, then either the date may be extended by mutual written
     consent or the negotiations may be terminated.

                                       7.
<PAGE>

Sincerely,

Fred P. Carson
Vice President
Research and Development

AGREED TO AND ACCEPTED BY:
Recombinant BioCatalysis Inc.


_______________________________
Donald G. Garaventi
President

Date________________

                                       8.
<PAGE>

                       This Appendix is blank as of the

                     SIGNATURE DATE.  Additions during the

                           OPTION TERM are possible.

                                       1.
<PAGE>

                       This Appendix is blank as of the

                     SIGNATURE DATE.  Additions during the

                           OPTION TERM are possible.

                                      1.
<PAGE>

                                  APPENDIX D

                     [DOW PARTNERSHIP PROJECT SPREADSHEET]

                                       1.
<PAGE>
                                  APPENDIX E

CONFIDENTIALITY AGREEMENT                                       August 27, 1996

In order to protect certain proprietary, confidential information (Information)
which may be exchanged between them, The Dow Chemical Company (DOW), having an
address of:  Patent Department, P.O. Box 1967, 1790 Building, Midland, Michigan
48641-1967, Attn:  Karen L. Kimble; and Recombinant Biocatalysis, Inc., Elmwood
Court Two, 512 Elmwood Avenue, Sharon Hill, PA  19079-1005 (RBI), and together
hereafter called the Parties, agree that:

1.  The effective date of this Agreement is August 27, 1996.
2.  The Discloser(s) of Information is (are):  Both Parties.
3.  The Recipient(s) of Information is (are):  Both Parties.

4.  The Information disclosed under this Agreement is: any and all information
    including but not limited to, data, know-how, any and all subject matter
    (whether patentable or not) pertaining to the Parties research, inventions,
    development, materials, technology, businesses plans, processes, protocols,
    enzymes, expression systems, the commercial applications of enzymes which
    the parties consider to be of value, and all information generated by RBI as
    a result of carrying out the purpose set forth in paragraph 5.

5.  The purpose for disclosing Information is to see if RBI's proprietary
    technology might be used to improve performance of Dow proprietary [****]
    enzymes, or if RBI's proprietary collection of enzymes contains any enzymes
    of commercial interest to DOW, or if RBI and DOW should enter into a
    relationship to identify novel enzymes of commercial interest to DOW.

6.  This Agreement covers only Information disclosed between Effective Date and
    August 27, 1997. Recipient's obligations shall expire on August 27, 1999.

7.  Recipient agrees to maintain Information in confidence and not disclose
    Information to any third party except as expressly provided in this
    Agreement. Recipient will not use Information except as provided for in
    Paragraph 5. Recipient shall use the same degree of care, but no less than a
    reasonable degree of care, as the Recipient uses to protect its own
    confidential information of a like nature to prevent disclosure of
    Information to third parties. Third parties include all governmental patent
    offices.

8.  Recipient's obligations will apply only to Information that is: (a)
    disclosed in tangible form clearly identified as confidential at the time of
    disclosure; (b) disclosed initially in non-tangible form and identified as
    confidential at the time of disclosure and, within thirty (30) days of the
    initial disclosure, is summarized and designated as confidential in writing
    and delivered to Recipient; or (c) generated by Recipient as set forth in
    Paragraph 4.

                                               *Confidential Treatment Requested

                                      1.
<PAGE>

9.   Recipient has no obligation with respect to any Information disclosed
     hereunder which: (a) was in Recipient's possession before receipt from
     Discloser; (b) is or becomes a matter of general public knowledge through
     no fault of Recipient; (c) is rightfully received by Recipient from a third
     party without an obligation of confidence; (d) is disclosed by Discloser to
     a third party without an obligation of confidence on the third party; (e)
     is independently developed by Recipient's representatives who have not had
     access to such Information; or (f) is disclosed without obligation of
     confidence under operation of law, governmental regulation, or court order,
     provided Recipient first gives Discloser notice and uses all reasonable
     effort to secure confidential protection of such Information. Specific
     confidential Information shall not be considered to fall within the above
     exceptions merely because it is within the scope of more general
     information within an exception. A combination of features shall not be
     considered to fall within the above exceptions unless the combination
     itself, including its principles of operation, are within the exceptions.

10.  All Information shall be provided at the sole discretion of Discloser. With
     respect to Information, DISCLOSER MAKES NO WARRANTIES OF ACCURACY,
     RELIABILITY, COMPLETENESS, MERCHANTABILITY OR FITNESS FOR ANY PURPOSE.
     INFORMATION IS PROVIDED ON AN "AS-IS" BASIS AND DISCLOSER EXPRESSLY
     DISCLAIMS ANY WARRANTIES WITH RESPECT TO THE INFORMATION. Discloser shall
     not be liable for any consequential, punitive, exemplary or incidental
     damages arising out of the evaluation or use of Information by Recipient.

11.  Neither Party transfers any rights in Information. No rights are granted
     under any intellectual property rights of either Party. This Agreement does
     not create any other obligations, including agency or partnership
     obligations, between the parties. This Agreement does not constitute an
     offer to sell Information. Results obtained by Recipient upon evaluation of
     Information shall be disclosed to Discloser. Copyrights on reports of
     results transferred to Discloser generated by Recipient based on the
     evaluation of Information shall be owned by Discloser.

12.  Recipient will not knowingly export or reexport any Information or software
     received from Discloser or the direct products of such Information or
     software to any country or entity or for any use prohibited by the U.S.
     Export Administration Regulations unless properly authorized by the U.S.
     Government.

13.  The parties may disclose Information received from Discloser to their
     Affiliates, consultants or third-party contractors on a need-to-know basis,
     subject to confidentiality terms consistent with this Agreement. The
     Parties warrant that their Affiliates, consultants or third-party
     contractors will comply with the terms of this Agreement. Affiliates means
     companies wherein either Party owns or controls, directly or indirectly,
     greater than fifty percent of the equity interest of the company or in
     which a Party has management control.

14.  This Agreement can only be changed by a written document signed by all
     parties. The terms of this Agreement shall become effective upon the
     Effective Date when executed
                                      2.
<PAGE>

       by all parties. This Agreement shall become voidable upon written notice
       by DOW in the event it is not executed by all parties within 120 days of
       the date first written above. This Agreement shall be governed according
       to the laws of the State of Michigan. The parties have caused this
       Agreement to be executed in duplicate and this Agreement may be signed in
       separate counterparts.

THE DOW CHEMICAL COMPANY  RECOMBINANT BIOCATALYSIS, INC.

By: ___________________________       By: _____________________________

Name: _________________________       Name: ___________________________

Title: ________________________       Title: __________________________

Date: _________________________       Date: ___________________________


                                      3.

<PAGE>

                                                                   EXHIBIT 10.16

                                               Confidential Treatment Requested
                                             Under 17 C.F.R. (S)(S) 200.80(b)(4)
                                                      200.83 and 230.406


                       COLLABORATIVE RESEARCH AGREEMENT


                                    BETWEEN



                           THE DOW CHEMICAL COMPANY



                                      AND



                              DIVERSA CORPORATION
<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
  ARTICLE                                  TITLE                                      PAGE NUMBER
- ---------------------------------------------------------------------------------------------------
<S>           <C>                                                                     <C>
     1                                  DEFINITIONS                                        1
- ---------------------------------------------------------------------------------------------------
     2                                  R&D PROGRAM                                        6
- ---------------------------------------------------------------------------------------------------
     3                                 LICENSE RIGHTS                                     14
- ---------------------------------------------------------------------------------------------------
     4                                    PAYMENTS                                        16
- ---------------------------------------------------------------------------------------------------
     5                     LICENSE AGREEMENT; DEVELOPMENT REPORTS                         17
- ---------------------------------------------------------------------------------------------------
     6                     TREATMENT OF CONFIDENTIAL INFORMATION                          17
- ---------------------------------------------------------------------------------------------------
     7                          INTELLECTUAL PROPERTY RIGHTS                              20
- ---------------------------------------------------------------------------------------------------
     8        PROVISIONS CONCERNING THE FILING, PROSECUTION AND MAINTENANCE OF            21
                                       PATENT RIGHTS
- ---------------------------------------------------------------------------------------------------
     9                                  LEGAL ACTION                                      22
- ---------------------------------------------------------------------------------------------------
    10                         TERMINATION AND DISENGAGEMENT                              23
- ---------------------------------------------------------------------------------------------------
    11                         REPRESENTATIONS AND WARRANTIES                             25
- ---------------------------------------------------------------------------------------------------
    12                                INDEMNIFICATION                                     26
- ---------------------------------------------------------------------------------------------------
    13                               DISPUTE RESOLUTION                                   27
- ---------------------------------------------------------------------------------------------------
    14                                 MISCELLANEOUS                                      28
- ---------------------------------------------------------------------------------------------------

<CAPTION>
- ---------------------------------------------------------------------------------------------------
 APPENDIX                                  TITLE                                          PAGE
- ---------------------------------------------------------------------------------------------------
<S>          <C>                                                                          <C>
   A-1                                RESEARCH [*****]                                    A-1
- ---------------------------------------------------------------------------------------------------
   A-2                                 [*****] PLANS                                      A-2
- ---------------------------------------------------------------------------------------------------
   A-3                                 RMC MEMBERSHIP                                     A-3
- ---------------------------------------------------------------------------------------------------
   B-1                             PATENT RIGHTS [*****]                                  B-1
- ---------------------------------------------------------------------------------------------------
   B-2                         DIVERSA PATENT RIGHTS [*****]                              B-2
- ---------------------------------------------------------------------------------------------------
</TABLE>

                                              * Confidential Treatment Requested
<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
 APPENDIX                                   TITLE                                         PAGE
- ---------------------------------------------------------------------------------------------------
<S>          <C>                                                                          <C>
   B-3       PATENT RIGHTS [*****]                                                        B-3
- ---------------------------------------------------------------------------------------------------
   B-4                  [*****] DIVERSA PARENT RIGHTS [*****]                             B-4
- ---------------------------------------------------------------------------------------------------
    C                                MILESTONE PAYMENTS                                   C-1
- ---------------------------------------------------------------------------------------------------
    D                                 LICENSE AGREEMENT                                   D-1
- ---------------------------------------------------------------------------------------------------
    E                                [*****] PROCEDURES                                   E-1
- ---------------------------------------------------------------------------------------------------
    F                            MATERIAL TRANSFER AGREEMENT                              F-1
- ---------------------------------------------------------------------------------------------------
    G                                 LICENSED [*****]                                    G-1
- ---------------------------------------------------------------------------------------------------
    H                                 RESEARCH [*****]                                    H-1
- ---------------------------------------------------------------------------------------------------
</TABLE>

                                      iii     * Confidential Treatment Requested

<PAGE>

                        COLLABORATIVE RESEARCH AGREEMENT

                                    BETWEEN


                            THE DOW CHEMICAL COMPANY


                                      AND


                              DIVERSA CORPORATION

     COLLABORATIVE RESEARCH AGREEMENT (including the Appendices hereto, the
"Agreement") by and between THE DOW CHEMICAL COMPANY, a corporation duly formed
and existing under the laws of Delaware, having a place of business at 2030 Dow
Center, Midland, Michigan 48674, United States of America ("DOW" or a "Party"),
and DIVERSA CORPORATION, a corporation duly formed and existing under the laws
of Delaware, having a place of business at 10665 Sorrento Valley Road, San
Diego, California 92121, United States of America ("DIVERSA" or a "Party").

                                R E C I T A L S

     A.  DIVERSA has discovered and developed enzymes and has expertise in the
rearrangement of DNA to produce and discover genes utilizing proprietary
technologies for the rapid discovery, development and optimization of enzymes.

     B.  DOW has expertise in the discovery, development and production of
chemical compounds.

     C.  DOW and DIVERSA wish to enter into this Agreement in order to perform
research together to discover and optimize the function of new genes, processes
and products resulting thereupon that can be used by DOW to produce certain,
desired commercial chemical compounds.

     D.  DIVERSA will perform research either independently or with DOW on
projects funded and supported by DOW in order to discover and develop such
genes processes and products resulting therefrom for the purpose of development,
manufacture use and sale of products by DOW.

     E.  DOW will perform research to develop products and technology [*****].

     NOW, THEREFORE, in consideration of the mutual covenants contained herein,
and for other good and valuable consideration, the Parties hereby agree as
follows:


                                      1       * Confidential Treatment Requested
<PAGE>

Article 1.  DEFINITIONS

When used in this Agreement, the following terms shall have the meanings set out
below, unless the context requires otherwise.  The singular shall be interpreted
as including the plural and vice versa, unless the context clearly indicates
otherwise.

1.1  "Affiliate" means any corporation, firm, limited liability company,
      ---------
     partnership or other entity that directly or indirectly controls or is
     controlled by or is under common control with a Party to this Agreement.
     Control for purpose means ownership, directly or through one or more
     affiliated entities, of [*****] or more of the shares of stock
     entitled to vote for the election of directors in the case of a
     corporation, or [*****] or more of the equity interests in the
     case of any other type of legal entity, or any other arrangement whereby a
     Party controls or has the right to control the board of directors or
     equivalent governing body of a corporation or other entity.

