[1] WEIZMANN INST SCI,DEPT BIOPHYS,IL-76100 REHOVOT,ISRAEL
[2] NYU MED CTR,DEPT MICROBIOL,DIV PARASITOL,NEW YORK,NY 10016
[3] ROCKEFELLER UNIV,PARASITOL LAB,NEW YORK,NY 10021
[4] ST GEORGES HOSP,SCH MED,DEPT IMMUNOL,LONDON SW17 0RE,ENGLAND
[5] ROCKEFELLER FDN,NEW YORK,NY 10036
[6] UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195
[7] INST VENEZOLANO INVEST CIENT,IMMUNOBIOL LAB,CARACAS 1010A,VENEZUELA
[8] ROCKEFELLER UNIV,CELLULAR PHYSIOL & IMMUNOL,NEW YORK,NY 10021
[9] UNIV CAMBRIDGE,DEPT PATHOL,CAMBRIDGE CB2 1QP,ENGLAND
[10] UNIV CENT VENEZUELA,FAC CIENCIAS,CARACAS 1041,VENEZUELA
[11] WELLCOME RES LABS,DEPT BIOCHEM PARASITOL,BECKENHAM BR3 3BS,KENT,ENGLAND
[12] INST POLITECN NACL,CTR INVEST AVANZADOS,DEPT BIOL CELULAR,MEXICO CITY 14,MEXICO