Document:

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                                                                   EXHIBIT 10.40

                               THREE SISTERS RANCH
                            E N T E R P R I S E S LLC

                                FOURTH AMENDMENT

     THIS FOURTH AMENDMENT TO LEASE ("AMENDMENT") is made and entered into
effective as of June l, 2002("EFFECTIVE DATE"), by and between THREE SISTERS
RANCH ENTERPRISES, LLC, a California limited liability company ("LANDLORD"), and
CONCEPTUS, INC, a California corporation ("TENANT"):

     This Fourth Lease Addendum is attached to and forms a part of the Lease
identified below together with any amendments, modifications and exhibits,
including a prior Lease Addendum and a prior Lease Addendum and Partial Lease
Termination Agreement. This Fourth Lease Addendum constitutes additional
covenants and agreements which are intended to prevail in the event of any
conflict between the covenants and agreements contained in this Fourth Lease
Addendum and those contained in the Lease itself and/or the Lease Addenda.
Except for the additions, changes and removals listed herein, all other terms
and conditions of the Lease will remain in full force and effect throughout the
term of the Lease.

                                    RECITALS

     A. On or about April 15, 1997, Landlord and Tenant entered into a lease
("LEASE"), attached hereto as EXHIBIT A (the Lease and this Amendment may
hereinafter be sometimes referred to in the aggregate as the "LEASE"), for the
certain premises owned by Landlord, and thereafter executed a Lease Addendum and
A Lease Addendum and Partial Termination Agreement. Tenant current leases 16,397
square feet of 957 Industrial Road, Suites D, F, G, H, J, L, P and R, San
Carlos, California 94070 (together, the "Premises"), that are all part of a
building complex more commonly known as the San Carlos Business Park.

     B. Tenant has notified Landlord that Tenant intends to extend their lease
that expires May 31, 2002 and relocate into the space noted in recital A above.

     C. The former sublease between Conceptus, Inc. (SubLessor) and AvioDigital,
Inc. (SubLessee) also expires May 31, 2002.

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                              TERMS AND CONDITIONS

         THEREFORE, IT IS HEREBY MUTUALLY AGREED by and between the Parties
hereto as follows:

     1. During the remaining Term of the Lease, for so long as Tenant is not in
        material default under any of the provisions of the Lease shall be
        amended to read as follows:

     2  The term of this Lease Extension shall commence June 1, 2002 and expire
        December 31, 2003.

     3. Base Rent shall be $1.55 per square foot per month NNN for the extended
        lease term  ($25,415.35/  month). Reimbursable  C.A.M.  charges are
        estimated  at $0.2378 per square foot per month (  $3,900.00/ month) for
        2002.

     The provisions of this Amendment shall control if in conflict with any of
the provisions of the body of the Lease or any exhibits or other attachments to
the Lease.

     Except as expressly provided in this Fourth Amendment, the Parties hereby
reaffirm the Lease and each provision thereof, in its entirety, and Tenant
affirms that neither Landlord nor, to the best of Tenant's knowledge, Tenant is
in breach or default of any of their respective obligations under the Lease.

     This Amendment may be executed in counterparts.

     IN WITNESS HEREOF, the Parties have executed this Fourth Lease Amendment as
of the date first set forth below.

LANDLORD:                                  TENANT:
--------                                   ------
THREE SISTERS RANCH                        CONCEPTUS, INC
ENTERPRISES, LLC, a California             a California Corporation
Limited Liability Company

By:   /s/ Martin E. Ruberry                By:   /s/ Glen Furuta
   ----------------------------------         ----------------------------------
           Martin E. Ruberry                         Glen Furuta, CFO
           Its:      President/CEO

Date: 1/17/02                              Date: 1/22/02
                                                --------------------------------

                                           By:   /s/ William Dippel
                                              ----------------------------------
                                              William Dippel,
                                              VP of Operations

                                           Date: 1/22/02
                                                --------------------------------

                                    EXHIBIT A
                      [ATTACH COPY OF THE LEASE AGREEMENT]<PAGE>
                                                                   EXHIBIT 10.24

             AMENDED AND PARTIALLY RESTATED COLLABORATION AGREEMENT
                                     BETWEEN

                            ACLARA BIOSCIENCES, INC.
                                       AND

                               PE CORPORATION (NY)

Confidential treatment has been requested for portions of this exhibit. The copy
filed herewith omits the information Subject to the confidentiality request.
Omissions are designated as [*]. A complete version of this Exhibit has been
filed separately with the Securities and Exchange Commission.

