[1] NIAID, Viral Dis Lab, NIH, Bethesda, MD 20892 USA
[2] Univ Penn, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[3] Karolinska Inst, Microbiol & Tumorbiol Ctr, EC Concerted Act HIV Variat, S-17177 Stockholm, Sweden
[4] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[5] NYU, Med Ctr, Howard Hughes Med Inst, New York, NY 10016 USA
[6] Rockefeller Univ, Aaron Diamond AIDS Res Ctr, New York, NY 10016 USA
[7] Ctr Immunol Marseille Luminy, F-13288 Marseille, France
[8] Netherlands Red Cross, Blood Transfus Serv, Cent Lab, Dept Clin Viroimmunol, Amsterdam, Netherlands
[9] Univ Amsterdam, Expt & Clin Immunol Lab, Amsterdam, Netherlands
[10] Dana Farber Canc Inst, Dept Canc Immunol AIDS, Boston, MA 02115 USA
[11] Inst Canc Res, Chester Beatty Labs, London SW3 6JB, England