Document:

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                                                                 Exhibit 10.30.1

                                Option Agreement

     This Option Agreement (this "Agreement") is made as of March   , 2003 (the
                                                                  --
"Effective Date"), by and between Woodside Technology Center, LLC, a Delaware
limited liability company ("Landlord"), and Deltagen, Inc., a Delaware
corporation ("Tenant").

                                    Recitals

     A. Landlord and Tenant have previously entered into that certain Building
Lease dated July 11, 2001 (the "Lease"), covering certain premises located at
740 Bay Road, Redwood City, California (the "Premises"), said Premises being
more particularly described in the Lease. Capitalized terms used but not defined
herein shall have the meanings set forth in the Lease.

     B. Landlord desires to grant to Tenant, and Tenant desires to acquire from
Landlord, an option to cancel and terminate the Lease prior to the scheduled
expiration date thereof (the "Scheduled Expiration Date"), all upon and subject
to the terms and conditions herein provided.

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

1.   Grant of Option

     (a) Subject to the terms and conditions set forth in this Agreement,
Landlord hereby grants to Tenant an option to terminate the Lease prior to the
Scheduled Expiration Date (the "Termination Option"). The Termination Option
shall be exercisable by written notice (the "Termination Notice") from Tenant to
Landlord given not later than June 30, 2003 (the "Outside Election Date");
provided, however, that Tenant shall have the right to extend the Outside
Election Date on the terms set forth in Paragraph 1(b) below. Any such
Termination Notice given by Tenant to Landlord shall be irrevocable. In the
event Tenant fails to exercise the Termination Option on or before the Outside
Election Date, then the Termination Option shall be void and of no further force
or effect and the parties' rights and obligations under the Lease shall be as
though this Agreement had never existed. If Tenant validly exercises the
Termination Option, then the Lease shall be terminated on the second (2nd) day
following the date of Landlord's receipt of the Termination Notice (such second
(2nd) day being herein referred to as the "Termination Date"). From and after
the Termination Date, Tenant shall have no further rights under the Lease,
notwithstanding anything to the contrary set forth therein or in any other
agreement between Landlord and Tenant, including, without limitation, the letter
dated July 10, 2001, provided by Landlord to Tenant (and acknowledged by Tenant)
in connection with Tenant's sublease from Heartport, Inc. of the premises
situated at 700 Bay Road.

     (b) (i) Tenant shall have the right to extend the Outside Election Date to
July 31, 2003 (the "First Extension Option") by delivering to Landlord, on or
before June 24, 2003, written notice of such election, together with an
extension fee in the amount of Twenty-Five Thousand Dollars ($25,000.00). Such
fee shall be fully earned when paid and shall not be refundable. In the event
Tenant fails to validly exercise the First Extension Option as provided in this

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Paragraph 1(b)(i), the First Extension Option shall be void and the Outside
Election Date shall be and remain June 30, 2003.

          (ii) If and only if Tenant validly exercises the First Extension
Option, then Tenant shall have the further right to extend the Outside Election
Date to August 31, 2003 (the "Second Extension Option") by delivering to
Landlord, on or before July 24, 2003, written notice of such election, together
with an additional extension fee in the amount of Twenty-Five Thousand Dollars
($25,000.00). Such fee shall be fully earned when paid and shall not be
refundable. In the event Tenant fails to validly exercise the Second Extension
Option as provided in this Paragraph 1(b)(ii), the Second Extension Option shall
be void and the Outside Election Date shall be and remain June 30, 2003 (or, if
Tenant has previously validly exercised the First Extension Option, July 31,
2003).

     (c) Upon termination of the Lease, Landlord and Tenant shall have no
further rights, obligations or claims with respect to each other arising under
the Lease, except for any indemnification obligations of Tenant which, under the
terms of the Lease, expressly survive the termination or expiration thereof.

     (d) Without limiting the terms of Paragraph 1(c) above, from and after the
Effective Date, Tenant shall have no obligation to pay to Landlord any Gross
Rent which has accrued prior to, but which remains unpaid as of, the Effective
Date (except that Gross Rent accruing under the Lease from and after March 1,
2003 shall be paid by the drawing by Landlord on the Letter of Credit as
contemplated under Paragraph 4(a) below), and Landlord shall have no obligation
to repay or refund to Tenant any Gross Rent that has been overpaid by Tenant
prior to the Effective Date. By way of example, Tenant shall have no obligation
to pay to Landlord, and Landlord shall have no obligation to refund to Tenant,
any amounts otherwise owing from one party to the other in connection with any
Building Operating Cost Adjustment completed after the Effective Date.

2.   Termination Fee

     (a) In consideration of Landlord's willingness to terminate the Lease on
the Termination Date, Tenant shall pay to Landlord a termination fee (the
"Termination Fee") equal to the sum of (i) One Million Two Hundred Thousand
Dollars ($1,200,000.00) (the "Cash Component"), plus (ii) an amount equal to the
remaining balance of the Letter of Credit following the draws thereon by
Landlord contemplated under Paragraph 4(a) below (the "LC Component"), plus
(iii) Two Hundred Thousand Dollars ($200,000.00) (the "Post Termination
Component").

     (b) The Termination Fee shall be paid to Landlord as follows:

          (i) Tenant shall pay the Cash Component of the Termination Fee to
Landlord concurrently with the delivery of the Termination Notice.

          (ii) The LC Component of the Termination Fee shall be paid to Landlord
by the draw by Landlord on the Letter of Credit as contemplated under Paragraph
4(b) below. Tenant shall cooperate with Landlord and shall take such actions as
Landlord may reasonably request (including, without limitation, providing
instructions to the Bank and, if necessary, causing the Bank to modify the
Letter of Credit) to assist Landlord in drawing on the Letter of Credit. The

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LC Component of the Termination Fee shall be deemed paid when Landlord actually
receives the Letter of Credit Proceeds from the Bank.

          (iii) The Post Termination Component of the Termination Fee shall be
due and payable on January 15, 2005.

3.   Termination Conditions

     The following conditions shall be conditions precedent to the effectiveness
of any Termination Notice given by Tenant to Landlord and to the termination of
the Lease on the Termination Date (collectively, the "Termination Conditions"):

     (a) Performance by Tenant. Tenant shall have performed all of its
obligations under the Lease through the Termination Date, as and when such
obligations shall have become due (except that Gross Rent accruing under the
Lease from and after March 1, 2003 shall be paid by the drawing by Landlord on
the Letter of Credit as contemplated under Paragraph 4(a) below).

     (b) Payment of Cash Component of Termination Fee. Tenant shall have paid
the Cash Component of the Termination Fee to Landlord concurrently with the
delivery of the Termination Notice as required under Paragraph 2(b)(i) above.

     (c) Furnishings. No later than May 1, 2003, Tenant shall have delivered to
Landlord (i) a duly executed bill of sale in the form of Exhibit A hereto (the
"Bill of Sale"), pursuant to which Tenant shall transfer and convey to Landlord
(on an "AS-IS" basis without warranty or recourse as to the condition, repair or
merchantability of the same) Tenant's entire right, title and interest in and to
the cubicles, furniture, furnishings, fixtures and equipment (including, without
limitation, all telephones and telecommunications equipment and all telephone
and data wiring) located in the Premises on the Effective Date (collectively,
the "Furnishings"), free and clear of all liens, encumbrances, security
interests and rights of third parties, and (ii) releases, UCC termination
statements and such other documentation as Landlord may reasonably request to
evidence the release of the lien on the Furnishings held by GE Capital.

     (d) Warrants.

          (i) As additional consideration for the termination of the Lease,
Tenant shall have issued to Landlord (or any affiliate of Landlord designated by
Landlord) a warrant in substantially the form attached hereto as Exhibit B (with
appropriate changes in the event such warrant is to be issued as a Common Stock
warrant pursuant to the terms hereof) (the "Warrant"). The Warrant, at
Landlord's option, will be either (x) a Warrant to purchase the same class and
series of shares of Tenant's stock (the "Preferred Stock") sold in Tenant's
anticipated equity Financing (as defined below), subject to approval of such
Financing by a majority of the total votes cast on the proposal in a meeting of
Tenant's stockholders, or (y) a Warrant to purchase shares of Tenant's Common
Stock. The exercise price per share of the Warrant shall be (x) in the case of
the Preferred Stock, the price per share paid to Tenant by the investor
purchasers in the Financing or (y) in the case of the Common Stock, the average
closing market price of the Tenant's Common Stock for the 10 trading days
immediately prior to the issuance of the Warrant. The number of shares
underlying the Warrant shall equal: (A) in the case of the Preferred Stock, (1)
900,000 (as adjusted for stock splits, stock dividends,

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reclassification and the like) if the Financing is in an amount of at least Five
Million Dollars ($5,000,000.00) but not greater than Ten Million Dollars
($10,000,000.00), or (2) if the Financing is in an amount in excess of Ten
Million Dollars ($10,000,000.00), an amount equal to the sum of (x) 900,000 (as
adjusted for stock splits, stock dividends, reclassification and the like) plus
(y) 0.05 shares (as adjusted for stock splits, stock dividends, reclassification
and the like) for each Dollar in excess of Ten Million Dollars ($10,000,000.00),
rounded up to the nearest whole share; or (B) in the case of the Common Stock,
900,000 (as adjusted for stock splits, stock dividends, reclassification and the
like). The term "Financing" shall mean the sale by Tenant of not less than Five
Million Dollars ($5,000,000.00) 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
Financing. In the event Landlord is granted a Warrant to purchase Common Stock
prior to the Financing, and the Financing subsequently occurs prior to August
31, 2003, Landlord shall have the right, at its option, to exchange such Warrant
for a Warrant to purchase shares of Preferred Stock. In the event Landlord is
granted a Warrant to purchase Preferred Stock and there are additional sales of
Preferred Stock in the Financing following the issuance of the Warrant, but
prior to August 31, 2003, the Warrant shall be immediately adjusted (pursuant to
the formula above) to increase the number of shares of Preferred Stock
purchasable upon exercise of the Warrant.

