1. Blood Bank Department, Clinical Center, National Institutes of Health, Bethesda, Maryland 20205
2. Virology and Immunology Department, Southwest Foundation for Biomedical Research, San Antonio, Texas 78284
3. Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland 20205
4. Laboratory of Tumor Cell Biology, National Cancer Institute, Bethesda, Maryland 20205
5. Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20205
6. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20205