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Nucleotide diversity of 3 distinct HIV-1 variants responsible for HIV-1 epidemic among MSM in China. Nucleotide diversity of CRF01_AE clusters 1 and 2 and of CRF07_BC cluster 3 are shown in comparison with other CRF01_AE and CRF07_BC strains circulating among MSM in China. Asterisks (*) indicate a statistically significant difference (P < 0.01) in nucleotide diversity between 2 indicated categories.