          (ii) Upon the issuance of the Warrant, Landlord shall be granted the
same registration rights as the investor purchasers of Tenant's Preferred Stock
in the Financing and shall be considered and treated as if Landlord were an
original investor purchaser in the Financing (regardless of whether the Warrant
is exercisable for Preferred Stock or Common Stock). In the event the Financing
has not occurred at the time of issuance of the Warrant and Landlord has
received a Warrant to purchase Common Stock, the Landlord shall be granted those
registration rights set forth in the attached Exhibit C hereto. In the event
Landlord is granted a Warrant to purchase Common Stock prior to the Financing
and receives the registration rights set forth on Exhibit C hereto, and the
Financing subsequently occurs prior to August 31, 2003 in which the investor
purchasers in the Financing receive registration rights superior to those set
forth in the attached Exhibit C, Landlord shall have the right, at its option,
to receive such superior registration rights as if it were an original investor
purchaser in the Financing.

          (iii) If prior to the issuance of the Warrant there shall be a capital
reorganization (other than a combination or subdivision of Tenant's stock) (a
"Reorganization"), or a merger or consolidation of Tenant with another
corporation (other than a merger with another corporation in which Tenant is the
continuing corporation and which does not result in any reclassification or
change of outstanding securities issuable upon exercise of the Warrant or a
merger effected exclusively for the purpose of changing the domicile of Tenant)
(a "Merger"), then, as a part of such Reorganization or Merger, lawful provision
shall be made so that the Landlord is issued a Warrant exercisable for that
number of shares of stock or other securities or property of Tenant or the
successor corporation resulting from such Reorganization or Merger to which a
holder of Tenant's stock deliverable upon exercise of the Warrant would have
been entitled under the provisions of the agreement relating to such
Reorganization or Merger if the Warrant had been issued and exercised
immediately prior to such Reorganization or Merger. In any such case,
appropriate adjustment (as determined in good faith by Tenant's Board of
Directors) shall be made in the application of the provisions of the Warrant
with respect to the rights and interests of

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Landlord (including registration rights) after the Reorganization or Merger to
the end that the provisions of the Warrant 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 the Warrant.

     (e) Termination of Leases. By the Termination Date, (i) Tenant's lease
agreements covering Tenant's premises in Menlo Park and Alameda shall have been
terminated, and (ii) Tenant shall have no further obligations under the lease
agreement for its San Diego premises, except for obligations which have been
assigned to and assumed by Bristol Myers Squibb (or an affiliate thereof)
("Bristol Myers") and for which Bristol Myers has provided an indemnity to
Tenant.

The Termination Conditions are for the sole benefit of Landlord and may, at the
sole discretion of Landlord, be waived by Landlord.

4.   Letter of Credit

     (a) Tenant has previously delivered to Landlord a Letter of Credit in the
amount of One Million Seven Hundred One Thousand Four Hundred Eighty-One Dollars
($1,701,481.00) pursuant to Section 5.14 of the Lease. Landlord shall have the
right to draw on the Letter of Credit to pay Gross Rent accruing under the Lease
from and after March 1, 2003.

     (b) Landlord shall have the right, at any time following Landlord's receipt
of the Termination Notice, to draw on the then-remaining balance of the Letter
of Credit and to retain the Letter of Credit Proceeds to pay the LC Component of
the Termination Fee as contemplated under Paragraph 2(b)(ii) above.

5.   Surrender of the Premises.

     Tenant and Landlord acknowledge that Tenant has, prior to the Effective
Date, vacated and surrendered the Premises to Landlord. Landlord acknowledges
that it has inspected the vacated Premises and agrees that, subject to Paragraph
3(c) above, Landlord accepts the Premises in its "AS-IS" condition as of the
Effective Date.

6.   Sublease Agreement

     At the request of Landlord, which request may be made at any time after the
Effective Date, Tenant shall sublease all or a portion (as designated by
Landlord) of the Premises (the portion, including all, of the Premises so
designated by Landlord being herein referred to as the "Sublease Premises") to
Landlord for a term designated by Landlord without the payment of rent or any
other consideration pursuant to a sublease agreement prepared by Landlord and
approved by Tenant, which approval shall not be unreasonably withheld,
conditioned or delayed (the "Sublease Agreement"). The Sublease Agreement shall
provide Landlord with the right to use (and to permit the Subsublessee (as
hereinafter defined) to use) the Furnishings without charge and the unrestricted
rights, without the consent of Tenant, to subsublease the Sublease Premises to a
third party selected by Landlord in its sole discretion (the "Subsublessee"),
such subsublease to be on terms and conditions acceptable to Landlord and the
Subsublessee, to make any alterations, additions or improvements to the Premises
desired by Landlord or the Subsublessee, each in the exercise of its sole
discretion, and to use the Premises for any purpose approved by

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Landlord. If, under the terms of the Lease, Landlord has the right to consent to
an act on the part of Tenant, then Landlord shall have the right to consent to
any such act on the part of the Subsublessee without the further consent of or
approval by Tenant (as the sublandlord under the Sublease Agreement).
Notwithstanding anything to the contrary contained in the Lease or in this
Agreement, (a) Tenant's obligations under the Lease shall not be increased as
the result of Landlord's sub-subletting activities or the terms of any such
subsublease, (b) Tenant shall not be entitled to any "sublease profits" or any
portion of the rent or other consideration received by Landlord under the
Subsublease, (c) Tenant shall not be responsible for any damage to the Premises
caused by Landlord or any Subsublessee, (d) Tenant shall have no obligation to
remove or restore any alterations made to the Premises by Landlord or any
Subsublessee, and (e) Tenant shall not have any liability to Landlord or any
Subsublessee arising out of or in connection with any subsublease. Any rent or
other consideration received by Landlord under any subsublease shall be in
mitigation of any damages Landlord may suffer in the event Tenant does not
exercise the Termination Option by the Outside Election Date.

7.   Abandoned Property

     In addition to any rights Landlord may have under the Lease or this
Agreement, subject to Paragraph 3(c) above, Landlord, at its sole option, may
deem any personal property in, on or attached to the Premises and remaining in
or on the Premises after the Termination Date or, if earlier, the commencement
date of the Subsublease (the "Abandoned Property"), whether or not belonging to
Tenant, to be abandoned, and Landlord may dispose of the Abandoned Property as
it in its sole discretion deems appropriate. Tenant shall not be entitled to any
proceeds received by Landlord as a result of the disposition of the Abandoned
Property. Tenant waives, to the greatest extent permitted by law, all of its
rights under California Civil Code Sections 1980, et seq. as the same may be
amended from time to time, and any related and successor statutes thereto.

8.   Representations and Warranties

     (a) Tenant hereby represents and warrants to Landlord the following, each
of which shall survive the termination of the Lease and the vacation and
surrender of the Premises:

          (i) Tenant has not made any assignment, sublease, transfer, conveyance
or other disposition of the Lease, Tenant's leasehold estate, the Premises, or
any other right, title or interest under or arising by virtue of the Lease, or
of any claim, demand, obligation, liability, action or cause of action arising
from or pursuant to the Lease or arising from any rights of possession arising
under or by virtue of the Lease, Tenant's leasehold estate, or the Premises.

          (ii) Tenant has the full power, capacity, authority and legal right to
execute and deliver this Agreement.

          (iii) The person executing this Agreement on behalf of Tenant has the
full right and authority to execute this Agreement on behalf of Tenant and to
bind Tenant without the consent or approval of any other person or entity.

          (iv) This Agreement is a legal, valid and binding obligation of
Tenant, enforceable against Tenant in accordance with its terms.

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          (v) Tenant has not (A) made a general assignment for the benefit of
creditors, (B) filed any voluntary petition in bankruptcy or suffered the filing
of an involuntary petition by its creditors, (C) suffered the appointment of a
receiver to take possession of all or substantially all of its assets, (D)
suffered the attachment or other judicial seizure of all or substantially all of
its assets, (E) admitted in writing its inability to pay its debts as they
become due, or (F) made an offer of settlement, extension or composition to its
creditors generally.

