Exhibit 10.34



                              AMENDMENT NUMBER ONE

                                      DATED



                                November 30, 2000

                                     To the

                                LICENSE AGREEMENT

                                      DATED

                                  July 21, 2000

                                     BETWEEN



                         TAISHO PHARMACEUTICAL CO., LTD.





                                       AND





                          NEUROCRINE BIOSCIENCES, INC.








                  AMENDMENT NUMBER ONE TO THE LICENSE AGREEMENT



AMENDMENT NUMBER ONE (this  "Amendment")  dated November 30, 2000 to the LICENSE
AGREEMENT  (the "License  Agreement")  dated July 21, 2000 by and between Taisho
Pharmaceutical  Co., Ltd., a Corporation  organized under the laws of Japan with
principal offices located at 24-1, Takata 3-Chome,  Toshima-ku,  Tokyo 170-8633,
Japan ("Taisho") and Neurocrine  Biosciences,  Inc., a Delaware Corporation with
principal  offices located at 10555 Science Center Drive, San Diego,  California
92121 ("Neurocrine").

                                   WITNESSETH:

           WHEREAS,  Taisho and  Neurocrine  entered into the License  Agreement
pursuant to which Neurocrine licensed to Taisho exclusive rights to Neurocrine's
proprietary altered peptide ligand,  NBI-6024,  in the Field of Use in Asian and
European countries (each as defined in the License Agreement).

           WHEREAS,  Taisho  and  Neurocrine  now  wish  to  amend  the  License
Agreement  to provide for  collaboration  between  Neurocrine  and Taisho in the
development  of NBI-6024  and to provide to Taisho  exclusive  commercialization
rights to  NBI-6024  in the  Neurocrine  Territory  (as  defined in the  License
Agreement)  as an  additional  option  set forth in Section  3.5 of the  License
Agreement.

           NOW THEREFORE,  in  consideration  of the foregoing and the covenants
and promises contained in this Amendment, the Parties agree as follows:



                                    ARTICLE 1

                                   DEFINITIONS

Unless otherwise defined herein, capitalized terms used in this Amendment and in
the License Agreement amended by this Amendment shall have the meanings assigned
to such terms in the License Agreement.

1.1      "Collaboration"   shall  mean  the  collaboration  between  Taisho  and
         Neurocrine  to  Develop  Licensed  Products  under  the terms set forth
         herein.

1.2      "Development  Plan"  shall  mean  the  annual  worldwide  plan  for the
         Development of Products as approved by the JSC.

1.3      "Licensed Territory" shall mean all the world.

1.4      "Milestone  Payments"  shall mean the  payments to be made by Taisho to
         Neurocrine  upon  occurrence of certain events as set forth in Sections
         5.1B and 5.2B or 5.5B.

1.5      "Net Sales"  shall mean the sales of Products  or, in the case of multi
         active components  Products,  NBI-6024  contributed portion thereof (as
         determined  by a  method  approved  by both  Parties),  for the sale of
         Products by Taisho or Affiliates or  sublicensees  of Taisho to a Third
         Party other than Affiliates or sublicensees of Taisho,  less the amount
         incurred such as returns and allowances (including, but not limited to,
         prompt payment and volume  discounts,  chargebacks from wholesalers and
         other  allowances  granted to  customers  or  wholesalers  of Products,
         whether  in cash or  trade),  freight,  shipping,  packing,  insurance,
         rebates,  and sales and other  taxes  based on sales when  included  in
         gross sales,  but not including  taxes when assessed on income  derived
         from such sales.

1.6      "Rest of World"  shall mean all the world other than Asian and European
         countries listed on Exhibit D.



                                    ARTICLE 2

                                   AMENDEMENTS

2.1      Amendment  of  Section  1.29.  Section  1,29 of the  License  Agreement
         ("Neurocrine Territory") is hereby deleted.

2.2      Amendment of Section 2.3.  Section  2.3(b) of the License  Agreement is
         hereby amended to read as set forth below.

