<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>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-2000
<PERIOD-END>                               DEC-31-1999
<CASH>                                           9,296
<SECURITIES>                                         0
<RECEIVABLES>                                      640
<ALLOWANCES>                                      (25)
<INVENTORY>                                        458
<CURRENT-ASSETS>                                10,542
<PP&E>                                           1,724
<DEPRECIATION>                                 (1,103)
<TOTAL-ASSETS>                                  11,244
<CURRENT-LIABILITIES>                              511
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           223
<OTHER-SE>                                      10,510
<TOTAL-LIABILITY-AND-EQUITY>                    11,244
<SALES>                                          1,369
<TOTAL-REVENUES>                                 2,535
<CGS>                                              775
<TOTAL-COSTS>                                    5,497
<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>                                   (2,962)
<EPS-BASIC>                                     (0.14)
<EPS-DILUTED>                                   (0.14)