[1] COLUMBIA UNIV,DEPT PATHOL,NEW YORK,NY
[2] MEM SLOAN KETTERING CANC CTR,CELL BIOL & GENET PROGRAM,NEW YORK,NY 10021
[3] IST NAZL RIC CANC,I-16132 GENOA,ITALY
[4] CORNELL MED CTR,NEW YORK HOSP,DEPT PATHOL,NEW YORK,NY
[5] UNIV SO CALIF,SCH MED,DEPT PATHOL,LOS ANGELES,CA