title: Dating the cenancester of organisms.
authors.forename: M
authors.initials: M
authors.lastname: Hasegawa
authors.forename: W M
authors.initials: WM
authors.lastname: Fitch
mesh_terms: D000595:Amino Acid Sequence; D019143:Evolution, Molecular; D015233:Models, Statistical; D009154:Mutation; D011506:Proteins / Q000737:chemistry* / Q000235:genetics
chemical_list: D011506:Proteins