1. Medical Branch, National Cancer Institute, National Institutes of Health, and Clinical Pathology, Clinical Center, National Institutes of Health, Bethesda, Maryland.
2. Medicine Branch, National Cancer Institute, National Institutes of health, Bethesda, Maryland; present address: Institut de Pathologic Cellulaire, Hospital de Bicétre,94 -L Kremlin Bicétre,France.
3. Clinical Center, National Institutes of Health, Bethesda, Maryland; present address: Oscar B. Hunter Memorial Laboratory, Washington, D. C.
4. Medicne Branch National Cancer institute, National institutes of Health, Bethesda, Maryliind.
5. Medicine Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland; present address: Chief, Section of Applied Molecular Biology, M. D. Anderson Hospital & Tumor institute, Houston, Texas.