1.2  "Agreement Term" means six months from the expiration or termination of
     ---------------
     the Research Term or until this Agreement is otherwise terminated as
     provided herein.

1.3  "Areas of Interest" means the development of [*****] Enzymes (as defined
      -----------------
     below) for use in the following [*****]:

     [*****]

1.4  "Confidential Information" means all information, Know-How, scientific,
      ------------------------
     technical, or non-technical data, samples and Materials, business plans,
     and marketing and sales information disclosed by one Party to the other
     hereunder or under the Option Agreement between DIVERSA and DOW dated June
     30, 1997, whether disclosed or provided in oral, written (including but not
     limited to electronic, facsimile, paper or other means), graphic,
     photographic or any other form, except to the extent that such information:

     (i)    as of the date of disclosure is known to the receiving Party as
            shown by written documentation, other than by virtue of a prior
            confidential disclosure from the disclosing Party to the receiving
            Party;

     (ii)   as of the date of disclosure is in, or subsequently enters, the
            public domain through no fault or omission of the receiving Party;

     (iii)  as of the date of disclosure or thereafter is obtained from a Third
            Party free from any obligation of confidentiality; or

     (iv)   as of the date of disclosure or thereafter is developed by the
            receiving Party independent of the disclosure by the disclosing
            Party as evidenced by written

                                       2      * Confidential Treatment Requested
<PAGE>

          documentation.

1.5   "Consultants" means a non-Affiliate person who is under confidentiality to
       -----------
      and paid by a Party to act or advise on that Party's behalf under this
      Agreement.

1.6   "Controls" or "Controlled" means, with respect to intellectual property,
       --------      ----------
      possession (other than by virtue of this Agreement) of the ability to
      grant licenses or sublicenses to the other Party hereto without violating
      the terms of any agreement or other arrangement with any Third Party
      [*****].

1.7   "DIVERSA Intellectual Property" means DIVERSA Patent Rights and DIVERSA
       -----------------------------
      Know-How and Joint Intellectual Property.

1.8   "DIVERSA Know-How" means know-how Controlled solely by DIVERSA.  The term
       ----------------
      "know-how" means all Research Results and all know-how, nonpatented
      inventions, improvements, discoveries, data, instructions, [*****]
      information (including, without limitation, [*****] and information),
      processes, procedures, devices, methods and trade secrets which are
      conceived, discovered or invented during the Research Term in the course
      of performance of the R&D Program or which have been conceived, discovered
      or invented by DIVERSA prior to this Agreement, and which are necessary or
      appropriate to develop and commercialize Licensed Products; and does not
      include inventions within the Patent Rights.

1.9   "DIVERSA Patent Rights" means Patent Rights Controlled solely by DIVERSA
      [*****].

1.10  "DIVERSA Research Results" means Research Results invented or discovered
       ------------------------
       solely by DIVERSA.

1.11  "DOW Intellectual Property" means DOW Patent Rights and DOW Know-How and
       -------------------------
       Joint Intellectual Property.

1.12  "DOW Know-How" means Know-How Controlled solely by DOW.
       ------------

1.13  "DOW Patent Rights" means Patent Rights Controlled solely by DOW.
       -----------------

1.14  "DOW Research Results" means Research Results invented or discovered
       --------------------
       solely by DOW.

1.15  "Effective Date" means the date of last signature set forth at the end of
       --------------
       this Agreement.

1.16  "Field" means [*****]; all Areas of Interest shall fall within this field.
       -----

1.17  "FTE" means the equivalent of one full year of work on a full time basis
       ---
      by a scientist or other professional [*****]


                                       3      * Confidential Treatment Requested
<PAGE>

      [*****].

1.18  "Intellectual Property" means Diversa Intellectual Property and Dow
       ---------------------
      Intellectual Property.

1.19  "[*****] Enzyme" means an enzyme or enzymes, either ex vivo or in vivo,
       --------------
      provided to Dow by Diversa which is within the claims of DIVERSA Patent
      Rights or that incorporates, is derived from, or is identified,
      discovered, developed or made through the use of DIVERSA Know-How, which
      is developed from the [*****].

1.20  "Jointly Developed" or "Jointly Invented" means any item developed or
       -----------------      ----------------
      invented by both Parties in the course of the performance of the R & D
      Program during the Research Term. If the item developed or invented is a
      patentable invention, such invention is jointly developed if both Parties'
      employees or consultants are considered inventors under 35 U.S.C. et.
      seq., as interpreted by the U.S. Patent and Trademark Office and the
      United States courts.

1.21  "Joint Intellectual Property" means Joint Patent Rights and Joint Know-
       ---------------------------
      How.

1.22  "Joint Know-How" means Know-How which is Jointly Developed or Jointly
       --------------
      Invented.

1.23  "Joint Patent Rights" means Patent Rights which are Jointly Developed.
       -------------------

1.24  "Joint Research Results" means Research Results which are Jointly
       ----------------------
      Developed or Jointly Invented.

1.25  "Know-How" means all Research Results and all know-how, nonpatented
       --------
      inventions, improvements, discoveries, data, instructions, [*****]
      information (including, without limitation, [*****] and information),
      processes, procedures, devices, methods and trade secrets which are
      conceived, discovered or invented during the Research Term in the course
      of performance of the R&D Program, and which are necessary or appropriate
      to develop and [*****].

1.26  "License Agreement" means the agreement described in Section 5.1 hereof.
       -----------------

1.27  "Licensed Product" means (i) [*****] which is used to [*****], or (ii)
       ----------------
      [*****] and which is [*****] and which both (i) and (ii) are designated by
      the RMC and listed on Appendix G attached hereto, encompassed within
      [*****], which is attached hereto and made a part hereof. It is expected
      that [*****] at the exercise of each License Agreement.

1.28  "Material" means the original, tangible materials provided by DOW or
       --------
      DIVERSA to the

                                       4     * Confidential Treatment Requested
<PAGE>

      other Party in order that the recipient can perform its obligations under
      the R&D Program and any exchange of samples developed during the R&D
      Program.

1.29  "Patent Rights" means (i) all patents and patent applications which are
       -------------
      conceived of by DIVERSA and/or DOW during the Research Term and in the
      course of performance of the R & D Program, and which are necessary for
      DOW to make, use or sell the Royalty Bearing Products (as defined in the
      License Agreement); if such patent rights arise they shall be listed on
      Appendix B-1, attached hereto and made a part hereof; (ii) the patents and
      patent applications listed on Appendix B-2, attached hereto and made a
      part hereof, are patent rights of DIVERSA that [*****]; (iii) the [*****];
      and (iv) any divisions, continuations, continuations-in-part, reissues,
      reexaminations, extensions or other governmental actions which extend any
      of the subject matter of the patent applications or patents in (i) or (ii)
      above, and any substitutions, confirmations, patents-of-addition,
      registrations or revalidations of any of the foregoing, in each case,
                                                              ------------
      which are Controlled by DIVERSA or DOW during the Research Term and which
      are necessary for DOW to make, have made, use, sell, have sold, export or
      import the Royalty Bearing Products. All patents and patent applications
      subject to this definition are listed on Appendix B or will be included on
      Appendix B by the end of the Agreement Term.

1.30  "R&D Program" means the research and development program to be conducted
       -----------
      during the Research Term by DIVERSA and DOW pursuant to Section 2, as more
      fully described [*****].

1.31  "Research Data" means all data, [*****] and any other information
       -------------
      obtained or developed in the course of performance of the R&D Program.

1.32  "Research Management Committee" or "RMC" means the committee created
       -----------------------------      ---
      pursuant to Section 2.2 hereof and which membership is defined in Appendix
      A-3, attached hereto and made a part hereof.

1.33  "Research Materials" mean all tangible property obtained or developed in
       ------------------
      the course of performance of the R&D Program, including but not limited to
      [*****] Enzymes.

1.34  "Research Project Flow Chart" means a chart as Appendix H, attached hereto
       ---------------------------
      for reference, to aid in understanding the efforts made under this
      Agreement and the [*****].

                                       5      * Confidential Treatment Requested
<PAGE>

1.35  "Research Results" means Research Data and Research Materials.
       ----------------

1.36  "[*****]" means a specific target within [*****] as specifically
       -------
      described in Appendix A-1 hereto and made a part hereof, as may be amended
      from time to time by the RMC in its written minutes.

1.37  "[*****]" means a [*****] within [*****] as specifically described in
       -------
      Appendix A-1 hereto and made a part hereof, as may be amended from time to
      time by the RMC in its written minutes.

1.38  "Research Term" means the period commencing on the Effective Date and,
       -------------
      unless extended by written agreement of the Parties or sooner terminated
      as provided herein, terminating on the third (3) anniversary of the
      Effective Date.

1.39  "Responsible Party" shall have the meaning set forth in Section 8.1.2.
       -----------------

1.40  "Staffing Level" shall have the meaning set forth in Section 2.1.1(d).
       --------------

1.41  "Third Party" means any party who is not a Party, or an Affiliate.
       -----------

1.42  "[*****] Plans" mean the written plans drafted and approved by the RMC
       -------------
      defining the activities to be carried out for, and the budget for, each
      [*****] during each twelve month period of the R&D Program, as more
      specifically detailed in [*****] attached hereto and made a part hereof,
      as modified from time to time by the RMC in its written minutes. The
      [*****] Plan Procedures are provided in [*****], attached hereto and made
      a part hereof.

Article 2.  R&D PROGRAM

2.1  Implementation of the R&D Program.
     ----------------------------------

     2.1.1  Basic Provisions of Program.

            (a)  The primary objective of the R&D Program shall be the
                 identification and development of [*****] Enzymes providing
                 enhanced or new properties useful in the [*****]. The Research
                 [*****] indicates the progress expected to occur under this
                 Agreement; namely, from [*****] discovery to [*****] Enzyme to
                 identification of a Licensed [*****]. Once a Licensed [*****]
                 is identified then the License Agreement pertains for the
                 remainder of the [*****].

            (b)  DIVERSA and DOW shall use their reasonable good faith efforts
                 to conduct the research activities set forth in the [*****]
                 Plans, and to provide Materials as set forth therein. Both
                 Parties shall employ the best methods they know which are
                 legally available to them to

                                       6      * Confidential Treatment Requested
<PAGE>

                 perform the [*****] Plans. However, [*****] (which basis must
                 be explained to DIVERSA) about the ability of DIVERSA to
                 [*****], then DOW may request a modification to the [*****]
                 Plan. DOW accepts that this could effect the ability to obtain
                 the desired [*****] Enzyme(s) for the [*****].

            (c)  The Research [*****] and Research [*****], both in [*****], are
                 defined in the [*****] Plans in [*****], as amended from time
                 to time by the RMC in its written minutes.

            (d)  In carrying out the R&D Program, DIVERSA shall devote [*****]
                 FTEs per year for each of the [*****] years of the Research
                 Term ("Staffing Level"), and DOW shall pay DIVERSA for the
                 services of such FTEs as set forth herein. At the request of
                 DOW, DIVERSA will in good faith consider and discuss proposed
                 increases or decreases to the Staffing Level with adjustments
                 in payments. Notwithstanding the foregoing or anything
                 contained herein to the contrary, that the Staffing Level shall
                 remain at [*****] FTEs, unless the Parties, in each Party's
                 sole discretion, agree in writing to increase or decrease the
                 Staffing Level. Any increase or decrease to the Staffing Level
                 agreed to by the Parties shall be [*****] in the relevant
                 [*****] Plan for each Research [*****] or Research [*****] and
                 the budget associated with such [*****] Plan. Unless previously
                 consented to in writing by DOW, the budget for the [*****] Plan
                 for each Research [*****] and Research [*****] shall remain
                 within the funding proposed in Section 4. No more than [*****]
                 times per Research Term year, DOW shall have the right to
                 audit, at its expense, during regular business hours at
                 DIVERSA's place of business and, if conducted at different
                 sites also where the work is performed, both for the technology
                 development and FTEs assigned to the R&D Program.

            (e)  DIVERSA and DOW shall use commercially reasonable efforts to
                 perform the tasks set forth in the [*****] Plans, and to
                 provide the facilities, materials and equipment necessary to
                 perform the research activities set forth in the [*****] Plans.

            (f)  DIVERSA shall not be obligated to utilize more than [*****]
                 FTEs per year in the R&D Program. DOW shall be responsible for
                 the expense of research activities in the R&D Program that are
                 [*****], provided that DOW is notified of the reasons why
                 DIVERSA [*****], is notified of the [*****], and gives its
                 prior written consent.
                 -------------

            (g)  At such time as each [*****] Plan is under consideration by the
                 RMC, DOW may propose to the RMC to [*****] any selected

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                 Research [*****] or Research [*****] and upon acceptance of
                 the proposal by the RMC in its written minutes, DIVERSA will
                 [*****] in respect of such Research [*****] or Research
                 [*****], subject to DOW's obligations to maintain the Staffing
                 Level. In such event, DOW may propose a substitute Research
                 [*****] or Research [*****] within [*****] of the Areas of
                 Interest to be included in the R&D Program, which shall be
                 subject to the approval of the RMC. In the event no replacement
                 Research [*****] in any Area of Interest can be identified by
                 DOW and approved by the RMC, then (i) DOW may propose a new
                 [*****] which when accepted by the RMC would be added by
                 amendment to this Agreement or a new Research [*****] or
                 Research [*****] within the Field and if this new replacement
                 is acceptable to DIVERSA, this new replacement shall be
                 instituted promptly; or (ii) the Staffing Level will be
                 adjusted in accordance with Section 2.1.1(d).

