1. Laboratory of Experimental Pathology NIAMD, Laboratory of Clinical Investigation, NIAID, National Institutes of Health, Bethesda, Maryland and Department of Medicine, University of California Medical Center, San Francisco, California.
2. Section of Hematology and immunology, Department of Medicine, University of California Medical Center, San Francisco, Calif.
3. Department of Medicine, University of California Medical Center, San Francisco, Calif.
4. Division of Medical Genetics, Department of Medicine, Mt. Sinai School of Medicine, New York, N. Y.
5. Department of Medicine, University of Rochester School of Medicine, Rochester, N. Y.
6. Department of Pathology, Vanderbilt University School of Medicine, Nashville, Tenn.