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                  AMENDED AND RESTATED COLLABORATION AGREEMENT

     THIS AMENDED AND RESTATED COLLABORATION AGREEMENT (this "AMENDED GA
AGREEMENT") is signed as of March 22, 2002 ("AMENDMENT SIGNING DATE") and
effective as of May 17, 2001 ("AMENDMENT EFFECTIVE DATE"), by and between ACLARA
BIOSCIENCES, INC., a Delaware corporation having its principal place of business
at 1288 Pear Avenue, Mountain View, California 94043 ("ACLARA"), and PE
CORPORATION (NY), a New York corporation, through its Applied Biosystems Group,
having its principal place of business at 850 Lincoln Center Drive, Foster City,
California 94404 ("ABG"). ACLARA and ABG may be referred to herein individually
as a "Party" or, collectively, as "Parties."

                                    RECITALS

     WHEREAS, ABG (as the successor-in-interest to The Perkin-Elmer Corporation)
and ACLARA (as the successor-in-interest to Soane Biosciences, Inc.) entered a
Collaboration Agreement, dated April 25, 1998 (the "GA AGREEMENT"), related to
the development of genetic analysis systems incorporating microfluidic
electrophoresis devices; and

     WHEREAS, ABG and ACLARA each desire to be able to (i) independently develop
products pursuant to the terms of this Amended GA Agreement that, if developed
pursuant to the terms of the GA Agreement, would be Licensed Product, and (ii)

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jointly  develop  products as Licensed  Product  pursuant to the terms of the GA
Agreement if the Parties agree to do so as provided herein; and

     WHEREAS, the GA Agreement incorporates certain provisions, including,
without limitation, provisions relating to the Parties' wish to amend and
restate as set forth below

     Now, THEREFORE, in consideration of the foregoing premises and the promises
and undertakings set forth herein, the Parties agree as follows:

                                    ARTICLE 1

                                   DEFINITIONS

     Except as otherwise set forth below, terms with initial capitals shall be
defined as set forth in the GA Agreement.

     1.1 "JOINT  DEVELOPMENT  PROPOSAL" shall have the meaning assigned to it in
Section 3.1.

     1.2 "POST EXCLUSIVE PERIOD PRODUCT" means any product developed in
accordance with the terms of this Amended GA Agreement that, if developed in
accordance with the terms of the GA Agreement without amendment and restatement
as provided herein, would be Licensed Product.

     1.3 "PRODUCT NET SALES" means (i) with respect to sales by a Party, or an
Affiliate of a Party, or a distributor of a Party to non-affiliated third party
purchasers, the actual amount of gross sales of Post Exclusive Period Product to
a third party, less: trade, cash and quantity discounts granted at the time of
invoice, if any, actually allowed, amounts refunded for faulty or

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defective product, returns, rejections, freight, insurance and other
transportation costs (except income taxes), tariffs, duties and similar
governmental charges paid, to the extent included in gross sales price, (ii)
with respect to sales by a Party made to any Affiliate or to any person, firm or
corporation enjoying a special course of dealing with a Party, the Product Net
Sales will be determined based on the first resale in a bona fide arms-length
transaction of Post Exclusive Period Product by such Affiliate, person, firm or
corporation to third parties, and (iii) with respect to Post Exclusive Period
Product which are used by a Party, or an Affiliate of a Party, to supply
services or information to a third party for commercial purposes, or are
otherwise disposed of, the Product Net Sales shall be determined as if such Post
Exclusive Period Product had been sold at the average Product Net Sales for such
Post Exclusive Period Product during the past one hundred and twenty days.

                                    ARTICLE 2

                                THE GA AGREEMENT

     2.1 PARTIES. ACLARA agrees to assume the rights and obligations of SBio
under the GA Agreement. ABG agrees to assume the rights and obligations of
Perkin-Elmer under the GA Agreement.

     2.2 PURPOSE OF AMENDMENT. Notwithstanding the terms and conditions of the
GA Agreement, subject to the terms and conditions provided herein, ABG and
ACLARA each hereby agree that each Party may independently develop Post
Exclusive Period Product. In addition, notwithstanding the previous sentence,
ABG and ACLARA each hereby agree that the Parties may jointly develop Licensed
Product pursuant to the terms of the GA Agreement; PROVIDED that the Parties
agree to do so in accordance with the requirements of Article 3 of this Amended
GA Agreement prior to initiation of such joint development.