            (h)  Upon any such abandonment under Section 2.1.1(g), DOW shall
                 have no further commercial rights with respect to any [*****]
                 Enzymes or other DIVERSA Intellectual Property related to the
                 abandoned Research [*****] or Research [*****]. DIVERSA shall,
                 however, be free to continue the research efforts on its own
                 behalf or with a Third Party at [*****] to DOW. All Joint
                 Intellectual Property related to any abandoned Research [*****]
                 or Research [*****] shall be listed on [*****] 3, attached
                 hereto and made a part hereof. DOW shall retain the right to do
                 research or non-commercial development using such Research
                 [*****]. However, if DOW should later develop during the
                 Agreement Term a suitable [*****] which DOW then desires to
                 commercialize and which product used [*****] Enzyme or DIVERSA
                 Patent Rights, then DOW would request [*****] DIVERSA. Unless
                 the abandoned Area of Interest has been [*****], DIVERSA shall
                 negotiate using good faith efforts with DOW for such [*****].

     2.1.2  Collaborative Efforts and Reports.
            ---------------------------------

            (a)  The Parties agree that the successful execution of the R&D
                 Program will require the collaborative use of both Parties'
                 areas of expertise. The Parties shall keep the RMC fully
                 informed about the status of the portions of the R&D Program
                 they respectively perform. Without limiting the foregoing, each
                 Party shall furnish to the RMC [*****] reports within [*****]
                 days after the end of each [*****] period, describing the
                 progress of its activities in connection with the R&D Program
                 in reasonable

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                 detail, including at least:

                         (i)  an estimation by DIVERSA of the FTEs used for each
                         Research [*****] and Research [*****] and the budget
                         used for each [*****] Plan, and

                         (ii) a summary of the testing and development of
                         [*****] Enzymes and Licensed [*****].

                  The reports described in this Section 2.1.2 (a) shall describe
                  all [*****] Enzymes that have been put into [*****], and shall
                  also contain sufficient other information to allow a Party to
                  monitor the other Party's compliance with this Agreement,
                  including without limitation, each Party's obligations with
                  respect to the accomplishment of the [*****]. All reports and
                  information provided under this Section 2.1.2 (a) shall be
                  deemed Confidential Information of the Party which provided
                  the information.

             (b)  DIVERSA and DOW shall cooperate in the performance of the R&D
                  Program and, subject to any confidentiality obligations to
                  Third Parties or legal restrictions, shall exchange
                  information [*****] as necessary to carry out the R&D Program
                  pursuant to the provisions of this Agreement. Each Party will
                  attempt to accommodate any reasonable request of the other
                  Party to send or receive personnel for purposes of discussing
                  the R&D Program. Such visits and access will be at mutually
                  agreed times, have defined purposes, be of agreed limited
                  duration, and be scheduled in advance. Each Party shall
                  [*****] of their respective personnel related to these visits.
                  It is understood that any such visiting personnel may be
                  [*****] the R&D Program and the rights of Third Parties, which
                  may include [*****] of the R&D Program. All personnel shall
                  abide by the required rules for any Third Party visiting that
                  Party's site, including, but not limited to, [*****] and other
                  matters.

             (c)  During the Research Term and for a period of [*****] years
                  thereafter, DIVERSA and DOW shall maintain records of the R&D
                  Program (or cause such records to be maintained) in sufficient
                  detail and good scientific manner as will properly reflect all
                  work done in the R&D Program and results achieved in the
                  performance of the R&D Program. Each Party shall allow the
                  other Party to have reasonable access to all pertinent
                  Research [*****] generated by or on behalf of such Party with
                  respect to each [*****] Enzyme. This retention of records may
                  be extended if there is a legal proceeding pending (i.e.,
                  court action, or US

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                  interference or opposition involving the Intellectual
                  Property) where those records are reasonably required and a
                  written request with the reason is provided to the Party.
                  Nothing herein shall require, or be construed to require, that
                  DIVERSA disclose to DOW any DIVERSA Know-How, except to the
                  extent necessary for the filing of patent applications
                  [*****]. DOW shall not be required to disclose to DIVERSA any
                  DOW Know-How or any DOW [*****] on any Research [*****],
                  Research [*****] or [*****] Enzyme, except for the reasonable
                  information required by the RMC.

     2.1.3  Work Plans.
            ----------

            (a)  In order to carry out the R&D Program, the RMC shall develop a
                 [*****] Plan for each Research [*****] and Research [*****].
                 These [*****] Plans shall be in writing and attached hereto as
                 [*****]. The [*****] Plans for each initial Research [*****]
                 and Research [*****] will be agreed to not later than [*****]
                 after the Effective Date and will be attached hereto as
                 Appendix [*****] and made a part hereof. For each [*****]
                 period during the Research Term after the period covered by the
                 initial [*****] Plans attached hereto as Appendix [*****],
                 [*****] Plans shall be prepared by the co-chairs of the RMC and
                 approved by the RMC no later than [*****] days before the end
                 of the then current [*****] period. Absent written agreement by
                 the Parties, DIVERSA and DOW shall continue to conduct research
                 activities within the scope of the projects set forth in the
                 previous [*****] Plans, within the bounds of the then currently
                 available FTEs.

            (b)  Each [*****] Plan shall set forth specific, [*****] research,
                 and development, objectives, including, without limitation, the
                 applicable Research [*****] and Research [*****] within Areas
                 of Interest, and resource allocations in accordance with the
                 procedures set forth in Appendix [*****] attached hereto. Each
                 [*****] Plan will reflect at least [*****], but no more than
                 [*****] research milestones per year. These research milestones
                 shall be designed to facilitate diligent development and
                 identification of [*****] Enzymes for use in the Research
                 [*****] or Research [*****]. The RMC will review research
                 milestones on at least a [*****] basis. If the milestones are
                 not met, then in the next written [*****] Plan, the RMC must
                 (i) revise these milestones and/or [*****] Plan, (ii) replace
                 the Research [*****] or Research [*****] with another Research
                 [*****] or Research [*****] using their good faith efforts,
                 (iii) if the replacement under (ii) is not deemed viable by the
                 RMC, then DIVERSA and DOW agree to use their good faith efforts
                 to permit some new [*****] in the Field to be substituted as a
                 new [*****], or

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<PAGE>

                 (iv) abandon that Research [*****] or Research [*****] if so
                 requested by DOW.

            (c)  If the RMC is unable to agree as to the terms of a [*****] Plan
                 for any given [*****] period following the initial [*****]
                 period for a [*****] Plan, by the date provided in Section
                 2.1.3(a), above, then the matter shall be addressed as provided
                 in Article 13 below .

            (d)  The [*****] Plans may be modified by the RMC to satisfy the
                 requirements of the Research [*****] and Research [*****], but
                 a written copy of each revised [*****] Plan, signed by the co-
                 chairs, shall be supplied to each Party as an amendment to
                 Appendix [*****].

     2.1.4  Additional Research Activities.
            ------------------------------

            (a)  In the event that prior to the end of the Research Term, all
                 research activities directed to [*****] Research [*****] and
                 Research [*****] have been successfully completed or terminated
                 by agreement of the Parties, then DOW shall have the right to
                 propose to DIVERSA:

                          (i) [*****] Research [*****] or Research [*****] to be
                          pursued in the Areas of Interest under the R&D
                          Program, or

                          (ii) deploying the FTEs on Research [*****] and
                          Research [*****] which are already underway, or

                          (iii) if (i) and (ii) are not available, then
                          considering deploying, using their good faith efforts,
                          the FTE's on Research [*****] or Research [*****]
                          within the Areas of Interest and for which DIVERSA has
                          [*****] or serious obligations ([*****]) to a Third
                          Party, or

                          (iv) if (i) through (iii) are not available, then
                          reducing the number of FTE's and [*****] for those
                          FTEs no longer required computed in accordance with
                          Section 4.4.

                 If DIVERSA does not have [*****] with respect to the Research
                 [*****] or Research [*****] proposed in Section 2.1.4(a)(i) or
                 (iii) and does not have a [*****] on its own behalf or with a
                 Third Party, the Parties shall negotiate in good faith the
                 terms on which such additional research activities

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                 may be conducted under the R&D Program. Such additional
                 research activities will only be initiated if the Parties reach
                 written agreement on the terms thereof, including, without
                 limitation, milestone and other payments on resulting products.

            (b)  During the R&D Program DOW may also propose that additional
                 research activities directed to [*****] and Research [*****]
                 and Research [*****] within those Areas of Interest, using
                 their good faith efforts, be conducted in connection with the
                 R&D Program. In such event, the Parties shall discuss an
                 expansion of the R&D Program, provided DIVERSA shall have no
                 obligation to conduct any such activities with DOW unless terms
                 for such activities are agreed to in writing by the Parties. If
                 DIVERSA does not have a [*****] with respect to a proposed
                 additional Research [*****]or Research [*****]on its [*****] or
                 with a Third Party, DIVERSA will notify DOW in writing of such
                 within [*****] days of the proposal, and within [*****] days of
                 such notice, the RMC will implement a [*****] for each
                 additional Research [*****] or Research [*****]. In the event
                 the RMC fails to initiate a [*****] Plan within such [*****]
                 day period, or if DOW notifies DIVERSA in writing that it does
                 not intend to pursue an additional Research [*****] or Research
                 [*****], DIVERSA shall have [*****] to DOW under this Agreement
                 with respect to such [*****] Research [*****] or Research
                 [*****] and may collaborate with a Third Party on such [*****]
                 Research [*****] or Research [*****].

            (c)  DOW shall further have the right during the [*****] period
                 following the Effective Date to propose up to [*****] projects
                 encompassed in new Areas of Interest [*****]. DIVERSA will
                 consider such proposal, and, if the Parties agree to proceed,
                 the Parties will negotiate a separate agreement for such a
                 collaboration [*****]. The separate agreement will contain
                 terms consistent with other DIVERSA agreements of this nature
                 for [*****], including a separate [*****], and different
                 milestone and [*****] payments.

     2.1.5  Disclosures.
            -----------

            If DIVERSA or DOW wishes to disclose any Research [*****] to a Third
            Party on a confidential basis, it shall first submit a description
            of the proposed disclosure directly to all members of the RMC for
            review at least [*****] prior to any such disclosure. Within [*****]
            of receipt of such description, the RMC shall notify DIVERSA or DOW,
            as the case may be, of its approval or denial of

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          such disclosure, provided such approval shall not be unreasonably
          withheld. Failure to provide such notice within the [*****] period
          shall be deemed to be consent to the proposed disclosure.

          Notwithstanding the foregoing, subject to Section 2.5, DIVERSA may
          provide any [*****] Enzyme under confidentiality terms at least as
          strict as this Agreement to a Third Party [*****] for use [*****] the
          Areas of Interest. DOW may provide any [*****] Enzyme under
          confidentiality terms at least as strict as this Agreement to any
          Third Party without the consent of the RMC or DIVERSA if used within
          the Areas of Interest if used with technology or intellectual property
          unavailable to DIVERSA.

     2.2  Research Management Committee.
          -----------------------------

          2.2.1  Establishment and Functions of RMC.
                 ----------------------------------

                 (a)  DIVERSA and DOW hereby agree to establish the RMC. The RMC
                      will act on behalf of the Parties and will be responsible
                      for the planning and monitoring of the R&D Program and for
                      setting forth specific research and development
                      objectives, including, without limitation, (i) preparation
                      and approval of each [*****] Plan in accordance with the
                      procedures set forth in Appendix [*****] attached hereto
                      and made a part hereof, (ii) determining whether research
                      projects should be continued as active projects, and (iii)
                      determining resource allocation for the R&D Program, so as
                      to insure that meaningful research and development
                      activity will be undertaken on all Research [*****] and
                      Research [*****] in each [*****] period, taking into
                      account that the overall research and development focus
                      reflects both [*****] priorities.

                 (b)  In planning and monitoring the R&D Program, the RMC shall
                      assign tasks and responsibilities taking into account each
                      Party's respective specific capabilities and expertise in
                      order to avoid duplication and enhance efficiency and
                      synergies. For example, [*****].

          2.2.2  RMC Membership.
                 --------------

                 DIVERSA and DOW each shall appoint, in its sole discretion,
                 [*****] members to the RMC, including a co-chair designated by
                 DOW and a co-chair designated by DIVERSA. Substitutes or
                 alternates for the co-chairs

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                 or other RMC members, if any, may be appointed at any time by
                 written notice to the other Party prior to any meeting of the
                 RMC. All RMC members shall be full time employees of DIVERSA
                 and DOW. If either Party desires that an employee of an
                 Affiliate or a consultant attend an RMC meeting, then such
                 consultant to a Party must be under confidentiality obligations
                 to that Party having terms at least a strict as those of this
                 Agreement, must be approved in writing to attend by the other
                 Party, and such person has no vote in the decisions of the RMC.
                 The initial co-chairs and other RMC members are identified in
                 Appendix [*****] attached hereto and made a part hereof, which
                 Appendix shall be updated in writing from time to time to
                 reflect any changes in RMC membership.