         (b)  Indications.  Taisho will use Commercially  Reasonable  Efforts to
         obtain Governmental  Approvals to Develop and Commercialize NBI-6024 in
         the Licensed  Territory for all  reasonable  indications  to the extent
         regulatively and practically  appropriate taking into consideration the
         circumstances of markets in the Licensed Territory.

2.3      Amendment  of Section  2.4.  Section  2.4 of the License  Agreement  is
         hereby amended to read as set forth below.

         (a)  Development  and  Commercialization.  Neurocrine  covenants to use
         Commercially  Reasonable  Efforts to collaborate with Taisho to Develop
         and Commercialize Products in the Licensed Territory.

         (b) Compliance by Neurocrine.  Neurocrine covenants that all activities
         undertaken by Neurocrine in  collaborating  with Taisho  hereunder will
         comply with all applicable  statutes,  regulations  and guidance of any
         Governmental   Authorities   relating   to   the   Development   and/or
         Commercialization of Products.

2.4      Amendment of Section 3.2 (b).  Section 3.2(b) of the License  Agreement
         is hereby amended to read as set forth below.

         (b) Taisho hereby grants to Neurocrine [XXX]license[XXX] under Licensed
         Technology and Taisho Technology, [XXX]as set forth in this Agreement.

2.5      Amendment  of Section  3.3.  Section  3.3 of the License  Agreement  is
         hereby amended to read as set forth below.

         3.3  Sublicenses.  Taisho shall have the right to grant  sublicenses to
         Licensed Technology to Third Parties,  provided,  however,  that Taisho
         shall remain  responsible for the full and complete  performance of all
         obligations  hereunder.  Taisho shall provide Neurocrine with copies of
         all agreements sublicensing the Licensed Technology, [XXX]

2.6      Amendment  of Section  3.5.  Section  3.5 of the License  Agreement  is
         hereby deleted.

2.7      Amendment  of Section  4.1.  Section  4.1 of the License  Agreement  is
         hereby amended to delete "for each of the Parties" in Subsection (iii).

2.8      Amendment  of Section  4.2.  Section  4.2 of the License  Agreement  is
         hereby amended to read as set forth below.

         4.2  Meetings  and  Decision  of  the  Joint  Steering  Committee.  The
         chairperson  of the JSC  will be  designated  annually  by  Taisho  and
         Neurocrine  on  an  alternating  basis  starting  with  Neurocrine.   A
         secretary  will be appointed for each meeting and shall be  responsible
         for the minutes of the meeting.  The JSC shall meet no less  frequently
         than twice per year.  Decisions  of the JSC shall be made by  unanimous
         vote.  In the event the JSC is unable to reach  agreement on any issue,
         the issue shall be referred to the Senior Vice  President,  Development
         of Neurocrine and Head of Development of Taisho for resolution.  In the
         event these two persons are unable to reach agreement on the issue, the
         issue shall be finally  decided by Head of Development  of Taisho.  All
         decisions  of the JSC shall be  consistent  with the Five Year Plan and
         will be reached in good faith.

2.9      Amendment  of Section  4.3.  Section  4.3 of the License  Agreement  is
         amended to read as set forth below.

         4.3  Development  Plan.  Prior to the Effective Date the Parties worked
         together to coordinate a  development  plan for a global five year plan
         (the  "Five  Year  Plan" as set forth on  Exhibit  E).  The goal of the
         FiveYear Plan is to maximize  Product  potential  through  coordinated,
         efficient and cost effective  Development  and  Commercialization.  The
         FiveYear Plan includes outline  timelines for pre-clinical and clinical
         studies and Regulatory  Filings.  The Five Year Plan will be updated on
         an annual basis and, when necessary in consideration of the progress of
         the Development,  from time to time additionally by mutual agreement of
         the Parties.  On or before September 15 of each year the JSC will adopt
         a plan for the  Development  of Products for the Licensed  Territory in
         the next  following year (the  "Development  Plans").  The  Development
         Plans will be consistent with the then valid FiveYear Plan.

2.10     Amendment  of Section  4.4.  Section  4.4 of the License  Agreement  is
         hereby amended to read as set forth below.

