1. Division of Hematology of the Department of Medicine, Children’s Hospital Medical Center, and the Department of Pediatrics, Harvard Medical School, Boston, Mass. 02115.
2. Recipient of an International Postdoctoral Research Fellowship (1-F05-TW-1 781-02)from the U.S. Public Health Service; on temporary leave from the Department of Pediatrics, Hadassah University Hospital, Jerusalem, Israel.
3. Division of Hematology and Oncology, Children's Hospital Medical Center; Pediatrician-in-Chief. Children's Cancer Research Foundation; and Professor of Pediatrics, Harvard Medical School, Boston, Mass. 02115.