FIG. 1.

Phylogenetic relationship of the env gene C2V3 coding region from clone 97cn54 with the representatives of the major HIV-1 (group M) subtypes. cn-con-c represents the env consensus sequence of HIV-1 subtype C strains prevalent in China. The phylogenetic tree was constructed using the neighbor-joining method. Values at the nodes indicate the percent bootstraps in which the cluster to the right was supported. Bootstraps of 70% and higher only are shown. Brackets on the right represent the major subtype sequences of HIV-1 group M.