Positive Selection and the Evolution of izumo Genes in Mammals
Figure 2
Izumo genes phylogenies. Molecular phylogenetic relationships of mammalian species within izumo1 (a), izumo2 (b), izumo3 (c), and izumo4 (d) emphasizing the formation of common clades between orthologs (superorder Laurasiatheria, clade (grandorder) Glires, and order Primates). The evolutionary history was inferred by using Maximum Likelihood and different JTT substitution models (see Table 1). The trees are drawn to scale, with branch lengths measured as the number of amino acid substitutions per site. The reliability of the tree branching was assessed using 1,000 replicate bootstraps. Bootstrap values lower than 50 are not shown.
