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. 2011 Jun 2;8:42. doi: 10.1186/1742-4690-8-42

Figure 1.

Figure 1

Phylogenetic analysis of env nucleotide sequences. The phylogenetic tree was constructed from an env nucleotide multiple sequence alignment using a maximum likelihood algorithm, as described previously [39]. The nucleotide sequences of HIV-1 AD8, 89.6, JRCSF, YU2, NL4-3 and HXB2 env genes were included for comparison. Numbers associated with each branch are bootstrap values obtained from 1000 replicates. Only values above 700 for the major branches are shown. Branch lengths are proportional to the amount of sequence divergence.