1. HIV Immunology and Diagnostics Branch and HIV and Retrovirology Branch, Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
2. Center on AIDS and Other Medical Consequences of Drug Abuse, National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland.
3. Project SIDA, Kinshasa, Democratic Republic of Congo.
4. Institute of Tropical Medicine, Antwerp 2000, Belgium.
5. AIDS Program, National Center for HIV, STD, and TB Prevention, CDC, Atlanta, Georgia 30333.
6. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland 21205.