Document:

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                                                                     Exhibit 4.8

THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A
VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE
OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT
RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.
--------------------------------------------------------------------------------

Warrant No. WA-1                                      Number of Shares:  ((##))
Date of Issuance: ((Date))                            (subject to adjustment)

                                 Deltagen, Inc.

                    Series A Preferred Stock Purchase Warrant

     Deltagen, Inc., a Delaware corporation (the "Company"), for value received,
hereby certifies that Woodside Technology Center, LLC, a Delaware limited
liability company, or its assigns (the "Registered Holder"), is entitled,
subject to the terms set forth below, to purchase from the Company, at any time
after the date hereof and on or before the Expiration Date (as defined in
Section 7 below), up to ((to be determined per Option Agreement)) shares of
[Series A Preferred Stock] OR [Common Stock] of the Company ("Preferred Stock"),
at a purchase price of $((ExercisePrice)) per share. The shares purchasable upon
exercise of this Warrant and the purchase price per share, as adjusted from time
to time pursuant to the provisions of this Warrant, are hereinafter referred to
as the "Warrant Stock" and the "Purchase Price," respectively.

     1. Exercise.

        (a) Manner of Exercise. This Warrant may be exercised by the Registered
Holder, in whole or in part, by surrendering this Warrant, with the
purchase/exercise form appended hereto as Exhibit A duly executed by such
Registered Holder or by such Registered Holder's duly authorized attorney, at
the principal office of the Company, or at such other office or agency as the
Company may designate, accompanied by payment in full of the Purchase Price
payable in respect of the number of shares of Warrant Stock purchased upon such
exercise. The Purchase Price may be paid by cash, check, wire transfer or by the
surrender of promissory notes or other instruments representing indebtedness of
the Company to the Registered Holder. Notwithstanding anything to the contrary
contained herein, unless the Registered Holder otherwise notifies the Company,
this Warrant shall be deemed to be automatically exercised using the Net Issue
Exercise provisions pursuant to Section 1(c) hereof immediately prior to the
Expiration Date at which this Warrant ceases to be exercisable (provided the per
share Purchase Price exceeds the then per share fair market value of the Warrant
Stock).

        (b) Effective Time of Exercise. Each exercise of this Warrant shall be
deemed to have been effected immediately prior to the close of business on the
day on which this Warrant shall have been surrendered to the Company as provided
in Section 1(a) above. At such time, the person or persons in whose name or
names any certificates for Warrant Stock shall be

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issuable upon such exercise as provided in Section 1(d) below shall be deemed to
have become the holder or holders of record of the Warrant Stock represented by
such certificates.

        (c) Net Issue Exercise.

            (i)  In lieu of exercising this Warrant in the manner provided above
in Section 1(a), the Registered Holder may elect to receive shares equal to the
value of this Warrant (or the portion thereof being canceled) by surrender of
this Warrant at the principal office of the Company together with notice of such
election on the purchase/exercise form appended hereto as Exhibit A duly
executed by such Registered Holder or such Registered Holder's duly authorized
attorney, in which event the Company shall issue to such Registered Holder a
number of shares of Warrant Stock computed using the following formula:

                           X =  Y (A - B)
                                ---------
                                     A

Where   X = The number of shares of Warrant Stock to be issued to the Registered
            Holder.

        Y = The number of shares of Warrant Stock purchasable under this Warrant
            (at the date of such calculation).

        A = The fair market value of one share of Warrant Stock (at the date of
            such calculation).

        B = The Purchase Price (as adjusted to the date of such calculation).

            (ii) For purposes of this Section 1(c), the fair market value of
Warrant Stock on the date of calculation shall mean with respect to each share
of Warrant Stock:

                 (A) if the Company's Common Stock is traded on a securities
exchange or The Nasdaq National Market, SmallCap Market, BBX or actively traded
over the counter:

                     (1) if the Company's Common Stock is traded on a securities
exchange or The Nasdaq National Market, Small Cap Market or BBX, the fair market
value shall be deemed to be the product of (x) the average of the closing prices
over a 30 trading day period ending three days before the date of calculation
and (y) the number of shares of Common Stock into which each share of Warrant
Stock is convertible on such date; or

                     (2) if the Company's Common Stock is actively traded over
the counter, the fair market value shall be deemed to be the product of (x) the
average of the closing bid or sales price (whichever is applicable) over the 30
trading day period ending three days before the date of calculation and (y) the
number of shares of Common Stock into which each share of Warrant Stock is
convertible on such date; or

                                       -2-

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                 (B) if (A) is not applicable, the fair market value of Warrant
Stock shall be at the highest price per share which the Company could obtain on
the date of calculation from a willing buyer (not a current employee or
director) for shares of Warrant Stock sold by the Company, from authorized but
unissued shares, as determined in good faith by the Board of Directors, unless
the Company is at such time subject to an acquisition as described in Section
7(b) below, in which case the fair market value of Warrant Stock shall be deemed
to be the value received by the holders of such stock pursuant to such
acquisition.

        (d) Delivery to Registered Holder. As soon as practicable after the
exercise of this Warrant in whole or in part, and in any event within ten (10)
days thereafter, the Company at its expense will cause to be issued in the name
of, and delivered to, the Registered Holder, or as such Registered Holder (upon
payment by such Registered Holder of any applicable transfer taxes) may direct:

            (i)  a certificate or certificates for the number of shares of
Warrant Stock to which such Registered Holder shall be entitled, and

            (ii) in case such exercise is in part only, a new warrant or
warrants (dated the date hereof) of like tenor, calling in the aggregate on the
face or faces thereof for the number of shares of Warrant Stock equal (without
giving effect to any adjustment therein) to the number of such shares called for
on the face of this Warrant minus the number of such shares purchased by the
Registered Holder upon such exercise as provided in Section 1(a) or 1(c) above.

     2. Adjustments.

        (a) Redemption or Conversion of Preferred Stock. If all of the Preferred
Stock is redeemed or converted into shares of Common Stock, then this Warrant
shall automatically become exercisable for that number of shares of Common Stock
equal to the number of shares of Common Stock that would have been received if
this Warrant had been exercised in full and the shares of Preferred Stock
received thereupon had been simultaneously converted into shares of Common Stock
immediately prior to such event, and the Exercise Price shall be automatically
adjusted to equal the number obtained by dividing (i) the aggregate Purchase
Price of the shares of Preferred Stock for which this Warrant was exercisable
immediately prior to such redemption or conversion, by (ii) the number of shares
of Common Stock for which this Warrant is exercisable immediately after such
redemption or conversion.

