[1] COLUMBIA UNIV,DEPT PATHOL,NEW YORK,NY
[2] COLUMBIA UNIV,DEPT GENET & DEV,NEW YORK,NY
[3] MEM SLOAN KETTERING CANC CTR,CELL BIOL PROGRAM,NEW YORK,NY 10021
[4] MEM SLOAN KETTERING CANC CTR,GENET PROGRAM,NEW YORK,NY 10021
[5] COLUMBIA UNIV,DEPT MICROBIOL,NEW YORK,NY