Exhibit 2.2



                          REGISTRATION RIGHTS AGREEMENT


         This REGISTRATION  RIGHTS AGREEMENT (the "Agreement") is made as of May
28, 1998, by and among Neurocrine Biosciences, Inc., a Delaware corporation (the
"Parent") and the persons listed on the signature page who become signatories to
this Agreement  (collectively,  the "Investors and  individually an "Investor").
Capitalized terms not defined herein shall have the meanings ascribed to them in
the Agreement and Plan of Reorganization dated May 1, 1998.

                                 R E C I T A L S

         WHEREAS, in connection with the merger (the "Merger") of a wholly owned
subsidiary  of  Parent  with and into  Northwest  NeuroLogic,  Inc.,  an  Oregon
corporation  ("NNL") pursuant to the Agreement and Plan of Reorganization  dated
of even date  herewith,  Parent and the Investors  desire to provide for certain
rights of the Investors with respect to  registration of the Parent Common Stock
issued by Parent to the  Investors  upon exchange of the NNL Common Stock in the
Merger.

         WHEREAS,  it is a  condition  of the  closing of the Merger that Parent
enter into this Agreement.

         NOW THEREFORE, in consideration of the promises set forth above and for
other good and valuable consideration,  receipt of which is hereby acknowledged,
the parties agree as follows:

         1.       Certain Definitions.  As used in this Agreement, the following
terms shall have the following respective meanings:

                  (a)  "Commission"  shall  mean  the  Securities  and  Exchange
Commission or any other federal agency at the time  administering the Securities
Act.

                  (b) "Form S-3" shall mean Form S-3 issued by the Commission or
any substantially similar form then in effect.

                  (c) "Holder" shall mean any holder of outstanding  Registrable
Securities which have not been sold to the public, but only if such holder is an
Investor or an assignee or  transferee  of  Registration  rights as permitted by
Section 8.

                  (d)  "Initiating  Holders"  shall  mean  Holders  who  in  the
aggregate  hold and propose to register  at least  [***]  shares of  Registrable
Securities.






                  (e) "Material Adverse Event" shall mean an occurrence having a
consequence  that  either  (a)  is  materially   adverse  as  to  the  business,
properties,  prospects or financial condition of the Parent or (b) is reasonably
foreseeable,  has a reasonable likelihood of occurring,  and if it were to occur
would  materially  adversely  affect  the  business,  properties,  prospects  or
financial condition of the Parent.

                  (f) The  terms  "Register",  "Registered"  and  "Registration"
refer  to a  registration  effected  by  preparing  and  filing  a  registration
statement in compliance with the Securities Act ("Registration Statement"),  and
the declaration or ordering of the effectiveness of such Registration Statement.

                  (g) "Registrable  Securities"  shall mean all shares of Parent
Common  Stock  issued or issuable to the  Investors  upon closing of the Merger,
including  Common Stock issued  pursuant to stock  splits,  stock  dividends and
similar distributions with respect to such shares, provided that such shares (i)
are not available for immediate  sale in the opinion of counsel to the Parent in
a transaction exempt from the registration and prospectus delivery  requirements
of the Securities Act so that all transfer  restrictions and restrictive legends
with respect  thereto are removed  upon  consummation  of such sale  pursuant to
Regulation S, Rule 144, or otherwise under applicable  federal  securities laws,
or (ii) have not previously been sold to the public.

                  (h)  "Registration  Expenses" shall mean all expenses incurred
in complying with Section 2 of this Agreement,  including,  without  limitation,
all federal and state  registration,  qualification  and filing  fees,  printing
expenses,  fees and  disbursements of counsel for the Parent,  blue sky fees and
expenses,  and the expense of any special audits  incident to or required by any
such registration, other than Selling Expenses.

                  (i) "Securities Act" shall mean the Securities Act of 1933, as
amended,  or any similar federal  statute,  and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

                  (j) "Selling  Expenses" shall mean all underwriting  discounts
and  selling  commissions  applicable  to the  sale  of  Registrable  Securities
pursuant to this Agreement,  as well as fees and  disbursements of legal counsel
for the selling Holders.

