DIACRIN INC /DE/
S-3/A, 1998-05-21
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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     As filed with the Securities and Exchange Commission on May 21, 1998
    
                                            Registration Statement No. 333-47825


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ----------------------
   
                                AMENDMENT NO. 3 
                                       TO
                                    FORM S-3
                             ----------------------
    
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ----------------------

                                  DIACRIN, INC.
             (Exact name of registrant as specified in its charter)
                             ----------------------

            DELAWARE                                   22-3016912
  (State or other jurisdiction              (I.R.S. Employer Identification No.)
of incorporation or organization)


                             Building 96 13th Street
                              Charlestown Navy Yard
                              Charlestown, MA 02129
                                 (617) 242-9100
                        (Address, including zip code, and
                     telephone number, including area code,
                            of registrant's principal
                               executive offices)
                             ----------------------

                                Thomas H. Fraser
                      President and Chief Executive Officer
                                  Diacrin, Inc.
                             Building 96 13th Street
                              Charlestown Navy Yard
                              Charlestown, MA 02129
                                 (617) 242-9100
                     (Name, address, including zip code, and
                     telephone number, including area code,
                              of agent for service)

                                 with a copy to:

                             Steven D. Singer, Esq.
                                Hale and Dorr LLP
                                 60 State Street
                           Boston, Massachusetts 02109


<PAGE>

         Approximate date of commencement of proposed sale to public: As soon as
practicable after this Registration Statement becomes effective.

         If the only securities  being registered on this Form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. _

         If any of the  securities  being  registered  on  this  Form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. X
                                                                 ---
         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. _ 333-_______.

         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. _ 333-__________.

     If delivery of the  Prospectus is expected to be made pursuant to Rule 434,
please check the following box. _

         The Company hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its  effective  date until the Company  shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the  Securities  Act of 1933 or until the  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
shall determine.





<PAGE>



Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  Prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.


                                                         

<PAGE>   


   
                   SUBJECT TO COMPLETION, DATED MAY 21, 1998
    

PROSPECTUS

                                  DIACRIN, INC.


                        1,027,027 SHARES OF COMMON STOCK

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

         This  Prospectus  relates to 1,027,027  shares (the "Shares") of Common
Stock,  par  value  $.01 per  share  (the  "Common  Stock"),  of  Diacrin,  Inc.
("Diacrin"  or the  "Company").  The shares were  acquired by the persons  named
herein  (the  "Selling   Stockholders")   pursuant  to  an  exemption  from  the
registration  requirements  of the  Securities  Act of  1933,  as  amended  (the
"Securities  Act"),  provided  by  Section  4(2)  thereof.  The Shares are being
registered  by the  Company  pursuant  to the terms of a Common  Stock  Purchase
Agreement  dated February 26, 1998,  between the Company and each of the Selling
Stockholders (the "Purchase Agreement"). See "Selling Stockholders."

         The Shares may be offered by the Selling Stockholders from time to time
in  transactions  on  the  Nasdaq  National  Market  ("Nasdaq"),   in  privately
negotiated  transactions,  through  the  writing  of  options on the Shares or a
combination  of such methods of sale,  at fixed  prices that may be changed,  at
market  prices  prevailing  at the  time of  sale,  at  prices  related  to such
prevailing market prices or at negotiated prices.  The Selling  Stockholders may
effect such transactions by selling the Shares to or through broker-dealers, and
such  broker-dealers  may  receive   compensation  in  the  form  of  discounts,
concessions or commissions  from the Selling  Stockholders  or the purchasers of
the Shares for whom such broker-dealers may act as agent or to whom they sell as
principal or both (which compensation to a particular  broker-dealer might be in
excess  of  customary  commissions).  See  "Selling  Stockholders"  and "Plan of
Distribution."

         This  Prospectus  may be used  by the  Selling  Stockholders  or by any
broker-dealer  who  may  participate  in  sales  of  the  Shares.   The  Selling
Stockholders  will  pay all  commissions,  transfer  taxes  and  other  expenses
associated with the sale of the Shares by them.

         The Company will not receive any of the  proceeds  from the sale of the
Shares by the  Selling  Stockholders.  The  Company  has agreed to bear  certain
expenses  in  connection  with the  registration  and sale of the  Shares  being
offered by the Selling  Stockholders.  The Company and the Selling  Stockholders
have agreed to  indemnify  each other  against  certain  liabilities,  including
certain liabilities under the Securities Act.

   
     The Company's  Common Stock is traded on Nasdaq under the symbol "DCRN." On
May 20,  1998,  the closing sale price of the Common Stock on Nasdaq was $8.50
per share.
    
                                     - 1 -

<PAGE>



               THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE
                OF RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 6.

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



             THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
          COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
            ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY
              OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
                       THE CONTRARY IS A CRIMINAL OFFENSE.
                              ---------------------

                 The date of this Prospectus is May __, 1998.

                                      - 2 -

<PAGE>



                              AVAILABLE INFORMATION

         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in
accordance therewith files reports,  proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements  and other  information  may be  inspected  and  copied at the public
reference  facilities  maintained by the  Commission at 450 Fifth Street,  N.W.,
Room 1024,  Washington,  D.C.  20549 and at the  Commission's  regional  offices
located at Seven World Trade Center,  Suite 1300, New York, New York 10048,  and
at Citicorp  Center,  500 West Madison  Street,  Suite 1400,  Chicago,  Illinois
60661.  Copies of such materials also may be obtained from the Public  Reference
Section of the Commission at 450 Fifth Street, N.W.,  Washington,  D.C. 20549 at
prescribed rates. In addition,  reports,  proxy statements and other information
concerning  the Company can be inspected and copied at the offices of the Nasdaq
Stock Market, Inc., 1735 K Street, N.W., Washington,  D.C. 20006. The Company is
required  to  file  electronic   versions  of  certain   documents  through  the
Commission's  Electronic Data Gathering,  Analysis and Retrieval (EDGAR) system.
The  Commission  maintains  a World  Wide  Web site at  http://www.sec.gov  that
contains  reports,  proxy  and  information  statements  and  other  information
regarding registrants that file electronically with the Commission.

         The Company has filed with the Commission a  Registration  Statement on
Form S-3  (together  with all  amendments,  supplements,  exhibits and schedules
thereto, the "Registration  Statement") under the Securities Act with respect to
the  Shares  offered  hereby.  This  Prospectus  does  not  contain  all  of the
information  set  forth in the  Registration  Statement,  as  certain  items are
omitted in accordance  with the rules and  regulations  of the  Commission.  For
further information pertaining to the Company and the Shares,  reference is made
to  such  Registration  Statement.   Statements  contained  in  this  Prospectus
regarding  the contents of any agreement or other  document are not  necessarily
complete,  and in each instance  reference is made to the copy of such agreement
or  document  filed as an  exhibit  to the  Registration  Statement,  each  such
statement being qualified in all respects by such  reference.  The  Registration
Statement may be inspected without charge at the office of the Commission at 450
Fifth  Street,  N.W.,  Washington,  D.C.  20549,  and  copies of all or any part
thereof may be obtained from the Commission at prescribed rates.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following  documents  filed by the Company with the  Commission are
incorporated herein by reference:
   
         (1)      The Company's Quarterly  Report on  Form 10-Q  for the quarter
                  ended  March 31,  1998,  filed with  the Commission on May 15,
                  1998.

         (2)      The  Company's  Annual  Report on Form 10-K for the year ended
                  December  31, 1997 filed with the  Commission  on February 17,
                  1998, as amended by a Form 10-K/A filed April 22, 1998 and a 
                  Form 10-K/A filed May 8, 1998.

         (3)      The Company's  Current  Report on Form 8-K dated  February 26,
                  1998, filed with the Commission on March 6, 1998.

         (4)      The description of the Common Stock of the  Registrant,  $0.01
                  par value per share (the  "Common  Stock"),  contained  in the
                  Registrant's  Registration Statement on Form 10 filed with the
                  Commission on April 29, 1992 as amended on July 20, 1992.

