title: Neutral changes revisited.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005075:Biological Evolution; D003062:Codon; D003574:Cytochrome c Group / Q000235:genetics; D005815:Genetic Code; D006454:Hemoglobins / Q000235:genetics; D006801:Humans; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D013045:Species Specificity
chemical_list: D003062:Codon; D003574:Cytochrome c Group; D006454:Hemoglobins; D011506:Proteins; D012333:RNA, Messenger