          (vi) Tenant has from time to time in the past engaged in, but is not
currently engaged in any discussion (A) with any representative of any
corporation or corporations regarding the consolidation or merger of Tenant with
or into any such corporation or corporations, (B) with any corporation,
partnership, association or other business entity or any individual regarding
the sale, conveyance or disposition of all or substantially all of the assets of
Tenant or a transaction or series of related transactions in which more than
fifty percent (50%) of the voting power of Tenant is disposed of (other than the
Financing), or (C) regarding any other form of acquisition, liquidation,
dissolution or winding up of Tenant.

          (vii) This Agreement has been duly authorized, executed and delivered
by Tenant. All corporate action on the part of Tenant and its stockholders
(except as contemplated by the Financing stock purchase agreement), directors
and officers necessary for the authorization, execution and delivery of this
Agreement, the performance of all Tenant'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 Agreement constitutes and
when issued, the Warrant will constitute, the legal, valid and binding
obligation of Tenant, enforceable against Tenant in accordance with its terms,
subject to (A) laws of general application relating to bankruptcy, insolvency
and the relief of debtors, (B) rules of law governing specific performance,
injunctive relief and other equitable remedies, and (C) the limitations imposed
by applicable federal or state securities laws on indemnification provisions.

          (viii) The execution, delivery and performance of this Agreement, and
the issuance of the 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 (A) any of the terms and provisions
of the charter, as restated as contemplated hereby, or bylaws of Tenant or any
of its subsidiaries, (B) 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 Tenant or any subsidiary
of Tenant or any of their respective properties, or (C) 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 Tenant or any such subsidiary is a party or by
which Tenant or any such subsidiary is bound or to which any of the properties
of Tenant 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 Tenant and its subsidiaries taken as a whole). Tenant
has full power and authority to authorize, issue and sell the Warrant and shares
issuable upon exercise of the Warrant as contemplated by this Agreement.

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          (ix) All registration statements, proxy statements and other
statements, reports, schedules, forms and other documents filed by Tenant with
the SEC since August 3, 2000, including copies of all the exhibits referenced
therein (the "SEC Documents") are publicly available for review by Landlord. All
statements, reports, schedules, forms and other documents required to have been
filed by Tenant 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): (A) 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 (B) 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.

     (b) Landlord hereby represents and warrants to Tenant the following, each
of which shall survive the termination of the Lease:

          (i) Landlord has the full power, capacity, authority and legal right
to execute and deliver this Agreement.

          (ii) The person executing this Agreement on behalf of Landlord has the
full right and authority to execute this Agreement on behalf of Landlord and to
bind Landlord without the consent or approval of any other person or entity.

          (iii) This Agreement is a legal, valid and binding obligation of
Landlord, enforceable against Landlord in accordance with its terms.

9.   Landlord's Release

     Effective as of the Release Effective Date (as defined below), Landlord
hereby forever releases and discharges Tenant, and its respective partners,
officers, directors, agents, trustees, beneficiaries and employees
(collectively, the "Tenant Parties"), of and from any and all claims, acts,
damages, demands, rights of action and causes of action (collectively, "Claims")
which Landlord ever had, now has, or in the future may have, against Tenant or
the Tenant Parties, arising from or in any way connected with the Lease, except
for those obligations and liabilities contained herein and those obligations of
Tenant referenced in Paragraph 1(c) above. Except as provided in the preceding
sentence, this release is intended as a full settlement and compromise of each,
every and all claims of every kind and nature relating to the Lease. As used
herein, "Release Effective Date" means the date that is one hundred (100) days
after the date on which the payments to Landlord provided for in Paragraphs
2(b)(i) above and 2(b)(ii) above and the warrants issued to Landlord pursuant to
Paragraph 3(c) above are perfected within the meaning of 11 U.S.C. section
547(e) (such 100-day period being herein referred to as the "Post-Payment
Period"). Landlord expressly waives all rights under California Civil Code
Section 1542, which provides that:

          "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

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          EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY
          AFFECTED HIS SETTLEMENT WITH THE DEBTOR."

                                            Initials: Illegible
                                                      --------------------------
                                                      Landlord

     Landlord understands and agrees 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 Lease and
settling and extinguishing the respective claims, acts, damages, demands, rights
of action or causes of action of the parties hereto.

     Notwithstanding the foregoing or anything in this Agreement to the
contrary, Landlord and Tenant agree that the effectiveness of the provisions of
this Paragraph 9 is expressly conditioned upon (i) the valid exercise by Tenant
of the Termination Option, (ii) the payment by Tenant of the Cash Component of
the Termination Fee, (iii) the receipt by Landlord of the LC Component of the
Termination Fee, (iv) the termination of the Lease on the Termination Date, (v)
the satisfaction (or written waiver by Landlord) of the conditions contained in
Paragraph 3 above, and (vi) no case concerning Tenant having been commenced
under Title 11 of the United States Code and Tenant not having made an
assignment for the benefit of creditors on or before the Release Effective Date
(or, if such a case has commenced or such an assignment has been made, the case
was dismissed or closed, or the assignee's duties were terminated or completed,
and no portion of the Termination Fee was recovered and no action or proceeding
to recover any portion of the Termination Fee was pending).

10.  Tenant's Release

     Effective as of the Termination Date, Tenant hereby forever releases and
discharges Landlord, and its respective partners, officers, directors, agents,
trustees, beneficiaries and employees (collectively, the "Landlord Parties"), of
and from any and all Claims which Tenant ever had, now has, or in the future may
have, against Landlord or the Landlord Parties, arising from or in any way
connected with the Lease. This release is intended as a full settlement and
compromise of each, every and all claims of every kind and nature relating to
the Lease. Tenant expressly waives all rights under California Civil Code
Section 1542, which provides that:

          "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."

                                            Initials:
                                                      --------------------------
                                                      Tenant

     Tenant understands and agrees 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

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purpose of terminating the Lease and settling and extinguishing the respective
claims, acts, damages, demands, rights of action or causes of action of the
parties hereto.

11.  General Provisions

     (a) Time of Essence. Time is of the essence in the performance of the
parties' respective obligations set forth in this Agreement.

     (b) Notices. Any notice required or permitted to be given hereunder shall
be given in accordance with the terms of the Lease.

     (c) Entire Agreement. This Agreement constitutes the entire understanding
of the parties with respect to the subject matter hereof and all prior
agreements, representations, and understandings between the parties, whether
oral or written, are deemed null, all of the foregoing having been merged into
this Agreement. The parties acknowledge that each party and/or its counsel have
reviewed and revised this Agreement and that no rule of construction to the
effect that any ambiguities are to be resolved against the drafting party shall
be employed in the interpretation of this Agreement or any amendments or
exhibits to this Agreement or any document executed and delivered by either
party in connection with this Agreement.

     (d) Assignability; Successors Bound. Tenant may not assign its rights,
obligations or interest in this Agreement to any other person or entity without
Landlord's written consent thereto, which consent may be given or withheld in
Landlord's sole and absolute discretion. Any attempted assignment without the
consent of Landlord shall be null and void. No assignment shall release the
Tenant herein named from any obligation or liability under this Agreement. Any
permitted assignee shall be deemed to have made any and all representations and
warranties made by Tenant hereunder, as if the assignee were the original
signatory hereto. This Agreement shall inure to the benefit of and be binding
upon the parties hereto and their respective successors and permitted assigns.

     (e) Severability. If any provision of this Agreement or application to any
party or circumstances shall be determined by any court of competent
jurisdiction to be invalid or unenforceable to any extent, the remainder of this
Agreement or the application of such provision to such person or circumstances,
other than those as to which it is so determined invalid or unenforceable, shall
not be affected thereby, and each provision hereof shall be valid and shall be
enforced to the fullest extent permitted by law.

     (f) Applicable Law. This Agreement shall be governed by and construed under
the laws of the State of California.

     (g) Amendments. This Agreement may be amended or modified only by an
instrument in writing signed by each of the parties hereto.

     (h) Attorneys' Fees. If either party hereto fails to perform any of its
obligations under this Agreement or if any dispute arises between the parties
hereto concerning the meaning or interpretation of any provision of this
Agreement, then the defaulting party or the party not prevailing in such
dispute, as the case may be, shall pay any and all costs and expenses incurred
by the other party on account of such default and/or in enforcing or
establishing its rights

                                       10

<PAGE>

hereunder, including, without limitation, court costs and reasonable attorneys'
fees and disbursements. Any such attorneys' fees and other expenses incurred by
either party in enforcing a judgment in its favor under this Agreement shall be
recoverable separately from and in addition to any other amount included in such
judgment, and such attorneys' fees obligation is intended to be severable from
the other provisions of this Agreement and to survive and not be merged into any
such judgment.

     (i) Counterparts. This Agreement may be executed in counterparts each of
which shall be deemed an original but all of which taken together shall
constitute one and the same instrument.