        (b) Stock Splits and Dividends. If outstanding shares of the Company's
Preferred Stock shall be subdivided into a greater number of shares or a
dividend in Preferred Stock shall be paid in respect of Preferred Stock, the
Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such
subdivision or immediately after the record date of such dividend be
proportionately reduced. If outstanding shares of Preferred Stock shall be
combined into a smaller number of shares, the Purchase Price in effect
immediately prior to such combination shall, simultaneously with the
effectiveness of such combination, be proportionately increased. When any
adjustment is required to be made in the Purchase Price, the number of shares of
Warrant Stock purchasable upon the exercise of this Warrant shall be changed to
the number

                                      -3-

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determined by dividing (i) an amount equal to the number of shares issuable upon
the exercise of this Warrant immediately prior to such adjustment, multiplied by
the Purchase Price in effect immediately prior to such adjustment, by (ii) the
Purchase Price in effect immediately after such adjustment.

        (c) Reclassification, Etc. In case there occurs any reclassification or
change of the outstanding securities of the Company or of any reorganization of
the Company (or any other corporation the stock or securities of which are at
the time receivable upon the exercise of this Warrant) or any similar corporate
reorganization on or after the date hereof, then and in each such case the
Registered Holder, upon the exercise hereof at any time after the consummation
of such reclassification, change, or reorganization shall be entitled to
receive, in lieu of the stock or other securities and property receivable upon
the exercise hereof prior to such consummation, the stock or other securities or
property to which such Registered Holder would have been entitled upon such
consummation if such Registered Holder had exercised this Warrant immediately
prior thereto, all subject to further adjustment pursuant to the provisions of
this Section 2.

        (d) Mergers or Consolidations. If at any time after the date hereof
there shall be a capital reorganization (other than a combination or subdivision
of Warrant Stock otherwise provided for herein) (a "Reorganization"), or a
merger or consolidation of the Company with another corporation (other than a
merger with another corporation in which the Company is the continuing
corporation and which does not result in any reclassification or change of
outstanding securities issuable upon exercise of this Warrant or a merger
effected exclusively for the purpose of changing the domicile of the Company) (a
"Merger"), then, as a part of such Reorganization or Merger, lawful provision
shall be made so that the Registered Holder shall thereafter be entitled to
receive upon exercise of this Warrant, during the period specified in this
Warrant and upon payment of the Purchase Price, that number of shares of stock
or other securities or property of the Company or the successor corporation
resulting from such Reorganization or Merger to which a holder of the Warrant
Stock deliverable upon exercise of this Warrant would have been entitled under
the provisions of the agreement relating such Reorganization or Merger if this
Warrant had been exercised immediately prior to such Reorganization or Merger.
In any such case, appropriate adjustment (as determined in good faith by the
Company's Board of Directors) shall be made in the application of the provisions
of this Warrant with respect to the rights and interests of the Registered
Holder after the Reorganization or Merger to the end that the provisions of this
Warrant (including adjustment of the Purchase Price then in effect and the
number of shares of Warrant Stock) shall be applicable after that event, as near
as reasonably may be, in relation to any shares or other property deliverable
after that event upon exercise of this Warrant.

        (e) Adjustment Certificate. When any adjustment is required to be made
in the Warrant Stock or the Purchase Price pursuant to this Section 2, the
Company shall promptly mail to the Registered Holder a certificate setting forth
(i) a brief statement of the facts requiring such adjustment, (ii) the Purchase
Price after such adjustment and (iii) the kind and amount of stock or other
securities or property into which this Warrant shall be exercisable after such
adjustment.

                                      -4-

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        (f) Acknowledgement. In order to avoid doubt, it is acknowledged that
the holder of this Warrant shall be entitled to the benefit of all adjustments
in the number of shares of Common Stock of the Company issuable upon conversion
of the Preferred Stock of the Company which occur prior to the exercise of this
Warrant, including without limitation, any increase in the number of shares of
Common Stock issuable upon conversion as a result of a dilutive issuance of
capital stock.

     3. Transfers.

        (a) Unregistered Security. Each holder of this Warrant acknowledges that
this Warrant, the Warrant Stock and the Common Stock of the Company have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), and agrees not to sell, pledge, distribute, offer for sale, transfer or
otherwise dispose of this Warrant, any Warrant Stock issued upon its exercise or
any Common Stock issued upon conversion of the Warrant Stock in the absence of
(i) an effective registration statement under the Securities Act as to this
Warrant, such Warrant Stock or such Common Stock and registration or
qualification of this Warrant, such Warrant Stock or such Common Stock under any
applicable U.S. federal or state securities law then in effect, or (ii) an
opinion of counsel, satisfactory to the Company, that such registration and
qualification are not required. Each certificate or other instrument for Warrant
Stock issued upon the exercise of this Warrant shall bear a legend substantially
to the foregoing effect. The Company hereby acknowledges that upon issuance of
this Warrant, the Registered Holder is simultaneously receiving registration
rights related to the Warrant Shares pursuant to the _____________ Agreement
dated __________, 2003 (the "Registration Rights Agreement").

        (b) Transferability. This Warrant is not transferable without the
Company's prior written consent; provided, however, such consent shall not be
required in connection with the transfer by any Registered Holder (or any of its
assigns that acquire rights to the Warrant Shares) (but only with all related
obligations) without consideration to one or more Qualifying Holders (as such
term is defined below), provided that (i) written notice (in the form of Exhibit
B attached hereto) is provided to the Company at any time prior to any such
transfer, (ii) each transferee is an "accredited investor" as defined in Rule
501(a) of Regulation D promulgated under the Securities Act and (iii) each
transferee agrees in writing to be bound by all of the provisions of this
Warrant. For purposes of this Section 3(b), the term "Qualifying Holder" shall
mean, with respect to any Registered Holder, (i) any shareholder, partner,
limited partner or member thereof, (ii) any corporation, partnership or limited
liability company controlling, controlled by, or under common control with, such
Holder or any partner or member thereof, or (iii) any other direct transferee
from such Registered Holder of all of the Warrant Shares held by such Registered
Holder or issuable upon exercise of the Warrant then held by such Registered
Holder.

        (c) Warrant Register. The Company will maintain a register containing
the names and addresses of the Registered Holders of this Warrant. Until any
transfer of this Warrant is made in the warrant register, the Company may treat
the Registered Holder of this Warrant as the absolute owner hereof for all
purposes; provided, however, that if this Warrant is properly assigned in blank,
the Company may (but shall not be required to) treat the bearer hereof as the
absolute owner hereof for all purposes, notwithstanding any notice to the
contrary. Any

                                      -5-

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Registered Holder may change such Registered Holder's address as shown on the
warrant register by written notice to the Company requesting such change.

     4. No Impairment. The Company will not, by amendment of its charter or
through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will (subject to Section 15 below) at
all times in good faith assist in the carrying out of all such terms and in the
taking of all such action as may be necessary or appropriate in order to protect
the rights of the holder of this Warrant against impairment.

