Fig. 4From: Two-year cross-sectional studies reveal that single, young MSMs in Shenzhen, China are at high risk for HIV infectionPhylogenetic analysis of HIV strains identified in Shenzhen city. Neighbor-joining tree was created with partial pol genes of our sequences and the reference sequences of subtypes A-D, F-H, J, K, CRF01_AE, CRF07_BC, CRF08_BC, CRF55_01B, CRF59_01B, CRF67_01B, CRF68_01B and group O (http://hiv-web.lanl. gov/). Each reference sequence is indicated by a red line. Sequences from single, young MSMs are labeled with a blue dotBack to article page