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Neighbor-joining, bootstrapped phylogenetic tree of env sequences. Sequences are colored by subject. The numbers at the nodes indicate the percentage of bootstrap replicates (100 iterations total). The subtype H reference sequence 90CF056.1 (GenBank accession number AF005496) and subtype B reference sequence HXB2 (GenBank accession number K03455.1) are labeled *1 and *2, respectively.
