FIG. 3.

Evolutionary relationship between Liangshan HIV-1 CRF07_BC sequences from the IDU population and those from other areas in China depicted on a maximum likelihood tree of the full-length gag–pol gene (A) and partial gag gene (B). (A) Full-length gag–pol sequences representing CRF07_BC from several areas were identified in the laboratory or obtained from the database (http://hiv-web.lanl. gov/) and used for comparison with the sequences generated in this study. Each reference sequence is labeled using the same color used in Fig. 1. The branch support values (more than 70%) are indicated at the corresponding nodes of the tree. The subtree containing clusters is illustrated at the right of the original tree. (B) The ML tree based on partial CRF07_BC gag sequences representing CRF07_BC from several areas is constructed to illustrate the evolutionary relationship between strains from Liangshan prefecture and Xinjiang province. The subtree containing clusters is illustrated accordingly. Color images available online at www.liebertpub.com/aid