[1] Univ Ulm, Inst Virol, Ulm, Germany
[2] Univ Alabama, Dept Med, Birmingham, PA USA
[3] Univ Alabama, Dept Microbiol, Birmingham, PA USA
[4] Inst Pasteur, Unite Biol Retrovirus, Paris, France
[5] Emory Univ, Yerkes Reg Primate Res Ctr, Atlanta, GA 30322 USA
[6] Inst Rech Dev, Retrovirus Lab, Montpellier, France
[7] Univ Nottingham, Queens Med Ctr, Inst Genet, Nottingham NG7 2RD, England
[8] Ctr Int Rech Med, Dept Virol, Franceville, Gabon
[9] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[10] Univ Penn, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA