<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED FINANCIAL STATEMENTS OF T CELL SCIENCES, INC. FOR THE NINE MONTHS
ENDED SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                              JAN-1-1997
<PERIOD-END>                               SEP-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                       8,538,000
<SECURITIES>                                         0
<RECEIVABLES>                                   19,400
<ALLOWANCES>                                         0
<INVENTORY>                                      5,200
<CURRENT-ASSETS>                             9,037,300
<PP&E>                                       3,096,700
<DEPRECIATION>                             (2,692,800)
<TOTAL-ASSETS>                              11,503,500
<CURRENT-LIABILITIES>                        2,268,200
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        25,000
<OTHER-SE>                                   7,710,300
<TOTAL-LIABILITY-AND-EQUITY>                11,503,500
<SALES>                                         36,200
<TOTAL-REVENUES>                               840,100
<CGS>                                           17,200
<TOTAL-COSTS>                                6,813,200
<OTHER-EXPENSES>                             6,127,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           (470,700)
<INCOME-PRETAX>                           (11,646,600)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (11,646,600)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (11,646,600)
<EPS-PRIMARY>                                   (0.47)
<EPS-DILUTED>                                   (0.47)