<ARTICLE>      5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED FINANCIAL STATEMENTS OF T CELL SCIENCES, INC. FOR THE SIX MONTHS ENDED
JUNE 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CURRENCY>     U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                       5,217,400
<SECURITIES>                                         0
<RECEIVABLES>                                    6,400
<ALLOWANCES>                                         0
<INVENTORY>                                        100
<CURRENT-ASSETS>                             6,664,000
<PP&E>                                       3,092,800
<DEPRECIATION>                             (2,750,900)
<TOTAL-ASSETS>                               9,836,300
<CURRENT-LIABILITIES>                        1,940,800
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        28,500
<OTHER-SE>                                   7,117,000
<TOTAL-LIABILITY-AND-EQUITY>                 9,836,300
<SALES>                                         35,000
<TOTAL-REVENUES>                               670,900
<CGS>                                           17,900
<TOTAL-COSTS>                                3,764,600
<OTHER-EXPENSES>                             (185,600)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           (210,000)
<INCOME-PRETAX>                            (2,716,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (2,716,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (2,716,000)
<EPS-PRIMARY>                                   (0.10)
<EPS-DILUTED>                                   (0.10)