Fig. 1

The phylogenetic tree of HIV-1 pol sequences obtained from Sichuan. The maximum-likelihood tree obtained using 1062 bp corresponded to the protease region and part of the reverse transcriptase. A total of 675 HIV-1 sequences branched with CRF07_BC reference sequences (depicted in blue). 342 HIV-1 query sequences branched with CRF01_AE reference sequences (depicted in red). 115 HIV-1 CRF08_BC query sequences were identified (depicted in light blue). 67 HIV-1 CRF85_BC query sequences were identified (depicted in brown). 36 query sequences clustered with HIV-1 subtype B reference sequences (depicted in yellow). Other subtypes and URFs were not depicted color. The reference sequences from the Los Alamos HIV sequence database (http://hiv-web.lanl.gov/content/index)