     In Witness Whereof, the parties have executed this Agreement as of the date
first above written.

           Landlord: 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

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

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

                                         By: Illegible
                                             -----------------------------------
                                         Name: Illegible
                                         Title: EVP

              Tenant: Deltagen, Inc.,
                      a Delaware corporation

                      By:
                          ---------------------------------------
                      Name:
                            -------------------------------------
                      Title:
                             ------------------------------------

                                       11

<PAGE>

                                    Exhibit A

                                  Bill of Sale

     This Bill of Sale and Assignment is executed as of the       day of
                                                            -----
               , 2003, by Deltagen, Inc., a Delaware corporation ("Assignor"),
---------------
in favor of Woodside Technology Center, LLC, a Delaware limited liability
company ("Assignee"), pursuant to that certain Option Agreement dated as of
March    , 2003, by and between Assignor and Assignee (the "Option Agreement").
      ---

     For Value Received, receipt of which is hereby acknowledged, Assignor does
hereby grant, bargain, sell, convey, assign, transfer and set over unto
Assignee, absolutely and not as security, the Furnishings (as defined in the
Option Agreement).

     Assignor does hereby covenant with Assignee that Assignor is the lawful
owner of the Furnishings, that the Furnishings are free and clear of all liens,
encumbrances and rights of third parties, and that the undersigned has good
right to sell the same as aforesaid and will warrant and defend the title
thereto unto Assignee, its successors and assigns, against the claims and
demands of all persons whomsoever. Subject to the foregoing and to the
representations contained in the Option Agreement, Assignor expressly disclaims
any representations or warranties concerning the Furnishings, including, without
limitation, any warranty of merchantability.

     In Witness Whereof, Assignor has executed this Bill of Sale as of the date
first above written.

                                Assignor: Deltagen, Inc.,
                                          a Delaware corporation

                                          By:
                                              ----------------------------------
                                          Name:
                                                --------------------------------
                                          Title:
                                                 -------------------------------

                                      A-1

<PAGE>

                                    Exhibit C

                               Registration Rights

SECTION 1 REGISTRATION OF THE REGISTRABLE SECURITIES; COMPLIANCE WITH THE
          SECURITIES ACT.

     1.1 Registration Procedures. The Company is obligated to do the following:

          (a) No later than ten business days after the issuance of the Common
Stock warrant (the "Filing Deadline"), the Company shall prepare and file with
the SEC one or more registration statements (collectively, the "Registration
Statement") on Form S-1 in order to register with the SEC the resale by the
Purchasers, from time to time, of the Offered Securities and the Common Stock
issuable upon conversion of or as (or issuable upon the conversion or exercise
of any warrant, right or other security that is issued as) a dividend or other
distribution with respect to, or in exchange for or in replacement of, the
Offered Securities (collectively, the "Registrable Securities") through Nasdaq
or the facilities of any national securities exchange on which the Company's
Common Stock is then traded, or in privately negotiated transactions. The
Company shall use its best efforts to cause the Registration Statement to be
declared effective as soon thereafter as possible.

          (b) Not less than five trading days prior to the filing of a
Registration Statement or any prospectus contained in a Registration Statement
(a "Prospectus") or any amendment or supplement thereto, the Company shall, (i)
furnish to the Purchasers for their review copies of all such documents proposed
to be filed (including documents incorporated or deemed incorporated by
reference), (ii) cause its officers and directors, counsel and independent
certified public accountants to respond to such inquiries as the Purchasers
shall deem reasonably necessary and (iii) notify each Purchaser in writing of
the information the Company requires from each such Purchaser to be included in
such Registration Statement.

          (c) The Company shall (i) prepare and file with the SEC (x) such
amendments and supplements to each Registration Statement and the Prospectus
used in connection therewith, and (y) such other filings required by the SEC,
and (ii) take such other actions, in each case as may be necessary to keep the
Registration Statement continuously effective and so that such Registration
Statement will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading, and so that such Prospectus will not contain
an untrue statement of a material fact or omit to state a material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading, until the earlier
of (A) the date that the Purchasers have completed the distribution related to
the Registrable Securities, or (B) such time that all Registrable Securities
then held by the Purchasers can be sold without compliance with the registration
requirements of the Securities Act pursuant to Rule 144(k) under the Securities
Act (the "Effectiveness Period"). The Company shall not, during such period,
voluntarily take any action that would result in the Purchasers not being able
to offer and sell Registrable Securities during that period, unless such action
is taken by the Company in good faith in compliance with Section 1.2(d) below.

                                      C-1

<PAGE>

          (d) Furnish to the Purchasers with respect to the Registrable
Securities registered under the Registration Statement such number of copies of
the Registration Statement, Prospectuses (including supplemental prospectuses)
and preliminary versions of the Prospectus filed with the SEC ("Preliminary
Prospectuses") in conformity with the requirements of the Securities Act and
such other documents as the Purchasers may reasonably request, in order to
facilitate the public sale or other disposition of all or any of the Registrable
Securities by the Purchasers.

          (e) Notify the Purchasers as promptly as reasonably possible and (if
requested by any such Person) confirm such notice in writing no later than one
trading day following the day (i) (A) when the SEC notifies the Company whether
there will be a "review" of a Registration Statement and whenever the SEC
comments in writing on such Registration Statement (the Company shall provide
true and complete copies thereof and all written responses thereto to each of
the Purchasers); and (B) with respect to a Registration Statement or any
post-effective amendment, when the same has become effective; (ii) of any
request by the SEC for amendments or supplements to a Registration Statement or
Prospectus or for additional information; (iii) of the issuance by the SEC of
any stop order suspending the effectiveness of a Registration Statement covering
any or all of the Registrable Securities or the initiation of any proceedings
for that purpose; (iv) of the receipt by the Company of any notification with
respect to the suspension of the qualification or exemption from qualification
of any of the Registrable Securities for sale in any jurisdiction, or the
initiation or threatening of any proceeding for such purpose; and (v) of the
occurrence of any event or passage of time that makes the financial statements
included in a Registration Statement ineligible for inclusion therein or any
statement made in such Registration Statement or Prospectus or any document
incorporated or deemed to be incorporated therein by reference untrue in any
material respect or that requires any revisions to such Registration Statement,
Prospectus or other documents so that, in the case of a Registration Statement,
such Registration Statement will not contain an untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein not misleading, and so that such Prospectus will
not contain an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.

          (f) File documents required of the Company for normal blue sky
clearance in states reasonably specified in writing by the Purchasers prior to
the effectiveness of the Registration Statement; provided, however, that the
Company shall not be required to qualify to do business or consent to service of
process in any jurisdiction in which it is not now so qualified or has not so
consented.

          (g) Use its best efforts to avoid the issuance of, or, if issued,
obtain the withdrawal of (i) any order suspending the effectiveness of a
Registration Statement, or (ii) any suspension of the qualification (or
exemption therefrom) of any of the Registrable Securities for sale in any
jurisdiction, at the earliest practicable moment.

          (h) Cooperate with the Purchasers to facilitate the timely preparation
and delivery of certificates representing Registrable Securities to be delivered
to any transferee pursuant to any

                                      C-2

<PAGE>

Registration Statement free of any restrictive legends and in such denominations
and registered in such names as the Purchasers may reasonably request.

          (i) In the event of any underwritten public offering, enter into and
perform its obligations under an underwriting agreement, in usual and customary
form, with the managing underwriter(s) of such offering. Each Purchaser
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

          (j) In the event of any underwritten public offering, furnish, on the
date that such Registrable Securities are delivered to the underwriters for
sale, if such securities are being sold through underwriters, (i) an opinion,
dated as of such date, of the counsel representing the Company for the purposes
of such registration, in form and substance as is customarily given to
underwriters in an underwritten public offering, addressed to the underwriters,
if any, and (ii) a letter, dated as of such date, from the independent certified
public accountants of the Company, in form and substance as is customarily given
by independent certified public accountants to underwriters in an underwritten
public offering addressed to the underwriters.

          (k) Cause all such Registrable Securities registered pursuant hereto
to be listed on Nasdaq and each other securities exchange on which similar
securities issued by the Company are then listed.

          (l) The Company understands that each of the Purchasers disclaims
being an underwriter, but any Purchasers being deemed an underwriter by the SEC
shall not relieve the Company of any obligations it has hereunder.