     5. Representations and Warranties of the Registered Holder. The Registered
Holder hereby represents and warrants to the Company that:

        (a) Authorization. The Registered Holder has full power and authority to
enter into this Warrant. The Warrant, when executed and delivered by the
Registered Holder, will constitute a valid and legally binding obligation of the
Registered Holder, enforceable in accordance with its terms, except as limited
by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance, and any other laws of general application affecting enforcement of
creditors' rights generally, and as limited by laws relating to the availability
of specific performance, injunctive relief, or other equitable remedies.

        (b) Purchase Entirely for Own Account. This Warrant is issued to the
Registered Holder in reliance upon the Registered Holder's representation to the
Company, which by the Registered Holder's acceptance of this Warrant, the
Registered Holder hereby confirms, that the Warrant to be acquired by the
Registered Holder, the Warrant Stock and the Common Stock to be issued upon the
conversion of the Warrant Stock (collectively, the "Securities") will be
acquired for investment for the Registered Holder's own account, not as a
nominee or agent, and not with a view to the resale or distribution of any part
thereof, and that the Registered Holder has no present intention of selling,
granting any participation in, or otherwise distributing the same. By accepting
this Warrant, the Registered Holder further represents that the Registered
Holder does not presently have any contract, undertaking, agreement or
arrangement with any person to sell, transfer or grant participations to such
person or to any third person, with respect to any of the Securities. The
Registered Holder has not been formed for the specific purpose of acquiring the
Securities.

        (c) Disclosure of Information. The Registered Holder has had an
opportunity to discuss the Company's business, management, financial affairs and
the terms and conditions of the offering of the Securities with the Company's
management and has had an opportunity to review the Company's facilities. The
Registered Holder understands that such discussions, as well as any written
information delivered by the Company to the Registered Holder, were intended to
describe the aspects of the Company's business which it believes to be material.

                                      -6-

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        (d) Restricted Securities. The Registered Holder understands that this
Warrant has not been registered under the Securities Act, by reason of a
specific exemption from the registration provisions of the Securities Act which
depends upon, among other things, the bona fide nature of the investment intent
and the accuracy of the Registered Holder's representations as expressed herein.
The Common Stock underlying the Warrant Shares, however, will be registered by
the Company pursuant to the terms of the Registration Rights Agreement. The
Registered Holder understands that until registered, the Securities are
"restricted securities" under applicable U.S. federal and state securities laws
and that, pursuant to these laws, the Registered Holder must hold the Securities
until they are registered with the Securities and Exchange Commission and
qualified by state authorities, or an exemption from such registration and
qualification requirements is available. The Registered Holder further
acknowledges that if an exemption from registration or qualification is
available, it may be conditioned on various requirements including, but not
limited to, the time and manner of sale, the holding period for the Securities,
and on requirements relating to the Company which are outside of the Registered
Holder's control, and which the Company is under no obligation and may not be
able to satisfy.

        (e) Public Market. The Registered Holder understands that although a
public market now exists for the Company's Common Stock, that the Company has
made no assurances that a public market will continue to exist for the Common
Stock.

        (f) Accredited or Sophisticated Investor. The Registered Holder is an
accredited investor as defined in Rule 501(a) of Regulation D promulgated under
the Securities Act.

     6. Representations and Warranties of the Company. The Company hereby
represents and warrants to the Registered Holder that:

        (a) This Warrant has been duly authorized, executed and delivered by the
Company. All corporate action on the part of the Company and its stockholders,
directors and officers necessary for the authorization, execution and delivery
of this Warrant, the performance of all the Company's obligations hereunder and
for the authorization, issuance or reservation for issuance, sale and delivery
of the Warrant and shares issuable upon exercise of the Warrant (and shares
issuable upon conversion of such shares) has been taken. This Warrant
constitutes the legal, valid and binding obligation of the Company, enforceable
against the Company in accordance with its terms, subject to (i) laws of general
application relating to bankruptcy, insolvency and the relief of debtors, (ii)
rules of law governing specific performance, injunctive relief and other
equitable remedies, and (iii) the limitations imposed by applicable federal or
state securities laws on indemnification provisions.

        (b) The execution, delivery and performance of this Warrant and sale of
the shares issuable upon exercise of the Warrant (and shares issuable upon
conversion of such shares) will not conflict with, or result in a breach or
violation of (i) any of the terms and provisions of the charter, as restated as
contemplated hereby, or bylaws of the Company or any of its subsidiaries, (ii)
any statute, rule, regulation or order of any governmental agency or body, any
court, domestic or foreign, or any self-regulatory organization having
jurisdiction over the

                                      -7-

<PAGE>

Company or any subsidiary of the Company or any of their respective properties,
or (iii) any of the terms and provisions of, or constitute a default (with or
without notice or lapse of time) under, or give to any third party a right of
termination, amendment, acceleration or cancellation (with or without notice or
lapse of time) of, any agreement or instrument to which the Company or any such
subsidiary is a party or by which the Company or any such subsidiary is bound or
to which any of the properties of the Company or any such subsidiary is subject
(except where such breaches, violations or defaults individually or in the
aggregate would not have a material adverse effect on the Company and its
subsidiaries taken as a whole). The Company has full power and authority to
authorize, issue and sell the Warrant and shares issuable upon exercise of the
Warrant as contemplated by this Warrant.

        (c) All registration statements, proxy statements and other statements,
reports, schedules, forms and other documents filed by the Company with the SEC
since August 3, 2000, including copies of all the exhibits referenced therein
(the "SEC Documents") are publicly available for review. All statements,
reports, schedules, forms and other documents required to have been filed by the
Company with the SEC since August 3, 2000 have been so timely filed. As of their
respective dates (or, if amended or superseded by a filing prior to the date of
this Agreement, then on the date of such amendment or superseding filing): (i)
each of the SEC Documents complied in all material respects with the applicable
requirements of the Securities Act or the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), as the case may be, and the rules and regulations
thereunder; and (ii) none of the SEC Documents contained any untrue statement of
a material fact or omitted to state a material fact required to be stated
therein or necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading.

     7. Termination. This Warrant (and the right to purchase securities upon
exercise hereof) shall terminate on the 10th anniversary of the date of issuance
of this Warrant (the "Expiration Date").

