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Phylogenetic analysis of the nucleotide sequences of nef alleles from LTNPs, AIDS patients (AIDS), and asymptomatic carriers (ACs). The phylogenetic tree was constructed by the neighbor-joining method. Symbols before hyphens indicate patient codes, and numbers or letters after hyphens specify each nef clone. Values along the branches indicate the bootstrap probability. All branch lengths are drawn in accordance with their relative genetic distances.