                                         - 3 -
<PAGE>
     All documents filed by the Company with the Commission pursuant to Sections
13(a),  13(c),  14 or 15(d) of the  Exchange Act  subsequent  to the date of the
initial filing of the Registration  Statement of which this Prospectus is a part
and prior to the  termination  of the offering of the Shares  registered  hereby
shall be deemed to be incorporated by reference into this Prospectus and to be a
part hereof from the date of filing such documents. Any statement contained in a
document  incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or  superseded  for  purposes  of this  Prospectus  to the
extent  that a statement  contained  herein or in any other  subsequently  filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies or supersedes such  statement.  Any statement so modified or superseded
shall not be deemed,  except as so modified or superseded,  to constitute a part
of this Prospectus.

         The Company  will  provide  without  charge to each person to whom this
Prospectus is delivered,  upon written or oral request of such person, a copy of
any or all of the  foregoing  documents  incorporated  by  reference  into  this
Prospectus (without exhibits to such documents other than exhibits  specifically
incorporated  by reference  into such  documents).  All such  requests  shall be
directed to: Diacrin,  Inc.,  Building 96, 13th Street,  Charlestown  Navy Yard,
Charlestown,  MA 02129, Attention: Vice President of Finance and Administration,
Telephone: (617) 242-9100.

               SPECIAL NOTE REGARDING FORWARD-LOOKING INFORMATION

         This  Prospectus   contains   forward-looking   statements,   including
information  with respect to planned  timetables  for the  completion of ongoing
clinical trials and commencement of new clinical trials,  the planned timetables
and duration of any planned future clinical or preclinical  trials,  development
funding  expected to be received in connection  with the  Diacrin/Genzyme  joint
venture  and the  expected  sources  of  porcine  cells  used  in the  Company's
products.  For this purpose,  any statements  contained  herein (or incorporated
herein by reference) that are not statements of historical fact may be deemed to
be  forward-looking  statements.  Without  limiting  the  foregoing,  the  words
"believes",  "anticipates",  "plans",  "expects"  and  similar  expressions  are
intended to identify forward-looking statements. There are a number of important
factors that could cause actual events or the Company's actual results to differ
materially  from  those  indicated  by such  forward-looking  statements.  These
factors  include,  without  limitation,  those set forth below under the caption
"Risk Factors".


                                   THE COMPANY

     Diacrin  is  developing  transplantable  cells for the  treatment  of human
diseases which are characterized by cell dysfunction or cell death and for which
current  therapies  are  either   inadequate  or  nonexistent.   Products  under
development   for   the   treatment   of   neurological    disorders    include:
NeuroCell(TM)-PD  for Parkinson's disease and  NeuroCell(TM)-HD for Huntington's
disease,  both of which are being  developed  in a joint  venture  with  Genzyme
Corporation  ("Genzyme"),  NeuroCell(TM)-FE  for focal epilepsy,  porcine neural
cells for stroke and  intractable  pain and  spinal  cord cells for spinal  cord
injury.  Also under  development  are  hepatocytes  for alcoholic  hepatitis and
cirrhosis,  myoblasts  for  cardiac  disease and  retinal  epithelial  cells for
macular degeneration.

         In March 1995, the United States Food and Drug  Administration  ("FDA")
cleared  the Company to conduct the first ever  clinical  trial of  transplanted
porcine  cells in  humans  and in April  1995 the  Company  initiated  a Phase 1
clinical  trial to evaluate  NeuroCell  (TM)-PD for the treatment of Parkinson's
disease.  Enrollment in this 12-patient  Phase 1 clinical trial was completed in
October 1996 and patient  recruitment  in a 36-patient  pivotal Phase 2 clinical
trial of NeuroCell  (TM)-PD was 

                                     - 4 -

<PAGE>

recently  initiated.  In May 1996,  the Company
initiated  a  Phase  1  clinical  trial  to  evaluate  NeuroCell(TM)-HD  for the
treatment of Huntington's  disease. In March 1997, enrollment of all 12 patients
in the trial was  completed.  In January 1998,  the Company  initiated a Phase 1
clinical  trial to  evaluate  NeuroCell  (TM)-FE  for the  treatment  of complex
partial epileptic seizures in patients whose disease is not well-controlled with
drug therapy.

         While the  feasibility of cell  transplantation  has been  demonstrated
clinically,  widespread use of cell transplantation in clinical applications has
been  hampered  by the lack of an  adequate  supply  of human  donor  cells.  To
overcome  this  constraint,  Diacrin has  pioneered the use of porcine cells for
clinical  transplantation.  The  Company  believes  that pigs will be a reliable
source of a wide range of cell types suitable for  transplantation  into humans.
The Company has shown in  preclinical  studies and early  clinical  trials that,
under standard  immunosuppressive  regimens,  transplanted  porcine cells appear
capable of  addressing  the  functional  deficits  caused by cell damage or cell
death.

         In  addition,  Diacrin is  developing  a  proprietary  immunomodulation
technology which is exclusively  licensed to the Company from the  Massachusetts
General Hospital ("MGH").  This technology  involves the selective  treatment of
major  histocompatibility  complex ("MHC") class I antigens on cell  populations
prior to  transplantation  to prevent the patient's immune system from rejecting
the  transplanted  cells.  The  Company's  approach  would  obviate the need for
standard immunosuppressive regimens, which may leave the patient vulnerable to a
wide range of undesirable side effects,  including  susceptibility to infectious
agents and cancer.  Preclinical  studies in animal models,  including  primates,
have  demonstrated the ability of the Company's  immunomodulation  technology to
prevent rejection of transplanted porcine cells without compromising the ability
of the immune  system to protect the recipient in its normal  fashion.  Neurons,
hepatocytes   and  cardiac   myocytes   treated   with   Diacrin's   proprietary
immunomodulation  technology have been  successfully  transplanted  into animals
without  immunosuppression.  This  technology  is presently  being  evaluated in
Parkinson's disease, Huntington's disease and focal epilepsy patients as part of
Phase  1   clinical   trials  of   NeuroCell   (TM)-PD,   NeuroCell(TM)-HD   and
NeuroCell(TM)-FE,  respectively.  Phase 1 clinical  trial  results  suggest that
NeuroCell(TM)-PD treated with the Company's  immunomodulation  technology may be
effective without the use of standard immunosuppression.

         The FDA has granted orphan drug  designation for NeuroCell  (TM)-PD for
advanced Parkinson's disease and NeuroCell(TM)-HD for Huntington's disease. Each
received a designation  for use of the product with  Diacrin's  immunomodulation
technology  to  prevent  rejection  and  a  designation  for  use  without  this
technology.  Under  current  law, the first  developer to receive FDA  marketing
approval  for a  designated  orphan drug is  generally  entitled to a seven-year
exclusive marketing period in the United States.

         In September 1996, the Company and Genzyme formed  Diacrin/Genzyme  LLC
(the  "Joint   Venture"),   a  joint   venture  to  develop  and   commercialize
NeuroCell(TM)-PD and NeuroCell(TM)-HD (the "Joint Venture Products").  Under the
terms, and subject to certain conditions, of the joint venture agreement,  which
was effective  October 1, 1996,  Genzyme has agreed to provide 100% of the first
$10 million in funding and 75% of the  following  $40 million in funding for the
development and  commercialization  of the Joint Venture  Products.  The Company
agreed to provide the remaining 25% of the following $40 million in funding. All
costs incurred in excess of $50 million are to be shared equally between Genzyme
and the Company in accordance  with the terms of the  agreement.  Any profits of
the Joint Venture are to be shared equally by the two parties. The Joint Venture
plans that Diacrin and Genzyme will perform, on behalf of the Joint Venture, the

                                     - 5 -

<PAGE>

development  activities in connection  with the Joint Venture  Products and that
Genzyme will market and sell the Joint Venture Products on a cost  reimbursement
basis on behalf of the Joint Venture.

     In addition to  NeuroCell(TM)-PD,  NeuroCell(TM)-HD  and  NeuroCell(TM)-FE,
Diacrin has seven other products in various  stages of preclinical  development:
(i) porcine  hepatocytes  for alcoholic  hepatitis;  (ii) human  hepatocytes for
cirrhosis;  (iii) human  myoblasts  for cardiac  disease;  (iv) neural cells for
stroke; (v) neural cells for intractable pain; (vi) spinal cord cells for spinal
cord injury and (vii) retinal epithelial cells for macular degeneration.

