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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MARCH 31,
2000 FORM 10-Q/A AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-2000
<PERIOD-END> MAR-31-2000
<CASH> 29,891,732
<SECURITIES> 22,461,839
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 54,209,771
<PP&E> 16,580,220
<DEPRECIATION> 11,959,891
<TOTAL-ASSETS> 93,799,203
<CURRENT-LIABILITIES> 11,174,268
<BONDS> 0
0
2,366,625
<COMMON> 230,194,315
<OTHER-SE> (152,169,389)
<TOTAL-LIABILITY-AND-EQUITY> 93,799,203
<SALES> 0
<TOTAL-REVENUES> 0
<CGS> 0
<TOTAL-COSTS> 11,354,969
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 195,838
<INCOME-PRETAX> (11,195,468)
<INCOME-TAX> 0
<INCOME-CONTINUING> 0
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (11,195,468)
<EPS-BASIC> (.58)
<EPS-DILUTED> (.58)
</TABLE>
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