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Bayesian MCMC phylogenetic trees of the resistant lineages compared to 100 HIV-1 pol sequences after exclusion of 59 codon positions associated with drug resistance (a) or based on third-codon positions only (b). Branch lengths are expressed as the number of nucleotide substitutions per site. Boxes indicate the position of the five resistant clusters in the trees. Nodes with a posterior probability of 1.00 are labeled with a star.