         2.       Demand Registration.






                  2.1 Request for Registration on Form S-3. Subject to the terms
of this Agreement,  in the event that Parent receives from Initiating Holders at
any time  after the  Effective  Time and prior to the first  anniversary  of the
Effective  Time, a written  request that Parent effect any  Registration on Form
S-3 (or any successor form to Form S-3 regardless of its  designation) at a time
when Parent is eligible to  register  securities  on Form S-3 (or any  successor
form to Form S-3 regardless of its  designation)  for an offering of Registrable
Securities, the reasonably anticipated aggregate offering price to the public of
which would  exceed  [***],  Parent will  promptly  give  written  notice of the
proposed  Registration  to all the  Holders  and will,  as soon as  practicable,
effect  Registration  of the Registrable  Securities  specified in such request,
together  with all or such portion of the  Registrable  Securities of any Holder
joining in such request as are specified in a written  request  delivered to the
Parent  within 20 days after  written  notice  from the  Parent of the  proposed
Registration.  Parent  shall not be  obligated  to take any action to effect any
such  registration  pursuant to this Section 2.1: (i) prior to 90 days after the
Effective  Time,  (ii) subsequent to 365 days after the Effective Time, or (iii)
after Parent has effected one such Registration pursuant to this Section 2.1 and
such Registration has been declared effective and, if underwritten, has closed.

                  2.2 Right of Deferral  of  Registration.  If (i) Parent  shall
furnish to all such  Holders who joined in the request a  certificate  signed by
the President of Parent stating that, in the good faith judgment of the Board of
Directors  of  Parent,  it would be  seriously  detrimental  to  Parent  for any
Registration to be effected as requested under Section 2.1, or (ii) Parent shall
have effected a Registration  other than a Registration of securities  issued or
issuable  pursuant  to an employee  benefit  plan  (whether  or not  pursuant to
Section 2.1) within ninety (90) days preceding the date of such request,  Parent
shall  have the  right to defer  the  filing of a  Registration  Statement  with
respect to such  offering for a period of not more than (i) sixty (60) days from
delivery of the request of the Initiating  Holders,  or (ii) ninety (90) days of
the date of filing of such prior Registration respectively;  provided,  however,
that Parent may not utilize this right more than twice in any 12-month period.

                  2.3  Registration  of  Other   Securities.   Any  Registration
Statement  filed  pursuant to the request of the  Initiating  Holders under this
Section 2 may, subject to the provisions of Section 2.4,  include  securities of
Parent other than Registrable Securities.

                  2.4      Underwriting in Demand Registration.

                           2.4.1       Notice of Underwriting.  If the
Initiating  Holders intend to distribute the Registrable  Securities  covered by
their request by means of an underwriting, they shall so advise Parent as a part
of their  request made pursuant to this Section 2, and Parent shall include such
information in the written  notice  referred to in Section 2.1. The right of any
Holder to  Registration  pursuant to Section 2.1 shall be conditioned  upon such
Holder's agreement to participate in such underwriting and the inclusion of such
Holder's  Registrable  Securities in the underwriting (unless otherwise mutually
agreed by a majority in interest of the Initiating  Holders and such Holder with
respect to such participation and inclusion).

                           2.4.2       Inclusion of Other Holders in Demand
Registration.  If Parent,  officers or directors of Parent  holding Common Stock
other  than  Registrable  Securities,   or  holders  of  securities  other  than
Registrable  Securities (who are collectively  referred to as "Other  Holders"),
request inclusion in such Registration, the Initiating Holders shall, subject to
the  allocation  provisions  of Section  2.4.4 below,  on behalf of all Holders,
offer  to such  Other  Holders  that  such  securities  other  than  Registrable
Securities be included in the  underwriting,  conditioned upon the acceptance by
such Other  Holders of the terms of this Section 2. In event of the inclusion in
the  Registration of securities held by Other Holders,  such Other Holders shall
be deemed to be Holders for all purposes  under this  Agreement,  other than the
allocation provisions of Section 2.4.4 below.