     8. Notices of Certain Transactions. In case:

        (a) the Company shall take a record of the holders of its Preferred
Stock (or other stock or securities at the time deliverable upon the exercise of
this Warrant) for the purpose of entitling or enabling them to receive any
dividend or other distribution, or to receive any right to subscribe for or
purchase any shares of stock of any class or any other securities, or to receive
any other right, or

        (b) of any capital reorganization of the Company, any reclassification
of the capital stock of the Company, any consolidation or merger of the Company
with or into another corporation (other than a consolidation or merger in which
the Company is the surviving entity), or any transfer of all or substantially
all of the assets of the Company, or

        (c) of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company, or

                                      -8-

<PAGE>

         (d) of any redemption of the Preferred Stock or mandatory conversion of
the Preferred Stock into Common Stock of the Company,

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder of this Warrant a notice specifying, as the case may be, (i)
the date on which a record is to be taken for the purpose of such dividend,
distribution or right, and stating the amount and character of such dividend,
distribution or right, or (ii) the effective date on which such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation,
winding-up, redemption or conversion is to take place, and the time, if any is
to be fixed, as of which the holders of record of Preferred Stock (or such other
stock or securities at the time deliverable upon such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation,
winding-up, redemption or conversion) are to be determined. Such notice shall be
mailed at least ten (10) days prior to the record date or effective date for the
event specified in such notice.

     9.  Reservation of Stock. The Company will at all times reserve and keep
available, solely for the issuance and delivery upon the exercise of this
Warrant, such shares of Warrant Stock and other stock, securities and property,
as from time to time shall be issuable upon the exercise of this Warrant and
conversion of the Warrant Stock.

     10. Exchange of Warrants. Upon the surrender by the Registered Holder of
any Warrant or Warrants, properly endorsed, to the Company at the principal
office of the Company, the Company will, subject to the provisions of Section 3
hereof, issue and deliver to or upon the order of such Registered Holder, at the
Company's expense, a new Warrant or Warrants of like tenor, in the name of such
Registered Holder or as such Registered Holder (upon payment by such Registered
Holder of any applicable transfer taxes) may direct, calling in the aggregate on
the face or faces thereof for the number of shares of Preferred Stock called for
on the face or faces of the Warrant or Warrants so surrendered.

     11. Replacement of Warrants. Upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and (in the case of loss, theft or destruction) upon delivery of an
indemnity agreement (with surety if reasonably required) in an amount reasonably
satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.

     12. No Rights as Stockholder. Until the exercise of this Warrant, the
Registered Holder of this Warrant shall not have or exercise any rights by
virtue hereof as a stockholder of the Company.

     13. No Fractional Shares. No fractional shares of Preferred Stock will be
issued in connection with any exercise hereunder. In lieu of any fractional
shares which would otherwise be issuable, the Company shall pay cash equal to
the product of such fraction multiplied by the fair market value of one share of
Preferred Stock on the date of exercise, as determined in good faith by the
Company's Board of Directors.

                                      -9-

<PAGE>

     14. Amendment or Waiver. Any term of this Warrant may be amended or waived
only by an instrument in writing signed by the party against which enforcement
of the amendment or waiver is sought.

     15. Headings. The headings in this Warrant are for purposes of reference
only and shall not limit or otherwise affect the meaning of any provision of
this Warrant.

     16. Governing Law. This Warrant shall be governed, construed and
interpreted in accordance with the laws of the State of California, without
giving effect to principles of conflicts of law.

     17. Survival of Representations. Unless otherwise set forth in this
Warrant, the warranties, representations and covenants of the Company and the
Registered Holder contained in or made pursuant to this Warrant shall survive
the execution and delivery of this Warrant.

     18. Transfer; Successors and Assigns. The terms and conditions of this
Warrant shall inure to the benefit of and be binding upon the respective
successors and assigns of the parties. Nothing in this Warrant, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Warrant, except as expressly provided in
this Warrant.

     19. Counterparts. This Warrant may be executed in two or more counterparts,
each of which shall be deemed an original and all of which together shall
constitute one instrument.

     20. Attorney's Fees. If any action at law or in equity (including
arbitration) is necessary to enforce or interpret the terms of any of this
Warrant, the prevailing party shall be entitled to reasonable attorney's fees,
costs and necessary disbursements in addition to any other relief to which such
party may be entitled.

     21. Severability. If one or more provisions of this Warrant are held to be
unenforceable under applicable law, the parties agree to renegotiate such
provision in good faith. In the event that the parties cannot reach a mutually
agreeable and enforceable replacement for such provision, then (a) such
provision shall be excluded from this Warrant, (b) the balance of this Warrant
shall be interpreted as if such provision were so excluded and (c) the balance
of this Warrant shall be enforceable in accordance with its terms.

     22. Delays or Omissions. No delay or omission to exercise any right, power
or remedy accruing to any party under this Warrant, upon any breach or default
of any other party under this Warrant, shall impair any such right, power or
remedy of such non-breaching or non-defaulting party nor shall it be construed
to be a waiver of any such breach or default, or an acquiescence therein, or of
or in any similar breach or default thereafter occurring; nor shall any waiver
of any single breach or default be deemed a waiver of any other breach or
default theretofore or thereafter occurring. Any waiver, permit, consent or
approval of any kind or character on the part of any party of any breach or
default under this Warrant, or any waiver on the part of any party of any
provisions or conditions of this Warrant, must be in writing and shall

                                      -10-

<PAGE>

be effective only to the extent specifically set forth in such writing. All
remedies, either under this Warrant or by law or otherwise afforded to any
party, shall be cumulative and not alternative.

     23. Notices. Any notice required or permitted by this Warrant shall be in
writing and shall be deemed sufficient upon delivery, when delivered personally
or by overnight courier or sent by fax, or 48 hours after being deposited in the
U.S. mail, as certified or registered mail, with postage prepaid, addressed to
the party to be notified at such party's address as set forth on the signature
page, or as subsequently modified by written notice.

     24. Entire Agreement. This Warrant, and the documents referred to herein
constitute the entire agreement between the parties hereto pertaining to the
subject matter hereof, and any and all other written or oral agreements relating
to the subject matter hereof existing between the parties hereto are expressly
canceled.

     25. Further Assurances. Each party agrees (a) to furnish upon request to
each other party such further information, (b) to execute and deliver to each
other party such other documents, and (c) to do such other acts and things, all
as another party may reasonably request for the purpose of carrying out the
intent of this Warrant and the Registration Rights Agreement and the
transactions contemplated hereby and thereby.

                                          DELTAGEN, INC.

                                          By:___________________________________
                                          Name:
                                          Title:

Accepted and Agreed:

REGISTERED HOLDER:

         WOODSIDE TECHNOLOGY CENTER, LLC,
         a Delaware limited liability company

         By:  National Office Partners Limited Partnership,
              a Delaware limited partnership,
              its sole member

              By: Hines National Office Partners Limited Partnership,
                  a Texas limited partnership,
                  its general partner

                  By: Hines Fund Management, L.L.C.,
                      a Delaware limited liability company,
                      its general partner

                                      -11-

<PAGE>

                               By: Hines Interests Limited Partnership,
                                   a Delaware limited partnership,
                                   its sole member

                                   By: Hines Holdings, Inc.,
                                       a Texas corporation,
                                       its general partner

By:    ________________________
Name:  ________________________
Title: ________________________

                                      -12-

<PAGE>

                                    EXHIBIT A

                             PURCHASE/EXERCISE FORM

To:  Deltagen, Inc.                            Dated:

     The undersigned, pursuant to the provisions set forth in the attached
Warrant No. WA-1, hereby irrevocably elects to (a) purchase _______ shares of
the Preferred Stock covered by such Warrant and herewith makes payment of
$_________, representing the full purchase price for such shares at the price
per share provided for in such Warrant, or (b) exercise such Warrant for _______
shares purchasable under the Warrant pursuant to the Net Issue Exercise
provisions of Section 1(c) of the Warrant.

