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. 2014 Mar 19;9(3):e92423. doi: 10.1371/journal.pone.0092423

Figure 1. Neighbor-joining tree of HIV-1 env gp41 (n = 65) and protease (73) sequences collected in 1986.

Figure 1

The Burkino Faso sequences are identified by the prefix, BF. Sequences from mixed HIV-1/HIV-2 infections are highlighted in gray. The reference HIV-1 group M and CRF sequences, respectively, have prefixes A, B, C, D, F1, F2, G, H, J, K, and potential L to denote the subtype or sub-subtype, or number indicating which CRF they represent, i.e., 1 for CRF01, 2 for CRF02, etc. The position of the outgroup (SIV-cpz sequence) is not shown. The numbers on nodal branches represent the bootstrap values (out of 100 replicates); only values 68% or greater are shown. The scale bar indicates an evolutionary distance of 0.1 nucleotides per site. Vertical distances are for clarity only.