[1] UNIV CHICAGO,HOWARD HUGHES MED INST,DEPT MED,CHICAGO,IL 60637
[2] UNIV CHICAGO,DEPT MED,JOINT SECT HEMATOL ONCOL,CHICAGO,IL 60637
[3] UNIV CHICAGO,DEPT PHARMACOL & PHYSIOL SCI,CHICAGO,IL 60637
[4] NEW YORK STATE DEPT HLTH,ROSWELL PK MEM INST,DEPT HUMAN GENET,BUFFALO,NY 14263