          2.2.3  Meetings.
                 --------

                 The RMC shall meet at least quarterly, with such meetings
                 alternating between [*****], and [*****], unless the Parties
                 agree otherwise. The first such meeting shall be held in
                 [*****] within [*****] days after the Effective Date at which
                 time the initial [*****] Plans shall be finalized. Any
                 additional meetings, other than [*****], shall be held at
                 places and on dates selected by the co-chairs of the RMC. RMC
                 members may participate in any such meeting in person, by
                 telephone or by videoconference. In addition, the RMC may act
                 without a formal meeting by a written memorandum signed by the
                 co-chairs of the RMC. Subject to the obligations set forth in
                 Article 6, other full-time employees of each Party, in addition
                 to the members of the RMC, may attend RMC meetings as nonvoting
                 observers at the invitation of either Party with the prior
                 written approval of the other Party.

          2.2.4  Minutes.
                 -------

                 The RMC shall keep minutes of its meetings that record all
                 decisions and all actions recommended or taken. The Party
                 hosting the meeting shall be responsible for the preparation of
                 the meeting agenda and preparation and circulation of the draft
                 minutes. Draft minutes shall be delivered by mail, electronic
                 mail or facsimile to the co-chairs of the RMC within [*****]
                 after each meeting. Any intellectual property issues that may
                 need attention will be highlighted and forwarded to each
                 Party's Patent Coordinator. Draft minutes shall be edited by
                 the co-chairs and shall be issued in final form only with their
                 approval and agreement as evidenced by their signatures on the
                 minutes. A copy of the signed minutes shall be retained in each
                 Party's files for at least [*****] after termination of this
                 Agreement.

          2.2.5  Quorum; Voting; Decisions.
                 -------------------------

                 At each RMC meeting, at least [*****] members appointed by each
                 Party shall constitute a quorum and decisions shall be made by
                 [*****] vote. If the RMC is unable to reach agreement on any
                 matter, such dispute shall be

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                 settled pursuant to Article 13 below.

          2.2.6  Expenses.
                 --------

                 DIVERSA and DOW shall [*****] expenses of their respective RMC
                 members related to their participation on the RMC and
                 attendance at RMC meetings.

     2.3  Third Party Licenses.
          --------------------

          2.3.1  DOW Responsibility.
                 ------------------

                 In the event that DOW can reasonably demonstrate that [*****]
                 of a Third Party's patent rights would [*****] under a [*****]
                 Plan, then DOW shall so notify DIVERSA. DIVERSA shall state
                 whether it has obtained or is planning to obtain [*****] of the
                 [*****] Plan to go forward. If DOW elects to [*****], then the
                 RMC may amend the [*****] Plan if only DOW can [*****]. If DOW
                 and DIVERSA elect not to [*****], then the [*****] Plan shall
                 be altered by the RMC to enable the performance of the modified
                 [*****] Plan.

          2.3.2  DIVERSA Responsibility.
                 ----------------------

                 In the event that it is necessary to [*****] to perform the R&D
                 Program with regard to [*****] provided by DIVERSA, including,
                 without limitation, [*****], DIVERSA will be responsible for
                 the payment of any amounts due to Third Parties for the [*****]
                 for the performance of the R&D Program with regard to such
                 [*****] and the costs of [*****]. The decision [*****] shall be
                 solely DIVERSA's, and DOW shall be notified of that decision.

                 Notwithstanding the foregoing, DIVERSA shall be responsible for
                 [*****] for use of an [*****] Enzyme. DIVERSA and DOW shall
                 promptly notify the other Party in writing of any allegation by
                 a Third Party that the use of an [*****] Enzyme [*****]. If DOW
                 believes that a [*****] to use an [*****] Enzyme, then DOW
                 shall express its concerns to DIVERSA in writing. DIVERSA shall
                 explain to DOW whether it agrees that a [*****] and shall
                 provide sufficient explanation and reasons for its answer.
                 Should DIVERSA be aware and concerned of such [*****] or be
                 considering, instituting or have instituted a [*****], then all
                 such [*****] by DIVERSA. The decision whether such a license is
                 required shall be DIVERSA's. Notwithstanding the foregoing,
                 DIVERSA shall

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                 use good faith efforts to terminate [*****].

          2.3.3  Infringement Claims.
                 -------------------

                 In the event that DOW or DIVERSA receives a written notice of
                 an allegation of possible patent infringement from a Third
                 Party or determines that there is such possible infringement
                 based on (i) the use of a particular [*****], which has been or
                 is planned to be used in the conduct of the R&D Program, or
                 (ii) the use of an [*****] Enzyme or Confidential Information
                 of DIVERSA [*****], such Party shall, within [*****] days,
                 notify the other Party in writing and provide an explanation of
                 the circumstances. If such possible infringement is of concern
                 to DOW, DIVERSA may provide a [*****] to DOW from [*****],
                 which may be based on a [*****], explaining DIVERSA's position
                 and the bases therefore.

                 In such event if no prior legal opinion has been done such that
                 the [*****], then the Parties shall forward a copy of such
                 claim to a [*****] and request that such [*****]. The cost of
                 this review shall be borne by [*****]. If the [*****] that the
                 activities of the R&D Program with respect to the [*****] would
                 be found by a court of competent jurisdiction to infringe a
                 claim of the Third Party patent which is likely to be found
                 valid, then within [*****] days of such [*****], either

                 (i)   a [*****] will be substituted by DIVERSA for use in the
                 [*****] Enzyme in the R&D Program, subject to the approval of
                 the RMC, or

                 (ii)  DIVERSA will notify DOW that it will [*****] from such
                 Third Party for any intellectual property rights necessary for
                 use of the [*****] in the R&D Program pursuant to Section
                 2.3.2, or

                 (iii) if the claim relates to alleged infringement of [*****]
                 used to obtain a [*****] an [*****] Enzyme, DIVERSA will
                 determine if an alternative technology could be used that does
                 not infringe the claim of such Third Party patent, and propose
                 to the RMC that such [*****], whereupon any [*****] Plan
                 relating to the aforementioned [*****] Enzyme will be modified
                 by the RMC; or

                 (iv)  the RMC may elect to cease to conduct any activity in the
                 R&D Program requiring the use of [*****] and, if necessary,
                 reallocate DIVERSA's FTEs to other activities within the R&D
                 Program,

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                 If either (i), (ii), (iii), or (iv) above is not satisfied
                 within [*****], DOW may, upon written notice to DIVERSA,
                 immediately terminate this Agreement and cease all payments,
                 after such notice, except for work performed prior to receipt
                 of such notice by DIVERSA and the payment due under Section
                 10.4.

2.4  Post Research Term Cooperation.
     ------------------------------

     At least [*****] months prior to the expiration of the Research Term, the
     Parties shall meet to agree on mechanisms for coordinating and managing
     activities (including, but not limited to, patent prosecution and
     publication review) that will occur after the expiration of the Research
     Term which would otherwise be addressed by the RMC. Any patent applications
     included in Intellectual Property or Joint Intellectual Property which have
     not been filed shall be filed in the first instance during the Agreement
     Term, and both Parties shall cooperate with respect to all issues and
     formal papers. As part of such considerations, if any research project has
     not yet resulted in a Licensed [*****] and requires reasonable additional
     development to accomplish such result, and either the RMC notifies DOW and
     DIVERSA at its last meeting of this development request or DOW notifies
     DIVERSA not later than [*****] months after the expiration of the Research
     Term that DOW wishes to continue such research project with the help of
     DIVERSA, then DIVERSA agrees to consider in good faith the terms of such a
     continuation as proposed by DOW, which, in any event, will include the
     undertaking by DIVERSA to give to DOW access to experienced DIVERSA FTEs to
     be employed in the diligent continuation of the research project at the
     same cost as set forth in Section 4.4 hereof plus [*****]. Notwithstanding
     the foregoing, in no event will DIVERSA be obligated to continue any
     Research [*****] beyond the Research Term. Should DIVERSA elect not to
     continue with such incomplete [*****], then DOW is permitted to continue
     such [*****] in any manner, including with a Third Party, but without the
     use of DIVERSA Intellectual Property.

2.5  Research Exclusivity.
     --------------------

     During the Research Term, DIVERSA will not collaborate with or license the
     rights to any Third Party to use any [*****] Enzyme in a Research [*****]
     to convert a Research [*****] to a [*****], as defined in Appendix [*****],
     so long as DOW satisfies the diligence obligations set forth in the [*****]
     Plan with respect to the development of the applicable [*****] Enzyme.
     During the Research Term, DOW will not collaborate with or license the
     rights to any Third Party to evolve any enzyme in a Research [*****] to
     convert a Research [*****] to a [*****], as defined in Appendix [*****].

Article 3.  LICENSE RIGHTS

3.1  To DOW.
     ------

     (a)  Subject to the terms and conditions of this Agreement, DIVERSA hereby
          grants to DOW a non-exclusive, nonsublicensable, royalty-free,

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          worldwide license under the specific DIVERSA Intellectual Property
          listed on Appendix [*****] and Appendix [*****] (attached hereto and
          made a part hereof) to all Research [*****] using any Licensed [*****]
          to make, have made, import, have imported, use, have used, sell, have
          sold and otherwise exploit Royalty Bearing Products (as defined in the
          License Agreement), and a royalty-free license to all DIVERSA Know-How
          required for DOW to commercialize Royalty Bearing Products, and the
          [*****] provided to DOW by DIVERSA hereunder solely to conduct the R&D
          Program. DOW (i) shall promptly notify DIVERSA in writing of any
          improvements to the DIVERSA Intellectual Property conceived of or
          developed by DOW during the Research Term (the "Improvements"), and
          (ii) shall irrevocably assign to DIVERSA all right, title and interest
          in and to such Improvements. Such Improvements shall be included in
          the DIVERSA Intellectual Property licensed to DOW under this Section
          3.1 and under the License Agreement.

     (b)  Should DOW determine that modification of an [*****] Enzyme is
          required, after it has been provided to DOW by DIVERSA under the terms
          of this Agreement, to make the Licensed [*****] related to such
          [*****] Enzyme [*****], then DOW may request that DIVERSA perform such
          added modification under the R&D Program or, if this Agreement has
          terminated, then under terms to be negotiated in good faith by the
          Parties. DOW may use the [*****] or request that a Third Party perform
          the desired modifications of an [*****] Enzyme:

               (1) if DIVERSA is unwilling to perform such added modification,
               or

               (2) upon (i) the transfer or sale of all or substantially all of
               the business of DIVERSA to which this Agreement relates, whether
               by merger, sale of stock, sale of assets or otherwise, to a
               [*****], or (ii) the bankruptcy, insolvency, dissolution or
               winding up of DIVERSA (other than dissolution or winding up for
               the purposes of [*****]), then DOW or its Affiliates may modify
               the [*****] Enzyme to make the Licensed [*****] related to the
               [*****] Enzyme commercially viable and DOW continues to be able
               to use DIVERSA Intellectual Property listed in Appendix [*****]
               (attached hereto and made a part hereof) solely to modify the
               [*****] Enzyme and/or the Licensed [*****] related to the [*****]
               Enzyme, provided that DOW pays DIVERSA for the [*****].

     (c)  Notwithstanding the foregoing Sections 3.1 (a) and (b), DOW (or DOW
          with its consultants or though a separate agreement between DOW and a
          Third Party) may

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          conduct independent research activities outside the R&D Program,
          whether within the Areas of Interest or not, and [*****], but except
          as otherwise agreed to by DIVERSA in writing, DOW agrees that it will
          not itself or through any Third Party use any DIVERSA Intellectual
          Property, Joint Intellectual Property and/or Research [*****] to
          develop a [*****] Licensed [*****], except under the terms of this
          Agreement.

3.2  To DIVERSA.
     ----------

     Subject to the terms and conditions of this Agreement, DOW hereby grants to
     DIVERSA (i) a nonexclusive, nontransferable, nonsublicensable, royalty-
     free, worldwide research license to DOW Intellectual Property, where
     legally possible, and the [*****] provided to DIVERSA by DOW, solely to
     conduct the R&D Program, and (ii) a nonexclusive, nontransferable,
     nonsublicensable, royalty-free, worldwide license under any patents, trade
     secrets and other intellectual property Controlled by DOW that relate to
     [*****] Enzymes in the R&D Program.

3.3  Assignment.
     ----------

     3.3.1  DOW.
            ---

            DOW shall have the right to assign its rights in the license granted
            herein (or any part thereof) to an Affiliate; provided, however,
            that DOW shall continue to be responsible for the obligations of any
            such Affiliate. DOW may assign its rights hereunder in connection
            with the transfer or sale of all or substantially all of the
            business of DOW to which this Agreement relates, whether by merger,
            sale of stock, sale of assets or otherwise.

