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Maximum-likelihood tree of 43 CRF07_BC Gag sequences from Xinjiang Uygur Autonomous Region of China was constructed by Bayes3.1. XJN0301 and CBJB309, XJN017 and CBJB069 are paired respectively by more than 90% bootstrap probability. ▮ represent represents P6Δ7 CRF07_BC strains.
