title: Protein evolution and the molecular clock.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005075:Biological Evolution; D003062:Codon; D005796:Genes; D006801:Humans; D008954:Models, Biological; D009154:Mutation; D011506:Proteins; D013997:Time Factors
chemical_list: D003062:Codon; D011506:Proteins