1. National Cancer Institute, National Institute of Arthritis & Metabolic Diseases, and Clinical Center, National Institutes of Health, Bethesda, Md.
2. Medicine Branch, National Cancer Institute, National Institutes of Health, Bethesda, Md.
3. Laboratory of Experimental Pathology, National institute of Arthritis and Metabolic Diseases, National institutes of Health, Bethesda, Md.
4. Hematology Service, Clinical Pathology Department, Clinical Center, National Institutes of Health, Bethesda, Md.