1. L. C. Jacobson Blood Center, Scripps Clinic and Research Foundation, La Jolla, Calif. 92037.
2. L. C. Jacobson Blood Center, Scripps Clinic and Research Foundation, La Jolla, Calif 92037.
3. Blood Bank, St. Luke's Hospital Center; Assistant Professor of Medicine, Columbia University College of Physicians and Surgeons, New York, N. Y. 10025.
4. L. C. Jacobson Blood Center, Head, Division of Hematology, Scripps Clinic and Research Foundation, La Jolla, Calif. 92037.