[1] ROCKEFELLER UNIV, NEW YORK, NY 10021 USA
[2] HOWARD HUGHES MED INST, NEW YORK, NY 10021 USA
[3] WALTER & ELIZA HALL INST MED RES, MELBOURNE, VIC 3050, AUSTRALIA
[4] JOHNS HOPKINS UNIV, SCH MED, DEPT MOLEC BIOL & GENET, BALTIMORE, MD 21205 USA
[5] WHITEHEAD INST BIOMED RES, CAMBRIDGE, MA 02142 USA
[6] NATL JEWISH CTR IMMUNOL & RESP MED, DEPT PEDIAT, DENVER, CO 80206 USA
[7] FOX CHASE CANC CTR, INST CANC RES, PHILADELPHIA, PA 19111 USA