Analysis of positive selection within SYNGR2 across mammalian species using site-specific models of evolution.

For each model, the dN/dS ratio was estimated for the entire gene (dN/dS) and across each site within SYNGR2 using the corresponding gene tree. A significant likelihood ratio test (LRT) statistic indicates the model allowing positive selection (M8, ω≤1 or ω>1) is a better fit than the null model (M7, ω≤1). The number of positive selection sites (PSS) is reported for each cluster.