         4.4 Data.  On each meeting of the JSC, and upon written  request at any
         other  time,  the  Parties  will  exchange  written  summaries  of  all
         Development  Data obtained to the date. All  Development  Data shall be
         considered  Confidential  Information  of  the  disclosing  Party.  The
         Parties shall maintain all Development Data, related records, documents
         and raw data in sufficient detail and in good scientific manner as will
         properly reflect all works done and results achieved in the performance
         of the Development.

2.11     Amendment  of Section  4.5.  Section  4.5 of the License  Agreement  is
         hereby deleted.

2.12     Amendment  of Section  4.6.  Section  4.6 of the License  Agreement  is
         hereby amended to read as set forth below.

         4.6 Collaboration.

         (a) Taisho will fund conduct of the Collaboration by no less than [XXX]
         Neurocrine FTEs (full time  equivalents  equal to [XXX] hours per year)
         for a period  of  [XXX].  Taisho  will  compensate  Neurocrine  for the
         Neurocrine  FTEs at a rate of [XXX] per FTE per [XXX].  The  Neurocrine
         FTEs  will be  devoted  [XXX].  The  number of  Neurocrine  FTEs may be
         increased or decreased  and/or  extended  beyond the initial  [XXX]term
         upon mutual agreement of the Parties.

         (b) Taisho may  request  that  Neurocrine  conduct on  Taisho's  behalf
         certain  research,  pre-clinical  studies,  and/or clinical  studies on
         Products set forth in Development Plan as a part of the  Collaboration.
         In the event  such  research,  pre-clinical  studies,  and/or  clinical
         studies  shall not be covered by the  Neurocrine  FTEs set forth in (a)
         above, Taisho will compensate Neurocrine for additional Neurocrine FTEs
         devoted to such research, pre-clinical studies, and/or clinical studies
         at a rate of [XXX].

2.13     Amendment  of Section  4.8.  Section  4.8 of the License  Agreement  is
         hereby amended to read as set forth below.

         4.8 Development  Cost.  [XXX]of all studies and activities and in-house
         study  costs  approved by the JSC based upon the Five Year Plan and the
         Development  Plan,  which are conducted  after  (effective date of this
         Amendment),  [XXX].  The outside  costs of all  studies and  activities
         [XXX]  approved  by the JSC  based  upon  the  Five  Year  Plan and the
         Development  Plan,  which  are  conducted  from the  execution  of this
         Agreement until (effective date of this  Amendment),  shall be [XXX] in
         accordance with [XXX] to be agreed by the Parties. Additionally, Taisho
         shall reimburse  Neurocrine  [XXX] of all development  expenses for the
         Licensed  Territory  that  occurred  from  December  25,  1999  to  the
         execution  of this  Agreement.  Such  reimbursement  will be due within
         thirty (30) days of the execution of this Agreement.

2.14     Amendment  of Section  4.9.  Section  4.9 of the License  Agreement  is
         hereby amended to read as set forth below.

         4.9  Commercialization.  The JSC shall monitor the Commercialization of
         Products.  All matters relating to Commercialization of Products in the
         Licensed Territory shall be decided by Taisho in Taisho's sole business
         judgment.

2.15     Amendment of Section  4.10.  Section  4.10 of the License  Agreement is
         hereby amended to read as set forth below.

         4.10  Reporting.  Neurocrine and Taisho shall each promptly  notify the
         other  of any  events  that  come to  their  attention  which  shall be
         reported to any Governmental Authorities under any laws and regulations
         including 21 CFR 314.80, 600.12, 600.14 and 600.80 of the United States
         (as such requirements may be amended from time to time) and any similar
         or equivalent reporting requirements to other Governmental Authorities.
         As for the events that occur in the context of  clinical  trials,  both
         Parties shall comply with provisions of Exhibit F.

2.16     Amendment  of Article 5.  Article 5 of the License  Agreement is hereby
         amended to read as set forth below.



