Fig. 3From: Characteristics of HIV-1 molecular transmission networks and drug resistance among men who have sex with men in Tianjin, China (2014–2018)X4 and R5 co-receptor tropism of HIV 384 env sequences were obtained for 436 subjects with pol sequences successfully amplified. a Co-receptor usage based on different subtypes; b co-receptor usage based on clustering. CRF circulating recombinant form, URFs unique recombinant formsBack to article page