     2.3 PROVISIONS NO LONGER EFFECTIVE. ABG and ACLARA each hereby agree that,
upon the Amendment Effective Date, the following sections of the GA Agreement
are no longer in force or effect, except to the extent that the Parties may, in
their discretion, mutually agree in writing, pursuant to Article 3, to jointly
develop a Licensed Product: Sections 2, 3, 4, 5.2, 5.4, 5.5.1, and 10. ABG and
ACLARA each hereby agree that all provisions of the GA Agreement, except as set
forth in this Section 2.3, shall remain in full force and effect.

     2.4 INTELLECTUAL PROPERTY. ABG and ACLARA each hereby agree that, unless
the Parties agree to jointly develop a Licensed Product pursuant to Article 3,
Collaboration SBio Intellectual Property, Collaboration Joint Intellectual
Property, and Collaboration Perkin-Elmer Intellectual Property shall be limited
to Intellectual Property Rights that were conceived and reduced to practice as a
result of work performed under the GA Agreement before the Amendment Effective
Date. In the event that the Parties agree to jointly develop a Licensed Product
pursuant to Article 3, Collaboration SBio Intellectual Property, Collaboration
Joint Intellectual Property, and Collaboration Perkin-Elmer Intellectual
Property shall include additional Intellectual Property Rights that are
conceived and reduced to practice as a result of the work thereafter performed
to jointly develop such Licensed Product.

                                        3

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     2.5 Release. ABG and ACLARA each hereby release the other Party from any
and all obligations or liabilities arising from Sections 2, 3 or 4 of the GA
Agreement prior to the Amendment Effective Date.

     2.6 INTERPRETATION OF AMENDED GA AGREEMENT. In the event of any conflict,
inconsistency, or incongruity between any provision of this Amended GA Agreement
and any provision of the original GA Agreement, the provisions of this Amended
GA Agreement will govern and control.

                                    ARTICLE 3

                            JOINT DEVELOPMENT OPTION

     3.1 PROPOSAL FOR JOINT DEVELOPMENT UNDER GA AGREEMENT. If ABG desires to
develop any Post Exclusive Period Product, ABG first shall notify ACLARA in
writing, which notice shall include, without limitation, a description of the
proposed Post Exclusive Period Product ("Proposed Product") and a development
and commercialization plan with respect thereto (a "JOINT DEVELOPMENT
PROPOSAL").

     3.2 JOINT DEVELOPMENT PLAN. If ABG submits a Joint Development Proposal to
ACLARA as provided in Section 3.1 above, ACLARA will either notify ABG in
writing within 15 days of Aclara's receipt of such submission that it does not
desire to pursue the Joint Development Proposal or within 30 days of such
submission, both Parties will meet in person to discuss in good faith such Joint
Development Proposal. If ACLARA agrees to pursue such joint development for the
Proposed Product, within 45 days of such meeting with ABG, ACLARA shall notify
ABG in writing and, within 30 days of ABG's receipt of such written notice to
ABG, the Parties shall draft a detailed joint development plan ("JOINT
DEVELOPMENT PLAN"), which shall include, without limitation, a detailed
description of the Proposed Product, the specific steps each Party shall take to
reach the Start Development Checkpoint for such Proposed Product, a schedule for
completing such steps, and a detailed commercialization plan for such Proposed
Product. If ACLARA notifies ABG within said 15 day period that it does not wish
to pursue the Joint Development Proposal or after the meeting ACLARA does not
agree to pursue such joint development, ACLARA shall notify ABG in writing (or,
if ACLARA fails to provide ABG with a written response within the 45-day
decision period as to whether or not it desires to pursue such joint development
with ABG), then such Proposed Product shall be deemed a Post Exclusive Period
Product subject to the nonexclusive license terms set forth in Articles 4 and 5
below.