                           2.4.3       Selection of Underwriter in Demand 
Registration.  Parent shall  (together with all Holders  proposing to distribute
their  securities  through  such  underwriting)   enter  into  and  perform  its
obligations under an underwriting agreement in usual and customary form with the
representative   ("Underwriter's   Representative")   of  the   underwriter   or
underwriters  selected for such underwriting by the Holders of a majority of the
Registrable  Securities being registered by the Initiating Holders and consented
to by Parent (which consent shall not be unreasonably withheld).

                           2.4.4       Marketing Limitation in Demand 
Registration.   In  the  event  the  Underwriter's  Representative  advises  the
Initiating   Holders  in  writing  that  market  factors   (including,   without
limitation,  the  aggregate  number of shares of Common  Stock  requested  to be
Registered,  the general condition of the market,  and the status of the persons
proposing to sell securities pursuant to the Registration)  require a limitation
of the number of shares to be underwritten, then the Initiating Holders shall so
advise all Holders and Other  Holders,  and the number of shares of  Registrable
Securities and other  securities  that may be included in the  Registration  and
underwriting   shall  be  allocated  first  among  all  Holders  of  Registrable
Securities and Other Holders of securities  subject to contractual  registration
rights  and  second  among  all Other  Holders  of  securities  not  subject  to
contractual registration rights, in proportion, as nearly as practicable, to the
number of shares proposed to be included in such  Registration by such Holder or
Other Holder.  No Registrable  Securities or other securities  excluded from the
underwriting  by  reason  of  this  Section  2.4.4  shall  be  included  in such
Registration Statement.

                           2.4.5       Right of Withdrawal in Demand
Registration.  If any  Holder of  Registrable  Securities,  or a holder of other
securities  entitled  (upon  request)  to  be  included  in  such  Registration,
disapproves of the terms of the underwriting,  such person may elect to withdraw
therefrom  by  written  notice to Parent,  the  underwriter  and the  Initiating
Holders  delivered  at  least  seven  days  prior to the  effective  date of the
Registration Statement. The securities so withdrawn shall also be withdrawn from
the Registration Statement.

                  2.5  Blue  Sky in  Demand  Registration.  In the  event of any
Registration  pursuant to Section 2, Parent will exercise  reasonable efforts to
Register and qualify the securities covered by the Registration  Statement under
such other  securities  or Blue Sky laws of such  jurisdictions  as the  Holders
shall  reasonably  request  and as  shall  be  reasonably  appropriate  for  the
distribution of such  securities;  provided,  however,  that Parent shall not be
required to qualify to do  business  or to file a general  consent to service of
process in any such states or jurisdictions.

         3. Expenses of  Registration.  All  Registration  Expenses  incurred in
connection  with one  Registration  pursuant  to  Section  2.1 shall be borne by
Parent. However, Parent shall not be required to pay for any expenses of Holders
in connection with any registration  proceeding begun pursuant to Section 2.1 if
the registration request is subsequently withdrawn at the request of the Holders
of a majority of the  Registrable  Securities  to be registered  (which  Holders
shall bear such expenses);  provided,  however,  that (i) if at the time of such
withdrawal,  the Holders have learned of a Material  Adverse  Event not known to
the Holders at the time of their request or (ii) such withdrawal is made after a
deferral  of such  registration  by Parent  pursuant  to Section  2.2,  then the
Holders shall not be required to pay any of such expenses and shall retain their
rights  pursuant  to Section  2.1.  All Selling  Expenses  shall be borne by the
Holders  of the  securities  registered  pro rata on the basis of the  number of
shares registered.