                                    ARTICLE 5

                       LICENSE FEES AND MILESTONE PAYMENTS

          5.1  LICENSE FEES AND MILESTONE PAYMENTS FOR ASIA AND EUROPE.

5.1A Data Purchase.  On execution of this Agreement,  Taisho shall purchase from
Neurocrine  rights to the  Neurocrine CTX filing for NBI-6024 and all supporting
data  and  information  for use in  exploitation  of the  Asian  rights  granted
hereunder  for a  one-time  payment of [XXX] and  rights to the  Neurocrine  CTX
filing  for  NBI-6024  and  all  supporting  data  and  information  for  use in
exploitation of the European rights granted  hereunder for a one-time payment of
[XXX].  The above payments shall be made within thirty (30) days of execution of
this Agreement.

5.1B Milestone Payments. At the first occurrence of the events as to the Product
first  applicable  to the events set forth below,  within thirty (30) days after
Taisho  becomes aware of it, Taisho shall pay the  corresponding  amounts as the
Milestone  Payments for the rights in Asian countries and European  countries to
Products  granted  to it as long as  this  Agreement  is in  force  and  effect,
provided,  however, as to the events which occurred before the execution of this
Agreement,  Taisho shall pay the corresponding amount within thirty (30) days of
the execution of this Agreement:

a)       for the rights in Japan and other Asian countries total $[XXX]

         o        [XXX] Phase II [XXX] $[XXX]

         o        [XXX] Pediatric Phase II [XXX] $[XXX]

         o        [XXX] Phase III [XXX] $[XXX]

         o        Regulatory  Filing  of  New  Drug  Application  or  any  other
                  comparable filing [XXX] $[XXX]

         o        Governmental Approval for [XXX] $[XXX]

b)       for the rights in European countries total $[XXX]

         o        [XXX] Phase II [XXX] $[XXX]

         o        [XXX] Pediatric Phase II [XXX] $[XXX]

         o        [XXX] Phase III [XXX] $[XXX]

         o        Regulatory  Filing  of  New  Drug  Application  or  any  other
                  comparable filing in [XXX] $[XXX]

         o        Governmental Approval for Commercialization [XXX] $[XXX]

         Each Milestone  Payment shall be made only once.  [XXX] upon Regulatory
         Filing of New Drug  Application or any other  comparable  filing in any
         country in Asian and European countries listed on Exhibit D.



5.2 LICENSE FEES AND MILESTONE PAYMENTS FOR REST OF WORLD.

         5.2A.  License  Issue Fee.  In  consideration  of the  licenses  to the
         Licensed Technology in the Rest of World, Taisho will pay to Neurocrine
         a license fee of [XXX].  The above  payment shall be made within thirty
         (30) days of execution of this Amendment.

         5.2B Milestone  Payments.  At the first  occurrence of the events as to
         the Product  first  applicable  to the events set forth  below,  within
         thirty (30) days after Taisho becomes aware of it, Taisho shall pay the
         corresponding  amounts as the Milestone  Payments for the rights in the
         Rest of World to Products granted to it as long as this Agreement is in
         force and effect,  provided,  however,  as to the events which occurred
         before(effective  date  of  this  Amendment),   Taisho  shall  pay  the
         corresponding  amount within thirty (30) days from  (effective  date of
         this Amendment):

         o        Completion of [XXX] Phase I [XXX] $[XXX]

         o        [XXX] Phase II [XXX] $[XXX]

         o        [XXX] Pediatric Phase II [XXX] $[XXX]

         o        [XXX] Phase III [XXX] $[XXX]

         o        Regulatory Filing of New Drug Application [XXX] $[XXX]

         o        Governmental Approval for Commercialization [XXX] $[XXX]

         Each Milestone  Payment shall be made only once.  [XXX] upon Regulatory
         Filing of New Drug Application in the United States.

5.3  Third  Party  Royalties.  [XXX]  shall  bear any  payments  (license  fees,
milestone  payments  and  royalties  and so on) owed or to be owed to the  Third
Parties with respect to Existing Royalty  Obligations in the Licensed Territory.
In consideration of [XXX] Existing Royalty  Obligations  [XXX] will pay to [XXX]
bear any other payments (license fees,  milestone  payments and royalties and so
on) owed or to be owed to Third Parties other than their Affiliates with respect
to patents or patent applications in the Licensed  Territory,  that are owned or
controlled by such Third Parties and that would [XXX]on the basis [XXX] directed
to [XXX].  [XXX] shall bear any payments (license fees,  milestone  payments and
royalties  and so on)  owed or to be owed to  Third  Parties  other  than  [XXX]
Affiliates with respect to such Third Parties' patents or patent applications in
the Licensed Territory other than those described in above two cases.

