Fig. 2
From: Genetic characterization of HIV-1 epidemic in Anhui Province, China
The neighbour-joining phylogenetic tree was built using 486 pol sequences obtained from Anhui Province (Fig. 2a). Subtype O was used as the outgroup. The subtype reference sequences are marked as solid circles in the tree. Sequences located among different subtypes or CRFs in the NJ tree were URFs. The scale bars representing genetic distance are listed at the bottom. The two black triangles in the Fig. 2a represent the sequences of CRF01_AE and CRF07_BC, and the corresponding phylogenetic trees are shown in Figs. 2b and c