     3.3 CONFIRMATION OF JOINT DEVELOPMENT. If the Parties agree in writing as
provided at Section 3.2 above to proceed with a Joint Development Plan for a
Proposed Product, then it is agreed that: (i) the Parties' rights and
obligations, solely with respect to the Proposed Product described in the Joint
Development Plan, shall be as set forth in the GA Agreement; and (ii) the
Parties shall execute a written confirmation of joint development in a form set
forth in Exhibit A (a "CONFIRMATION OF JOINT DEVELOPMENT"), which shall include,
as an exhibit thereto, a copy of

                                        4

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the mutually agreed Joint Development Plan; and (iii) upon such written
confirmation, such Proposed Product shall not be deemed a Post Exclusive Period
Product as provided herein.

     3.4 TERMS OF GA AGREEMENT. ABG and ACLARA each agree that, upon the
execution of a Confirmation of Joint Development, and solely with respect to the
Proposed Product and development activities set forth in the Joint Development
Proposal attached to such Confirmation of Joint Development: (i) such Proposed
Product shall be deemed a Licensed Product that is subject to the entire GA
Agreement, including, without limitation, Sections 2, 3, 4, 5.2, 5.4, and 5.5.1
shall be deemed, at that time, to be reinstated and in full force and effect
solely with respect thereto; and (ii) Article 4 of this Amended GA Agreement
shall no longer apply with respect to, and solely with respect to, such Proposed
Product that is the subject of a Confirmation of Joint Development. For
avoidance of doubt, with respect to any Proposed Product that is the subject of
a Confirmation of Joint Development, the exclusivity provisions of the GA
Agreement, including, without limitation, the exclusive license grants therein,
shall apply and the nonexclusive license grants set forth in Section 4.2 of this
Amended GA Agreement below shall not apply.

                                    ARTICLE 4

                             INDEPENDENT DEVELOPMENT

     4.1 NO DILIGENCE.  Neither ABG nor ACLARA shall have any obligation,  as of
the Amendment  Effective Date and thereafter,  to develop or  commercialize  any
Licensed Product.

     4.2 ACLARA'S LICENSE OF INTELLECTUAL PROPERTY TO ABG.

          (a) LICENSE GRANT. In the event that ABG provides notice to ACLARA in
     accordance with Section 3.1 and ACLARA notifies ABG pursuant to Section 3.2
     that it does not agree to pursue joint development of a Proposed Product
     described in ABG's Joint Development Proposal (or fails to respond to ABG
     within the 45-day decision period), such Proposed Product shall be deemed a
     Post Exclusive Period Product; and, subject to the exclusion set forth in
     Section 4.2(b), ACLARA hereby grants to ABG a worldwide, royalty-bearing,
     non-exclusive license, [ * ], under the Valid Claims of Licensed Patents
     which claim Pre-Collaboration SBio Intellectual Property or Collaboration
     SBio Intellectual Property to make, have made by an Approved Third Party,
     offer to sell, sell, import and use such Post Exclusive Period Product in
     the Licensed Field, wherein"Approved Third Party" means a third party other
     than Caliper Technologies, Inc. or its Affiliate that has been approved by
     ACLARA as follows: ABG shall notify ACLARA in writing of the name of the
     proposed third party; ACLARA shall respond in writing within 30 days after
     receiving such notification whether or not it approves the third party,
     which approval shall not be unreasonably withheld; and if ACLARA does not
     approve the third party, it shall include in its response its good faith
     reasons to believe that approval of the third party would have an
     unreasonable negative impact on the business of ACLARA or its Affiliates or
     sublicensees.

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

[*] Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.

                                        5

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          (b) JAPANESE EXCLUSION.  The non-exclusive  license granted in Section
     4.2(a) expressly  excludes the  manufacture,  use or sale of Post Exclusive
     Period Product having [ * ] in Japan.

     4.3 ABG'S OPTION TO LICENSE INTELLECTUAL PROPERTY TO ACLARA. ABG hereby
grants to ACLARA an option to negotiate in good faith for a royalty-bearing,
worldwide, nonexclusive, non-transferable, [ * ], license under one or more
patents included within Collaboration Perkin-Elmer Intellectual Property to
make, have made, import, use, offer to sell, and sell Post Exclusive Period
Product in the Licensed Field

     4.4 Payments by ABG. ABG shall pay ACLARA a royalty, as set forth below, on
Net Sales of Post Exclusive Period Product:

          (a) GENETIC  ANALYSIS  SYSTEMS.  [ * ] Product Net Sales  generated by
     Genetic  Analysis Systems covered by Valid Claims of Licensed Patents which
     claim  Pre-Collaboration  SBio Intellectual  Property or Collaboration SBio
     Intellectual Property.