         The Company was incorporated under the laws of the State of Delaware in
1989 and commenced operations in 1990. The Company's principal executive offices
are located at Charlestown Navy Yard,  Building 96,  Charlestown,  Massachusetts
02129 and its telephone number if (617) 242-9100.

                              RECENT DEVELOPMENTS

     On April 21, 1998, the Company announced  financial results for the quarter
ended March 31, 1998.  The selected  financial  data set forth below as of March
31, 1998 and for the three months ended March 31, 1997 and 1998 is unaudited.
<TABLE>
<CAPTION>

                                                             DIACRIN, INC.
                                                        SELECTED FINANCIAL DATA

                                                                        Three Months Ended March 31, 
Statement of Operations Data:                                            1998                 1997
<S>                                                               <C>                     <C>
REVENUES:
   Research and development                                          $  1,142,746            $  1,191,326
   Interest income                                                        351,185                 331,396
                                                                  ----------------        -----------------
         Total revenues                                                 1,493,931               1,522,722
                                                                  ----------------        -----------------

OPERATING EXPENSES:
   Research and development                                             1,839,443               1,611,269
   General and administrative                                             402,177                 411,480
   Interest expense                                                        26,438                  18,846
                                                                  ----------------        -----------------
         Total operating expenses                                       2,268,058               2,041,595
                                                                  ----------------        -----------------

EQUITY IN OPERATIONS OF JOINT VENTURE                                      54,989                       -
                                                                  ----------------        -----------------

NET LOSS                                                             $   (829,116)           $   (518,873)             
                                                                  ================        =================

NET LOSS PER COMMON SHARE                                            $       (.06)           $       (.04)     
                                                                  ================        =================

SHARES USED IN COMPUTING NET LOSS PER COMMON SHARE                     13,657,209              13,192,471
                                                                  ================        =================

Balance Sheet Data:                                                 March 31, 1998         December 31, 1997
                                                                    --------------         -----------------
Cash, cash equivalents and investments                               $ 29,977,718             $ 21,347,164
Total assets                                                           31,284,712               22,779,793
Long-term debt                                                            581,805                  672,426
Stockholders' equity                                                   28,821,694               20,203,668

</TABLE>


                                  RISK FACTORS

         The Shares  offered hereby involve a high degree of risk. The following
risk factors should be considered carefully in addition to the other information
included or incorporated by reference in this Prospectus  before  purchasing the
Shares offered hereby.

Reliance on Joint Venture with Genzyme Corporation
- --------------------------------------------------

         The  Company  and  Genzyme  are  parties to a joint  venture  agreement
relating to the  development  and  commercialization  of  NeuroCell  (TM)-PD and
NeuroCell(TM)-HD,  the Company's  most advanced  product  candidates.  Under the
agreement,  Genzyme  has  agreed to  provide  the first $10  million  of product
development and commercialization funding required after October 1, 1996 for the
Joint  Venture  Products,  75% of the next $40  million  of  funding  and 50% of
funding thereafter. In addition, Genzyme has agreed to market and sell the Joint
Venture Products on behalf of the Joint Venture.  Furthermore, the Joint Venture
plans to  manufacture  the Joint Venture  Products in  facilities  controlled by
Genzyme.

         Genzyme has the right, at any time after it has contributed $10 million
of funding,  to terminate the joint venture  agreement,  without cause, upon 180
days notice to Diacrin. In the event of such termination,  the Company (i) would
lose  a  significant  source  of  funding  for  the   NeuroCell(TM)-PD  and  the
NeuroCell(TM)-HD  product  development  programs,  (ii)  would  lose  access  to
Genzyme's   experienced   sales,   marketing,   development  and   manufacturing
organizations,  and (iii) would need to establish clinical production facilities
for the production of the Joint Venture Products. There can be no assurance that
the  Company  would be able to  complete  development  or  commercialization  of
NeuroCell (TM)-PD and  NeuroCell(TM)-HD  if Genzyme terminated the joint venture
agreement.

         In  addition,  under  certain  circumstances,  Genzyme has the right to
terminate the joint venture agreement  following an unremedied breach by Diacrin
of any material term of the agreement. In the event of such termination, Genzyme
has the option to obtain an  exclusive,  worldwide,  royalty-bearing  license to
certain Diacrin technology  required to manufacture and market the Joint Venture
Products.  If Genzyme  exercised  its option,  the Company  would be entitled to
receive a royalty on the net sales of the Joint Venture Products,  which royalty
may be significantly  less than amounts the Company would be entitled to receive
under the 50%/50% profit split agreed to as part of the joint venture agreement.

                                     - 6 -

<PAGE>

         Any termination of the joint venture  agreement,  whether by Genzyme or
Diacrin, could have a material adverse effect on the Company's business, results
of operations or financial position. In addition, there can be no assurance that
the economic and other interests of the Company and Genzyme will coincide during
the term of the joint  venture  agreement or that  disagreements  will not occur
between  the Company and  Genzyme  during the term of the  agreement,  either of
which could have a material adverse effect on the Company's business, results of
operations or financial position. See "- - Dependence on Others."

Reliance on Cell Transplantation Technology; No Currently Approved 
- ------------------------------------------------------------------
Xenotransplantation-Based Products; PERV Testing
- ------------------------------------------------

         Diacrin has concentrated  its efforts and therapeutic  product research
on its cell  transplantation  technology and will be dependent on the successful
development of the technology.  Cell  transplantation  technology is an emerging
technology  with,  as  yet,  limited  clinical  applications.  There  can  be no
assurance that the Company's cell transplantation  technology will result in the
development  of any  therapeutic  products.  If it does not,  the Company may be
required  to  change  dramatically  the  scope  and  direction  of  its  product
development activities.

         The   Company's   approach   involves    xenotransplantation   --   the
transplantation  of cells  from  one  species  into  another.  Although  several
companies  are  focusing  on  this  area,   xenotransplantation-based   products
represent  a  novel  therapeutic  approach  that  has not yet  been  subject  to
extensive clinical testing.  Xenotransplantation  also poses a risk that viruses
or other animal pathogens may be unintentionally transmitted to a human patient.
The  Company  is  aware  of  recent  scientific  publications  by  others  which
demonstrate,  under laboratory conditions,  that porcine endogenous retroviruses
("PERV")  have the  potential  to  infect  human  cells.  In  response  to these
findings,  the Company has been required by the FDA to perform  certain tests to
determine  whether PERV is present in patients that have received porcine cells.
These tests have been  performed  on samples  from  patients  who have  received
NeuroCell  (TM)-PD  and no  PERV  was  detected  in  these  samples.  Given  the
satisfactory results of those tests, the FDA cleared the Company to proceed with
its planned clinical trials in NeuroCell(TM)-PD and NeuroCell(TM)-FE in December
1997. The Company has also been required by the FDA to perform  additional tests
on porcine neural cells to determine if infectious PERV is present.  These tests
have been  performed and no PERV was detected.  The Company has been required by
the FDA to develop an  additional  test for the  detection  of PERV and has been
instructed to routinely  monitor patient blood samples for the presence of PERV.
If PERV is detected in this test or samples, additional tests may be required to
assess the risk to  patients of PERV  infection.  If such  additional  tests are
required,  trials of the Company's  porcine cell products may be delayed.  While
PERV has not been  shown to cause any  disease  in pigs,  it is not  known  what
effect,  if any,  PERV may have on human  beings.  The  Company's  porcine  cell
product  development  programs would be negatively  impacted by the detection of
infectious  PERV in porcine cells or clinical  trial  subjects.  An inability to
proceed with further trials or a substantial  delay in the clinical trials would
have a material adverse effect on the Company.

         No xenotransplantation-based  therapeutic product has been approved for
sale  by the  FDA.  The  FDA  has  not  yet  established  definitive  regulatory
guidelines for xenotransplantation, but has proposed guidelines in an attempt to
reduce  the  risk  of  contamination  of  transplanted  cellular  products  with
infectious  agents.  Diacrin has provided the FDA with a written response to the
proposed  guidelines,  however,  there can be no assurance that such  guidelines
will be issued,  or that  Diacrin  will be able to comply with final  guidelines
that may be issued.  Furthermore,  there can be no  assurance  that any products
developed  and  tested by  Diacrin  will be  approved  by the FDA or

                                     - 7 -

<PAGE>

regulatory
authorities  in other  countries,  or that  xenotransplantation-based  products,
including  the  Company's  product  candidates,  will be accepted by the medical
community or third-party  payers or that the degree of acceptance will not limit
the size of the market for such products.

