title: Composition drift in the cytochrome c cistron.
mesh_terms: D000225:Adenine / Q000032:analysis; D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D003574:Cytochrome c Group / Q000096:biosynthesis*; D005787:Gene Frequency; D005815:Genetic Code; D006801:Humans; D008954:Models, Biological; D009711:Nucleotides / Q000032:analysis; D010163:Paleontology; D012333:RNA, Messenger / Q000032:analysis*
chemical_list: D003574:Cytochrome c Group; D009711:Nucleotides; D012333:RNA, Messenger; D000225:Adenine