1. White River Junction Veteran's Association, White River Junction, VT;
2. Department of Medicine and
3. Department of Micro/Immunology, Dartmouth Medical School, Lebanon, NH;
4. Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, Bethesda, MD; and
5. Laboratory of Immunopathology, National Institute of Allergy and Infectious Diseases, Rockville, MD