<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-31-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           3,251
<SECURITIES>                                         0
<RECEIVABLES>                                      455
<ALLOWANCES>                                        25
<INVENTORY>                                        630
<CURRENT-ASSETS>                                 4,492
<PP&E>                                           1,506
<DEPRECIATION>                                     863
<TOTAL-ASSETS>                                   5,224
<CURRENT-LIABILITIES>                              633
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           183
<OTHER-SE>                                       4,409
<TOTAL-LIABILITY-AND-EQUITY>                     5,224
<SALES>                                          1,010
<TOTAL-REVENUES>                                 2,590
<CGS>                                              689
<TOTAL-COSTS>                                    5,133
<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>                                   (2,544)
<EPS-BASIC>                                    (.14)
<EPS-DILUTED>                                    (.14)