History of Operating Losses; No Assurance of Revenue or Operating Profit
- ------------------------------------------------------------------------

         The  Company  has  generated  no revenue  from  product  sales to date.
Diacrin has accumulated  net losses from its inception in 1989 through  December
31, 1997 of approximately $34.7 million, and losses are continuing.  The Company
expects to incur substantial  operating losses for the foreseeable  future.  The
Company expects that the Joint Venture's 1998 product development plans together
with  the  Company's   commencement   of  funding  of  the  Joint  Venture  will
significantly increase the Company's net loss in 1998 as compared with 1997. The
Company  currently  has no material  sources of revenue  from  product  sales or
license fees, and there can be no assurance that it will be able to develop such
revenue  sources or that its operations  will become  profitable,  even if it is
able to commercialize any products.

Lack of Commercial Products; No Assurance of Successful Product Development
- ---------------------------------------------------------------------------

         The Company has no products  available  for sale and does not expect to
have any  therapeutic  products  commercially  available  for at least  the next
several  years,  if at  all.  The  Company's  potential  products  will  require
significant additional development, preclinical and clinical testing, regulatory
approval and additional  investment  prior to  commercialization.  The Company's
potential  therapeutic  products are at early stages of research and development
and  the  Company's  growth  will  depend  on  the  successful  development  and
commercialization  of its  products.  There  can be no  assurance  that any such
potential  products  will  be  successfully  developed,  prove  to be  safe  and
efficacious in clinical trials, meet applicable regulatory standards, be capable
of  being  produced  in  commercial   quantities  at  acceptable   costs  or  be
successfully marketed.

Need for Substantial Additional Funds
- -------------------------------------

         The  Company  will  require  substantial  additional  funding  for  its
research  and product  development  programs  and  operating  expenses,  and for
pursuing regulatory  clearances and building production  capabilities.  Adequate
funds for these purposes,  whether  obtained  through equity or debt financings,
collaborative  or other  arrangements  with  corporate  partners  or from  other
sources, may not be available when needed or on terms acceptable to the Company.
Insufficient  funds may require the  Company to delay,  scale back or  eliminate
certain  of  its  product   development   programs  or  to  license   others  to
commercialize  products or technologies that the Company would otherwise seek to
develop and  commercialize  itself,  any of which would have a material  adverse
effect on the Company.

Uncertainty Associated with Preclinical and Clinical Testing
- ------------------------------------------------------------

         Before obtaining regulatory approvals for the commercial sale of any of
the Company's  potential  products,  the products will be subjected to extensive
preclinical  and clinical  testing to  demonstrate  their safety and efficacy in
humans.   To   date,   the   Company   has   administered   NeuroCell   (TM)-PD,
NeuroCell(TM)-HD and NeuroCell (TM)-FE to an aggregate of 25 patients in Phase 1
human clinical  trials.  Results of initial  preclinical and clinical testing of
products  under  development  by the Company are not  necessarily  predictive of
results that will be obtained from subsequent or more extensive  preclinical and
clinical testing. Furthermore, there can be no assurance that clinical trials of
products  under  development  will  demonstrate  the safety and efficacy

                                     - 8 -

<PAGE>

of such
products  at all or to the  extent  necessary  to obtain  regulatory  approvals.
Companies in the biotechnology  industry have suffered  significant  setbacks in
advanced clinical trials,  even after promising  results in earlier trials.  The
failure to  adequately  demonstrate  the safety and  efficacy  of a  therapeutic
product  under  development  could delay or prevent  regulatory  approval of the
product and would have a material adverse effect on the Company.

         The rate of  completion  of clinical  trials is dependent  upon,  among
other factors, the enrollment of patients. Patient accrual is a function of many
factors, including the size of the patient population, the proximity of patients
to clinical sites,  the eligibility  criteria for the study and the existence of
competitive  clinical  trials.  Delays  in  planned  patient  enrollment  in the
Company's  current  clinical  trial or  future  clinical  trials  may  result in
increased  costs,  program delays or both,  which could have a material  adverse
effect on the Company.

No Assurance of FDA Approval; Government Regulation
- ---------------------------------------------------

         The FDA and comparable  government agencies in foreign countries impose
substantial  regulations  on the  manufacture  and  marketing of  pharmaceutical
products   through  lengthy  and  detailed   laboratory  and  clinical   testing
procedures,  sampling activities and other costly and time-consuming procedures.
Satisfaction  of these  regulations  typically  takes  several years or more and
varies substantially based upon the type, complexity and novelty of the proposed
product.  The Company cannot yet  accurately  predict when it might first submit
any Product License Application ("PLA") or Biologics License Application ("BLA")
for FDA or other regulatory approval.

         The effect of government  regulation  may be to delay  marketing of new
products for a  considerable  or  indefinite  period of time,  to impose  costly
procedures  upon the  Company's  activities  or to  diminish  or  eliminate  any
competitive  advantage the Company may enjoy. There can be no assurance that FDA
or other regulatory  approval for any products  developed by the Company will be
granted on a timely basis, if at all. Any such delay in obtaining, or failure to
obtain,  such approvals  could  adversely  affect the marketing of the Company's
products and the ability to generate product revenue.  The extent of potentially
adverse  government  regulation  which might arise from  future  legislation  or
administrative action cannot be predicted.

         If regulatory  approval of a product is obtained,  such approval may be
conditioned  upon  limitations and restrictions on the product use. In addition,
any marketed product and its manufacturer are subject to continuing governmental
review and any subsequent  discovery of previously  unrecognized  problems could
result in  restrictions  on the  product  or  manufacturer,  including,  without
limitation, withdrawal of the product from the market. Failure of the Company to
comply with applicable  regulatory  requirements can, among other things, result
in fines,  suspension  of  regulatory  approvals,  product  recalls,  seizure of
products, operating restrictions or civil or criminal prosecution.

         Additionally,  the Company is or may become subject to various federal,
state and local laws,  regulations and recommendations  relating to safe working
conditions,  laboratory and  manufacturing  practices,  the  experimental use of
animals  and  the  use  and  disposal  of  hazardous  or  potentially  hazardous
substances,  including radioactive compounds and infectious disease agents, used
in connection with the Company's  research and development  work. The Company is
unable  to  predict  the  extent  of  restrictions  that  might  arise  from any
governmental or administrative  action.  There can also be no assurance that the
Company  will  not be  required  to  incur  significant  costs  to  comply  with
environmental  laws and  regulations,  or any  assurance  that  the  operations,
business or assets of

                                     - 9 -

<PAGE>

the Company will not be materially  adversely  affected by
current or future environmental laws or regulations.

Rapid Technological Changes; Competition
- ----------------------------------------

         The Company is engaged in  activities in the  biopharmaceutical  field,
which is  characterized by extensive  research  efforts and rapid  technological
progress.  There can be no  assurance  that  research and  discoveries  by other
biotechnology or pharmaceutical companies will not render the Company's programs
or products uneconomical,  result in therapies superior to any therapy developed
by the Company or that any  products  developed by the Company will be preferred
to any existing or newly-developed technologies.

         The  biotechnology and  pharmaceutical  industries are characterized by
intense  competition.  The Company competes against numerous companies,  many of
which have substantially greater financial and other resources than the Company.
Several such enterprises have initiated cell  transplantation  research programs
and/or  efforts  to treat the same  diseases  targeted  by the  Company  through
alternate  technologies.  These competitive  enterprises have devoted,  and will
continue  to  devote,   substantial   resources  to  the   development  of  cell
transplantation  or other  products to treat such  diseases.  Private and public
academic and research institutions also compete with Diacrin in the research and
development of human therapeutic products.

