<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS FINANCIAL INFORMATION EXTRACTED FROM THE FINANCIAL
STATEMENTS FOR REPLIGEN CORPORATION AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                           4,726
<SECURITIES>                                         0
<RECEIVABLES>                                      238
<ALLOWANCES>                                      (25)
<INVENTORY>                                        671
<CURRENT-ASSETS>                                 5,765
<PP&E>                                           1,254
<DEPRECIATION>                                   (595)
<TOTAL-ASSETS>                                   6,513
<CURRENT-LIABILITIES>                              388
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           180
<OTHER-SE>                                       5,944
<TOTAL-LIABILITY-AND-EQUITY>                     6,513
<SALES>                                          1,114
<TOTAL-REVENUES>                                 2,385
<CGS>                                              480
<TOTAL-COSTS>                                    3,181
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (796)
<EPS-PRIMARY>                                    (.05)
<EPS-DILUTED>                                    (.05)