<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)