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Phylogenetic relationship of SIVcol to other primate lentiviruses. This tree was derived by neighbor-joining analysis from a concatenated Gag-Pol-Vif-Env-Nef protein alignment. The reliability was estimated by 1,000 bootstrap replicates; only values above 75% are shown. Branch lengths are drawn to scale. Bar, 0.1 amino acid replacement per site.
