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Maximum likelihood phylogenetic tree of HIV-1 pol gene (protease/reverse transcriptase) performed using MEGA software (v 6). (A) Sequences analyzed during the period of 2013 through 2017 (blue, n = 846) and reference sequences (red, n = 87). The reference set of 87 sequences was downloaded from REGA v3 database. (B) Subtype C. (C) Subtype D. (D) CRF-24BG.
