1. Research Laboratory, Holy Ghost Hospital, Cambridge, Mass., and the Hematology Laboratory (Tufts), Boston City Hospital, and the Department of Medicine, Tufts University Medical School, Boston.
2. Hematology Laboratory (Tufts), Boston City Hospital, and Clinical Professor of Medicine, Tufts University Sahool of Medicine, Boston, Mass.
3. National Cancer Institute, National Institute of Health, Bethesda, Md.
4. Research Laboratory, Holy Ghost Hospital, Cambridge, Mass.
5. Department of Research Pathology, Holy Ghost Hospital, Cambridge, Mass., and Senior instructor of Pathology, Tufts University School of Medicine, Boston, Mass.