     1.2 Transfer of Shares After Registration; Suspension; Damages.

          (a) Each Purchaser, severally and not jointly, agrees (i) that it will
not sell, offer to sell, solicit offers to buy, dispose of, loan, pledge or
grant any right with respect to the Registrable Securities or otherwise take an
action that would constitute a sale within the meaning of the Securities Act,
other than transactions exempt from the registration requirements of the
Securities Act, except as contemplated in the Registration Statement referred to
in Section 1.1 and as described below, (ii) that it shall be a condition
precedent to the obligations of the Company to complete the registration
pursuant to this Agreement with respect to the Registrable Securities of a
particular Purchaser that such Purchaser shall furnish to the Company such
information regarding itself, the Registrable Securities held by it and the
intended method of disposition of the Registrable Securities held by it as shall
be required to effect the registration of such Registrable Securities, (iii)
that it shall execute such documents in connection with such registration, that
are customary for resale registration statements, as the Company may reasonably
request, (iv) to cooperate with the Company as reasonably requested by the
Company in connection with the preparation and filing of any Registration
Statement hereunder, unless such Purchaser has notified the Company in writing
of such Purchaser's election to exclude all of such Purchaser's Registrable
Securities from such Registration Statement and (v) that it will promptly notify
the Company of any changes in the information set forth in the Registration
Statement regarding the Purchaser or its plan of distribution. Any delay of a
Purchaser in taking the actions set forth in clauses (ii), (iii), (iv) and (v)
of this Section 1.2(a) shall be deemed a "Purchaser Delay" for purposes of this
Agreement.

                                      C-3

<PAGE>

          (b) The Company shall: (i) prepare and file from time to time with the
SEC a post-effective amendment to the Registration Statement or a supplement to
the related Prospectus or a supplement or amendment to any document incorporated
therein by reference or file any other required document so that such
Registration Statement will not contain an untrue statement of a material fact
or omit to state a material fact required to be stated therein or necessary to
make the statements therein not misleading, and so that, as thereafter delivered
to purchasers of the Registrable Securities being sold thereunder, such
Prospectus will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading; (ii) provide the Purchaser copies of any documents filed
pursuant to clause (i) of this Section 1.2(b); and (iii) upon request, inform
each Purchaser who so requests that the Company has complied with its
obligations in clause (i) of this Section 1.2(b) (or that, if the Company has
filed a post-effective amendment to the Registration Statement which has not yet
been declared effective, the Company will notify the Purchaser to that effect,
will use its reasonable efforts to secure the effectiveness of such
post-effective amendment as promptly as possible and will promptly notify the
Purchaser pursuant to clause (i) of this Section 1.2(b) when the amendment has
become effective).

          (c) Subject to paragraph (d) below, in the event: (i) of any request
by the SEC or any other federal or state governmental authority during the
period of effectiveness of the Registration Statement for amendments or
supplements to a Registration Statement or related Prospectus or for additional
information; (ii) of the issuance by the SEC or any other federal or state
governmental authority of any stop order suspending the effectiveness of a
Registration Statement or the initiation of any proceedings for that purpose;
(iii) of the receipt by the Company of any notification with respect to the
suspension of the qualification or exemption from qualification of any of the
Registrable Securities for sale in any jurisdiction or the initiation of any
proceeding for such purpose; or (iv) of any event or circumstance which
necessitates the making of any changes in the Registration Statement or
Prospectus, or any document incorporated or deemed to be incorporated therein by
reference, so that, in the case of the Registration Statement, it will not
contain any untrue statement of a material fact or any omission to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and that in the case of the Prospectus, it will not
contain any untrue statement of a material fact or any omission to state a
material fact required to be stated therein or necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading; then the Company shall promptly deliver a certificate in writing to
the Purchaser (the "Suspension Notice") to the effect of the foregoing and, upon
receipt of such Suspension Notice, the Purchaser will refrain from selling any
Registrable Securities pursuant to the Registration Statement (a "Suspension")
until the Purchaser's receipt of copies of a supplemented or amended Prospectus
prepared and filed by the Company, or until it is advised in writing by the
Company that the current Prospectus may be used, and has received copies of any
additional or supplemental filings that are incorporated or deemed incorporated
by reference in any such Prospectus. In the event of any Suspension, the Company
will use its best efforts to cause the use of the Prospectus so suspended to be
resumed as soon as reasonably practicable but in any event within forty-five
(45) days after delivery of a Suspension Notice to Purchasers. In addition to
and without limiting any other remedies (including, without limitation, at law
or at equity) available to the Purchaser, the Purchaser shall be entitled to
specific performance in the event that the Company fails to comply with the
provisions of this Section 1.2(c).

                                      C-4

<PAGE>

          (d) Notwithstanding the foregoing paragraphs of this Section 1.2, the
Purchasers shall not be prohibited from selling Registrable Securities under the
Registration Statement as a result of Suspensions on more than three occasions
of not more than forty-five (45) days each and not more than ninety (90) days in
the aggregate in any twelve month period.

          (e) Provided that a Suspension in accordance with paragraphs (c) and
(d) of this Section 1.2 is not then in effect a Purchaser may sell Registrable
Securities under the Registration Statement, provided that it arranges for
delivery of a current Prospectus to the transferee of such Registrable
Securities. Upon receipt of a request therefor, the Company will provide an
adequate number of current Prospectuses to the Purchaser and to any other
parties requiring such Prospectuses.

          (f) In the event of a sale of Registrable Securities by a Purchaser,
unless such requirement is waived by the Company in writing, such Purchaser
shall deliver to the Company's transfer agent, with a copy to the Company, a
Certificate of Subsequent Sale in form reasonably acceptable to the Company, so
that the shares may be properly transferred.

     1.3 Expenses of Registration. Except as specifically provided herein, all
expenses incurred by the Company in complying with Section 1 hereof, including,
all registration and filing fees, printing expenses, fees and disbursements of
counsel for the Company, reasonable fees and expenses of one counsel to the
Purchasers (which shall be in addition to any fees pursuant to Sections 4.5 and
7), blue sky fees and expenses, fees and the expense of any special audits
incident to or required by any such registration (but excluding the compensation
of regular employees of the Company which shall be paid in any event by the
Company) (collectively, the "Registration Expenses") shall be borne by the
Company. All underwriting discounts and selling commissions applicable to a sale
incurred in connection with any registrations hereunder shall be borne by the
holders of the securities so registered pro rata on the basis of the number of
shares so sold.

     1.4 Delay of Registration; Furnishing Information. The Purchasers shall
furnish to the Company such information regarding themselves, the Registrable
Securities held by them and the intended method of disposition of such
securities as shall be required to effect the registration of their Registrable
Securities. Furthermore, each Purchaser, severally and not jointly, agrees to
promptly notify the Company of any changes in the information set forth in a
registration statement regarding such Purchaser or its plan of distribution set
forth in such registration statement.

     1.5 Indemnification. In the event any Registrable Securities are included
in a registration statement under this Section 1.

          (a) The Company will indemnify and hold harmless each Purchaser, the
partners, officers and directors of each Purchaser, any underwriter (as defined
in the Securities Act) for such Purchaser and each Person, if any, who controls
such Purchaser or underwriter within the meaning of the Securities Act or the
Exchange Act, against any losses, claims, damages, or liabilities (joint or
several) to which they may become subject under the Securities Act, the Exchange
Act or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any of the following
statements, omissions or

                                      C-5

<PAGE>

violations (collectively a "Violation"): (i) any untrue statement or alleged
untrue statement of a material fact contained in a Registration Statement,
including any preliminary prospectus or final prospectus contained therein or
any amendments or supplements thereto, (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein not misleading, or (iii) any violation or alleged
violation by the Company of the Securities Act, the Exchange Act, any state
securities law or any rule or regulation promulgated under the Securities Act,
the Exchange Act or any state securities law in connection with the offering
covered by such registration statement; and the Company will pay as incurred to
each such Purchaser, partner, officer, director, underwriter or controlling
Person for any legal or other expenses reasonably incurred by them in connection
with investigating or defending any such loss, claim, damage, liability or
action; provided, however, that the indemnity agreement contained in this
Section 1.5 shall not apply to amounts paid in settlement of any such loss,
claim, damage, liability or action if such settlement is effected without the
consent of the Company, which consent shall not be unreasonably withheld, unless
such settlement (x) includes an unconditional release of the Company from all
liability on any claims that are the subject matter of such action, and (y) does
not include a statement as to or an admission of fault, culpability or a failure
to act by or on behalf of the Company; provided, further, that the Company shall
not be liable in any such case for any such loss, claim, damage, liability or
action to the extent that it arises out of or is based upon a Violation which
occurs in reliance upon and in conformity with written information furnished
expressly for inclusion in such Registration Statement, prospectus, amendment or
supplement by such Purchaser, partner, officer, director, underwriter or
controlling Person of such Purchaser; provided, further, that this
indemnification agreement will be in addition to any liability which the Company
may otherwise have to the Purchasers.

