Maximum clade credibility (MCC) tree representing the rooted genealogy of HCV sutypes 1a, 6a, 6n and 6u among HIV/HCV coinfected IDUs in Yunnan.

<p>(A) The MCC tree for subtype 1a strains. (B) The MCC tree for subtype 6a strains. (C) The MCC tree for subtype 6n strains. (D) The MCC tree for subtype 6u strains. The MCC trees were obtained by Bayesian MCMC analysis based on partial <i>NS5B</i> gene (H77: 8340–9233) implemented in BEAST v 1.7.4. The uncorrelated exponential relaxed molecular clock method was used in combination with the Bayesian Skyline coalescent tree prior under GTR+I+G4 nucleotide substitution model. The branch lengths in the MCC trees reflect time and the corresponding time-scale is shown at the bottom of the trees. The posterior probabilities of the key nodes and the tMRCA medians for the interested nodes are indicated.