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. 2014 Apr 30;9(4):e95183. doi: 10.1371/journal.pone.0095183

Figure 1. V3–V5 phylogenetic tree of HIV-1 strains from 72 HIV-1-infected patients in South Africa and Swaziland.

Figure 1

Tree was rooted by using the midpoint rooting method. Scale bar at the bottom indicates 7% nucleotide substitutions per site. The asterisk along a branch represents the bootstrap value (significant statistical support) >70% and p<0.001 in the zero-branch-length test. Years of collection of samples are color-highlighted: 2005 in blue, 2006 in red and 2007 in green. Country where sample collection was performed: SW  =  Swaziland; SA  =  South Africa.