     3.3.2  DIVERSA.
            -------

            DIVERSA shall have no right to assign its rights in the licenses
            granted to it by DOW pursuant to Section 3.2 hereof (or any part
            thereof) to any of its Affiliates or any Third Party, except in
            connection with the transfer or sale of all or substantially all of
            the business of DIVERSA to which this Agreement relates, whether by
            merger, sale of stock, sale of assets or otherwise. If DIVERSA is
            acquired by a Third Party [*****] for Research [*****] or if DIVERSA
            is controlled by merger, sale of stock, sale of assets or otherwise
            to a Third Party competitor, then prior to closure of such
            acquisition, DOW shall be informed of the identity of the Third
            Party competitor and at DOW's sole discretion can elect to terminate
            this Agreement under Section 10.4 and request in writing immediate
            return of all Confidential Information.

3.4  Retained Rights.
     ----------------

     3.4.1  DIVERSA.
            -------

            DIVERSA shall retain all right, title and interest in and to the
            DIVERSA

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            Intellectual Property and Joint Intellectual Property, except as
            expressly granted to DOW in Section 3.1 or in the License Agreement.

            DIVERSA may grant to Third Parties licenses under the Diversa
            Intellectual Property for use of [*****] Enzymes; provided, however,
            that such licenses do not conflict with the license granted to DOW
            herein or under the License Agreement, and provided that in the
            event the [*****] Enzyme is a [*****] provided by DOW to DIVERSA
            under the terms of this Agreement, DIVERSA obtains DOW's prior
            written consent (which may be withheld for any reason) and pays a
            reasonable royalty to DOW in accordance with a separate license
            agreement to be negotiated in good faith between the Parties.
            DIVERSA shall inform DOW of the application(s) for an [*****] Enzyme
            that is intended transferred to a Third Party if the [*****] Enzyme
            is a [*****] provided by DOW to DIVERSA under the terms of this
            Agreement.

            Notwithstanding the license granted to DOW in Section 3.1, DIVERSA
            shall retain the right to use all [*****] Enzymes for its own
            research purposes (i.e., to develop, improve and validate its
            technology and intellectual property).

     3.4.2  DOW.
            ---

            DOW shall retain all right, title and interest in and to the DOW
            Intellectual Property and Joint Intellectual Property, except as not
            expressly granted to DIVERSA in Section 3.2; provided, however, that
            during the Agreement Term, DOW shall not grant any license under the
            DOW Intellectual Property or Joint Intellectual Property which
            conflicts with the license granted to DIVERSA herein.

Article 4.  PAYMENTS

4.1  Technology Development.
     ----------------------

     Within [*****] days after the Effective Date, DOW shall pay to DIVERSA a
     technology development fee of One Million Five Hundred Thousand
     (US$1,500,000) Dollars, and shall similarly provide DIVERSA with a
     technology development fee of One Million Five Hundred Thousand
     (US$1,500,000) Dollars, during the Agreement Term, within [*****] days of
     each of the successive two anniversary dates of the Effective Date.

     Thus within [*****] days after the Effective date, DOW shall pay to DIVERSA
     a technology development fee of One Million Five Hundred Thousand
     (US$1,500,000) Dollars and Nine Hundred Thousand (US$900,000)
     Dollars for the first quarter FTE payment under Section 4.4 for a total of
     Two Million Four Hundred Thousand (US$2,400,000) Dollars.

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4.2  Milestone Payments.
     ------------------

     DOW shall make milestone payments to DIVERSA as set forth in Appendix
     [*****] attached hereto and made a part hereof. The RMC shall determine
     whether DIVERSA has achieved a milestone and shall note such decision in
     its signed minutes. If the RMC cannot reach a decision, then Article 13
     shall control. The milestone goal achievements shall be determined [*****]
     by the RMC at its meeting [*****], shall be performance driven goals, and
     shall be paid by DOW to DIVERSA [*****] days after the determination has
     been made by the RMC that the milestone was met. The amount of milestone
     payments in a given year may be up to [*****] Dollars for all [*****]
     Plans.

4.3  Payments.
     --------

     All payments due under this Agreement shall be made in accord with the
     respective sections of Article 4 by bank wire transfer in immediately
     available funds to a bank account designated in writing to DOW by DIVERSA.
     In the event that the due date of any payment subject to this Article 4
     hereof is a Saturday, Sunday or national holiday, such payment may be paid
     on the following business day. Any late payments shall bear interest to the
     extent permitted by applicable law at the prime rate (as reported by the
     Bank of America, San Francisco, California, or its successor), on the date
     such payment is due plus an additional [*****], calculated on the number of
     days such payment is delinquent. The rights provided in this Section 4.3
     shall in no way limit any other remedies available to DIVERSA hereunder.

4.4  FTE Payments.
     ------------

     4.4.1  In addition to the other payments due pursuant to this Article 4,
            DOW will pay to DIVERSA a nonrefundable amount of Three Million Six
            Hundred Thousand (US$3,600,000) Dollars per year for the 12 FTEs
            set forth in Section 2.1.1(d) for each of the three years of the
            Research Term, commencing as of the Effective Date.

     4.4.2  Payments due pursuant to the above Section 4.4.1 shall be made in
            advance, on or before the first day of each calendar quarter, with
            the first and last payments prorated in the event that the Effective
            Date is not the first day of a calendar quarter. Should payment be
            due on a Saturday, Sunday or national holiday, such payment may be
            paid on the following business day. In the event that the Parties
            agree to a different Staffing Level for any given calendar quarter,
            the payment set forth in this Section 4.4 shall be prorated
            accordingly based on a level of funding of [*****] Dollars per year
            per FTE. Any change in the amount of the FTE payment due in a
            quarter shall be reported to DOW by DIVERSA in writing [*****] days
            in advance of such payment.

Article 5.  LICENSE AGREEMENT; DEVELOPMENT REPORTS

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5.1  License Agreement.
     -----------------

     The Parties have entered into a License Agreement covering [*****] Enzymes
     and Licensed [*****] executed contemporaneously with this Agreement, a copy
     of which is attached hereto for reference as Appendix [*****]. DIVERSA
     hereby represents:

     (a)  that it is willing and able to grant to DOW

          (i)  an exclusive, royalty bearing, worldwide license under the
               DIVERSA Intellectual Property to use the [*****] Enzymes and the
               [*****] the [*****] Enzymes in a Research [*****] to make, have
               made, use, sell, offer for sale and import Royalty Bearing
               Products (as defined in the License Agreement), and

          (ii) a non-exclusive, royalty bearing, worldwide license under DIVERSA
               Intellectual Property to improve Licensed [*****]; and

     (b)  that to the best of its knowledge, there are [*****] required for DOW
          to practice the DIVERSA Intellectual Property.

5.2  DOW may perform research within the Areas of Interest independent of this
     Agreement.  If DOW desires that a Third Party assist DOW in such research,
     it shall be in accordance with Sections 3.1, 3.3 and 3.4.

Article 6.  TREATMENT OF CONFIDENTIAL INFORMATION

6.1  Confidentiality.
     ---------------

     6.1.1  General.
            -------

            (a)   DIVERSA and DOW each recognize that the other Party's
                  Confidential Information constitutes highly valuable and
                  proprietary confidential information. Subject to the terms and
                  conditions of Article 8, DIVERSA and DOW agree that, except as
                  required by applicable law, rule or regulation (including the
                  filing and prosecution of patent applications) or judicial or
                  administrative order, during the Agreement Term and for
                  [*****] years thereafter, unless these terms are modified by
                  the License Agreement after the expiration of the Agreement
                  Term that:

                         (i)  it will keep confidential and will cause its
                              employees, consultants, and Affiliates, to keep
                              confidential, all Confidential Information of the
                              other Party that is disclosed to it, or to any of
                              its employees or consultants, under or in
                              connection with this Agreement; and

                         (ii) neither it nor any of its respective employees,
                              consultants or Affiliates shall use Confidential
                              Information of the other Party for any purpose
                              whatsoever, except as expressly permitted in this
                              Agreement.

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            (b)   Notwithstanding subsection (a) above:

                         (i)  either Party may disclose the other Party's
                         Confidential Information to the extent reasonably
                         necessary in prosecuting or defending litigation,
                         complying with applicable governmental regulations or
                         court orders or otherwise submitting information to tax
                         or other governmental authorities; provided that, if a
                         Party is required to make any such disclosure of the
                         other Party's Confidential Information, it will give
                         reasonable advance notice to the other Party of such
                         disclosure and will use reasonable efforts to secure
                         confidential treatment of such Confidential Information
                         (whether through protective orders or otherwise); and

                         (ii) the Parties will reasonably cooperate with each
                         other in the making of reasonable disclosures of
                         Confidential Information to actual and potential
                         agents, investment bankers, investors and potential
                         investors of each Party; provided, however, that such
                         disclosures shall be critically required for an
                         investment objective, notice shall be provided to the
                         Party who owns the Confidential Information to protect
                         its rights, and only be made under the terms of a
                         confidentiality agreement providing protections no less
                         stringent than those contained herein.

     6.1.2  Restricted Access.
            -----------------

            (a)  Disclosure of a Party's Confidential Information to any of the
                 officers, employees, consultants or agents of the other Party
                 shall be made only if and to the extent necessary to carry out
                 rights and responsibilities under this Agreement, shall be
                 limited to the maximum extent possible, consistent with such
                 rights and responsibilities, and shall only be made to persons
                 who are bound to maintain the confidentiality thereof and not
                 to use such Confidential Information except as expressly
                 permitted by this Agreement. If DOW discloses any DIVERSA
                 Confidential Information to [*****], it shall do so under these
                 same terms and conditions of this Section 6.1.2.

            (b)  Each Party shall use at least the same standard of care, but no
                 less than a reasonable standard of care for this industry, as
                 it uses to protect its own Confidential Information to ensure
                 that its [*****], employees, agents, consultants and other
                 representatives do not disclose or make any unauthorized use of
                 Confidential Information of the other Party. Each Party shall
                 promptly notify the other Party of any unauthorized use or
                 disclosure of Confidential Information of the other Party.

            (c)  Within [*****] days following termination or expiration of this
                 Agreement, each Party will return to the other Party, or
                 destroy, upon the written request of the other Party, all
                 Confidential

                                      23      * Confidential Treatment Requested
<PAGE>

                 Information disclosed to it by the other Party pursuant to this
                 Agreement, including all copies and extracts of documents;
                 provided that a Party may retain Confidential Information of
                 the other Party relating to any license or right to use
                 Intellectual Property that survives such termination and one
                 copy of all other Confidential Information may be retained in
                 confidential and inactive archives solely for the purpose of
                 establishing the contents thereof and to determine the
                 continuing obligations of each Party.

     6.1.3  Employee Confidentiality Agreements.
            -----------------------------------

            DIVERSA and DOW each represent that all of its employees and any
            consultants to such Party participating in the R&D Program or who
            shall otherwise have access to Confidential Information of the other
            Party are bound by written agreements to maintain such information
            in confidence and not to use such information except as expressly
            permitted herein. Each Party agrees to [*****] by which its
            employees and consultants are bound.

6.2  Publicity.
     ---------

     Except as expressly provided herein, neither Party may disclose the
     existence or terms of this Agreement without the prior written consent of
     the other Party; provided, however, that either Party may make such
     disclosure to the extent required by law and that either Party may make a
     disclosure of the existence of this Agreement to its attorneys, advisers,
     investors, prospective investors, lenders and other financing sources,
     under circumstances that reasonably ensure the confidentiality thereof.

     Notwithstanding the foregoing, the Parties shall mutually agree upon a
     press release to announce the execution of this Agreement, together with a
     corresponding Q&A outline for use in responding to inquiries about the
     Agreement; thereafter, DOW and DIVERSA may each disclose to Third Parties
     the information contained in such press release and Q&A outline without the
     need for further approval by the other Party. In no event shall the
     financial terms of this Agreement be publicly disclosed, except to the
     extent required by any Securities and Exchange Commission filings or
     regulations, but all financial terms must be redacted prior to submission.
     In addition, DIVERSA may (i) make public statements regarding Licensed
     [*****] by announcing in general terms the achievement of milestones,
     following consultation with DOW and with the prior written consent of DOW,
     and (ii) without the prior consent of DOW, make public statements, without
     identifying DOW, regarding the overall success rate(s) achieved by and/or
     for its customers with the use of its technology, including a general
     description of activities undertaken in connection with the R&D Program,
     and success of such activities. DOW is free to make public statements,
     press releases, and the like, with respect to Licensed [*****].

6.3  Publication.
     -----------

     A Party wishing to publish or otherwise publicly disclose its Research
     [*****] shall first submit a draft of the proposed manuscripts
     simultaneously to all members of the RMC

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<PAGE>

     for review by the other Party at least [*****] days prior to any submission
     for publication or other public disclosure. To avoid loss of patent rights
     as a result of premature public disclosure of patentable information, the
     reviewing Party shall notify the submitting Party in writing within [*****]
     days after receipt of such proposed disclosure whether the reviewing Party
     desires that a patent application be filed on any invention disclosed in
     such proposed disclosure. In the event that the reviewing Party desires
     such filing, the submitting Party shall withhold publication or disclosure
     of such proposed disclosure until the earlier of (i) the date a patent
     application is filed thereon, or (ii) the date the Parties determine after
     consultation that no patentable invention exists, or (iii) [*****] days
     after receipt by the submitting Party of the reviewing Party's written
     notice of the reviewing Party's desire to file such patent application. If
     the proposed disclosure contains Confidential Information of the reviewing
     Party that is subject to nondisclosure obligations under this Article 6,
     the submitting Party agrees to remove such Confidential Information upon
     request of the reviewing Party.

