[1] INST PASTEUR,UNITE GENET MOLEC MURINE,F-75724 PARIS 15,FRANCE
[2] MRC,RADIOBIOL UNIT,DIDCOT OX11 ORD,OXON,ENGLAND
[3] DEPT MOLEC & CELLULAR BIOL,BUFFALO,NY 14263
[4] CLIN RES CTR,COMPARAT BIOL SECT,HARROW HA1 3UJ,MIDDX,ENGLAND
[5] IMPERIAL CANC RES FUND,LONDON WC2A 3PX,ENGLAND
[6] NIAID,IMMUNOL LAB,BETHESDA,MD 20892
[7] INST MOLEC GENET,HOUSTON,TX 77030