     The undersigned acknowledges that it has reviewed the representations and
warranties contained in Section 5 of the Warrant and by its signature below
hereby makes such representations and warranties to the Company as of the date
hereof.

                                  Signature: ___________________________________

                                  Name (print): ________________________________

                                  Title (if applic.): __________________________

                                  Company (if applic.): ________________________

<PAGE>

                                    EXHIBIT B

                                 ASSIGNMENT FORM

     FOR VALUE RECEIVED, _________________________________________ hereby sells,
assigns and transfers all of the rights of the undersigned under the attached
Warrant with respect to the number of shares of Series A Preferred Stock covered
thereby set forth below, unto:

     Name of Assignee               Address/Fax Number            No. of Shares
     ----------------               ------------------            -------------

Dated:________________                     Signature:___________________________

                                                     ___________________________

                                           Witness:  ___________________________<PAGE>

                                                                 Exhibit 10.25.1
                           LEASE TERMINATION AGREEMENT

          This LEASE TERMINATION AGREEMENT ("Agreement") is dated for reference
purposes only March 27, 2003 and is to be effective as of the date of the last
signature appearing hereon (the "Effective Date"), and is entered into by and
among WILLOW PARK HOLDING COMPANY II, LLC, a Delaware limited liability company
("Willow Park"), AMB PROPERTY, L.P., a Delaware limited partnership ("AMB", and
together with Willow Park, the "Landlords") and DELTAGEN, INC., a Delaware
corporation ("Tenant").

          WHEREAS, Willow Park and Tenant entered into that certain Lease
Agreement dated April 9, 1999 (the "1003 Lease") whereby Willow Park leased to
Tenant approximately 28,938 rentable square feet (the "1003 Premises") located
at 1003 Hamilton Court, Menlo Park, California (the "1003 Building");

          WHEREAS, AMB and Tenant entered into that certain Lease Agreement (the
"1255 Lease") dated October 1, 2000 whereby AMB leased to Tenant approximately
22,237 rentable square feet (the "1255 Premises") located at 1255 Hamilton
Court, Menlo Park, California (the "1255 Building");

          WHEREAS, AMB and Tenant entered into that certain Lease Agreement (the
"1210 Lease") dated October 1, 2000 whereby AMB leased to Tenant approximately
24,636 square feet of rentable area (the "1210 Premises") located at 1210
Hamilton Court, Menlo Park, California (the "Building");

          WHEREAS, the 1003 Lease, the 1210 Lease and the 1255 Lease are
referred to collectively herein as the "Leases";

          WHEREAS, the 1003 Premises, the 1210 Premises and the 1255 Premises
are referred to collectively herein as the "Premises";

          WHEREAS, AMB and Willow Park are affiliates; and

          WHEREAS, Landlords and Tenant mutually desire to terminate the Leases,
all on and subject to the terms and conditions hereof.

          NOW, THEREFORE, for and in consideration of the mutual covenants and
promises herein contained, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

          1.   Definitions.

               (a) "Insolvency Proceeding" shall mean a proceeding under Title
11 of the United States Code, an assignment for the benefit of creditors, a
receivership or any other similar proceeding.

                                       1

<PAGE>

               (b) "Interim Financing" shall mean Tenant's consummation of an
interim equity or debt financing in an amount not less than $4,000,000 which
financing must occur on or before March 31, 2003.

               (c) "Other Settlement Agreement" shall mean any agreement between
Tenant and any landlord, or other creditor of Tenant, (aside from the Landlords
hereunder) whereby Tenant is restructuring or terminating, in any way, any of
Tenant's obligations, including, without limitation, lease termination
agreements, lease amendments, debt refinancing agreements, etc.

               (d) "Preference Expiration Date" shall be the date which is
ninety-one (91) calendar days after the date on which the Termination Payment is
paid (the "Payment Date") by Tenant to the Landlords if during the ninety (90)
calendar day period after the Payment Date Tenant has not become the subject of
an Insolvency Proceeding ("Preference Expiration Date"). In the event that an
Insolvency Proceeding is commenced but thereafter dismissed, the Preference
Expiration Date shall occur if and when the dismissal order becomes final,
provided that nothing in the Insolvency Proceeding or the dismissal order has
affected, altered or modified this Agreement and provided Tenant has not become
the subject of a further Insolvency Proceeding during such ninety (90) calendar
day period after the Payment Date.

               (e) "Premises Existing Condition" shall mean the "as-is"
condition of the Premises as of March 19, 2003.

               (f) "Termination Fee" shall mean, collectively, all letter of
credit proceeds as referred to in Section 3, below, and the Termination Payment
defined below.

               (g) "Termination Payment" shall mean Five Hundred Thousand
Dollars ($500,000.00) which must occur on or before March 31, 2003.

          2. Termination/Property Transfer. The term of each of the Leases is
hereby amended to terminate and expire on the earlier of (i) the Preference
Expiration Date or (ii) such earlier date as is elected by either AMB or Willow
Park, as applicable, for any or each of the Leases, provided that in the event
of a termination pursuant to subclause (ii), AMB or Willow Park, as applicable,
shall provide Tenant with written notice of the same. Except as modified in this
Agreement to the contrary, Tenant shall fully comply with all obligations under
the Leases through the Effective Date, and if the Preference Expiration Date
does not occur, Tenant shall remain fully obligated under, and shall comply
with, the terms of each Lease that has not been terminated prior to the
Preference Expiration Date as set forth in subclause (ii) above. Notwithstanding
anything to the contrary in the Leases, it is understood and agreed that Tenant
shall vacate the Premises on or prior to the Effective Date, and that Tenant
shall leave the Premises in the Premises Existing Condition with all
improvements, furniture, fixtures, and equipment remaining (including, without
limitation, all lab benches, tables, generators, vacuum pumps, air filtering
systems, etc.). Subject to Section 2B below, Willow Park and Tenant agree that
all improvements, furniture, fixtures, and equipment in the 1003 Premises as of
the Effective Date shall become the property of Willow Park, free and clear of
claims by any third parties, and Tenant hereby transfers all right, title and
interest in such items to Willow Park, fully as though by bill of sale, on an
"as is" basis without representation, warranty or recourse as to the condition