Article 7.  INTELLECTUAL PROPERTY RIGHTS

7.1  Disclosure of Inventions.
     ------------------------

     Each Party shall promptly inform the RMC of all Research [*****] relevant
     to the progress of each [*****] Plan towards its pre-agreed goals, in
     accordance with a procedure established by the RMC.

7.2  Ownership.
     ---------

     All intellectual property rights, which are in possession of either Party
     as of the Effective Date, shall remain in the possession of that Party.
     Ownership of inventions conceived of during the course of the collaboration
     in the Areas of Interest (the "Inventions") will be as follows:

     7.2.1  DIVERSA Intellectual Property Rights.
            ------------------------------------

            DIVERSA shall have sole and exclusive ownership of all right, title
            and interest on a worldwide basis in and to any DIVERSA Research
            Results.

     7.2.2  DOW Intellectual Property Rights.
            --------------------------------

            DOW shall have sole and exclusive ownership of all right, title and
            interest on a worldwide basis in and to any DOW Research Results.

     7.2.3  Joint Intellectual Property Rights.
            ----------------------------------

            DOW and DIVERSA shall jointly own all Joint Research Results.

     7.2.4  Inventions Relating to [*****] Enzymes or Licensed Products.
            -----------------------------------------------------------

            Notwithstanding the foregoing, (i) DIVERSA will own all Inventions
            relating to compositions of matter, uses or methods of, or otherwise
            involving, any [*****] Enzyme or [*****] except for Joint
            Intellectual Property

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<PAGE>

            or [*****] supplied by DOW, and (ii) DOW will own all Inventions
            relating to compositions of matter, uses or methods of, or otherwise
            involving, products made by Licensed [*****] in the Areas of
            Interest. If the product made by the Licensed [*****] is within the
            Field but outside the Areas of Interest, then DOW shall have a right
            of first refusal for a reasonable time to obtain rights for that use
            under a separate license agreement.

7.3  Patent Coordinators.
     -------------------

     DIVERSA and DOW shall each appoint a patent coordinator ("Patent
     Coordinator") who shall serve as such Party's primary liaison with the
     other Party on matters relating to ownership of Inventions, inventorship,
     patent filing, prosecution, maintenance and enforcement.  Each Party may
     replace its Patent Coordinator at any time by notice in writing to the
     other Party.  The initial Patent Coordinator from DIVERSA is [*****] and
     from DOW is [*****].

7.4  Inventorship.
     ------------

     Except as specifically provided above, ownership of Inventions and
     inventorship shall be determined by the Patent Coordinators in accordance
     with United States patent law.  If the Patent Coordinators can not agree on
     inventorship or ownership of Inventions, then a neutral patent attorney
     acceptable to both Parties shall make the determination, with each Party
     [*****].

7.5  Deposits.
     --------

     Should deposits of the [*****] Enzyme or Licensed [*****] be desired by
     either Party to support the filing of a patent application, both Parties
     agree to cooperate to enable and obtain such deposit.  Ownership of and
     costs for the deposit shall be borne by the Party responsible in accordance
     with Article 8.

Article 8.  PROVISIONS CONCERNING THE FILING, PROSECUTION AND MAINTENANCE OF
            PATENT RIGHTS

     The following provisions relate to the filing, prosecution and maintenance
of Patent Rights claiming Inventions.

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8.1  Filing and Prosecution of Patents.
     ---------------------------------

     8.1.1  Primary Responsibilities.
            ------------------------

            In consultation with the Patent Coordinators, the RMC will
            coordinate the determination of what patents will be filed on
            Research [*****]. Unless the RMC agrees otherwise in writing, the
            Parties shall have the following responsibilities for patent filing,
            prosecution and maintenance (including the defense of interferences,
            oppositions and similar proceedings) (collectively, "Patent
            Activities"):

            (a)  Royalty Bearing Products (as defined in the License Agreement).
                 --------------------------------------------------------------
                 DOW will be responsible, at its sole expense, for Patent
                 Activities with respect to Inventions made by DIVERSA or DOW or
                 Jointly Developed relating primarily to Royalty Bearing
                 Products and [*****] that use [*****] Enzymes and/or [*****]
                 Enzymes that make Royalty Bearing Products (as defined in the
                 License Agreement) in accordance with Section 7.2.4 (ii).

            (b)  Improved Enzymes.  DIVERSA will be responsible, at its sole
                 -----------------
                 expense, for Patent Activities with respect to Inventions made
                 by DIVERSA or DOW or Jointly Developed relating primarily to
                 [*****] Enzymes in accordance with Section 7.2.4 (i).

            (c)  All Other Inventions.  DOW will be responsible, at its sole
                 --------------------
                 expense, for Patent Activities with respect to Inventions made
                 solely by DOW not otherwise covered in Section 8.1.1 (a) and
                 (b). DIVERSA will be responsible, at its sole expense, for
                 Patent Activities with respect to Inventions made solely by
                 DIVERSA not otherwise covered in Section 8.1.1 (a) and (b). In
                 the case of Inventions Jointly Developed not otherwise covered
                 in Section 8.1.1, Patent Activities shall be conducted by
                 outside counsel, reasonably acceptable to both Parties, with
                 equal control and joint responsibility for costs incurred in
                 connection with the applicable Patent Activities.

     8.1.2  Cooperation.
            -----------

            In each case in Section 8.1.1 above, the Party responsible for
            Patent Activities for the applicable patent applications (the
            "Responsible Party") shall use reasonable efforts to obtain patent
            coverage that is as broad as possible to [*****] thereof. Each Party
            shall be kept informed of all substantive matters relating to the
            preparation and prosecution of all patent applications under the
            Joint Patent Rights.

8.2  Elective Termination of Rights.
     ------------------------------

     If at any time the Responsible Party does not wish to file any patent
     application or

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<PAGE>

     wishes to discontinue the prosecution or maintenance of any Patent Rights
     claiming any [*****] Enzyme or Licensed [*****] filed in any country, it
     shall promptly give notice of such intention to the other Party. The latter
     shall have the right, [*****], to assume responsibility for
     the filing, prosecution or maintenance of any such Patent Rights on a
     country-by-country basis at its own expense, by giving notice to the
     Responsible Party of such intention within [*****] days. No assignment of
     Patent Rights shall occur to the other Party unless specifically agreed to
     under appropriate negotiated terms and conditions. In any such case, the
     Party declining such responsibilities shall not grant any Third Party a
     license under its interest in the applicable Patent Rights in the
     applicable country or countries and may not practice the applicable Patent
     Rights for any commercial use (but may practice, royalty free such Patent
     Rights for research use) without the prior written consent of the other
     Party. The other Party will bear the costs of Patent Activities with
     respect to all Patent Rights for which it has assumed responsibility
     pursuant to this Section 8.2.

Article 9.  LEGAL ACTION

9.1  Actual or Threatened Infringement.
     ---------------------------------

     9.1.1  Notice.
            ------

            In the event either Party becomes aware any where in the world of
            any actual or threatened commercially material infringement or
            unauthorized possession, knowledge or use of any Patent Rights
            (collectively, an "Infringement"), that Party shall, within 60 days,
            notify the other Party and provide it with all available details to
            the extent it is legally permitted to do so. The [*****].

     9.1.2  Primary Responsibility.
            ----------------------

            (a)  Notwithstanding the foregoing, if the Parties do not otherwise
                 agree on a course of action, DOW shall have primary
                 responsibility for the prosecution, prevention or termination
                 of any Infringement of DOW's Patent Rights hereunder, at DOW's
                 expense and with the sharing of recoveries as specified below.

            (b)  DIVERSA shall have primary responsibility for the prosecution,
                 prevention or termination of any Infringement of DIVERSA's
                 Patent Rights, at DIVERSA's expense and with the sharing of
                 recoveries as specified below.

            If either Party which has primary responsibility as described in (a)
            or (b) above determines that it is necessary or desirable for the
            other Party to join any such suit, action or proceeding, the other
            Party shall execute all papers and perform such other acts as may be
            reasonably required in the circumstances, at the

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            expense of the Party which has primary responsibility.

     9.1.3  Jointly-Owned Patents.
            ---------------------

            In the event of an Infringement of Joint Patent Rights, the Parties
            shall agree which Party will have the rights and responsibilities of
            abating such Infringement, and how the expenses and any recovery
            thereof shall be shared. In this event, the responsible Party shall
            [*****], and shall keep the other Party fully informed as to the
            status of such matters. In the event only one Party wishes to pursue
            such proceeding, it shall have the right to proceed alone, at its
            expense, and may retain any recovery, and the other Party agrees, at
            the request and expense of the Party initiating such action, to
            cooperate and join in any proceedings in the event that a Third
            Party asserts that the co-owner of such Joint Invention is necessary
            or indispensable to such proceedings.

     9.1.4  Costs.
            -----

            DOW shall bear the cost of any proceeding or suit under this Section
            9.1 brought by DOW; DIVERSA shall bear the cost of any such
            proceeding or suit brought by DIVERSA. In each such case, the
            Responsible Party shall have the right first to [*****] in such suit
            or in [*****] incurred by such Party, including [*****]. The
            remainder shall [*****] so incurred. Any remaining amounts or any
            non-monetary recovery shall be kept by the Responsible Party. If the
            suit results in damages being owed to a Third Party, then the
            Responsible Party [*****], except if the suit is based on Joint
            Patent Rights and both Parties are actively involved, then the costs
            and damages are to [*****].

     9.1.5  Separate Counsel.
            ----------------

            Each Party shall always have the right to be represented by counsel
            of its own selection and at its own expense in any suit instituted
            under this Section 9.1 by the other Party for an Infringement.

     9.1.6  Standing.
            --------

            If either Party lacks standing and the other Party has standing to
            bring any such suit, action or proceeding as specified above, then
            the Responsible Party may request the other Party to do so at the
            Responsible Party's expense. The Party with standing is under no
            obligation to comply with such request, but rather is free to refuse
            such request.

     9.1.7  Cooperation.
            -----------

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<PAGE>

            In any action under this Section 9.1, each Party shall fully
            cooperate with and assist the other Party as reasonably requested.
            No suit regarding DIVERSA Intellectual Property or Joint
            Intellectual Property may be settled by DOW without DIVERSA's prior
            written consent. No suit regarding DOW Intellectual Property or
            Joint Intellectual Property may be settled by DIVERSA without DOW's
            prior written consent.

9.2  Defense of Claims Asserted by Third Parties Against DOW.
     -------------------------------------------------------

     DOW shall indemnify DIVERSA for the development, manufacture, use,
     handling, storage, sale or other disposition of Licensed [*****] or
     Research [*****] by DOW or its Affiliates during the Agreement Term.

9.3. Defense of Claims Asserted by Third Parties Against DIVERSA.
     -----------------------------------------------------------

     DIVERSA shall indemnify DOW for the development, manufacture, use,
     handling, storage, sale or other disposition of [*****] Enzyme or Research
     [*****] by DIVERSA or its Affiliates during the Agreement Term.

9.4  Notice.
     ------
     DOW or DIVERSA shall notify the other in accord with Section 14.1 of any
     suits or claims or proceedings brought against it under Section 9.2 or 9.3,
     respectively.

Article 10.  TERMINATION AND DISENGAGEMENT

10.1 Term.
     ----

     This Agreement shall be effective as of the Effective Date and, unless
     otherwise terminated earlier pursuant to this Agreement, shall continue in
     full force and effect until the end of the Agreement Term.  Nevertheless,
     this Agreement may be terminated at any time upon mutual written agreement
     of the Parties, provided that DOW pays any actual costs to DIVERSA done
     under the [*****] Plans until the date of termination.

10.2 Material Breach.  In the event either Party has materially breached or
     ---------------
     defaulted in the performance of any of its obligations hereunder, the
     nonbreaching Party may terminate this Agreement. A material breach of this
     Agreement by a Party shall be deemed to have occurred:

          (a)  upon the failure of a Party to pay, when due, any amount due
               hereunder to the other Party, if such Party has not paid the
               amount due within [*****] days after receiving notice from the
               non-breaching Party of such failure to pay; or

          (b)  upon breach of any other material obligation or condition by a
               Party, if such Party has not cured such breach within [*****]
               days after receiving written notice from the nonbreaching Party
               of such breach. For this purpose a breach of a material
               obligation must result from a failure to meet that Party's
               representations,

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             warrantees, covenants or performance under the [*****] Plan.

10.3 Bankruptcy.
     ----------

     10.3.1  If either Party (the "Insolvent Party") files for protection under
             bankruptcy laws, makes an assignment for the benefit of creditors,
             appoints or suffers appointment of a receiver or trustee over its
             property, files a voluntary petition under any bankruptcy or
             insolvency act or has any such petition filed against it which is
             not discharged within [*****] days of the filing thereof, then the
             other Party may, at its sole election upon notice to the Insolvent
             Party, terminate this Agreement by written notice to such Party.

