Phylogenetic analysis of B6-Chr1KM Chr 1. (a) Fine-scale phylogenetic discordance of B6-Chr1KM Chr 1 (PP indicates posterior probability). Red represents WSB, green indicates PWK, and white represents unknown. (b) Phylogenetic tree of the WSB-derived or PWK-derived sequences of B6-Chr1KM and the wild-derived inbred mouse strain sequences. A neighbor-joining tree was generated using MEGA6 software. Red and green indicate regions supporting a single topology for KM/WSB and KM/PWK, respectively, which are both associated with a high posterior probability, as determined by BCA.