          (b) Each Purchaser will, if Registrable Securities held by such
Purchaser are included in the securities as to which such Registration
Statement, prospectus, amendment or supplement is being filed, severally and not
jointly, indemnify and hold harmless the Company, each of its directors, its
officers and each Person, if any, who controls the Company within the meaning of
the Securities Act, any underwriter and any other Purchaser selling securities
under such registration statement or any of such other Purchaser's partners,
directors or officers or any Person who controls such Purchaser, against any
losses, claims, damages or liabilities (joint or several) to which the Company
or any such director, officer, controlling Person, underwriter or other such
Purchaser, or partner, director, officer or controlling Person of such other
Purchaser may become subject under the Securities Act, the Exchange Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereto) arise out of or are based upon any Violation, in each case to
the extent (and only to the extent) that such Violation occurs in reliance upon
and in conformity with written information furnished by such Purchaser under an
instrument duly executed by such Purchaser and stated to be specifically for use
in connection with such Registration Statement, prospectus, amendment or
supplement; and each such Purchaser will pay as incurred any legal or other
expenses reasonably incurred by the Company or any such director, officer,
controlling Person, underwriter or other Person registering shares under such
registration, or partner, officer, director or controlling Person of such other
Person registering shares under such Registration Statement in connection with
investigating or defending any such loss, claim, damage, liability or action if
it is judicially determined that there was such a Violation; provided, however,
that the indemnity agreement contained in this Section 1.5 shall not apply to
amounts paid in settlement of any such loss, claim, damage,

                                      C-6

<PAGE>

liability or action if such settlement is effected without the consent of the
Purchaser, which consent shall not be unreasonably withheld, unless such
settlement (x) includes an unconditional release of such Purchaser from all
liability on any claims that are the subject matter of such action, and (y) does
not include a statement as to or an admission of fault, culpability or a failure
to act by or on behalf of such Purchaser; provided, further, that in no event
shall any indemnity under this Section 1.5 exceed the dollar amount of the
proceeds to be received by such Purchaser from the sale of such Purchaser's
Registrable Securities pursuant to the Registration Statement.

          (c) Promptly after receipt by an indemnified party under this Section
1.5 of notice of the commencement of any action (including any governmental
action), such indemnified party will, if a claim in respect thereof is to be
made against any indemnifying party under this Section 1.5, deliver to the
indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the indemnifying party, if representation of such indemnified party by the
counsel retained by the indemnifying party would be inappropriate due to actual
or potential differing interests between such indemnified party and any other
party represented by such counsel in such proceeding. The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action shall not relieve such indemnifying party of any
liability to the indemnified party under this Section 1.5, unless and to the
extent that such failure is materially prejudicial to the indemnifying party's
ability to defend such action, but the omission so to deliver written notice to
the indemnifying party will not relieve it of any liability that it may have to
any indemnified party otherwise than under this Section 1.5.

          (d) If the indemnification provided for in this Section 1.5 is held by
a court of competent jurisdiction to be unavailable to an indemnified party with
respect to any losses, claims, damages or liabilities referred to herein, the
indemnifying party, in lieu of indemnifying such indemnified party thereunder,
shall to the extent permitted by applicable law contribute to the amount paid or
payable by such indemnified party as a result of such loss, claim, damage or
liability (i) in such proportion as is appropriate to reflect the relative
benefits received by the indemnifying party or parties on the one hand and the
indemnified party on the other from the sale of the Registrable Securities
pursuant to the Registration Statement, or (ii) if such allocation is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits but also the relative fault of the indemnifying party
or parties on the one hand and the indemnified party on the other in connection
with the Violation(s) that resulted in such loss, claim, damage or liability, as
well as any other relevant equitable considerations. The relative fault of the
indemnifying party and of the indemnified party shall be determined by a court
of law by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission to state a material fact relates to
information supplied by the indemnifying party or by the indemnified party and
the parties' relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission; provided that in no event
shall any contribution by a Purchaser hereunder exceed the dollar amount of the
proceeds to be received by such Purchaser from the sale of such Purchaser's
Registrable Securities pursuant to the Registration Statement.

                                      C-7

<PAGE>

          (e) The obligations of the Company and the Purchasers under this
Section 1.5 shall survive completion of any offering of Registrable Securities
in a Registration Statement and the termination of this Agreement.

     1.6 Agreement to Furnish Information. In connection with an underwritten
registration in which such Purchaser is participating, each Purchaser agrees to
execute and deliver such other agreements as may be reasonably requested by the
Company or the underwriter. In addition, if requested by the Company or the
representative of the underwriters of Common Stock (or other securities) of the
Company, each Purchaser shall provide such information related to such Purchaser
as may be required by the Company or such representative in connection with the
completion of any public offering of the Company's securities pursuant to a
registration statement filed under the Securities Act.

     1.7 Assignment of Registration Rights. The rights to cause the Company to
register Registrable Securities pursuant to this Section 1 may be assigned (but
only with the related obligations) by a Purchaser, provided (i) each transfer to
each transferee or designee involve either (X) all shares of Offered Securities
held by such Purchaser, (Y) not less than four hundred thousand (400,000) shares
(as adjusted for stock splits, stock dividends, reclassification and the like)
of Common Stock, or (Z) an affiliate, partner or former partner of such
Purchaser, (ii) the Company is, within a reasonable time after such transfer,
furnished with written notice of the name and address of such transferee or
assignee, (iii) such transferee or assignee agrees in writing to assume the
obligations of this Section 1 and (iv) such assignment shall be effective only
if immediately following such transfer the further disposition of such shares by
the transferee or assignee is restricted under the Securities Act.

     1.8 Rule 144 Reporting. With a view to making available to the Purchasers
the benefits of certain rules and regulations of the SEC which may permit the
sale of the Registrable Securities to the public without registration, the
Company agrees to use its best efforts to:

          (a) Make and keep public information available, as those terms are
understood and defined in SEC Rule 144 or any similar or analogous rule
promulgated under the Securities Act;

          (b) File with the SEC, in a timely manner, all reports and other
documents required of the Company under the Exchange Act; and

          (c) So long as a Purchaser owns any Registrable Securities, furnish to
such Purchaser forthwith upon request: a written statement by the Company as to
its compliance with the reporting requirements of said Rule 144 of the
Securities Act, and of the Exchange Act (at any time after it has become subject
to such reporting requirements); a copy of the most recent annual or quarterly
report of the Company; and such other reports and documents as a Purchaser may
reasonably request in availing itself of any rule or regulation of the SEC
allowing it to sell any such securities without registration.

     1.9 S-3 Eligibility. The Company will use its best efforts to (i) file all
reports required to be filed by the Company with the SEC in a timely manner and
(ii) take all other necessary action so as to regain and thereafter maintain
eligibility for the use of Form S-3.

                                      C-8

<PAGE>

     1.10 Termination of Registration Rights. The Company's obligations pursuant
to this Section 1 shall terminate with respect to each Purchaser severally upon
the earlier of (a) the date that any Purchaser has completed the distribution
related to such Purchaser's Registrable Securities, or (b) the second
anniversary of the Closing Date, with respect to any Purchaser who may at such
date sell all of such Purchaser's Registrable Securities under Rule 144(k) (or
any successor rule) under the Securities Act. Following a termination of the
Company's obligations pursuant to the preceding sentence with respect to a
Purchaser, any Offered Securities held by such Purchaser shall not be deemed to
be "Registrable Securities" thereafter, and the obligations of such Purchaser
pursuant to this Section 1 shall also terminate.

     1.11 Amendment of Registration Rights. Provisions of this Section 1 may be
amended and the observance thereof may be waived (either generally or in a
particular instance and either retroactively or prospectively), only with the
written consent of the Company and Purchasers who then hold a majority of the
outstanding Registrable Securities. Any amendment or waiver effected in
accordance with this Section 1.11 shall be binding upon each Purchaser and the
Company. No such amendment shall be effective to the extent that it applies to
less than all of the holders of the Registrable Securities.

                                      C-9<PAGE>

                                                                 Exhibit 10.31.3

                        CONDITIONAL FORBEARANCE AGREEMENT

          THIS CONDITIONAL FORBEARANCE AGREEMENT ("Agreement"), dated as of
April 1, 2003, is made by and between HEARTPORT, INC., a Delaware corporation
("Sublandlord"), and DELTAGEN, INC., a Delaware corporation ("Subtenant").

                                R E C I T A L S:

          A. Sublandlord and Subtenant entered into that certain Sublease
Agreement dated July 10, 2001 (the "Sublease") pursuant to which Sublandlord
leased to Subtenant, and Subtenant leased from Sublandlord, certain premises
(the "Premises") located at 700 Bay Road, Redwood City, California. The Premises
are more particularly described in the Sublease. Capitalized terms used and not
otherwise defined herein shall have the meanings ascribed to said terms in the
Sublease.

          B. Defaults and Events of Default have occurred and are continuing
under the Sublease as a result of Subtenant's failure (i) to make certain
payments of its Proportionate Share of Common Area Expenses, Real Property
Taxes, insurance and other expenses charged to Sublandlord by Master Landlord
under the Master Lease, and (ii) to make the Base Rent payment for March 2003.
As a result of these defaults, Sublandlord may exercise any or all of the rights
and remedies available under the Sublease and applicable law, as Sublandlord, in
its sole and absolute discretion, may determine ("Sublandlord's Rights and
Remedies").