5.4 Sublicense  Fee. Within thirty (30) days of the date upon which [XXX] or its
Affiliate  shall grant a  sublicense  to the [XXX] to any Third Party other than
[XXX]  shall pay [XXX] per each of such Third  Parties as  executing  parties of
sublicense  agreement  with [XXX].  In the event a  sublicensee  of [XXX] (other
[XXX] shall further  sublicense the Licensed  Technology,  [XXX] will be payable
for such further sublicense unless under the circumstances [XXX] that would have
been more [XXX].

5.5 PROFIT SHARING OPTION FOR REST OF WORLD

         5.5A Profit  Sharing  Option.  At any time after [XXX] and before [XXX]
         shall  have the  option to elect to change  the  agreement  for Rest of
         World from a royalty bearing arrangement as provided in Section 5.2, to
         a  profit  sharing  structure  as set  forth in this  Section  5.5 (the
         "Option").  At the time [XXX] to exercise  the Option the Parties  will
         [XXX]  Development  and  Commercialization  of  Products in the Rest of
         World.  [XXX]completed  prior to [XXX],  provided,  however,  that such
         [XXX] shall be [XXX].

         5.5B Milestone Payments.

         In the event [XXX] on or before the date of the first occurrence of the
         events  [XXX]  to  the  events  [XXX],  Section  5.2B  will  not  apply
         irrespective  of its provision and the following  provision  will apply
         instead.  In the event [XXX] after the date of the first  occurrence of
         the  events  [XXX]  to  the  events  stipulated  [XXX],   Section  5.2B
         irrespective  of its provision  shall no longer apply and the following
         provision will apply instead.

          At  the  first  occurrence  of the  events  as to  the  Product  first
         applicable to the events set forth below, within thirty (30) days after
         Taisho becomes aware of it, Taisho shall pay the corresponding  amounts
         as the  Milestone  Payments  for the  rights  in the  Rest of  World to
         Products  granted  to it as long  as this  Agreement  is in  force  and
         effect,  provided,  however,  as to the events  which  occurred  before
         (effective date of this Amendment),  Taisho shall pay the corresponding
         amount within thirty (30) days from (effective date of this Amendment):

         o        Completion of [XXX] Phase I [XXX] $[XXX]

         o        [XXX] Phase II [XXX] $[XXX]

         o [XXX] Pediatric Phase II [XXX] $[XXX]

         o [XXX] Phase III [XXX] $[XXX]

         o Regulatory Filing of New Drug Application [XXX] $[XXX]

         o Governmental Approval for Commercialization [XXX] $[XXX]

         Each Milestone  Payment shall be made only once.  [XXX] upon Regulatory
         Filing of New Drug Application in the United States.

         If any Milestone  Payments  [XXX] in any country in the world have been
         made pursuant to Section 5.2B prior to the exercise of the Option,  the
         amount of each subsequent Milestone Payment under this Section 5.5B for
         the rights in the Rest of World shall [XXX] so that the total Milestone
         Payments  under this  Section  5.5B for the rights in the Rest of World
         [XXX]. For clarity, the license fee of [XXX] payable under Section 5.2A
         [XXX].

         5.5C Royalties. Neurocrine shall be paid a royalty of [XXX]of Net Sales
         of  Products in the United  States and a royalty  [XXX] of Net Sales of
         Products in the Rest of World  excluding  the United  States  until the
         time set forth in 6.4 (c).