         In  addition,  many of the  Company's  competitors  have  significantly
greater  experience  than the Company in preclinical  testing and human clinical
trials of  biotechnology  and  pharmaceutical  products and in obtaining FDA and
other regulatory approvals of products.  Accordingly,  the Company's competitors
may succeed in obtaining FDA approval for products  more rapidly or  effectively
than the Company. If the Company commences  significant  commercial sales of its
products, it will also be competing with respect to manufacturing efficiency and
sales and marketing capabilities, areas in which it has no experience.

Limited Regulatory, Manufacturing, Marketing and Sales Capabilities
- -------------------------------------------------------------------

         The  Company  has  not  yet  invested   significantly   in  regulatory,
manufacturing,  marketing, distribution or product sales resources. To date, the
Company  has  relied on others for the  supply  and  production  of pigs for its
clinical  programs.   Although  the  Company  intends  to  develop   regulatory,
manufacturing,  marketing, distribution and sales resources in the future, there
can be no  assurance  that the Company  will be able to develop  such  resources
successfully.

Uncertain Ability to Protect Proprietary Technology; Reliance Upon Licenses
- ---------------------------------------------------------------------------

         The  biotechnology  and  pharmaceutical  industries place  considerable
importance on obtaining patent and trade secret protection for new technologies,
products and  processes.  The  Company's  success will depend,  in part,  on its
ability to obtain patent protection for its products, preserve its trade secrets
and operate without infringing the proprietary rights of others. The Company has
ongoing  research  efforts and expects to seek additional  patents covering this
research in the future.  There can be no assurance of its success or  timeliness
in obtaining  any patents,  or of the breadth or degree of  protection  that any
such patents will afford the Company.

         The patent position of biotechnology products is often highly uncertain
and  usually  involves  complex  legal and  factual  questions.  There can be no
assurance that patent applications  relating to the Company's potential products
or technology will result in additional patents being issued or

                                     - 10 -

<PAGE>

that, if issued,
such  patents  will  afford  adequate  protection  to  the  Company  or  not  be
challenged,  invalidated  or infringed.  Furthermore,  there can be no assurance
that others will not  independently  develop  similar  products  and  processes,
duplicate  any of the  Company's  products  or,  if  patents  are  issued to the
Company,  design  around such  patents.  In  addition,  the Company  could incur
substantial costs in defending itself in suits brought against it or in suits in
which it may assert  its  patents  against  others.  If the  outcome of any such
litigation is unfavorable,  the Company's business could be adversely  affected.
To  determine  the  priority  of  inventions,  the  Company  may  also  have  to
participate in interference proceedings declared by the United States Patent and
Trademark Office, which could result in substantial cost to the Company.

         Much of the Company's  know-how and  technology is not  patentable.  To
protect its rights,  the Company requires all employees,  consultants,  advisors
and collaborators to enter into confidentiality  agreements with Diacrin.  There
can be no assurance,  however,  that these  agreements  will provide  meaningful
protection  for the  Company's  trade  secrets,  know-how  or other  proprietary
information in the event of any unauthorized use or disclosure.  Further, in the
absence of patent  protection,  the Company's business may be adversely affected
by competitors who independently develop substantially equivalent technology.

Uncertain Availability of Third-Party Reimbursement and Product Pricing
- -----------------------------------------------------------------------

     The Company's  ability to commercialize  products  successfully will depend
substantially  on  reimbursement  of the  costs  of such  products  and  related
treatments at acceptable  levels from  government  authorities,  private  health
insurers  and  other  organizations,  such as health  maintenance  organizations
("HMOs").  There can be no assurance that  reimbursement in the United States or
foreign countries will be available for any products the Company may develop or,
if available, will not be decreased in the future, or that reimbursement amounts
will not reduce the demand for, or the price of, the Company's products, thereby
adversely affecting the Company's business.

         Third-party payers are increasingly  challenging the prices charged for
medical products and services. Also, the trend toward managed health care in the
United States and the concurrent  growth of  organizations,  such as HMOs, which
can control or significantly  influence the purchase of health care services and
products,  as well as  legislative  proposals  to reform  health  care or reduce
government  insurance  programs,  may  result in lower  prices  for  therapeutic
products.   The  cost  containment  measures  that  health  care  providers  are
instituting,  including practice protocols and guidelines and clinical pathways,
and the effect of any health care reform,  could materially adversely affect the
Company's  ability to sell its products if successfully  developed and approved.
Moreover,  the  Company  is unable to predict  what  additional  legislation  or
regulation, if any, relating to the health care industry or third-party coverage
and  reimbursement  may be enacted in the future or what effect such legislation
or regulation would have on the Company's business.

Dependence on Key Personnel
- ---------------------------

         Because  of the  specialized  nature of its  business,  the  Company is
highly dependent on its ability to attract and retain  qualified  scientific and
technical  personnel for the research and  development  activities  conducted or
sponsored by the Company.  The loss of certain key executive  officers  could be
significantly  detrimental to the Company.  Recruiting  and retaining  qualified
scientific personnel to perform research and development work is critical to the
Company's success. In addition,  the Company's  anticipated growth and expansion
into areas and  activities  requiring  additional  expertise,  such as  clinical
testing,  regulatory compliance,  manufacturing and marketing,  will require the
addition of new management personnel and the development of additional expertise

                                     - 11 -

<PAGE>

by existing  management  personnel.  There is intense  competition for qualified
personnel  in the  areas  of  the  Company's  activities,  and  there  can be no
assurance  that the  Company  will be able to continue to attract and retain the
qualified personnel  necessary for the development of its business.  The failure
to  attract  and  retain  such  personnel  or to develop  such  expertise  would
adversely affect the Company's business.

Dependence on Others
- --------------------

         The Company's  strategy for  development and  commercialization  of its
product candidates  entails entering into arrangements with corporate  partners,
collaborators,  licensees  and others and upon the  subsequent  success of these
third parties in performing their  obligations,  including,  as the case may be,
any or all of preclinical and clinical testing,  obtaining regulatory approvals,
manufacturing and marketing.  There can be no assurance that the Company will be
able to maintain its existing arrangements or establish additional collaborative
arrangements on favorable terms, if at all. If the Company is able to enter into
any  additional  arrangements,  such  arrangements  may  require  the Company to
transfer certain material rights to third parties.

         There  can  be  no  assurance   that  any  such   corporate   partners,
collaborators, licensees or others will perform their obligations as expected or
that the Company  will derive any revenue or profit from any  existing or future
arrangements. While the Company believes its partners, collaborators,  licensees
and others  will have an  economic  motivation  to succeed in  performing  their
contractual  responsibilities,  the amount and timing of resources to be devoted
by such parties is not within the control of the Company. Furthermore, there can
be no assurance  that the interest of the Company  will  coincide  with those of
such other  parties or that  disagreements  over rights to  technology  or other
proprietary  information  or other  matters will not occur.  In addition,  it is
possible  that  such  other  parties  will  be  independently  involved  in  the
development  of products  that may be  competitive  with the  products  they are
developing in collaboration with the Company.  If any of the Company's partners,
collaborators, licensees or others breaches or terminates its agreement with the
Company  or  otherwise  fails to conduct  its  required  activities  in a timely
manner, the development or commercialization of the product candidate under such
collaborative agreement may be delayed, the Company may be required to undertake
unforeseen additional responsibilities or devote unforeseen additional resources
to   such   development   or    commercialization   or   such   development   or
commercialization could be terminated. Any such event could adversely effect the
Company's business, results of operations or financial position.

Potential Product Liability; Limited Product Liability Insurance
- ----------------------------------------------------------------

         The testing, marketing and sale of human health care products entail an
inherent risk of product  liability  claims,  and there can be no assurance that
substantial  product  liability claims will not be asserted against the Company.
The Company has limited product liability insurance and may need to increase its
coverage as it expands human clinical trials and if and when it begins to market
products.  There can be no assurance  that adequate  insurance  coverage will be
available on  acceptable  terms,  if at all, or that a product  liability  claim
would not materially adversely affect the business or financial condition of the
Company.

