[1] CTR CANC RES, HOWARD HUGHES MED INST, CAMBRIDGE, MA 02139 USA
[2] MIT, DEPT BIOL, CAMBRIDGE, MA 02139 USA
[3] NETHERLANDS CANC INST, DIV MOLEC GENET, 1066 CX AMSTERDAM, NETHERLANDS
[4] UNIV AMSTERDAM, DEPT BIOCHEM, AMSTERDAM, NETHERLANDS
[5] UNIV WASHINGTON, DEPT BIOL STRUCT SM70, SEATTLE, WA 98195 USA
[6] YALE UNIV, SCH MED, HOWARD HUGHES MED INST, NEW HAVEN, CT 06510 USA
[7] ELI LILLY RES LABS, LA JOLLA, CA 92037 USA
[8] TOKAI UNIV, SCH MED, DEPT DNA BIOL, KANAGAWA 213, JAPAN
[9] CENT INST EXPTL ANIM, KANAGAWA 213, JAPAN
[10] NATL JEWISH CTR IMMUNOL & RESP MED, DENVER, CO 80206 USA
[11] NEW YORK STATE DEPT HLTH, WADSWORTH CTR, ALBANY, NY 12201 USA