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Phylogenetic tree analysis of seven near full-length CRF07_BC sequences. A neighbor-joining tree of seven reference sequences (retrieved from the HIV database) was constructed by using Mega 5.2; seven new sequences (▲) were clustered with CRF07_BC reference strains with 100% bootstrap probability. It should be noticed that two Sichuan strains and one Xinjiang strain (713) also formed a clade with 100% bootstrap probability.