Possible Price Volatility of Common Stock
- -----------------------------------------

         The market prices for  securities of  biopharmaceutical  companies have
been highly  volatile.  The  announcement  of  technological  innovations or new
commercial products by the Company or its competitors, the impact of health care
reform, developments relating to regulatory matters or to 

                                     - 12 -

<PAGE>

patents or proprietary
rights,  publicity  regarding  actual or potential  clinical  trial results with
respect  to  products  under  development  by the  Company  or others as well as
period-to-period  variances in financial results could cause the market price of
the Common Stock to fluctuate  substantially.  In addition, the stock market has
experienced  extreme  price  and  volume  fluctuations  that  have  particularly
affected the market price for many high technology companies and that have often
been  unrelated to the operating  performance  of these  companies.  These broad
market fluctuations may adversely affect the market price of the Common Stock.


                                 USE OF PROCEEDS

         The Company will not receive any  proceeds  from the sale of the Shares
by the Selling Stockholders.

         The  Company  will  bear  all  costs  (excluding  any  brokerage  fees,
underwriting  discounts  and selling  commissions  and expenses  incurred by the
Selling Stockholders for legal services in excess of $7,500),  fees and expenses
incurred in effecting the registration of the Shares covered by this Prospectus,
including,  without limitation,  all registration and filing fees required under
federal and state  securities laws, fees and expenses of counsel for the Company
and fees and expenses of accountants for the Company.


                              SELLING STOCKHOLDERS

     The following  table sets forth,  to the knowledge of the Company,  certain
information  regarding the beneficial  ownership of Common Stock of each Selling
Stockholder  as of March 31,  1998 and as adjusted to give effect to the sale of
the Shares  offered  hereby.  The Shares are being  registered  to permit public
secondary  trading of the  Shares,  and the Selling  Stockholders  may offer the
Shares for resale from time to time.

     On February 26, 1998,  the Company  issued  1,027,027  shares of its Common
Stock in a private placement to the three entities  identified herein as Selling
Stockholders.  The  shares  were sold at a  purchase  price of $9.25 per  share,
resulting in aggregate gross proceeds to the Company of $9,500,000.  The Company
intends to use the net proceeds from the sale of the shares to fund research and
development and preclinical and clinical testing of potential products,  to fund
the  Company's  commitments  to  Diacrin/Genzyme  LLC and for general  corporate
purposes.  All of the Shares  being  offered by the  Selling  Stockholders  were
acquired by them from the Company in private placement  transactions pursuant to
an exemption from the  registration  requirements of the Securities Act provided
by Section 4(2) thereof. The Shares are being registered by the Company pursuant
to the terms of the Purchase Agreement.  In the Purchase Agreement,  the Company
has agreed,  among other things, to bear certain expenses in connection with the
registration  and sale of the Shares being offered by the Selling  Stockholders.
See "Plan of Distribution."

         Each Selling Stockholders represented in the Purchase Agreement that it
was  acquiring  the  Shares for  investment  and with no  present  intention  of
distributing any of such Shares. In recognition of the fact that investors, even
though  purchasing  Common Stock without a view to distribution,  may wish to be
legally permitted to sell publicly their Shares when they deem appropriate,  the
Company has filed with the Commission,  under the Securities Act, a Registration
Statement on Form S-3, of which this  Prospectus  forms a part,  with respect to
the  resale of the Shares  from time to time and has agreed to prepare  and file
such  amendments  and  supplements  to  the  Registration  Statement  as  may be
necessary to keep the Registration  Statement effective until February 26, 2000.
See "Plan of Distribution."

                                     - 13 -

<PAGE>

<TABLE>

<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                    Percentage of
                                      Number of          Percentage of                            Number of           Shares of
                                      Shares of            Shares of                              Shares of            Common
                                    Common Stock         Common Stock         Number of          Common Stock           Stock
        Name of Selling             Beneficially         Beneficially         Shares of          Beneficially       Beneficially
          Stockholder                Owned Prior        Owned Prior to       Common Stock        Owned After         Owned after
                                   to Offering(1)       Offering (1)(2)     Offered Hereby      Offering(1)(2)     Offering (1)(2)
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                                <C>                    <C>                 <C>                 <C>                  <C>    
Hudson Trust(3)                    1,229,680              8.6%                540,541             689,139              4.8%
c/o Summit Asset Management
Co., Inc.
666 Plainsboro Road
Suite 445
Plainsboro, New Jersey 08536

Rho Management Trust II (4)        1,592,887              11.1%               378,378             1,214,509            8.5%
c/o Rho Management
Company, Inc.
767 Fifth Avenue
43rd Floor
New York, New York 10153

Kaufman Family LLC (5)                 188,108                1.3%                108,108             80,000               *
660 Madison Avenue
15th Floor
New York, New York 10021

</TABLE>

- --------------------
* Less than one percent of the number of shares of Common Stock outstanding.

(1)  The  number  of  Shares   beneficially  owned  is  determined  under  rules
     promulgated  by the  Commission,  and the  information  is not  necessarily
     indicative of beneficial ownership for any other purpose.  Unless otherwise
     indicated,  the Selling  Stockholders have sole voting power and investment
     power  with  respect  to  all  Shares   listed  as  owned  by  the  Selling
     Stockholders.

(2)  It is unknown if, when or in what amounts a Selling  Stockholder  may offer
     Shares for sale and there can be no assurance that the Selling Stockholders
     will sell any or all of the Shares  offered  hereby.  Because  the  Selling
     Stockholders may offer all or some of the Shares pursuant to this Offering,
     and  because   there  are   currently  no   agreements,   arrangements   or
     understandings  with  respect to the sale of any of the Shares that will be
     held by the Selling  Stockholders  after  completion  of the  Offering,  no
     estimate  can be given as to the amount of the Shares  that will be held by
     the Selling  Stockholders  after completion of the Offering.  However,  for
     purposes of this table,  the Company has assumed that,  after completion of
     the Offering, none of the Shares covered hereby will be held by the Selling
     Stockholders.  

(3)  Hudson Trust may be considered to be controlled by Bernd Diethelm  Honer, a
     German citizen,  who as sole grantor of Hudson Trust  exercises  investment
     and voting authority over shares owned by Hudson Trust.  Excludes shares of
     Common Stock held by HealthCare  Ventures II, L.P.  ("HCV II"),  HealthCare
     Ventures IV, L.P. ("HCV IV"), and HealthCare  Partners II, L.P. ("HCP II").
     HCV II and HCV IV are  shareholders  of the Company.  HCP II is the general
     partner  of  HCV  II,  and as  such,  may be  deemed  additionally  to be a
     beneficial  owner of  shares  in the  Company.  Hudson  Trust is a  limited
     partner of each of HCV II, HCV IV and HCP II.

(4)  Rho Management Partners,  L.P. exercises investment and voting control over
     the shares  owned by Rho  Management  Trust II.  Joshua  Ruch, a citizen of
     South Africa and U.S. resident, may be considered the controlling person of
     Rho Management Partners L.P. Excludes shares of Common Stock held by HCV II
     and HCV IV and described in Note (3). Rho Management  Trust II is a limited
     partner of each of HCV II and HCV IV.

(5)  Henry  Kaufman,  a U.S.  citizen and resident,  may be considered to be the
     controlling person of Kaufman Family LLC.

                                     - 14 -

<PAGE>

                              PLAN OF DISTRIBUTION

         The Company has been  advised  that the Selling  Stockholders  may sell
Shares from time to time in  transactions  on Nasdaq,  in  privately  negotiated
transactions,  through the writing of options on the shares or a combination  of
such methods of sale,  at fixed prices  which may be changed,  at market  prices
prevailing  at the time of sale,  at prices  related to such  prevailing  market
prices or at  negotiated  prices.  The  Selling  Stockholders  may  effect  such
transactions  by  selling  the  Shares to or  through  broker-dealers,  and such
broker-dealers may receive compensation in the form of discounts, concessions or
commissions  from the Selling  Stockholders  or the purchasers of the Shares for
whom such broker-dealers may act as agent or to whom they sell as principal,  or
both (which  compensation  to a particular  broker-dealer  might be in excess of
customary  commissions).  The Shares may be sold by one or a combination  of the
following:  (a) a block  trade in which the  broker or  dealer so  engaged  will
attempt to sell the Shares as agent,  but may  position  and resell a portion of
the block as principal to facilitate the transaction;  (b) purchases by a broker
or dealer as  principal  and  resale by such  broker or dealer  for its  account
pursuant to this Prospectus; (c) an over-the-counter  distribution in accordance
with  the  rules  of  the  Nasdaq  National  Market;   (d)  ordinary   brokerage
transactions and transactions in which the broker solicits  purchasers;  and (e)
in privately  negotiated  transactions.  In connection with distributions of the
Shares or otherwise, any Selling Stockholder may enter into hedging transactions
with  broker-dealers  and the  broker-dealers  may engage in short  sales of the
Shares in the course of hedging the  positions  they  assume  with such  Selling
Stockholder.  Any Selling  Stockholder  also may sell  Shares  short and deliver
Shares to close out such short positions. Any Selling Stockholder also may enter
into option or other transactions with  broker-dealers that involve the delivery
of the Shares to the broker-dealers, which may then resell or otherwise transfer
such  Shares.  Any Selling  Stockholder  also may loan or pledge the Shares to a
broker-dealer  or other  financial  institution may sell the Shares so loaned or
upon a default may sell or otherwise transfer the pledged Shares.