         5.5D Profit  Sharing.  Taisho and Neurocrine will [XXX] the net profits
         from sales of  Products in the Rest of World.  The net profits  will be
         calculated by subtracting  [XXX]other than those [XXX] to calculate Net
         Sales,  the  royalties  due  [XXX]  set forth in [XXX] Net Sales in the
         United States as Neurocrine's  Existing Royalty  Obligation [XXX], from
         Net Sales of Products [XXX]. For clarity, any payments [XXX] other than
         [XXX] of Net Sales in the United  States  [XXX]  Neurocrine's  Existing
         Royalty  Obligation  [XXX]  shall not be  subtracted  from Net Sales of
         Products in the Rest of World [XXX].

         5.5E Third Party  Royalties.  In the event [XXX] the Option  before any
         [XXX], Section 5.3 will not apply irrespective of its provision and the
         following  provision will apply instead. In the event [XXX] on or after
         [XXX], Section 5.3 irrespective of its provisions shall no longer apply
         and the following provision will apply instead.

         [XXX] shall bear any payments  (license  fees,  milestone  payments and
         royalties  and so on)  owed  or to be owed to the  Third  Parties  with
         respect to  Existing  Royalty  Obligations  in the  Licensed  Territory
         ([XXX]  which  shall  be  paid as set  forth  [XXX]any  other  payments
         (license fees,  milestone  payments and royalties and so on) owed or to
         be owed to Third  Parties other than their  Affiliates  with respect to
         patents or patent  applications  in the  Licensed  Territory,  that are
         owned or controlled by such Third Parties and that would [XXX] Products
         on the basis of [XXX] directed to [XXX].  With respect to Third Parties
         patents or patent  applications  in the Licensed  Territory  other than
         those  described  in above two cases,  [XXX]  shall  bear any  payments
         (license fees,  milestone  payments and royalties and so on) owed or to
         be owed to such Third  Parties  other than [XXX] in Asian and  European
         countries  listed on Exhibit D, and [XXX] any payments  (license  fees,
         milestone  payments and royalties and so on) owed or to be owed to such
         Third Parties other than [XXX] in the Rest of World.

         5.5F Supply and Manufacturing. In the event [XXX] the Option, the price
         for supply of NBI-6024 for Commercialization in the Rest of World shall
         be [XXX] and so the  provisions in Section 6.4 with regard to the price
         for supply for Rest of World,  irrespective of the provisions set forth
         in Section 6.4,  will not apply to the supply for the Rest of World and
         the  provisions  of Section  6.4 will then apply only to the supply for
         Asian countries and European countries.  Similarly,  in the event [XXX]
         the Option, the provisions in Section 6.7 with regard to the royalty to
         be paid by Taisho,  irrespective of the provisions of Section 6.7, will
         not  apply to the  manufacturing  by  Taisho  or its  subcontractor  of
         NBI-6024  for the Rest of World  (Taisho  shall not pay any royalty for
         the  manufacturing  by Taisho or its  subcontractor of NBI-6024 for the
         Rest of World) and the  provisions  of Section 6.7 will then apply only
         to the  manufacturing  by Taisho or its  subcontractor  of NBI-6024 for
         Asian countries and European countries.

2.17     Amendment  of Article 6.  Article 6 of the License  Agreement is hereby
         amended to delete all references to Independent  Studies and Neurocrine
         Territory.

2.18     Amendment  of Section  6.4.  Section  6.4 of the License  Agreement  is
         hereby amended to add the following subsection (c).

         (c) for Rest of World in the  Licensed  Territory,  the  expiration  of
         Patent Right last to expire of the Licensed Patent Rights in the United
         States.

2.19     Amendment  of Section  6.7.  Section  6.7 of the License  Agreement  is
         hereby amended to read as set forth below.

         6.7  Manufacturing  by Taisho.  To the extent of not  conflicting  with
         Sections 6.1 and 6.2 above or after the expiration of Patent Right last
         to expire of Licensed Patent Rights in the Licensed  Territory,  Taisho
         shall have the right to manufacture NBI-6024 for the Licensed Territory
         and/or have NBI-6024 manufactured on its behalf, which shall be subject
         to the terms and conditions to be agreed by the Parties [XXX].  In such
         cases,   Taisho   shall  pay  in   consideration   of  the  license  of
         Manufacturing  Technology  (a) the  royalty  [XXX] of Net  Sales in all
         Asian  countries in the Licensed  Territory until the time set forth in
         Section  6.4 (a),  (b) the royalty  [XXX] of Net Sales in all  European
         countries in the Licensed Territory until the time set forth in Section
         6.4 (b) and (c) the  royalty  [XXX] of Net Sales in Rest of World until
         the time set forth in  6.4(c),  provided  however  [XXX] to the case in
         which [XXX] shall manufacture [XXX] and supply it to [XXX]. In case the
         manufacturing   cost  incurred   [XXX]  is  [XXX]  to  meet  the  above
         requirements, [XXX] shall seek for [XXX] including [XXX].