     10.3.2  All rights and licenses granted under or pursuant to this Agreement
             shall be deemed to be, for purposes of Section 365(n) of the U.S.
             Bankruptcy Code, licenses or rights to "intellectual property" as
             defined under Section 101(52) of the U.S. Bankruptcy Code. The
             Parties agree that each Party, as a licensee of such rights under
             this Agreement, shall retain and may fully exercise all of its
             rights and elections under the U.S. Bankruptcy Code, subject to
             performance by the licensee of its preexisting obligations under
             this Agreement.

10.4 Termination by DOW.
     ------------------

     DOW may terminate this Agreement upon 180 days prior written notice to
     DIVERSA; provided, however, that DOW shall pay to DIVERSA (i) [*****] upon
     termination of this Agreement during the [*****] following the Effective
     Date, and (ii) [*****] upon termination of this Agreement during the
     [*****] following the Effective Date. DOW may immediately terminate this
     Agreement in accord with Section 3.3.2 by providing 30 days written
     notice to DIVERSA and providing payment of any remaining technology
     development fees of Section 4.1 (but no payment of any remaining FTE fees
     under Section 4.4). Notwithstanding the foregoing, DIVERSA will not refund
     DOW any portion of any payments made under Section 4.4.

10.5 Effect of Termination; Accrued Obligations.
     ------------------------------------------

     10.5.1  Accrued Obligations.
             -------------------

             Termination of this Agreement for any reason shall not release any
             Party hereto from any liability which, at the time of such
             termination, has already accrued to the other Party or which is
             attributable to a period prior to such termination, nor preclude
             either Party from pursuing any rights and remedies it may have
             hereunder or at law or in equity which accrued or are based upon
             any event occurring prior to such termination.

     10.5.2  Licenses.
             --------

             (i) In the event that DOW terminates this Agreement to DIVERSA,
             pursuant to Section 10.2, then the R&D Program shall immediately
             terminate and all

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<PAGE>

             payments due by DOW to DIVERSA shall immediately terminate. This
             Agreement relates to research rights only and all commercial rights
             are stated in the License Agreement and are not affected hereby.

       (ii)  In the event DOW terminates the Agreement pursuant to Section 10.
             3.1, the licenses granted to DIVERSA in Article 3 shall terminate.

       (iii) In the event DIVERSA terminates the Agreement pursuant to Section
             10.3.1, the licenses granted to DOW in Article 3 shall terminate.

10.6 Surviving Provisions.
     --------------------

     Articles 12, 13 and 14 and Sections 6.1, 6.2, 7.2, 7.5, 10.5, 11.1.4 and
     11.1.5 of this Agreement shall survive the expiration or termination of
     this Agreement for any reason.

Article 11.  REPRESENTATIONS AND WARRANTIES

11.1 Mutual Representations.
     ----------------------

     DIVERSA and DOW each represents and warrants as follows:

     11.1.1  Organization.
             ------------

             It is a corporation duly organized, validly existing and is in good
             standing under the laws of the jurisdiction of its incorporation,
             is qualified to do business and in good standing as a foreign
             corporation in each jurisdiction in which the performance of its
             obligations hereunder requires such qualification and has all
             requisite power and authority, corporate or otherwise, to conduct
             its business as now being conducted, to own, lease and operate its
             properties and to execute, deliver and perform this Agreement.

     11.1.2  Authorization.
             -------------

             The execution, delivery and performance by it of this Agreement
             have been duly authorized by all necessary corporate action and do
             not and will not: (a) require any consent or approval of its
             stockholders or (b) violate any provision of any law, rule,
             regulation, order, writ, judgment, injunction, decree,
             determination or award presently in effect having applicability to
             it or any provision of its charter documents.

     11.1.3  Binding Agreement.
             -----------------

             This Agreement is a legal, valid and binding obligation of it,
             enforceable against it in accordance with its terms and conditions.

     11.1.4  Warranty Disclaimer.
             -------------------

             The Parties acknowledge that the research activities contemplated
             hereunder are experimental, and that the R&D Program may not be
             successful. EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN THIS
             AGREEMENT, NEITHER

                                      32
<PAGE>

             PARTY MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND, EXPRESS OR
             IMPLIED, WITH RESPECT TO ANY CONFIDENTIAL INFORMATION, PATENT
             RIGHTS, KNOW-HOW, [*****] ENZYMES, LICENSED [*****], OR OTHER
             TECHNOLOGY, GOODS, SERVICES, RIGHTS OR OTHER SUBJECT MATTER OF THIS
             AGREEMENT AND HEREBY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY,
             FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR VALIDITY OF
             TECHNOLOGY OR PATENT CLAIMS, ISSUED OR PENDING, WITH RESPECT TO ANY
             AND ALL OF THE FOREGOING.

     11.1.5  Limited Liability.
             -----------------

             EXCEPT AS EXPRESSLY PROVIDED HEREIN, NEITHER DIVERSA NOR DOW WILL
             BE LIABLE TO THE OTHER PARTY WITH RESPECT TO ANY SUBJECT MATTER OF
             THIS AGREEMENT UNDER ANY CONTRACT, NEGLIGENCE, STRICT LIABILITY OR
             OTHER LEGAL OR EQUITABLE THEORY FOR (i) ANY SPECIAL, INDIRECT,
             INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES OR LOST PROFITS OR
             (ii) COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR
             SERVICES.

Article 12.  INDEMNIFICATION

12.1 Indemnification.
     ----------------

     Neither Party shall indemnify the other Party nor its Affiliates, or
     respective officers, directors, employees and agents and its respective
     successors, heirs and assigns ("Indemnitees") except for Sections 9.2 and
     9.3, its respective gross negligence, or failure to perform using its
     reasonable best efforts under the [*****] Plans.  This paragraph does not
     limit either Party's other remedies available to it under the laws.

12.2 Procedure.
     ---------

     A Party that intends to claim indemnification under this Article 12 (the
     "Indemnitee") shall promptly notify the other Party (the "Indemnitor") in
     writing of any loss, claim, damage, liability or action in respect of which
     the Indemnitee or any of its Affiliates or their directors, officers,
     employees, agents, consultants or counsel intend to claim such
     indemnification, and the Indemnitor shall have the right to participate in,
     and, to the extent the Indemnitor so desires, to assume the defense thereof
     with counsel of its own choice.

     The indemnity agreement in this Article 12 shall not apply to amounts paid
     in settlement of any loss, claim, damage, liability or action if such
     settlement is made without the consent of the Indemnitor, which consent
     shall not be withheld unreasonably.  The failure to deliver written notice
     to the Indemnitor within a reasonable time after the commencement of any
     such action, if prejudicial to its ability

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<PAGE>

     to defend such action, shall relieve such Indemnitor of any liability to
     the Indemnitee under this Article 12.

     At the Indemnitor's request, the Indemnitee under this Article 12, and its
     employees and agents, shall cooperate fully with the Indemnitor and its
     legal representatives in the investigation and defense of any action, claim
     or liability covered by this indemnification and provide full information
     with respect thereto.

Article 13.  DISPUTE RESOLUTION

13.1 Informal Dispute Resolution.
     ---------------------------

     13.1.1  Senior Officials.
             ----------------

             The Parties recognize that a bona fide dispute as to certain
             matters may from time to time arise during the Agreement Term,
             which relates to either Party's rights or obligations hereunder. In
             the event of the occurrence of such a dispute, either Party may, by
             written notice to the other Party, have such dispute referred to
             the [*****] of DIVERSA and the [*****] of DOW, or their successors
             or counterparts, for resolution by good faith negotiations within
             [*****] days after such notice is received at a [*****].

     13.1.2  Interim Conduct.
             ---------------

             If the Parties are unable to reach agreement with respect to a
             [*****] Plan pursuant to Section 13.1.1, then such dispute shall be
             resolved as described in Section 13.2 below.

13.2 Arbitration.
     -----------

     Any dispute under this Agreement, except one that arises with respect to
     determination of Research [*****] or Research [*****], which is not settled
     by mutual consent pursuant to Section 13.1, shall be finally settled by
     binding arbitration, conducted in accordance with the Commercial
     Arbitration Rules of the American Arbitration Association (or such rules as
     are appropriate to the dispute) by three independent, neutral arbitrators
     having at least 15 years of experience in the areas of the contested issues
     and appointed in accordance with said rules. The procedures or rules for
     the arbitration may be modified by mutual consent of the Parties, including
     having mediation rather than an arbitration conducted. Any arbitration
     shall be in English held in [*****]. The arbitrators shall determine what
     discovery shall be permitted, consistent with the goal of limiting the cost
     and time that the Parties must expend for discovery; provided, however,
     that the arbitrators shall permit such discovery, as they deem necessary to
     permit an equitable resolution of the dispute. Any written evidence
     originally in a language other than English shall be submitted in English
     translation accompanied by the original or a true copy thereof. Except as
     otherwise expressly

                                      34      * Confidential Treatment Requested
<PAGE>

     provided in this Agreement, the costs of the arbitration, including
     administrative and arbitrator fees, shall be [*****] by the Parties and
     each Party shall bear its own costs and attorneys' and witness' fees
     incurred in connection with the arbitration.

     A disputed performance or suspended performance(s) pending the resolution
     of the arbitration must be completed within a reasonable time period
     following the final decision of the arbitrators.

     Any arbitration subject to this Article 13 shall be completed within
     [*****] from the filing of notice of a request for such arbitration and a
     written decision with reasons therefore provided to the Parties. Any
     decision shall be deemed confidential and not disclosed to any Third Party.
     Should a Party believe that reporting the decision is required by
     governmental regulation, then the Parties shall mutually agree as to the
     content of such report.

     Any decision which requires a monetary payment shall require such payment
     to be payable in United States dollars, free of any tax or other deduction.

     The Parties agree that the decision shall be the sole, exclusive and
     binding remedy between them regarding any and all disputes, controversies,
     claims and counterclaims presented to the arbitrators.  If a decision is
     not complied with by a Party, then any award or decision may be entered in
     a court of competent jurisdiction for a judicial recognition of the
     decision and an order of enforcement.

Article 14.  MISCELLANEOUS

14.1 Notices.
     -------

     All notices (including, but not limited to, legal matters and copies of the
     signed RMC minutes) shall be in writing mailed via certified mail, return
     receipt requested, or overnight express mail, courier providing evidence of
     delivery, addressed as follows, or to such other address as may be
     designated by notice so given from time to time:

                 If to DOW:               THE DOW CHEMICAL COMPANY
                                          [*****]


                 If to DIVERSA:           DIVERSA CORPORATION
                                          10665 Sorrento Valley Road
                                          San Diego, California   92121
                                          Attention:  Chief Executive Officer
     Notices shall be deemed given as of the date received.

     If the notice relates to scientific matters, such as the RMC, a [*****]
     Plan, a Research [*****], or a Research [*****], the notice for the Parties
     is to be supplied and received in the manner described above but sent to:

                                      35      * Confidential Treatment Requested
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                 If to DOW:               THE DOW CHEMICAL COMPANY
                                          [*****]


                 If to DIVERSA:           DIVERSA CORPORATION.
                                          10665 Sorrento Valley Road
                                          San Diego, California 92121
                                          Attention:  Jay M. Short, Ph.D.

                                      36      * Confidential Treatment Requested
<PAGE>

14.2 Governing Law and Jurisdiction.
     -------------------------------

     This Agreement shall be governed by and construed in accordance with the
     laws of the State of Delaware, without regard to the application of
     principles of conflicts of law.

14.3 Binding Effect.
     --------------

     This Agreement shall be binding upon and inure to the benefit of the
     Parties and their respective legal representatives, successors and
     permitted assigns.

14.4 Headings.
     --------

     Section and subsection headings are inserted for convenience of reference
     only and do not form a part of this Agreement.

14.5 Counterparts.
     ------------

     This Agreement may be executed simultaneously in two or more counterparts,
     each of which shall be deemed an original.

14.6 Amendment; Waiver.
     -----------------

     This Agreement may be amended, modified, superseded or canceled, and any of
     the terms may be waived, only by a written instrument executed by each
     Party or, in the case of waiver, by the Party or Parties waiving
     compliance. Nevertheless, Appendices [*****] may be amended by the
     signatures of the co-chairs of the RMC to a revised Appendix, which must
     then be supplied to the persons for notice under Section 14.1, and
     Appendices [*****] may be amended by the signatures of both Patent
     Coordinators listed in Section 7.3. The delay or failure of any Party at
     any time or times to require performance of any provisions shall in no
     manner affect the rights at a later time to enforce the same. No waiver by
     any Party of any condition or of the breach of any term contained in this
     Agreement, whether by conduct, or otherwise, in any one or more instances,
     shall be deemed to be, or considered as, a further or continuing waiver of
     any such condition or of the breach of such term or any other term of this
     Agreement.

14.7 No Agency or Partnership.
     ------------------------

     Nothing contained in this Agreement shall give either Party the right to
     bind the other Party, or be deemed to constitute either Party as an agent
     for the other Party or as a partner with the other Party or any Third
     Party.