         4.  Registration  Procedures.   Parent  will  keep  each  Holder  whose
Registrable  Securities  are  included  in any  registration  pursuant  to  this
Agreement advised as to the initiation and completion of such  Registration.  At
its expense Parent will: (a) use  reasonable  efforts to keep such  Registration
effective for a period ending on the first  anniversary of the Effective Time or
until the Holder or Holders have  completed  the  distribution  described in the
Registration  Statement relating thereto (including  Registrable Securities that
will  be  released  from  lockup  agreements  after  the  effective  date of the
Registration),  whichever first occurs;  (b) furnish such number of prospectuses
(including  preliminary  prospectuses) and other documents as a Holder from time
to time  may  reasonably  request;  (c)  prepare  and  file  with  the SEC  such
amendments  and  supplements to such  registration  statement and the prospectus
used in  connection  with such  registration  statement  as may be  necessary to
comply with the provisions of the Securities Act with respect to the disposition
of all securities  covered by such registration  statement;  and (d) notify each
Holder of Registrable  Securities covered by such Registration  Statement at any
time when a prospectus  relating  thereto is required to be delivered  under the
Securities Act of the happening of any event as a result of which the prospectus
included in such Registration  Statement,  as then in effect, includes an untrue
statement of a material  fact or omits to state a material  fact  required to be
stated therein or necessary to make the statements therein not misleading in the
light of the circumstances then existing.

         5. Information  Furnished by Holder. It shall be a condition  precedent
of Parent's  obligations  under this  Agreement  that each Holder of Registrable
Securities  included  in any  Registration  furnish to Parent  such  information
regarding such Holder and the distribution proposed by such Holder or Holders as
Parent may reasonably request.

         6.       Indemnification.

         6.1 Parent's  Indemnification  of Holders.  To the extent  permitted by
law,  Parent will  indemnify  each Holder,  each of its officers,  directors and
constituent  partners,  legal counsel and accountants for the Holders,  and each
person   controlling   such  Holder,   with   respect  to  which   Registration,
qualification or compliance of Registrable Securities has been effected pursuant
to this Agreement,  and each  underwriter,  if any, and each person who controls
any underwriter against all claims,  losses,  damages or liabilities (or actions
in respect  thereof) to the extent such claims,  losses,  damages or liabilities
arise  out  of or are  based  upon  any  untrue  statement  (or  alleged  untrue
statement) of a material  fact  contained in any  prospectus  or other  document
(including   any   related   Registration   Statement)   incident  to  any  such
Registration,  qualification  or  compliance,  or are based on any  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 any violation by
Parent of the Securities  Act, the  Securities  Exchange Act of 1934, as amended
(the  "1934  Act"),  or any  state  securities  law,  or any rule or  regulation
promulgated  under the Securities Act, the 1934 Act or any state securities law,
applicable  to Parent and  relating to action or inaction  required of Parent in
connection with any such Registration,  qualification or compliance;  and Parent
will reimburse each such Holder, each of its officers, directors and constituent
partners, legal counsel and accountants,  each such underwriter, and each person
who  controls  any such  Holder  or  underwriter,  for any  legal  and any other
expenses reasonably incurred,  as incurred,  in connection with investigating or
defending any such claim, loss, damage, liability or action; provided,  however,
that the indemnity contained in this Section 6.1 shall not apply to amounts paid
in settlement of any such claim, loss, damage, liability or action if settlement
is effected  without the consent of Parent (which consent shall not unreasonably
be withheld); and provided,  further, that Parent will not be liable in any such
case to the extent  that any such  claim,  loss,  damage,  liability  or expense
arises out of or is based  upon any  untrue  statement  or  omission  based upon
written information furnished to Parent by such Holder, its officers, directors,
constituent  partners,  legal counsel,  accountants,  underwriter or controlling
person and stated to be for use in connection with the offering of securities of
Parent.