                                       2

<PAGE>

of such property. Subject to Section 2B, Tenant does warrant title to such
property free and clear of claims by any third parties. Subject to Tenant's
decommissioning obligations as set forth below, Willow Park shall accept the
1003 Premises in the Premises Existing Condition upon Termination of such Lease.
AMB Acknowledges and agrees that Tenant has vacated the 1210 Premises and the
1255 Premises prior to the date of this Agreement and that AMB has accepted the
condition of the 1210 Premises and the 1255 Premises in the Premises Existing
Condition. AMB and Tenant agree that all improvements, furniture, fixtures, and
equipment in the 1255 Premises and the 1210 Premises as of March 19, 2003 shall
become the property of AMB, free and clear of claims by any third parties, and
Tenant hereby transfers all right, title and interest in such items to AMB,
fully as though by bill of sale, on an "as is" basis without representation,
warranty or recourse as to the condition of such property. Tenant does warrant
title to such property free and clear of claims by any third parties. Subject to
Section 2B, as soon as such information is available and in any event on or
prior to April 10, 2003, Tenant shall provide such information and documents as
Landlords may reasonably require to verify the status of the title to the
property, referenced above, that is being transferred to Landlord including,
without limitation, copies of all security agreements and financing statements
that Tenant has granted to third parties.

               A. Landlords' Access. Concurrently with the execution of this
Agreement, Tenant shall deliver keys to the Premises to the Landlords so that
the Landlords may commence marketing the Premises. Tenant represents that as of
the execution of this Agreement it is no longer conducting business from the
Premises and the Premises are and shall be available to Landlord for showing to
prospective tenants at all times. Landlord shall have the right at any and all
times to enter the Premises for the purpose of preparing the Premises to
re-lease, for showing the Premises, and/or for any other purpose related to
Landlords efforts to re-let the Premises, and Tenant shall not take any action
that would interfere with Landlord's ability to release the Premises or with a
Replacement Tenant's use of the Premises.

               B. GE Capital Lien on Certain Personal Property at the 1003
Premises. Tenant and Landlords acknowledge and agree that certain of the
Tenant's personal property located at the 1003 Premises (the "1003 Personal
Property") is presently subject to a security interest in favor of GE Capital
(the "GE Capital Lien"). Tenant agrees that it shall cause the GE Capital Lien
to be released and terminated as to the 1003 Personal Property as soon as
possible after the Effective Date and in no event later than April 10, 2003. As
soon as such information is available and in any event on or prior to April 10,
2003, Tenant shall provide Willow Park with evidence reasonably acceptable to
Willow Park evidencing the termination and release of the GE Capital Lien. In
addition, if Landlord reasonably requests information regarding any other
possible lien on the 1003 Property, Tenant shall promptly provide assurance and
documents evidencing that no such liens exist.

          3. Payments. As consideration for this Agreement, and as consideration
for any and all outstanding or overdue rentals and any and all other outstanding
or overdue charges under the Leases, or otherwise, including, but not limited
to, operating expenses, taxes and assessments, extra services, utilities and
HVAC, and to cover Landlords' administrative, processing and legal fees, and to
reimburse Landlords for any loss of rentals or other charges under the Leases
that may hereafter be sustained after the Effective Date as a result of this
Agreement, (a) on and at any time after the Effective Date (i) Willow Park shall
be authorized

                                       3

<PAGE>

and entitled to draw the full amount of the $150,000.00 letter of credit
presently held by Willow Park under the 1003 Lease, (ii) AMB shall be authorized
and entitled to draw the full amount of the $133,422.00 letter of credit
presently held by AMB under the 1255 Lease, and (iii) AMB shall be authorized
and entitled to draw the full amount of the $147,816.00 letter of credit
presently held by AMB under the 1210 Lease, (b) on and at any time after the
Effective Date the Landlords shall be entitled to retain, apply and offset any
amounts which might otherwise be due Tenant under the Leases, (c) upon Tenant's
consummation of the Interim Financing, Tenant shall pay Landlords, in
immediately available funds by federal wire transfer, the Termination Payment
and (d) Tenant shall issue to Landlords the Warrant (as defined in Section 8,
below). AMB and Willow Park acknowledge and agree that they will allocate the
Termination Payment among themselves as they may agree in their sole discretion.
Notwithstanding the foregoing, Landlords and Tenant agree that Tenant's
obligation to pay the Termination Fee is expressly conditioned on Tenant's
consummation of the Interim Financing. In the event that the Termination Payment
is made and the Preference Expiration Date does not occur, Landlords shall apply
the $500,000.00 Termination Payment to the monetary obligations under the Leases
for the month in which such payment was made, then to the monetary obligations
under the Leases for each subsequent month following such payment, and the
balance, if any, shall be deemed additional security under the Leases allocated
among the Leases as the Landlords agree in their sole discretion.

          4. Mutual Releases. Effective on the Preference Expiration Date (if
such occurs), Landlords and Tenant hereby forever release and discharge each
other, and their respective partners, officers, directors, agents, trustees,
beneficiaries, and employees, of and from any and all claims, acts, damages,
demands, rights of action and causes of action which each party ever had, now
has, or in the future may have, against the other, arising from or in any way
connected with the Leases. This release is intended as a full settlement and
compromise of each, every and all claims of every kind and nature relating to
the Leases. Landlords and Tenant expressly waive any and all rights which they
may have under Section 1542 of the Civil Code of the State of California
pertaining to the Leases and the occupancy of the Premises (or such similar
statutes), which provides as follows:

          "A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES
          NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE
          RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS
          SETTLEMENT WITH THE DEBTOR."

          Landlords and Tenant understand and agree that by execution of this
Agreement, each party and its partners, officers, directors, agents, trustees,
beneficiaries, and employees do not admit any liability of any nature
whatsoever. This Agreement is made entirely as a compromise and for the purpose
of terminating the Leases and settling and extinguishing the respective claims,
acts, damages, demands, rights of action or causes of action of the parties
hereto.

          5. Pending Actions. Landlords and Tenant acknowledge that Willow Park
and AMB have each filed a separate legal action in the San Mateo County Superior
Court under Case Number CIV 429871 and CIV 429872, respectively, against Tenant
in respect of the Leases (the "Actions"). Landlords and Tenant agree that as of
the Effective Date Landlords shall

                                       4

<PAGE>

suspend further enforcement of the rights granted to them by the court under the
Actions and upon the Preference Expiration Date, Landlords shall promptly
dismiss the Actions and terminate any execution proceedings commenced It is
agreed that if the Interim Financing and Termination Payment do not timely
occur, as set forth above, Landlords may proceed with all rights under the
Actions.

          6.   Representations.

               (a) Each party represents to the others that it has full power
and authority to execute this Agreement.