          C. Sublandlord has applied $866,454.84 of the Security Deposit to
reimburse Sublandlord for Subtenant's default described in Recital clause B(i)
above and $374,542.01 to reimburse Sublandlord for Subtenant's default described
in Recital clause B(ii) above. As a result of these applications, Sublandlord
presently holds (i) a cash Security Deposit balance in the amount of $259,003.15
(the "Existing Cash Deposit") and a Letter of Credit Security Deposit in the
amount of $500,000.00 (the "Existing Letter of Credit"). Demand has been made on
Subtenant to restore the Security Deposit to the amounts required under the
Sublease, but Subtenant has failed to do so. Such failure constitutes an
additional Event of Default under the Sublease.

          D. Subtenant has requested that Sublandlord forbear from exercising
Sublandlord's Rights and Remedies commencing on the date of this Agreement
through and including May 30, 2009 (the "Forbearance Period"). Sublandlord has
agreed to Subtenant's request subject to the terms and conditions set forth in
this Agreement.

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

          1. Recitals. Each of the Recitals set forth above are incorporated
into and made a part of this Agreement and are acknowledged by the parties to be
true and correct.

          2. Outstanding Obligations Under the Sublease. As of the date hereof,
there is now due and owing from Subtenant to Sublandlord under the Sublease (a)
the sum of $1,240,996.85, constituting Subtenant's obligation to restore the
Security Deposit following

<PAGE>

Sublandlord's application of (i) $866,454.84 against past due Common Area
Expenses and related charges and (ii) $374,542.01 against the March 2003 Base
Rent, plus (b) attorneys fees and costs incurred by Sublandlord as a result of
Subtenant's breach of the Sublease.

          3. Forbearance by Sublandlord. Subject to Section 4 below, so long as
each and every one of the following conditions is timely satisfied and continues
to be satisfied during the Forbearance Period, Sublandlord agrees to forbear
during the Forbearance Period from exercising any of Sublandlord's Rights and
Remedies:

             (a) Subtenant shall pay to Sublandlord the monthly Base Rent, the
Unpaid Base Rent, and the Unpaid Rent Shortfall (as such terms are defined in
Section 5 below) as and when the same are due pursuant to Section 5 below.

             (b) Subtenant shall replenish and replace the Security Deposit, as
follows:

                 (i)  On or before May 30, 2005, May 30, 2006 and May 30, 2007,
Subtenant shall deliver to Sublandlord a Letter of Credit in the LC Face Amount
of $400,000 each (or amend the initial Letter of Credit provided on May 30, 2005
to reflect an LC Face Amount of $800,000 on May 30, 2006 and $1,200,000 on May
30, 2007). Each such Letter of Credit shall conform and be subject to the
provisions of Section 4 of the Sublease, as amended by this Agreement.

                 (ii) On or before May 30, 2008 and May 30, 2009, Subtenant
shall pay to Sublandlord an amount equal to $400,000 per payment (totaling
$800,000 by May 30, 2009). Such payments shall constitute the cash portion of
the Security Deposit under Section 4 of the Sublease. Subtenant hereby grants to
Sublandlord a security interest in the Security Deposit held by Sublandlord.
Such grant shall survive any termination or expiration of this Agreement.

             (c) Subtenant shall observe and perform each and every obligation
on the part of Subtenant to be observed and performed under the Sublease, as
such obligations may be conditionally modified by this Agreement, and no Event
of Default (other than those specifically identified in Recitals B and C of this
Agreement) shall occur under the Sublease, during the term of the Forbearance
Period under this Agreement.

             (d) During the Forbearance Period, in the event that Subtenant is
no longer required to file periodic reports and financial statements with the
Securities and Exchange Commission, Subtenant shall deliver to Sublandlord, on
or before the date(s) on which such filings would otherwise be due to the
Securities and Exchange Commission if Subtenant were still required to file, its
quarterly balance sheet and the related statements of operations, shareholders'
equity and cash flows (collectively, the "Financial Statements"), and its annual
Financial Statements. Such Financial Statements shall be audited to the extent
that Subtenant otherwise obtains audited Financial Statements in the ordinary
course of its business.

             (e) In the event that Subtenant elects to make any Alteration to
the Sublease Premises either (i) without Master Landlord's consent or (ii) with
Master Landlord's

                                       2

<PAGE>

consent and Master Landlord either requires or reserves the right to require
that Subtenant restore the Sublease Premises to its condition existing
immediately prior to the making of such Alteration, then it shall be a
reasonable condition to Sublandlord's providing its consent (in addition to any
other reasonable conditions that Sublandlord may impose) that Subtenant provide
to Sublandlord (or, at Sublandlord's election, to Master Landlord) a Letter of
Credit in the amount reasonably estimated by Master Landlord to be necessary to
restore the Sublease Premises to its condition existing immediately prior to the
making of such Alteration. Such Letter of Credit shall serve as security for any
obligation on the part of Subtenant to repair and restore the Sublease Premises
to its prior condition as a result of such Alteration. Such Letter of Credit
shall otherwise conform to the Letter of Credit requirements set forth in
Section 4(d) of the Sublease.

             4.  Termination of Forbearance Period. Upon the occurrence of any
one or more of the following events (individually, a "Termination Event"), this
Agreement shall automatically terminate, without notice to any person or entity,
Sublandlord shall no longer be required under this Agreement to forbear from
exercising any of Sublandlord's Rights and Remedies, Sublandlord may immediately
pursue any of Sublandlord's Rights and Remedies with respect to any breach or
Event of Default now or hereafter existing, and Subtenant shall immediately pay
to Sublandlord all Base Rent, additional rent and other sums then due and owing
under the terms of the Sublease, without regard to the provisions of this
Agreement, but reduced by the amount of Base Rent, additional rent and other
payments received by Sublandlord under this Agreement:

                 (a) An Event of Default occurs under the terms of the
Sublease, as conditionally modified by the terms of this Agreement, or a breach
occurs by Subtenant under this Agreement;

                 (b) The total of Subtenant's cash and cash equivalents
(investment securities and other items that can be converted to cash within 30
days, but excluding reserves and sinking funds) does not exceed $500,000 at each
month end for each month prior to December 31, 2003 and $1,500,000 at each month
end for months thereafter;

                 (c) An event of default or breach by Subtenant is declared
under any credit agreement, lease, guaranty or any other obligation to which
Subtenant is a party or by which it is bound where the liability to Subtenant as
a result of such default or breach exceeds $750,000 and such default or breach
is not cured within 30 days from the date on which the default or breach is
declared;

                 (d) Any license, franchise, permit or other authorization
necessary for the manufacture or sale of Subtenant's products (excluding
products which are discontinued by Subtenant in the ordinary course of its
business) is revoked, terminated or suspended as a result of a breach, act or
omission by Subtenant and not reinstated or reissued within 45 days of such
revocation, termination or suspension; provided, however, that any such license,
franchise, permit or other authorization shall not be deemed to be revoked,
terminated or suspended during the period that it remains in effect pursuant to
an injunction obtained by Subtenant within such 45 day period. Sublandlord and
Subtenant agree that Subtenant's license existing on the date of

                                       3

<PAGE>

this Agreement in respect of technologies relating to the use of isogenic DNA
and positive-negative selection is excluded from the scope of this subclause
(d); or

                 (e) Subtenant fails, on or before August 31, 2003, to receive
net additional proceeds of $5,000,000 or more from one or more equity capital
investments in Subtenant.

Subtenant shall give Sublandlord immediate written notice of the occurrence of
any of the foregoing Termination Events, but the provision of such notice shall
not be a condition to or otherwise affect the operation or effect of this
Section 4.

              5. Base Rent During Forbearance Period. Notwithstanding anything
in the Sublease to the contrary, so long as each and every one of the conditions
to forbearance set forth in Section 3 above is timely satisfied and continues to
be satisfied during the Forbearance Period and no Termination Event has
occurred:

                 (a) The monthly Base Rent payable per rentable square foot
under the Sublease shall be as set forth in the following table.

       -------------------------------------------------------------------------
                   Monthly Period                                 Base Rent
                   --------------                             Per R.S.F. Per Mo.
                                                              ------------------

            04/01/03 through 06/30/03                            $2.1244

            07/01/03 through 06/30/04                            $2.1881

            07/01/04 through 06/30/05                            $2.2537

            07/01/05 through 06/30/06                            $2.3213

            07/01/06 through 06/30/07                            $2.3909

            07/01/07 through 06/30/08                            $2.4626

            07/01/08 through 06/30/09                            $2.5365

            07/01/09 through 07/14/10                            $2.6126
       -------------------------------------------------------------------------

                 (b) Notwithstanding Section 5(a) above, Sublandlord and
Subtenant agree that for the period from July 1, 2003 through March 31, 2004,
Subtenant shall be entitled to pay a portion of the monthly Base Rent that is
otherwise due according to the schedule set forth in Section 5(a), in the amount
of $251,000 per month. The excess of the monthly Base Rent over the partial
payment of $251,000 per month is referred to herein as the "Unpaid Base Rent".
On or before May 30, 2005, Subtenant shall pay to Sublandlord $194,485.89,
constituting approximately one-half of the Unpaid Base Rent then due and the
associated late fee. On or before May 30, 2006, Subtenant shall pay to
Sublandlord $180,594.04, constituting the balance of the Unpaid Base Rent and
the associated late fee.

