<ARTICLE> 5 <CIK> 0000814576 <NAME> PAINEWEBBER R&D PARTNERS II, L.P. <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-2000 <PERIOD-END> JUN-30-2000 <CASH> 6,998 <SECURITIES> 10,002,649 <RECEIVABLES> 1,550,000 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 11,559,647 <PP&E> 0 <DEPRECIATION> 0 <TOTAL-ASSETS> 11,559,647 <CURRENT-LIABILITIES> 156,515 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 11,403,132 <TOTAL-LIABILITY-AND-EQUITY> 11,559,647 <SALES> 0 <TOTAL-REVENUES> 10,500,047 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 290,934 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 10,209,113 <INCOME-TAX> 0 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 10,209,113 <EPS-BASIC> 0 <EPS-DILUTED> 0