[1] INST PASTEUR,UNITE IMMUNOGENET CELLULARE,25 RUE DR ROUX,F-75724 PARIS 15,FRANCE
[2] SWISS INST EXPTL CANC RES,CH-1066 EPALINGES,SWITZERLAND
[3] FREE UNIV BERLIN,KLINIKUM STEGLITZ,IMMUNOL RES UNIT,D-1000 BERLIN 45,FED REP GER
[4] UNIV MIAMI,SCH MED,DEPT MICROBIOL & IMMUNOL,MIAMI,FL 33152
[5] NIAID,IMMUNOL LAB,BETHESDA,MD 20205