<TABLE> <S> <C>


        <S> <C>
<PAGE>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 
FORM 10-Q FOR THE PERIODS ENDED SEPTEMBER 30, AND JUNE 30, 1996 AND IS 
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS TO 
RETROACTIVELY RESTATE EARNINGS PER SHARE IN ACCORDANCE WITH THE FINANCIAL 
ACCOUNTING STANDARDS BOARD STATEMENT OF FINANCIAL ACCOUNTING STANDARDS NO. 
128, "EARNINGS PER SHARE" ("SFAS 128").
</LEGEND>
<RESTATED>
<MULTIPLIER>    1,000

<S>                        <C>                        <C>
<PERIOD-TYPE>               9-MOS                      6-MOS
<FISCAL-YEAR-END>                DEC-31-1996               DEC-31-1996
<PERIOD-START>                   JUL-01-1996               JAN-01-1996
<PERIOD-END>                     SEP-30-1996               JUN-30-1996
<CASH>                                25,448                    25,362
<SECURITIES>                               0                     2,481 <F1>
<RECEIVABLES>                              0                         0    
<ALLOWANCES>                               0                         0    
<INVENTORY>                                0                         0    
<CURRENT-ASSETS>                      25,644                    27,933    
<PP&E>                                   984                     1,019
<DEPRECIATION>                           175                       222    
<TOTAL-ASSETS>                        26,661                    28,762    
<CURRENT-LIABILITIES>                  1,128                     1,475    
<BONDS>                                    0                         0    
<PREFERRED-MANDATORY>                      0                         0    
<PREFERRED>                                0                         0    
<COMMON>                               3,713                     2,168    
<OTHER-SE>                            25,480                    27,159    
<TOTAL-LIABILITY-AND-EQUITY>          26,661                    28,762    
<SALES>                                    8                         0    
<TOTAL-REVENUES>                           8                         0    
<CGS>                                      7                         0    
<TOTAL-COSTS>                              7                         0    
<OTHER-EXPENSES>                       3,519 <F1>                2,278 <F1>
<LOSS-PROVISION>                           0                         0    
<INTEREST-EXPENSE>                       133                     (163)    
<INCOME-PRETAX>                      (5,115)                   (3,297)    
<INCOME-TAX>                               0                         0    
<INCOME-CONTINUING>                  (5,115)                   (3,297)    
<DISCONTINUED>                             0                         0    
<EXTRAORDINARY>                            0                         0    
<CHANGES>                                  0                         0    
<NET-INCOME>                         (5,115)                   (3,297)    
<EPS-PRIMARY>                         (1.38)<F2>                (1.52)<F2>
<EPS-DILUTED>                         (1.38)                    (1.52)    

<FN>
<F1> Item consists of research and development.
<F2> Item consists of basic earnings per share.
</FN>

        

</TABLE>