                 (c) Notwithstanding anything to the contrary in the Sublease,
Sublandlord and Subtenant agree that Sublandlord shall use the balance of the
Security Deposit

                                       4

<PAGE>

held by Sublandlord to compensate Sublandlord for the monthly Base Rent due
under the Sublease for the months of April 2003, May 2003 and June 2003, as the
same becomes due and payable. In the event that the Security Deposit is
insufficient to satisfy fully Subtenant's obligations for Base Rent for the
foregoing months, the unpaid balance (the "Unpaid Rent Shortfall") shall be paid
by Subtenant to Sublandlord in two equal installments, with the first payment to
be made on May 30, 2005 and the second payment to be made on May 30, 2006. Such
payments shall be accompanied by a late fee in the amount of $48,711.47 on May
30, 2005 and $43,924.78 on May 30, 2006.

                 (d) Notwithstanding Section 5(a) above, in the event that
Subtenant has filed against it one or more lawsuits (i) which is/are not based
primarily on employment or breach of written contract related causes of action,
(ii) which claim individually or in the aggregate monetary damages in excess of
the greater of (1) Subtenant's then cash balance or (2) $1,500,000, (iii) for
which insurance proceeds available to Subtenant are insufficient to pay such
damages in full, and (iv) which is/are not dismissed with prejudice within 60
days from the date of filing, then the monthly Base Rent shall revert to the
monthly Base Rent amount set forth in the Sublease effective on the 61st day
following the filing of such lawsuit (or, if more than one lawsuit is filed,
following the filing of the first such lawsuit). The monthly Base Rent shall
continue at the rates set forth in the Sublease (including any periodic
adjustments set forth therein) for the balance of the Sublease term except as
provided in the following sentence. In the event that the lawsuit(s) is/are
resolved, by written settlement agreement or final, non-appealable judgment, and
the terms of such resolution would not cause a Termination Event to occur
(whether or not Subtenant has performed the terms of the resolution), then the
monthly Base Rent during the pendency of the litigation shall be recomputed at
the rates set forth in Section 5(a) above and any Base Rent paid by Subtenant to
Sublandlord over and above the rates set forth in Section 5(a) for such period
shall be credited, without interest, against the monthly Base Rent thereafter
due and payable by Subtenant or, at Sublandlord's option, against any remaining
balance due from Subtenant for the Security Deposit pursuant to Section 3(b)(ii)
above.

              6. Amendment of Sublease upon Expiration of Forbearance Period.
Unless this Agreement and the Forbearance Period is terminated earlier pursuant
to Section 4 above, upon expiration of the Forbearance Period, the Forbearance
Period shall automatically terminate and the Sublease shall be deemed to have
been amended as follows effective as of the expiration of the Forbearance
Period:

                 (a) The monthly Base Rent per rentable square foot under the
Sublease for periods from and after the expiration of the Forbearance Period
shall be as set forth in the table set forth in Section 5(a) above, except as
provided in Section 5(d) above;

                 (b) The cash portion of the Security Deposit shall be $800,000
and the Letter of Credit portion of the Security Deposit shall be $1,200,000.

                 (c) Section 4(e) of the Sublease shall be deleted in its
entirety.

                 (d) The reference to "October 15" in the second line Section
3(b) of the Sublease shall be deemed a reference to "July 1".

                                       5

<PAGE>

                   (e) Except as set forth in this Section 6, all of the terms
and provisions of the Sublease shall remain unmodified and in full force and
effect.

               7.  Condition Precedent. Notwithstanding anything in this
Agreement to the contrary, it is an express condition precedent to the
effectiveness of this Agreement and the parties' respective obligations
hereunder that Subtenant shall have irrevocably received, on or before April 2,
2003, proceeds from a bridge loan financing in an amount not less than
$4,000,000. If such proceeds are not received by such date, then this Agreement
shall be null and void ab initio.

               8.  Waivers. No waiver of any provision of this Agreement or of
any breach by a party under this Agreement shall be effective unless such waiver
is expressly set forth in a writing signed by the party against whom enforcement
of the waiver is sought. Such waiver shall be operative only for the time and to
the extent therein stated. The waiver by either party hereto of any provision of
this Agreement or of any breach of any term, covenant or condition herein
contained shall not be deemed to be a waiver of any other provision or of any
other or subsequent breach of the same or any other term, covenant or condition
herein contained. The subsequent acceptance of rent or other payments due
hereunder by Sublandlord shall not be deemed to be a waiver of any preceding
breach by Subtenant of any term, covenant or condition of this Agreement, other
than the failure of Subtenant to pay the particular rent or other payment so
accepted, regardless of Sublandlord's knowledge of such preceding breach at the
time of acceptance. No acceptance of a lesser amount than the rent or other
payments herein stipulated shall be deemed a waiver of Sublandlord's right to
receive the full amount due, nor shall any endorsement or statement on any check
or payment or any letter accompanying such check or payment be deemed an accord
and satisfaction. Sublandlord may accept such check or payment without prejudice
to Sublandlord's right to recover the full amount due.

               9.  Attorneys' Fees. In the event of any litigation between any
of the parties hereto arising out of the obligations of such party or parties
under this Agreement, the losing party shall pay the prevailing party's costs
and expenses of such litigation, including without limitation reasonable
attorneys' fees.

               10. Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of California.

               11. Multiple Counterparts; Facsimile Signatures. This Agreement
may be executed in any number of counterparts, each of which when so executed
shall be deemed an original, but all of which when taken together shall
constitute one and the same instrument. A facsimile signature of a party shall
be effective as an original. Any party who executes this Agreement by facsimile
signature shall cause the original signed counterpart to be delivered to the
other party via overnight delivery.

               12. Interpretation. The parties hereto have been represented by
counsel in the preparation and negotiation of this Agreement. Accordingly, this
Agreement shall be construed according to its fair language and any ambiguities
shall not be resolved against the drafting party.

                                       6

<PAGE>

               13. Further Assurances. The parties hereto agree to execute any
document, agreement, instrument or financing statement or take such further
actions as may be reasonably required by any other party hereto in order to
effectuate the terms of this Agreement.

               14. Miscellaneous. The title(s) of this Agreement and the subject
headings or captions to any paragraphs or provisions hereof are for reference
only and are not a part of this Agreement. Any references to the singular shall
include the plural (and vice versa) and any references to the male gender shall
include the female gender (and vice versa).

               15. Severability. If any provision of this Agreement shall prove
to be invalid or unenforceable, such provision shall be deemed modified to the
minimum extent necessary to render it valid and enforceable, and if not
susceptible to such modification, such provision shall be stricken from this
Agreement. In no event shall any such provision affect, impair or invalidate any
other provision of this Agreement, and such other provisions shall remain in
full force and effect.

               16. Entire Agreement; Amendments. This Agreement constitutes the
entire agreement between the parties regarding the matters covered hereby, and
supersedes all prior discussions, negotiations, memoranda and understandings
concerning the same. This Agreement may not be supplemented, modified, or
amended except by an agreement in writing signed by the parties hereto or their
respective successors in interest.

               17. Assignment Prohibited. This Agreement has been entered into
by Sublandlord as an accommodation to Subtenant in reliance on representations
and warranties by Subtenant concerning its financial condition. As such, this
Agreement is for the sole, personal benefit of Subtenant and may not be assigned
or transferred by Subtenant, either directly, indirectly, by operation of law or
otherwise (herein, a "Transfer"), without the express, prior written consent of
Sublandlord, which consent Sublandlord may grant or withhold in its sole and
absolute discretion. Any Transfer or attempted Transfer by Subtenant shall be
void, shall confer no rights upon any third person and shall, at the option of
Sublandlord, constitute a Termination Event. If any Transfer is now or hereafter
required to be permitted by law notwithstanding the foregoing restriction, or if
Sublandlord shall, in its discretion, consent to a particular Transfer, such
event shall not constitute consent to any subsequent Transfer, nor shall such
Transfer release Subtenant from the full performance by Subtenant of all
provisions, conditions and covenants of this Agreement.

               18. Notices. Any notices required or permitted to be given under
this Agreement shall be given in accordance with the notice provisions set forth
in the Sublease.

                         [Signature Page is Next Page.]

                                       7

<PAGE>

               IN WITNESS WHEREOF, the parties have executed this Agreement as
of the day and year written above.

"SUBLANDLORD":                               HEARTPORT, INC.,
                                             a Delaware corporation

                                             By:    ____________________________
                                             Name:  ____________________________
                                             Title: ____________________________

"SUBTENANT":                                 DELTAGEN, INC.,
                                             a Delaware corporation

                                             By:    ____________________________
                                             Name:  Richard H. Hawkins
                                             Title: Chief Financial Officer

                                       8

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