               (b) Each party represents to the others that it has not made any
assignment, sublease, transfer, conveyance or other disposition of the Lease or
any interest in the Lease or the Premises, and has no knowledge of any existing
or threatened claim, demand, obligation, liability, action or cause of action
arising from or in any manner connected with the Lease or the Premises by any
other party.

               (c) Subject to the second sentence of this Section 6(c), Tenant
represents that the Termination Fee hereunder, as a percentage of the total
lease payments (base rent and common area maintenance charges) for the remainder
of the initial term of the Leases, is equal to at least 95% of the highest
termination fee paid to any other landlord, as a percentage of the total lease
payments (base rent and common area maintenance charges) for the remainder of
the initial term of the respective leases, under the Other Settlement Agreements
covering any lease with a remaining term in excess of 12 months that Tenant has
entered into or that Tenant shall enter into with Tenant's other landlords
between the Effective Date and the first anniversary thereof. Landlords
acknowledge and agree that (a) the Other Settlement Agreement that Tenant
entered into in respect of its San Diego facility lease is not covered by the
foregoing representation since the consideration provided by Tenant under said
arrangement consisted of a barter of services (the value of which is very
difficult to determine), (b) for purposes of the forgoing representation, the
amount of the most recent monthly charges for the common area maintenance
charges under the applicable leases were utilized to calculate the common area
maintenance charges under the applicable leases for the remainder of their
respective terms and (c) attached hereto as Exhibit A is a spread sheet
reflecting the methodology employed by Tenant in its calculations to make the
foregoing representation.

          7. Decommissioning. Willow Park and Tenant acknowledge and agree that
notwithstanding anything in this Agreement to the contrary, approximately 1,800
square feet of space at the 1003 Premises is undergoing the decommissioning
process with the County of San Mateo and the State of California. Based on
Tenant's consultation with its consultant, $12,000 is an estimate (the
"Decommissioning Estimate") of the total cost required to cause the decommission
process to be completed. On or prior to the Effective Date Tenant shall deposit
with Willow Park an amount equal to the Decommissioning Estimate (the
"Decommissioning Estimate Deposit") to be applied by Willow Park to pay the
costs and expenses of such decommissioning. Tenant shall be responsible for all
costs and expenses for the decommissioning in excess of the Decommissioning
Estimate Deposit and shall pay the same within five (5) days of receiving an
invoice therefore. Tenant shall cause such decommissioning of said space to be
completed at the earliest possible date in compliance with all applicable laws.

                                       5

<PAGE>

Tenant shall fully cooperate with any environmental consultant retained by
Willow Park to monitor the status of Tenant's decommissioning and Willow Park's
consultant is authorized, but not obligated, to take any action it deems
appropriate to assist in or expedite the decommissioning.

          8. Warrants. As additional consideration for the termination of the
Leases, and subject to the accuracy of the representations by Landlords made in
any such warrant:

               (a) In the event there is a closing of an Equity Financing
(defined below) prior to August 31, 2003, (which shall require approval of a
majority of the total votes cast on the proposal in a meeting of Tenant's
stockholders) and so long as Landlords shall not have previously elected to
receive a Common Stock or other warrant pursuant to clause (b) or (c) below,
immediately prior to the closing of the Equity Financing, Tenant shall issue to
Willow Park (or any affiliate of Willow Park designated by Willow Park) a
warrant in substantially the form attached hereto as Exhibit B-1 (with
appropriate changes in the event such warrant is to be issued as a Common Stock
warrant pursuant to the terms hereof) and to AMB a warrant in substantially the
form attached hereto as Exhibit B-2 (with appropriate changes in the event such
warrant is to be issued as a Common Stock warrant pursuant to the terms hereof)
(collectively, the "Warrants") to purchase the same class and series of shares
of Tenant's stock sold in Tenant's anticipated Equity Financing. The exercise
price per share of the Warrants shall be the per share purchase price to be paid
by the other purchasers in such financing, and the number of shares underlying
both Warrants in the aggregate shall be 250,000 (as adjusted for stock splits,
stock dividends, reclassification and the like) (the number of shares subject to
each Warrant shall be designated by Landlords, subject to such aggregate total
for both Warrants). The term "Equity Financing" shall mean the sale by Tenant of
not less than Ten Million Dollars ($10,000,000.00) of its equity securities,
which securities Tenant currently expects to be Series A Preferred Stock with a
purchase price per share equal to 75% of the 5-trading day trailing average
closing price of Tenant's Common Stock ending on the third day prior to the
closing date of the Equity Financing. In this case, Landlords shall be granted
the same registration rights as the purchasers of Tenant's stock in the Equity
Financing, as if Landlords were a purchaser in such Equity Financing (except for
any monetary penalties associated with any effectiveness deadline for the resale
registration statement to the extent the Warrants remain unexercised prior to
such deadline).

               (b) At any time after the date hereof and prior to August 31,
2003, either Landlord may elect to receive a Common Stock warrant at an exercise
price per share equal to the lesser of (i) the closing market price of the
Tenant's Common Stock on the trading day immediately prior to the date of this
Agreement (as adjusted for stock splits, stock dividends, reclassification and
the like) or (ii) the closing market price of the Tenant's Common Stock on the
trading day immediately prior to the date of issuance of the Warrants (as
adjusted for stock splits, stock dividends, reclassification and the like). In
this case, the number of shares underlying both Warrants in the aggregate will
be 250,000 (as adjusted for stock splits, stock dividends, reclassification and
the like) (the number of shares subject to each Warrant shall be designated by
Landlords, subject to such aggregate total for both Warrants). Tenant shall
issue such Common Stock warrant within 3 business days of receipt of such
Landlord's written notice of such election. In this case, such Landlord shall be
granted the same registration rights as the purchasers of Tenant's stock would
have received in the Equity Financing (even if such Equity

                                       6

<PAGE>

Financing never closes), except that the filing of the initial resale
registration statement shall be made not later than 10 business days following
the issuance of such Common Stock warrant and (in lieu of the monetary penalties
associated with the effectiveness deadline for the resale registration
statement) Tenant shall undertake all reasonable efforts to complete any
required registration requirements so that such Landlord may sell any such
shares at the earliest possible date.

               (c) In the event that a financing does occur but is for less than
Ten Million Dollars ($10,000,000.00) (and is therefore not deemed to be the
Equity Financing), so long as Landlords shall not have previously elected to
receive a Common Stock warrant pursuant to clause (b) above, either Landlord may
at its option elect to have its Warrant exercisable for the shares issued in
such financing with a per share exercise price equal to the per share purchase
price to be paid by the other purchasers in such financing, and using the forms
of warrants attached as Exhibits B-1 and B-2 (with appropriate changes for such
financing). In this case, the number of shares underlying both Warrants in the
aggregate will be 250,000 (as adjusted for stock splits, stock dividends,
reclassification and the like) (the number of shares subject to each Warrant
shall be designated by Landlords, subject to such aggregate total for both
Warrants). In this case, Tenant shall issue such warrant immediately prior to
such financing provided it has received written notice of such election from
such Landlord at least 3 business days prior to the closing of such financing.
Tenant shall provide notice of such financing to Landlords at least 2 weeks
prior to the closing of such financing. In this case, such Landlord shall be
granted the same registration rights as the purchasers of Tenant's stock in such
financing, as if Landlords were purchasers in such financing (except for any
monetary penalties associated with any effectiveness deadline for the resale
registration statement to the extent the Warrants remain unexercised prior to
such deadline).

