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Genetic variation of HIV type 1 in four World Health Organization-sponsored vaccine evaluation sites: generation of functional envelope (glycoprotein 160) clones representative of sequence subtypes A, B, C, and E. WHO Network for HIV Isolation and Characterization.
Gao F, Yue L, Craig S, Thornton CL, Robertson DL, McCutchan FE, Bradac JA, Sharp PM, Hahn BH. Gao F, et al. AIDS Res Hum Retroviruses. 1994 Nov;10(11):1359-68. doi: 10.1089/aid.1994.10.1359. AIDS Res Hum Retroviruses. 1994. PMID: 7888189