<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED FINANCIAL STATEMENTS OF GENZYME DEVELOPMENT PARTNERS, L.P. FOR THE
NINE MONTHS ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CURRENCY> US DOLLARS
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<EXCHANGE-RATE> 1
<CASH> 59
<SECURITIES> 0
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 116
<PP&E> 0
<DEPRECIATION> 0
<TOTAL-ASSETS> 397
<CURRENT-LIABILITIES> 108
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 9
<TOTAL-LIABILITY-AND-EQUITY> 397
<SALES> 0
<TOTAL-REVENUES> 180
<CGS> 0
<TOTAL-COSTS> 0
<OTHER-EXPENSES> (209)
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 389
<INCOME-TAX> 0
<INCOME-CONTINUING> 389
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 389<F1>
<EPS-BASIC> 0
<EPS-DILUTED> 0
<FN>
<F1>GENZYME DEVELOPMENT PARTNERS, L.P. IS A DELAWARE LIMITED PARTNERSHIP. NET
EARNINGS OR LOSS ARE REPORTED PER PARTNERSHIP UNIT INSTEAD OF PER SHARE. THE
PARTNERSHIP RECORDED NET INCOME OF $389,000 IN THE NINE MONTHS ENDED SEPTEMBER
30, 2000 WHICH WAS ALLOCATED 1% TO THE GENERAL PARTNER AND 99% TO THE LIMITED
PARTNERS.
</FN>
</TABLE>