Bayesian phylogeny of Primates (human, chimpanzee, orangutan, macaque), Laurasiatheria (canine, horse, bovine) and Rodentia (mouse, rat) inferred from concatenated amino acid sequences, assuming (A) gamma-distributed rate variation across sites (rates=gamma) and rate variation across tree (covarion=yes); (B) a proportion of invariable sites combined with the gamma model (rates=invgamma) and rate variation across tree (covarion=yes); (C) gamma-distributed rate variation across sites (rates=gamma, covarion=no); (D) a proportion of invariable sites combined with the gamma model (rates=invgamma, covarion=no).