Fig. 1

REGs and PSGs that were identified using PAML. (A) Twenty-one REGs in cetaceans with ω_cetaceans > ω_other mammals (adjusted p-value < 0.05). (B) GO enrichment terms for Twenty-one REGs in cetaceans. The 20 related terms in biological process are shown. (C) Evidence of positive selection across the phylogeny of mammals identified by the free-ratio and branch-site models. In the phylogenetic tree, blue represents marine mammals, and orange represents terrestrial mammals. Triangles and circles represent the free-ratio and branch-site models, respectively. The silhouette pictures are from the Internet