         The Selling  Stockholders and any  broker-dealers who act in connection
with the sale of Shares hereunder may be deemed to be "underwriters" as the term
is defined in the Securities Act and any commissions  received by them as profit
or any  resale of the  Shares as  principal  might be deemed to be  underwriting
discounts or commissions under the Securities Act.

         The Company and the Selling  Stockholders have agreed to indemnify each
other against  certain  liabilities,  including  certain  liabilities  under the
Securities Act.

                                  LEGAL MATTERS

         The validity of the Shares  offered  hereby will be passed upon for the
Company by Hale and Dorr LLP.

                                     EXPERTS

         The financial  statements  incorporated by reference in this prospectus
and elsewhere in the registration statement have been audited by Arthur Andersen
LLP,  independent public accountants,  as indicated in their report with respect
thereto,  and are included herein in reliance upon the authority of said firm as
experts in giving said report.


                                     - 15 -

<PAGE>






         No person has been authorized to give
any information or to make any representations
other than those contained in this Prospectus
and, if given or made, such  information or
representations must not be relied upon as                       DIACRIN, INC.
having been authorized by the Company or the
Selling Stockholders.  This Prospectus does not
constitute an offer to sell or a solicitation of any
offer to buy to any person in any jurisdiction in               1,027,027 Shares
which such offer or solicitation of an offer or                   Common Stock
solicitation would be unlawful.   Neither the
delivery of this Prospectus nor any offer or sale
hereunder shall, under any circumstances, create
any implication that there has been no change
in the affairs of the Company or that the
information contained herein is correct as of any
date hereof.
         ---------------

        TABLE OF CONTENTS
                                                  Page           --------------
Available Information.......................       3
Incorporation of Certain Documents                                 PROSPECTUS
  By Reference..............................       3
Special Note Regarding Forward-Looking                           --------------
  Information...............................       4              
The Company.................................       4
   
Recent Developments.........................       6
    
Risk Factors................................       6
Use of Proceeds.............................       13
Selling Stockholders........................       13
Plan of Distribution........................       15
Legal Matters...............................       15
Experts.....................................       15             May __, 1998
<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14.  Other Expenses of Issuance and Distribution.
- ------------------------------------------------------

The following table sets forth the various expenses to be incurred in connection
with the sale and distribution of the securities being registered hereby, all of
which will be borne by the  Company  (except  expenses  incurred  by the Selling
Stockholders for brokerage fees, selling commissions, underwriting discounts and
fees and disbursements of counsel to the Selling Stockholders exceeding $7,500).
All amounts shown are estimates  except the Securities  and Exchange  Commission
registration fee.


Filing Fee - Securities and Exchange Commission                $2,900

Legal fees and expenses of the Company                         $5,000

Accounting fees and expenses                                   $1,000

Miscellaneous expenses                                         $1,100


                                                               ------
         Total Expenses                                        $10,000
                                                               ======

Item 15.  Indemnification of Directors and Officers.
- ----------------------------------------------------

         Section 145 of the General  Corporation Law of Delaware provides that a
corporation has the power to indemnify a director, officer, employee or agent of
the  corporation  and  certain  other  persons  serving  at the  request  of the
corporation in related  capacities against amounts paid and expenses incurred in
connection  with an action or  proceeding  to which he is or is threatened to be
made a party by reason of such position, if such person shall have acted in good
faith and in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation,  and, in any criminal  proceeding,  if such person
had no reasonable  cause to believe his conduct was unlawful;  provided that, in
the  case  of  actions  brought  by or in  the  right  of  the  corporation,  no
indemnification shall be made with respect to any matter as to which such person
shall have been adjudged to be liable to the corporation  unless and only to the
extent that the  adjudicating  court  determines  that such  indemnification  is
proper under the circumstances.

         Article ELEVENTH of the Registrant's  Amended and Restated  Certificate
of Incorporation provides that a director or officer of the Registrant (a) shall
be  indemnified  by the Registrant  against all expenses  (including  attorney's
fees),  judgments,  fines and amounts paid in settlement  reasonably incurred in
connection with any litigation or other legal  proceeding  (other than an action
by or in the  right of the  Registrant)  brought  against  him by  virtue of his
position  as a director  or officer if he acted in good faith and in a manner he
reasonable  believed  to be in or not  opposed  to  the  best  interests  of the
Registrant,  and,  with respect to any  criminal  action or  proceeding,  had no
reasonable  cause  to  believe  his  conduct  was  unlawful,  and (b)  shall  be
indemnified by the Registrant against expenses  (including  attorney's fees) and
amounts paid in settlement  reasonably incurred in connection with any action by
or in the right of the  Registrant  by virtue of his  position  as a director or
officer  of the  Registrant  if he  acted  in  good  faith  and in a  manner  he
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
Registrant,  except that no  indemnification  shall be made with  respect to any
such matter as to which such  director or officer shall have been adjudged to be
liable to the Registrant,  unless and only to the extent that a court determines
that, despite the adjudication of liability but in view of all the circumstances
of the case, such person is fairly and reasonably entitled 

                                    - II-1 -

<PAGE>

to indemnity for such
expenses as the court deems proper. Notwithstanding the foregoing, to the extent
that a director or officer has been successful,  on the merits or otherwise,  he
shall be indemnified against all expenses (including attorney's fees) reasonably
incurred by him in connection therewith.  Expenses incurred in defending a civil
or criminal action,  suit or proceeding shall be advanced by the Registrant to a
director or officer,  at his  request,  upon  receipt of an  undertaking  by the
director or officer to repay such amount if it is ultimately  determined that he
is not entitled to indemnification.

         Indemnification is required to be made unless the Registrant determines
(in  the  manner   provided  in  its  Amended  and   Restated   Certificate   of
Incorporation)   that  the   applicable   standard  of  conduct   required   for
indemnification  has not  been  met.  In the  event  of a  determination  by the
Registrant that the director or officer did not meet the applicable  standard of
conduct  required for  indemnification,  or if the  Registrant  fails to make an
indemnification  payment  within 60 days after  such  payment is claimed by such
person,  such person is  permitted  to  petition a court to make an  independent
determination  as to whether  such person is entitled to  indemnification.  As a
condition  precedent  to the right of  indemnification,  the director or officer
must give the Registrant  notice of the action for which indemnity is sought and
the Registrant has the right to participate in such action or assume the defense
thereof.

         Article ELEVENTH of the Registrant's  Amended and Restated  Certificate
of Incorporation  further provides that the indemnification  provided therein is
not exclusive,  and provides that in the event that the General  Corporation Law
of Delaware is amended to expand the  indemnification  permitted to officers and
directors,  the Registrant  must  indemnify  those persons to the fullest extent
permitted by such law as so amended.

         The Company has purchased a general  liability  insurance  policy which
covers certain  liabilities of directors and officers of the Company arising out
of claims based on acts or omissions in their capacity as directors or officers.

         Article SEVENTH of the Registrant's Amended and Restated Certificate of
Incorporation  provides that, except to the extent that the General  Corporation
Law of Delaware prohibits the elimination of liability of directors for breaches
of fiduciary duty, no director of the Registrant  shall be personally  liable to
the  Registrant  or its  stockholders  for  monetary  damages  for any breach of
fiduciary duty as a director.


