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V1/V2 and V3 amino acid sequence analysis. The amino acid sequences were obtained from RT-PCR-amplified HIV-1 Env V1/V2 and V3 regions as described in Materials and Methods. V1/V2 and V3 alignments are compared to the clade B consensus sequence. Dots indicate residues identical to the clade B consensus, dashes indicate gaps, and X indicates uncertainty at the nucleotide level.