                  6.2  Holder's   Indemnification   of  Parent.  To  the  extent
permitted  by law,  each Holder will,  if  Registrable  Securities  held by such
Holder  are  included  in  the   securities  as  to  which  such   Registration,
qualification  or  compliance  is being  effected  pursuant  to this  Agreement,
indemnify  Parent,  each of its directors  and officers,  each legal counsel and
independent  accountant  of the Parent,  each  underwriter,  if any, of Parent's
securities  covered by such a Registration  Statement,  each person who controls
Parent or such  underwriter  within the meaning of the Securities  Act, and each
other such Holder, each of its officers, directors,  constituent partners, legal
counsel and accountants and each person  controlling such other Holder,  against
all claims,  losses,  damages and  liabilities  (or actions in respect  thereof)
arising out of or based upon any untrue statement (or alleged untrue  statement)
by such Holder, of a material fact contained in any such Registration Statement,
prospectus,   offering  circular  or  other  document   (including  any  related
Registration  Statement)  incident to any such  Registration,  qualification  or
compliance,  or any  omission (or alleged  omission)  by such  Holder,  to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein  not  misleading,  or any  violation  by such  Holder of the
Securities  Act,  the  1934  Act or any  state  securities  law,  or any rule or
regulation  promulgated  under  the  Securities  Act,  the 1934 Act or any state
securities  law,  applicable  to such Holder and  relating to action or inaction
required of such Holder in connection with any such Registration,  qualification
or  compliance;  and  will  reimburse  Parent,  such  Holders,  such  directors,
officers,  partners,  persons, law and accounting firms, underwriters or control
persons for any legal and any other expenses reasonably  incurred,  as incurred,
in connection  with  investigating  or defending any such claim,  loss,  damage,
liability or action,  in each case to the extent,  but only to the extent,  that
such  untrue  statement  (or alleged  untrue  statement),  omission  (or alleged
omission)  or  violation  (or alleged  violation)  is made in such  Registration
Statement,  prospectus, offering circular or other document in reliance upon and
in conformity  with written  information  furnished to Parent by such Holder and
stated to be specifically  for use in connection with the offering of securities
of Parent,  provided,  however,  that each Holder's liability under this Section
6.2 shall not exceed such  Holder's net proceeds from the offering of securities
made in  connection  with such  Registration;  and provided,  further,  that the
indemnity  contained  in this  Section  6.2 shall not apply to  amounts  paid in
settlement of any such claim, loss, damage, liability or action if settlement is
effected without the consent of the Holder (which consent shall not unreasonably
be withheld).






                  6.3  Indemnification  Procedure.  Promptly after receipt by an
indemnified  party  under this  Section 6 of notice of the  commencement  of any
action, such indemnified party will, if a claim in respect thereof is to be made
against an  indemnifying  party under this  Section 6,  notify the  indemnifying
party in  writing of the  commencement  thereof  and  generally  summarize  such
action.  The  indemnifying  party shall have the right to  participate in and to
assume the  defense of such claim,  jointly  with any other  indemnifying  party
similarly  noticed;  provided,  however,  that the  indemnifying  party shall be
entitled to select  counsel  for the defense of such claim with the  approval of
any  parties   entitled  to   indemnification,   which  approval  shall  not  be
unreasonably  withheld;   provided  further,   however,  that  if  either  party
reasonably  determines  that there may be a conflict  between  the  position  of
Parent and the  Investors  in  conducting  the defense of such  action,  suit or
proceeding  by reason of recognized  claims for indemnity  under this Section 6,
then  counsel  for such party  shall be  entitled  to conduct the defense to the
extent  reasonably  determined  by such  counsel to be  necessary to protect the
interest of such party. The failure to notify an indemnifying  party promptly of
the  commencement  of any such  action,  if  prejudicial  to the  ability of the
indemnifying party to defend such action, shall relieve such indemnifying party,
to the extent so  prejudiced,  of any liability to the  indemnified  party under
this  Section 6, but the omission so to notify the  indemnifying  party will not
relieve such party of any liability that such party may have to any  indemnified
party otherwise than under this Section 6.

         7. Reports Under Securities Exchange Act of 1934. With a view to making
available  to the  Investors  the  benefits  of Rule 144 and any  other  rule or
regulation  of the  Commission  that may at any time  permit an Investor to sell
securities  of  Parent to the  public  without  Registration  or  pursuant  to a
Registration on Form S-3, Parent agrees to use reasonable efforts to:

                  (a)      make and keep public information available, as those
terms are defined in Rule 144;

                  (b) file with the  Commission  in a timely  manner all reports
and other  documents  required of Parent under the  Securities  Act and the 1934
Act; and

                  (c) furnish to any Investor, so long as such Investor owns any
Registrable Securities, forthwith upon request (i) a written statement by Parent
that it has complied with the reporting requirements of Rule 144, the Securities
Act and the 1934 Act, or that it qualifies as a registrant  whose securities may
be  resold  pursuant  to Form  S-3,  (ii) a copy of the most  recent  annual  or
quarterly  report of Parent and such other  reports  and  documents  so filed by
Parent,  and (iii) such other  information  as may be  reasonably  requested  in
availing any Investor of any rule or regulation of the Commission  which permits
the selling of any such securities without registration.