2.20     Amendment  of Section  8.1.  Section  8.1 of the License  Agreement  is
         hereby amended to read as set forth below.

         8.1 Trademarks. Taisho will market Products under its own Trademarks.

2.21     Amendment of Section 8.2 (b). Section 8.2 (b) of the License  Agreement
         is hereby amended to read as set forth below.

         (b)  Expenses.   All  expenses  in  connection  with   prosecution  and
         maintenance  of the  Licensed  Patent  Rights  will be borne by  [XXX],
         provided,  however, [XXX] shall bear a) all expenses incurred after the
         execution  of  this  Agreement  in  connection  with   prosecution  and
         maintenance  of the Licensed  Patent Rights in [XXX] to the extent this
         Agreement  is in  force  and  effect  until  (effective  date  of  this
         amendment),  and b) all expenses incurred after (effective date of this
         amendment)  in  connection  with  prosecution  and  maintenance  of the
         Licensed  Patent  Rights in the  Licensed  Territory to the extent this
         Agreement is in force and effect.

2.22     Amendment of Sections 8.3 and 8.4.  Sections 8.3 and 8.4 of the License
         Agreement are hereby amended to delete all references to the Neurocrine
         Territory And to replace all "the  execution of this  Agreement" in the
         both Sections with (effective date of this amendment).

2.23     Amendment of Sections 8.5.  Sections 8.5(a) of the License Agreement is
         hereby amended to read as set forth below.

         (a) Intellectual property rights regarding any invention made by either
         Party during the term of this  Agreement  shall be solely owned by such
         Party, and the other Party shall have no rights in or to such invention
         other  than those  rights  specifically  granted  to such  other  Party
         hereunder.  The Party who made the  invention  shall  have the right to
         prosecute and maintain, in its sole discretion and at its own expenses,
         all  patent  application  or patent  regarding  such  invention  in any
         country in the world. Taisho, its Affiliates and its sublicensees shall
         have a  non-exclusive  right to exercise  such  invention by Neurocrine
         free   of   charge   only   for  the   purpose   of   Development   and
         Commercialization of Products in the Licensed Territory.

2.24     Amendment of Section  11.1.  Section  11.1 of the License  Agreement is
         hereby amended to read as set forth below.

         11.1 Indemnification.

         (a) Non-Patent.  Taisho shall  indemnify and hold  Neurocrine  harmless
         from and against any and all liability,  damage,  loss, cost (including
         reasonable  attorneys' fees) and expense arising out of the Development
         and/or  Commercialization  of Products by Taisho, its Affiliates and/or
         its  sublicensees  and  including the conduct of the  Collaboration  by
         Neurocrine other than those arising out of the infringement of a Patent
         Right of a Third Party through the making, using or selling of Products
         by Taisho, its Affiliates and/or its sublicensees,  provided,  however,
         in case Neurocrine receives notice of a claim for which indemnification
         may be sought,  Neurocrine shall promptly inform Taisho of such notice.
         Notwithstanding  the  foregoing  Neurocrine  shall not be  entitled  to
         indemnification  under  this  subsection  (a),  against  any  claim  of
         personal  injury  or  property  damage  to the  extent  resulting  from
         Neurocrine's negligence or misconduct.