          (b) MICROFLUIDIC ELECTROPHORESIS DEVICES. (i) [ * ] Product Net Sales
     generated by Microfluidic Electrophoresis Devices covered by Valid Claims
     of Licensed Patents which claim Pre-Collaboration SBio Intellectual
     Property, or (ii) [ * ] Microfluidic Electrophoresis Devices covered by
     Valid Claims of Licensed Patents which claim Collaboration SBio
     Intellectual Property, provided that to the extent that a Microfluidic
     Electrophoresis Devices are also covered by Valid Claims of Licensed
     Patents which claim Pre-Collaboration SBio Intellectual Property, [ * ]
     that applies to Product Net Sales thereof.

                                    ARTICLE 5

                               PAYMENT PROVISIONS

     5.1 PAYMENT SCHEDULE. The Party owing any amount pursuant to Sections 4.4
or 4.5 shall make payment to the other Party on a quarterly basis within thirty
(30) days after the last day of each calendar period in which the Product Net
Sales occurred. The Party making payment shall provide the other Party, with
each such payment, a written report setting forth in reasonable detail the
calculation of the amounts due.

     5.2 MODE OF PAYMENT. All payments hereunder will be made by direct wire
transfer of United States Dollars in the requisite amount to such bank account
as the receiving Party may from time to time designate by written notice to the
other Party. Payments will be free and clear of any taxes (other than
withholding and other taxes. imposed on the payee), fees or charges, to the
extent applicable.

     5.3 RECORDS RETENTION. For a period of three (3) years after the date of
each report provided to a Party pursuant to Section 5.1, the Party making the
payment shall keep records of such Product Net Sales in sufficient detail to
confirm the accuracy of any royalty payment

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

[*] Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.

                                        6

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calculations   hereunder.   Such  records  shall  be  deemed  the   Confidential
Information of each Party.

     5.4 AUDITS.

          (a) AUDIT RIGHTS; PROCEDURE. Upon the written request of the Party
     receiving payment, and not more than once in each calendar year, the Party
     making payment will permit an independent certified public accounting firm
     selected by other Party, and reasonably acceptable to the paying Party, at
     the expense of the Party initiating the audit, to have access during normal
     business hours, and upon reasonable prior written notice, to such of the
     records of the paying Party as may be reasonably necessary to verify the
     accuracy of the payments due within the preceding three (3) years.

          (b) ADDITIONAL PAYMENTS; COST REIMBURSEMENT. If such accounting firm
     concludes that additional royalties or other payments were owed during such
     period, the paying Party will pay the additional royalties or other
     payments, with interest from the date originally due at the prime rate, as
     published in The Wall Street Journal (Eastern U.S. Edition) on the last
     business day preceding such date, within thirty (30) days after the date
     the auditing Party delivers to the other Party such accounting firm's
     written report. If the amount of the underpayment is greater than five
     percent (5%) of the total amount owed, then the paying Party shall
     reimburse the other Party for its reasonable costs related to such audit.

          (c) CONFIDENTIALITY. The independent, certified public accountant
     shall be required to maintain all information it reviews in confidence,
     except that it may report the results of its audit to the Party that
     initiated such audit. The Party receiving the audit report shall treat all
     information subject to review under this Section 5.4 in accordance with the
     confidentiality provisions of the GA Agreement, and will cause its
     accounting firm to enter into a confidentiality agreement reasonably
     acceptable in form and substance to the Party being audited, obligating
     such firm to retain all such financial information in confidence pursuant
     to such confidentiality agreement.

          (d) AUDIT DISPUTES. If the Party that was audited in good faith
     disputes the conclusion of the accounting firm under subsection (b) above
     that the audited Party owes additional royalties or other payments, or any
     specific aspect of the conclusion, then such Party will inform the other
     Party by written notice within sixty (60) days of receiving a copy of the
     audit containing such conclusion, specifying in detail the reasons for
     disputing such conclusion. The Parties will promptly thereafter meet and
     negotiate in good faith a resolution to such dispute. In the event that the
     Parties are unable to resolve such dispute within sixty (60) days after
     such notice, the matter will be resolved pursuant to the terms of the GA
     Agreement, and interest will be payable on any additional royalties or
     other payments determined to be due in the same manner as provided for in
     Section 5.4(b).

