[1] Rockefeller Univ, Aaron Diamond AIDS Res Ctr, New York, NY 10021 USA
[2] Rockefeller Univ, Lab Retrovirol, New York, NY 10021 USA
[3] SAIC Frederick Inc, AIDs & Canc Virus Program, Frederick Natl Lab, Frederick, MD USA
[4] SAIC Frederick Inc, Lab Anim Sci Program, Frederick Natl Lab, Frederick, MD USA
[5] NCI, HIV Drug Resistance Program, Frederick, MD 21701 USA
[6] Rockefeller Univ, Howard Hughes Med Inst, New York, NY 10021 USA