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Phylogenetic relationships of HIV-2 strains ARM and SAR to other HIV-2 and SIV strains. The highest-likelihood tree is shown for alignments based on the coding regions spanning V2 to the carboxy terminus of gp120, encompassing 973 nucleotides of HIV-2 and SIV. One hundred unrooted trees were generated. The scale bar represents 10 substitutions per 100 nucleotides.
