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. Author manuscript; available in PMC: 2008 Dec 8.
Published in final edited form as: J Infect Dis. 2001 Sep 10;184(8):998–1006. doi: 10.1086/323601

Figure 1.

Figure 1

Neighbor-joining trees constructed from reverse-transcriptase and protease sequences from 117 completely sequenced human immunodeficiency virus type 1 genomes. Trees were constructed with the HKY85 nucleotide-substitution model, with a Γ distribution to allow for site variation in substitution rate. Bootstrap values are shown at ancestral nodes of each subtype and circulating recombinant form. Branches with asterisks represent isolates that were complex recombinants and incidental variants not included in the bootstrap analysis. The scale bar represents a 10% nucleotide difference.