                                    ARTICLE 6

                                     GENERAL

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     6.1 NOTICES. Section 11.7 of the GA Agreement is hereby deleted in its
entirety and replaced by the following:

          11.7 NOTICES. Any notice, request, delivery, approval or consent
     required or permitted to be given under this Agreement will be in writing
     and will be deemed to have been sufficiently given if delivered in person,
     or by express courier service (signature required) or five (5) days after
     it was sent by registered letter, return receipt requested (or its
     equivalent), to the Party to which it is directed at its address or such
     other address as such Party will have last given by notice to the other
     Parties.

     If to ACLARA, addressed to:

          ACLARA BioSciences, Inc.
          1288 Pear Avenue
          Mountain View, California 94043
          Attn.: Chief Executive Officer
          Fax: (650) 210-1210

and to

          Latham & Watkins
          135 Commonwealth Drive
          Menlo Park, CA 94025
          Attn.: Michael W. Hall, Esq.
          Fax: (650) 4632600

If to ABG, addressed to:

          Applied Biosystems
          850 Lincoln Center Drive
          Foster City, California 94043

          Attn.: Vice President, Intellectual Property
          Fax: (650) 638-6677

     6.2 COUNTERPARTS. This Amended Agreement may be executed simultaneously in
any number of counterparts, any one of which need not contain the signature of
more than one Party but all such counterparts taken together will constitute one
and the same agreement.

     IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed
by their respective duly authorized officers as of the Effective Date, each copy
of which will for all purposes be deemed to be an original.

ACLARA BIOSCIENCES, INC.                  PE CORPORATION (NY)

By: /s/ Joseph M. Limber                 By: /s/ Michael W. Hunkapiller
   -----------------------------             -------------------------------

Name: Joseph M. Limber                   Name: Michael W. Hunkapiller
     ---------------------------              ------------------------------

Title: President, CEO                    Title: Sr. V.P.
      --------------------------               -----------------------------

Date: March 25, 2002                     Date: March 22, 2002
     ---------------------------              ------------------------------

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<PAGE>

                                    EXHIBIT A

                        CONFIRMATION OF JOINT DEVELOPMENT

     THIS CONFIRMATION OF JOINT DEVELOPMENT (this "CONFIRMATION") is entered
into and effective as of , 20- (the "EFFECTIVE DATE"), by and between ACLARA
BIOSCIENCES, INC., a Delaware corporation having its principal place of business
at 1288 Pear Avenue, Mountain View, California 94043 ("ACLARA"), and PE
CORPORATION (NY), a New York corporation, through its Applied Biosystems group,
having its principal place of business at 850 Lincoln Center Drive, Foster City,
California 94404 ("ABG"). ACLARA and ABG may be referred to herein individually
as a "Party" or, collectively, as "Parties."

                                    RECITALS

     WHEREAS, ABG (as the successor-in-interest to The Perkin-Elmer Corporation)
and ACLARA (as the successor-in-interest to Soane Biosciences, Inc.) entered a
Collaboration Agreement, dated April 25, 1998 (the "GA AGREEMENT"), related to
the development of genetic analysis systems incorporating microfluidic
electrophoresis devices; and

     WHEREAS, ABG and ACLARA entered into a Amended and Restated Collaboration
Agreement, dated March 22, 2002 (the "AMENDED GA Agreement") and effective May
17, 2001, which provided, in part, that the Parties may (i) independently
develop products pursuant to the terms of the Amended GA Agreement that, if
developed pursuant to the terms of the GA Agreement, would be Licensed Product,
and (ii) jointly develop products as Licensed Product pursuant to the terms of
the GA Agreement if the Parties agree to do so as provided the Amended GA
Agreement; and

     WHEREAS, the Parties wish to confirm that they agree to the joint
development of a certain Licensed Product, as set forth herein.

     Now, THEREFORE, in consideration of the foregoing premises and the promises
and undertakings set forth herein, the Parties agree as follows:

1. The Parties hereby agree that the terms and conditions of the GA Agreement
shall apply to the Licensed Product, and the development thereof, as set forth
in the Joint Development Plan, attached hereto as Exhibit 1.

ACLARA BIOSCIENCES, INC.                  PE CORPORATION (NY)

By:_____________________________          By:_______________________________

Name:___________________________         Name:______________________________

Title:__________________________         Title:_____________________________

Date:___________________________          Date:______________________________

                                        9

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