         8.  Transfer of Rights.  The  Registration  rights of the Investors set
forth in Section 2 may be assigned by any Holder to a transferee  or assignee of
any  Registrable  Securities  not sold to the public  acquiring  at least  [***]
shares of such  Holder's  Registrable  Securities  (equitably  adjusted  for any
recapitalizations, stock splits, combinations, and the like) or acquiring all of
the  Registrable  Securities  held by such  Holder  if  transferred  to a single
entity; provided,  however, that (i) Parent must receive written notice prior to
the time of said  transfer,  stating the name and address of said  transferee or
assignee and identifying  the securities with respect to which such  information
and Registration rights are being assigned,  and (ii) the transferee or assignee
of such  rights  must  not be a person  deemed  in good  faith  by the  Board of
Directors  of Parent to be a  competitor  or  potential  competitor  of  Parent.
Notwithstanding  the limitation set forth in the foregoing  sentence  respecting
the minimum  number of shares which must be  transferred,  any Holder which is a
partnership  may transfer  such  Holder's  Registration  rights to such Holder's
constituent partners (or may transfer to their heirs in the case of individuals)
without  restriction  as to the number or percentage  of shares  acquired by any
such constituent partner (or heirs).

         9.       Miscellaneous.

                  9.1 Entire Agreement;  Successors and Assigns.  This Agreement
constitutes the entire contract between Parent and the Investors relative to the
subject matter hereof. Subject to the exceptions  specifically set forth in this
Agreement, the terms and conditions of this Agreement shall inure to the benefit
of  and  be  binding  upon  the  respective  executors,  administrators,  heirs,
successors and assigns of the parties.

                  9.2  Governing  Law. This  Agreement  shall be governed by and
construed in accordance  with the laws of the State of California  applicable to
contracts entered into and wholly to be performed within the State of California
by California residents.

                  9.3  Counterparts.  This  Agreement  may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  9.4 Notices.  Any notice required or permitted hereunder shall
be given in writing  and shall be  conclusively  deemed  effectively  given upon
personal delivery,  or five (5) days after deposit in the United States mail, by
first  class  mail,  postage  prepaid,  or upon  sending  if sent by  commercial
overnight  delivery  service  addressed  (i) if to  Parent,  as set forth  below
Parent's  name  on the  signature  page  of this  Agreement,  and  (ii) if to an
Investor,  at such Investor's address as set forth on the signature page of this
Agreement,  or at such other address as Parent or such Investor may designate by
ten  (10)  days'  advance   written  notice  to  the  Investors  or  to  Parent,
respectively.

                  9.5 Amendment of Agreement.  Except as otherwise  specifically
provided  herein,  any  provision of this  Agreement may be amended by a written
instrument signed by Parent and by persons holding more than fifty-five  percent
(55%)  of the  then  outstanding  Registrable  Securities  (calculated  on an as
converted basis).

                  9.6 Aggregation of Stock.  All Registrable  Securities held or
acquired by affiliated  entities or persons shall be aggregated together for the
purpose of determining the availability of any rights under this Agreement.

                  9.7  Severability.  If any provision of this Agreement is held
to be unenforceable  for any reason, it shall be adjusted rather than voided, if
possible,  in order to achieve the intent of the parties to the extent possible.
In any event,  all other  provisions of this Agreement shall be deemed valid and
enforceable to the full extent possible.






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

The PARENT:                   NEUROCRINE BIOSCIENCES, INC.

                              /s/ Paul W. Hawran
                                  Senior Vice President and
                                  Chief Financial Officer


The INVESTORS:                /s/ Susan G. Amara

                              /s/ John A. Beaulieu
                                  Manager
                                  Cascadia Pacific Management

                              /s/ Roger Cone

                              /s/ Richard Sessions

                              /s/ Sandra L. Shotwell
                                  Director, Technology Management
                                  Oregon Health Sciences University