Fig. 3
From: HIV-1 diversity in infected individuals in Suzhou and Suqian, China
The phylogenetic tree of pol and vif-env fragments of HIV-1 strains isolated from Suqian and Suzhou was constructed with MEGA 5.0 using the neighbor-joining method. The subtype references were download from Los Alamos HIV Sequence Database. A China subtype B strain RL42 (U71182) was also used as a subtype reference. The stability of the nodes was assessed by bootstrap analyses with 1000 replications and only bootstrap values of more than 75 are shown at the corresponding nodes. The bootscanning plots of pol and vif-env fragments of HIV-1 intersubtype recombinants were shown in the each part. There was one BC recombinant to be embedded within the clade of subtype B. The main reason is that the recombinant comprises a genetic backbone of subtype B with a short insertion of subtype C. The too short insertion with few effective information sites from subtype C did not chance the phylogeny of the recombinant