               (d) In the event the Equity Financing has not occurred prior to
August 31, 2003, so long as Landlords shall not have previously elected to
receive a warrant pursuant to clause (b) or (c) above, the Warrants shall be
issued on September 1, 2003 and be exercisable for Tenant's Common Stock at an
exercise price per share equal to the lesser of (i) the closing market price of
the Tenant's Common Stock on the trading day immediately prior to the date of
this Agreement (as adjusted for stock splits, stock dividends, reclassification
and the like) or (ii) the closing market price of the Tenant's Common Stock on
the trading day immediately prior to the date of issuance of the Warrants (as
adjusted for stock splits, stock dividends, reclassification and the like). In
this case, the number of shares underlying both Warrants in the aggregate will
be 250,000 (as adjusted for stock splits, stock dividends, reclassification and
the like) (the number of shares subject to each Warrant shall be designated by
Landlords, subject to such aggregate total for both Warrants). In this case,
Landlords shall be granted the same registration rights as the purchasers of
Tenant's stock would have received in the Equity Financing (even if such Equity
Financing never closes), except that the filing of the initial resale
registration statement shall be made not later than 10 business days following
the issuance of such Common Stock warrant and (in lieu of the monetary penalties
associated with the effectiveness deadline for the resale registration
statement) Tenant shall undertake all reasonable efforts to complete any
required registration requirements so that Landlords may sell any such shares at
the earliest possible date.

                                       7

<PAGE>

          9. Landlords' Lease Reinstatement Option. In the event that (a) Tenant
fails to vacate any of the Premises pursuant to the terms of Section 2 above,
(b) the inventory, furniture, fixtures, and equipment is not transferred to
Landlords free and clear of any claims pursuant to the terms of Section 2 above,
and/or any information or documentation required pursuant to Section 2 above is
not timely delivered, (c) Landlords are not allowed unimpeded access pursuant to
the terms of Section 2 A above, (d) Landlords are prevented from drawing upon
the full amount of all letters of credit at any time they desire pursuant to
Section 3 above, (e) Landlords are required, for any reason, to pay back the
Termination Payment, (f) the releases of Tenant, as set forth in Section 4
above, are not fully enforceable, (g) any representation of Tenant under this
Agreement is not true and correct, (h) Tenant does not comply with it's
decommissioning requirements under Section 7 above, (i) Tenant breaches any term
of this Agreement, or (i) the warrant is not issued pursuant to the terms of
Section 8 above or Landlord is prevented from timely obtaining shares of
Tenant's stock pursuant to the terms of the Warrant; Landlords may, at either or
both of their option, elect that their respective Leases (or either of them as
the case may be) with Tenant, as reference above, be reinstated in full force
and effect and upon such election, Tenant shall immediately pay to the
respective Landlord all amounts accrued and unpaid under each such reinstated
Lease. In such event any amounts paid hereunder and allocated to such respective
Lease by Landlords shall be deemed held by such respective Landlord as a
security deposit under such Lease.

          10. No Disclosure. Landlords and Tenant each agree that they shall not
intentionally and voluntarily disclose any of the matters set forth in this
Agreement or disseminate or distribute any information concerning the terms,
details or conditions hereof to any person, firm or entity without obtaining the
express written approval of the other, except as may be necessary to enforce the
terms of this Agreement or as may be required by law. This Section shall have no
application in the event of an Insolvency Proceeding.

          11. No Offer. This Agreement shall not be binding until executed and
delivered by the parties. This Agreement shall not be relied upon by any other
party, individual, corporation, partnership or other entity as a basis for
terminating its lease with Landlords.

          12. Whole Agreement. The mutual obligations of the parties as provided
herein are the sole consideration for this Agreement, and no representations,
promises or inducements have been made by the parties other than as appear in
this Agreement. This Agreement may not be amended except in writing signed by
the parties.

          13. Miscellaneous. Warranties, representations, agreements, and
obligations contained in this Agreement shall survive the execution and delivery
of this Agreement and shall survive any and all performances in accordance with
this Agreement. This Agreement may be executed in any number of counterparts
which together shall constitute the Agreement. Faxed signatures hereon shall be
deemed originals for all purposes. If any party obtains a judgment against any
other party by reason of breach of this Agreement, reasonable attorneys' fees as
fixed by the court shall be included in such judgment. This Agreement and the
terms and provisions hereof shall inure to the benefit of and be binding upon
the heirs, successors and assigns of the parties. This Agreement shall be
construed and enforced in accordance with the laws of the State of California.
Except as defined herein to the contrary, all terms used and not otherwise
defined in this Agreement shall have the same meanings as the defined terms in
the Leases.

                                       8

<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first written above.

                                 WILLOW PARK:

                                 WILLOW PARK HOLDING COMPANY II, LLC
                                 a Delaware limited liability company

                                 By: AMB Property, L.P., a Delaware limited
                                     partnership, its Manager

                                     By: AMB Property Corporation, a
                                         Maryland corporation, its General
                                         Partner

                                         By:
                                            ------------------------------------
                                              John Rossi

                                         Its: Senior Vice President

                                         Date:
                                              ----------------------------------

                                 AMB:

                                 AMB PROPERTY, L.P.,
                                 a Delaware limited partnership

                                 By: AMB PROPERTY CORPORATION
                                     a Maryland corporation, its general partner

                                         By:
                                            ------------------------------------
                                              John Rossi

                                         Its: Senior Vice President

                                         Date:
                                              ----------------------------------

                                       9

<PAGE>

                                 TENANT:

                                 DELTAGEN, INC.,
                                 a Delaware corporation

                                 By:
                                    --------------------------------------------

                                 Its:
                                     -------------------------------------------

                                 By:
                                    --------------------------------------------

                                 Its:
                                     -------------------------------------------

                                 Date:
                                      ------------------------------------------

If Tenant is a CORPORATION, the authorized officers must sign on behalf of the
corporation and indicate the capacity in which they are signing. The Lease must
be executed by the president or vice-president and the secretary or assistant
secretary, unless the bylaws or a resolution of the board of directors shall
otherwise provide, in which event, the bylaws or a certified copy of the
resolution, as the case may be, must be attached to this Lease.

                                       10

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