Figure 2: Evolution of gene clusters among mammals.

(a) Phylogeny and the distribution of gene clusters among the mammals. (b) Orthologs shared between rodents (mouse and rat, red colour), ruminates (TA and cow, blue colour), primates (human, chimpanzee and macaque, dark turquoise colour) and non-Artiodactyla laurasiatherians (horse and dog, orange colour) on the basis of a representative gene in at least one of the grouped species. (c) Protein identity between other mammals and humans for strictly conserved single-copy orthologs.