14.8 Assignment and Successors.
     -------------------------

     Except as expressly provided herein, this Agreement may not be assigned by
     either Party without the prior written consent of the other Party, except
     that each Party may, without such consent, assign this Agreement and the
     rights, obligations and interests of such Party, in whole or in part, to
     any

                                      37      * Confidential Treatment Requested
<PAGE>

       purchaser or other transferee of all or substantially all of its assets
       in the line of business to which this Agreement pertains, or to any
       successor corporation resulting from any merger or consolidation of such
       Party with or into another entity, subject, however, in the case of
       DIVERSA to the restriction set forth in Section 3.3.2. In the event of
       any merger or consolidation by a Party into another entity, such Party
       shall promptly notify the other Party in writing of such merger or
       consolidation and the obligations under this Agreement shall be
       maintained and performed by the successor entity unless modified in
       accord with Section 14.6.

14.9   Force Majeure.
       -------------

       Neither DOW nor DIVERSA shall be liable to the other Party for failure of
       or delay in performing obligations set forth in this Agreement, and
       neither shall be deemed in breach of its obligations, if such failure or
       delay is due to natural disasters or any other cause beyond the
       reasonable control of a Party, and notice of such prevention of
       performance is promptly provided by the non-performing Party to the other
       Party. Such excuse shall be continued so long as the condition
       constituting force majeure continues and the non-performing Party takes
       reasonable efforts to remove the condition. In event of such force
       majeure, the Party affected thereby shall use reasonable efforts to cure
       or overcome the same and resume performance of its obligations hereunder.

14.10  Interpretation.
       --------------

       The Parties hereto acknowledge and agree that: (i) each Party and its
       counsel reviewed and negotiated the terms and provisions of this
       Agreement and have contributed to its revision; (ii) the rule of
       construction to the effect that any ambiguities are resolved against the
       drafting Party shall not be employed in the interpretation of this
       Agreement; and (iii) the terms and provisions of this Agreement shall be
       construed fairly as to all Parties hereto and not in a favor of or
       against any Party, regardless of which Party was generally responsible
       for the preparation of this Agreement.

14.11  Integration: Severability.
       -------------------------

       This Agreement (including the Exhibits attached hereto) together with the
       License Agreement sets forth all of the agreements and understandings
       between the Parties with respect to the subject matter hereof and
       supersedes all other agreements and understandings between the Parties
       with respect to the same.

       If any provision of this Agreement is or becomes invalid or is ruled
       invalid by any court of competent jurisdiction or is deemed
       unenforceable, it is the intention of the Parties that the remainder of
       this Agreement shall not be affected. If possible, the invalid provision
       shall be replaced with a valid provision, which meets the intent of the
       Parties.

14.12  Approvals.
       ---------

       DOW shall be responsible, at its expense, for obtaining any approvals
       from governmental entities which may be required under applicable law for
       the development of Research [*****] or Licensed [*****], and shall use
       its best efforts to obtain all necessary

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<PAGE>

       approvals as soon as reasonable. DIVERSA shall be responsible, at its
       expense, for obtaining any approvals from governmental entities which may
       be required under applicable law for the shipment of [*****] Enzymes to
       DOW to perform its obligations under the R&D Program.

14.13  Export Controls.
       ---------------

       This Agreement is made subject to any restrictions concerning the export
       of Licensed [*****], Research [*****], Research [*****] or Intellectual
       Property (collectively, "Technology") from the United States that may be
       imposed upon either Party from time to time by laws or regulations of the
       United States. Neither Party will export, directly or indirectly, any
       Technology to any country for which the United States government or any
       agency thereof at the time of export requires an export license or other
       governmental approval, without first obtaining the written consent to do
       so from the Department of Commerce, Bureau of Export Administration, or
       other agency of the United States government when required by applicable
       statute or regulation.

       IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed
in duplicate as of the last signature date below, by their duly authorized
representatives. This Agreement is intended to be signed concurrently with the
License Agreement and shall not be effective until the License Agreement has
also been executed by both Parties.


                                         THE DOW CHEMICAL COMPANY


Date:______________________________      By:_________________________________
                                                Fernand Kaufmann
                                                Vice President
                                                New Businesses and Strategic
                                                Development

                                         DIVERSA CORPORATION


Date:_______________________________     By:_________________________________
                                                Jay M. Short, Ph.D.
                                                Chief Executive Officer

13 Appendix Enc.:
Appendix A-1:     [*****]
Appendix A-2:     [*****]
Appendix A-3:     [*****]
Appendix B-1:     [*****]
Appendix B-2:     [*****]
Appendix B-3:     [*****]
                  [*****]

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<PAGE>

Appendix B-4:  [*****]

Appendix C:    [*****]
Appendix D:    [*****]
Appendix E:    [*****]
Appendix F:    [*****]
Appendix G:    [*****]
Appendix H:    [*****]

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<PAGE>

                               APPENDIX [*****]

               RESEARCH [*****] AND/OR RESEARCH [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                                 [*****] PLANS

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                                RMC MEMBERSHIP

                                              * Confidential Treatment Requested

<PAGE>

                                 APPENDIX A-3

                                RMC MEMBERSHIP

The following employees of DIVERSA will represent DIVERSA as the company's
initial RMC members:

[*****]

[*****]

[*****]


The following employees of DOW will represent DOW as the company's initial RMC
members:

[*****]

[*****]

[*****]

[*****]
                                              * Confidential Treatment Requested
<PAGE>

                               APPENDIX [*****]

        PATENT RIGHTS DURING THE AGREEMENT TERM UNDER THE [*****] PLANS

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                      DIVERSA PATENT RIGHTS WHICH [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

      PATENT RIGHTS DIRECTED TO [*****] RESEARCH [*****] AND/OR RESEARCH
                                    [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

        SPECIFIC [*****] DIVERSA PATENT RIGHTS USED TO [*****] ENZYMES

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                                    [*****]



<TABLE>
<CAPTION>
                  Title/Subject                       Filing Date            Serial No.
- ------------------------------------------------------------------------------------------
<S>                                                   <C>                    <C>
[*****]

</TABLE>

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                                    [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                                    [*****]

[*****].

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                               LICENSE AGREEMENT

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                            [*****] PLAN PROCEDURES

                                              * Confidential Treatment Requested

<PAGE>

                                  APPENDIX E

                                    [*****]

[*****]

I.   [*****]

[*****]

  1. [*****];

  2. [*****]; and

  3. [*****].

II.  [*****]

[*****]:

  1. [*****];

  2. [*****];

  3. [*****];

  4. [*****]; and

  5. [*****].

III. [*****]

[*****]:

  1. [*****]; and

  2. [*****].

IV.  [*****]

                                              * Confidential Treatment Requested

<PAGE>

[*****].

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                          MATERIAL TRANSFER AGREEMENT

                                              * Confidential Treatment Requested

<PAGE>

                                   APPENDIX F

                          MATERIAL TRANSFER AGREEMENT


Effective as of                 , (the "Effective Date") this Agreement ("MTA")
is made and entered into by and between Diversa Corporation, a Delaware
corporation with headquarters at 10665 Sorrento Valley Road, San Diego, CA 92121
(hereinafter "DIVERSA") and The Dow Chemical Company, a Delaware corporation
with headquarters at 2030 Dow Center, Midland, Michigan 48674 (hereinafter
"DOW"), collectively known as "The Parties".

WHEREAS, DIVERSA will provide DOW with certain proprietary genes as set forth
below and hereinafter referred to as "Material" pursuant to the terms and
conditions of this Agreement; and

     WHEREAS, DOW desires to use the Material for purposes of research to be
conducted under the Collaborative Research Agreement between the Parties dated
July 22, 1999 (the "Agreement") and is willing to receive the Material pursuant
to the terms and conditions of this MTA.

NOW THEREFORE, in consideration of the mutual promises and covenants herein
contained, the Parties mutually agree to the following terms:

1.  DIVERSA will provide to DOW the following Material: [TO BE DETERMINED]

2.  DOW agrees that the Material shall be used solely for the purpose research
    under the Agreement and shall not be used for any other purpose whatsoever.

3.  The Material delivered hereby is experimental in nature. DIVERSA MAKES NO
    WARRANTIES, EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR
    FITNESS FOR A PARTICULAR PURPOSE.

4.  Information transferred under this MTA, including but not limited to the
    Material and all information related to the Material, shall be "Confidential
    Information". DOW shall not disclose to third parties any Confidential
    Information received from DIVERSA hereunder, provided, however, that DOW
    shall have no obligations to DIVERSA with respect to the use, or disclosure
    to others not party to this Agreement of such information which;

    a)  prior to disclosure was known to or in the possession of DOW as
        evidenced by its written records; or
    b)  is or becomes publicly known during the term of this MTA, other than
        through a breach of DOW's obligations hereunder; or
    c)  is received from a third party having no obligations of confidentiality
        to DIVERSA hereunder; or






                                              * Confidential Treatment Requested

<PAGE>

      d)    is developed by DOW independently of any disclosures made under this
MTA as evidenced by its written records; or
      e)    is required by law or bona fide legal process to be disclosed
provided that DOW takes all reasonable notice to DIVERSA or
      f)    is authorized to be released in written release by DIVERSA.

5.  DOW shall not modify the Materials in any way reverse engineer the Material
use the Materials for reproduction, offer the Materials or any derivative
thereof for resale, or use the Materials in any form of human or animal testing
except as provided in the Agreement.

6.  DOW agrees that the Material method of using the Material or any other
material that could not have been made but for the Material, shall not be sold
or otherwise transferred to any third party except as provided in the Agreement.

7.  In the event that DOW provides DIVERSA with DOW's Material all the
provisions above shall be construed to bind DIVERSA in the place of DOW in an
identical manner.  DIVERSA acknowledges that it has received Material from DOW
under another research agreement for use as a dehalogenase enzyme, which
Material may be used under this MTA for the present Agreement.

8.  This MTA and rights thereunder shall not be assigned or transferred directly
or indirectly in whole or in part by the Parties except as provided in the
Agreement.

9.  This MTA shall become effective beginning on the Effective Date and through
the term of the Agreement.

10.  This MTA may be terminated as set forth in the Agreement.

11.  The Parties represent and warrant that each has the authority to undertake
the obligations set forth in the MTA without breaching or violating any
contractual or statutory obligation owed to another.

12.  The provisions of this MTA are severable and in the event any provisions
of this MTA are determined to be held invalid or unenforceable under any
controlling body of law such invalidity or unenforceability shall not in any way
affect the validity and enforceability of the remaining provisions hereof.

13.  This MTA shall be construed in accordance with the laws of the State of
Delaware without regard to its conflict of laws principles.

After receipt of the executed Agreement, DIVERSA will arrange to provide DOW
with the materials.

IN WITNESS WHEREOF, the Parties have, through duly authorized representatives,
executed this MTA, effective as of the date forth above.

                                              * Confidential Treatment Requested

<PAGE>

THE DOW CHEMICAL COMPANY                DIVERSA CORPORATION


_________________________________       _________________________________



Name:____________________________       Name:____________________________


Title:___________________________       Title:___________________________

Date:____________________________       Date:____________________________
<PAGE>

                               APPENDIX [*****]

                               LICENSED [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                               RESEARCH [*****]

                                              * Confidential Treatment Requested

<PAGE>

                               APPENDIX [*****]

                               RESEARCH [*****]

                                              * Confidential Treatment Requested


<PAGE>

                                                                    EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

   We consent to the reference to our firm under the captions "Selected
Financial Information" and "Experts" and to the use of our report dated January
12, 2000, except for Note 11, as to which the date is February 8, 2000, in
Amendment No. 5 to the Registration Statement (Form S-1, Registration No. 333-
92853) and related Prospectus of Diversa Corporation for the registration of
shares of its common stock.

                                          /s/ ERNST & YOUNG LLP

San Diego, California

February 10, 2000

<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1999
<PERIOD-START>                             JAN-01-1998             JAN-01-1999
<PERIOD-END>                               DEC-31-1998             DEC-31-1999
<CASH>                                           4,473                   2,490
<SECURITIES>                                     1,079                   2,594
<RECEIVABLES>                                       54                  15,572
<ALLOWANCES>                                       (6)                     (1)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                 6,010                  21,314
<PP&E>                                           2,622                   3,096
<DEPRECIATION>                                   1,178                   1,498
<TOTAL-ASSETS>                                   8,706                  31,072
<CURRENT-LIABILITIES>                            3,540                   7,412
<BONDS>                                              0                       0
                                0                       0
                                     48,402                  48,408
<COMMON>                                             6                       6
<OTHER-SE>                                    (45,732)                  42,807
<TOTAL-LIABILITY-AND-EQUITY>                     8,706                  31,072
<SALES>                                              0                       0
<TOTAL-REVENUES>                                 1,347                  10,272
<CGS>                                                0                       0
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                15,201                  19,506
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 308                     391
<INCOME-PRETAX>                               (13,510)                 (9,085)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                  (13,510)                 (9,085)
<EPS-BASIC>                                     (7.64)                  (3.86)
<EPS-DILUTED>                                        0                  (0.36)


</TABLE>


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