title: Molecular coevolution: DNA divergence and the maintenance of function.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004275:DNA, Ribosomal / Q000235:genetics*; D005796:Genes; D009154:Mutation; D009876:Operon; D011817:Rabbits; D014981:Xenopus
chemical_list: D004275:DNA, Ribosomal