Fig. 1From: HIV-1 genetic diversity and primary drug resistance mutations before large-scale access to antiretroviral therapy, Republic of CongoPhylogenetic relationships of 1800 unambiguously aligned nucleotide sequences representing the partial pol gene. Sequences were aligned with HIV-1 subtype/CRF reference sequences, and the phylogenetic trees were constructed with the neighbor-joining method implemented with the Clustal Program. Reference strains are in black and samples in grey. The recombined strains are indicated with an asterisk Back to article page