1. Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD;
2. Leukemia Service, Memorial Sloan Kettering Cancer Center, Weill Cornell Medical College, New York, NY;
3. Department of Haematology, Medical University of Lodz and Copernicus Memorial Hospital, Lodz, Poland;
4. Division of Hematology, Stanford University School of Medicine, Stanford, CA;
5. Metabolism Branch and
6. Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD; and
7. MedImmune, Gaithersburg, MD