Item 16.          Exhibits
- --------------------------

EXHIBIT
NUMBER                                               DESCRIPTION
   
    5.1**         Opinion of Hale and Dorr LLP

    23.1*         Consent of Arthur Andersen LLP

    23.2**        Consent of Hale and Dorr LLP, included in Exhibit 5.1 filed 
                  herewith.

    24.1*         Power of Attorney 

*  Previously filed.

** Filed herewith.
    
                                    - II-2 -

<PAGE>


Item 17.  Undertakings.
- -----------------------

         The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this Registration Statement:

                  (i)  To include any prospectus required by Section 10(a)(3) of
         the Securities Act of 1933, as amended (the "Securities Act");

                  (ii) To reflect in the  prospectus any facts or events arising
         after the effective  date of this  Registration  Statement (or the most
         recent post-effective amendment thereof) which,  individually or in the
         aggregate,  represent a fundamental change in the information set forth
         in this  Registration  Statement.  Notwithstanding  the foregoing,  any
         increase or decrease in the volume of securities  offered (if the total
         dollar  value of  securities  offered  would not exceed  that which was
         registered)  and  any  derivation  from  the  low  or  high  and of the
         estimated  maximum  offering  range  may be  reflected  in the  form of
         prospectus filed with the Commission pursuant to Rule 424(b) if, in the
         aggregate,  the changes in volume and price  represent  no more than 20
         percent change in the maximum aggregate offering price set forth in the
         "Calculation of Registration  Fee" table in the effective  Registration
         Statement; and

                  (iii) To include any material  information with respect to the
         plan of  distribution  not  previously  disclosed in this  Registration
         Statement  or  any  material   change  to  such   information  in  this
         Registration Statement.

         (2) That,  for the  purposes of  determining  any  liability  under the
Securities Act, each post-effective amendment that contains a form of prospectus
shall be deemed to be a new  registration  statement  relating to the securities
offered therein, and the offering of such securities at the time shall be deemed
to be the initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         The Registrant  hereby undertakes that, for purposes of determining any
liability  under the  Securities  Act,  each filing of the  Registrant's  annual
report  pursuant  to  Section  13(a) or 15(d) of the  Exchange  Act of 1934,  as
amended (the "Exchange Act") (and, where applicable,  each filing of an employee
benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that
is incorporated by reference in this  Registration  Statement shall be deemed to
be a new registration  statement  relating to the securities offered therein and
the  offering of such  securities  at the time shall be deemed to be the initial
bona fide offering thereof.

         Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant  pursuant to the  indemnification  provisions  described  herein,  or
otherwise, the Registrant has been advised that in the opinion of the Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Securities Act and is, therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities Act and will be governed by the final adjudication of such issue.

                                    - II-3 -

<PAGE>

                                   SIGNATURES
   
     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Amendment No. 3 to Registration Statement to be signed on its behalf
by  the  undersigned,   thereunto  duly  authorized,  in  the  City  of  Boston,
Commonwealth of Massachusetts, on this 21st day of May, 1998.
    

                                                    DIACRIN, INC.



                                             By: /s/ Thomas H. Fraser
                                                 -------------------------
                                                 Thomas H. Fraser
                                                 President and Chief Executive 
                                                 Officer
   
     Pursuant to the  requirements of the Securities Act of 1933, this Amendment
No. 3 to Registration  Statement has been signed by the following persons in the
capacities and on the date indicated.
    
<TABLE>
<CAPTION>

       Signature                                         Title                                   Date
       ---------                                         -----                                   ----    

   
<S>                                       <C>                                                <C>
/s/ Thomas H. Fraser                      President, Chief Executive Officer and             May 21, 1998
- ----------------------                    Director (Principal Executive Officer)
    Thomas H. Fraser




/s/ Mark J. Fitzpatrick                   Vice President of Finance and                      May 21, 1998
- -----------------------                   Administration, Chief Financial Officer and
    Mark J. Fitzpatrick                   Treasurer (Principal Financial and
                                          Accounting Officer)



               *                           Director                                           May 21, 1998
- -----------------------
    Zola P. Horovitz

               *                           Director                                           May 21, 1998
- -----------------------
    John W. Littlechild

                                    - II-4 -

<PAGE>


                                           Director                                           
- -------------------------
    Stelios Papadopoulous



               *                           Director                                           May 21, 1998
- -----------------------
    Henri A. Termeer



               *                          Director                                            May 21, 1998
- -------------------------
    Christopher T. Walsh

* Mark J. Fitzpatrick, Attorney-in-Fact
    


</TABLE>
                                                        
                                    - II-5 -





                                HALE AND DORR LLP
                               Counsellors at Law
                                 60 State Street
                           Boston, Massachusetts 02109
                         617-516-6000 * Fax 616-526-5000

                                   May 21, 1998


Diacrin, Inc.
Building 96, 13th Street
Charlestown Navy Yard
Charlestown, Massachusetts  02129

         Re:      Registration Statement on Form S-3

Ladies and Gentlemen:

         This  opinion is  furnished to you in  connection  with a  Registration
Statement on Form S-3 (File No. 333-47825) (the "Registration  Statement") filed
with the  Securities  and  Exchange  Commission  (the  "Commission")  under  the
Securities Act of 1933, as amended (the "Securities  Act"), for the registration
of an aggregate of 1,027,027  shares of Common  Stock,  $.01 par value per share
(the "Shares"), of Diacrin, Inc., a Delaware corporation (the "Company"). All of
the Shares are being registered on behalf of certain stockholders of the Company
(the "Selling Stockholders").

         We have  acted  as  counsel  for the  Company  in  connection  with the
registration  for resale of the Shares.  We have  examined  signed copies of the
Registration  Statement  and  all  exhibits  thereto,  all  as  filed  with  the
Commission. We have also examined and relied upon the minutes of meetings of the
stockholders  and the Board of Directors of the Company as provided to us by the
Company,  stock record books of the Company as provided to us by the Company,  a
copy of the  Certificate of  Incorporation  and By-Laws of the Company,  each as
restated  and/or  amended to date,  and such other  documents  as we have deemed
necessary for purposes of rendering the opinions hereinafter set forth.

         In our  examination  of the  foregoing  documents,  we have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to original documents of all documents submitted to
us as copies, the authenticity of the originals of such latter documents and the
legal competence of all signatories to such documents.

WASHINGTON, DC                    BOSTON, MA                         LONDON, UK*


              HALE AND DORR LLP INCLUDES PROFESSIONAL CORPORATIONS
  *BROBECK HALE AND DORR INTERNATIONAL (IN INDEPENDENT JOINT VENTURE LAW FIRM)

<PAGE>

         We assume that the appropriate action will be taken, prior to the offer
and sale of the Shares,  to  register  and qualify the Shares for sale under all
applicable state securities or "blue sky" laws.

         For purposes of our opinion below as to full payment for the Shares, we
have relied solely on a certificate of an officer of the Company.

     We express no  opinion  herein as to the laws of any state or  jurisdiction
other than the state laws of the Commonwealth of Massachusetts,  the corporation
law of the  State of  Delaware  and the  federal  laws of the  United  States of
America.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares  have  been  duly  authorized  and are  validly  issued,  fully  paid and
nonassessable.

         This  opinion  is  based  upon  currently  existing  statutes,   rules,
regulations and judicial decisions, and we disclaim any obligation to advise you
of any  change in any of these  sources  of law or  subsequent  legal or factual
developments which might affect any matters or opinions set forth herein.

         Please note that we are opining  only as to the matters  expressly  set
forth herein,  and no opinion should be inferred as to any other  matters.  This
opinion is rendered solely in connection with the Registration Statement and may
not be quoted or relied upon by any other person or used for any other  purpose,
without our prior written consent.

         We hereby  consent to the filing of this opinion with the Commission as
an exhibit to the Registration  Statement in accordance with the requirements of
Item  601(b)(5) of Regulation S-K under the Securities Act and to the use of our
name therein and in the related Prospectus under the caption "Legal Matters." In
giving  such  consent,  we do not hereby  admit that we are in the  category  of
persons whose consent is required  under Section 7 of the  Securities Act or the
rules and regulations of the Commission.

                                                              Very truly yours,



                                                              HALE AND DORR LLP




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