         (b) Patent. Subject to Section 5.3 and Article 8, Taisho will indemnify
         Neurocrine  and hold  Neurocrine  harmless from and against any and all
         liability,  damage, loss, cost (including  reasonable  attorneys' fees)
         and expense  arising out of any claim of infringement of a Patent Right
         of a Third Party  through the making,  having made,  using,  selling or
         having sold  Products  by or on behalf of Taisho  which is brought by a
         Third Party, provided, however, in case Neurocrine receives notice of a
         claim  for  which  indemnification  may  be  sought,  Neurocrine  shall
         promptly inform Taisho of such notice and, provided, further, that .the
         foregoing  shall not  apply to any Third  Party  licensor  of  Existing
         Royalty Patent Rights.

2.25     Amendment of Section  12.2.  Section  12.2 of the License  Agreement is
         hereby revised to read as set forth below.

         12.2 Termination of Product Development.

         Should Taisho [XXX],  rights of Taisho to Products (including all data,
         information,  physical  manifestations  and Regulatory  Filings) in the
         Licensed  Territory  shall revert and be delivered to  Neurocrine,  and
         Taisho  shall  be  free  from  any and all  monetary  or  developmental
         obligations  thereafter.  In  addition,  Neurocrine  shall be granted a
         royalty-free  worldwide  non-exclusive license with sublicensing rights
         under the Taisho  Technology to make, have made, use and sell Products.
         Should [XXX] may retain its all rights of Asian and European  countries
         listed  on  Exhibit D subject  to the terms and the  condition  of this
         Agreement  originally  executed by the Parties  (i.e.  the original one
         before being given any amendment).



                                    ARTICLE 3

                            MISCELLANEOUS PROVISIONS

3.1      Further Actions. Each Party agrees to execute,  acknowledge and deliver
         such  further  instruments,  and to do all such other  acts,  as may be
         necessary or  appropriate in order to carry out the purposes and intent
         of this Amendment.

3.2      Counterparts.  This  Amendment  shall be executed in two  counterparts,
         each of which shall  contain the  signature of the Parties and all such
         counterparts shall constitute one and the same agreement.

3.3      Descriptive  Headings.  The descriptive  headings of this Amendment are
         for convenience  only, and shall be of no force or effect in construing
         or interpreting any of the provisions of this Amendment.

3.4      Governing Law. This Amendment  shall be governed by and  interpreted in
         accordance with the substantive laws of the State of California.

3.5      Severability.  Whenever possible, each provision of this Amendment will
         be  interpreted  in such  manner as to be  effective  and  valid  under
         applicable  law, but if any  provision of this  Amendment is held to be
         prohibited by or invalid under  applicable  law, such provision will be
         ineffective  only to the  extent  of such  prohibition  or  invalidity,
         without invalidating the remainder of this Amendment.

3.6      Entire  Agreement  of the Parties.  This  Amendment  together  with the
         License  Agreement will constitute and contain the complete,  final and
         exclusive  understanding  and  agreement of the Parties and cancels and
         supersedes   any   and   all   prior   negotiations,    correspondence,
         understandings  and  agreements,  whether oral or written,  between the
         Parties respecting the subject matter hereof.

3.7      Dispute  Resolution.  The Parties  agree that in the event of a dispute
         between them arising  from,  concerning  or in any way relating to this
         Amendment,  the Parties shall  undertake  good faith efforts to resolve
         any such  dispute  in good  faith.  In the event the  Parties  shall be
         unable to resolve any such dispute, the matter shall be referred to the
         Chief  Executive  Officer of Neurocrine and the President of Taisho for
         further review and  resolution.  In the event that they shall be unable
         to resolve the dispute,  then the dispute  shall be finally  settled by
         arbitration,  in  San  Francisco,   California,   under  the  Rules  of
         Conciliation and Arbitration of the International  Chamber of Commerce.
         The award of arbitration shall be final and binding upon both Parties.





IN WITNESS  WHEREOF,  the Parties  hereto have executed this Amendment as of the
date first above written.


NEUROCRINE BIOSCIENCES, INC.

/s/ Margaret Valeur-Jensen
- ---------------------------
By: Margaret Valeur-Jensen
Title: Senior Vice President and General Counsel



TAISHO PHARMACEUTICAL CO., LTD.

/s/ Akira Uehara
- ----------------
By: Akira Uehara
Title: President