title: Replaceability of amino acids and the self-facilitation of evolution.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000378:metabolism*; D001483:Base Sequence; D005075:Biological Evolution; D003062:Codon; D009154:Mutation; D011506:Proteins / Q000378:metabolism; D012641:Selection, Genetic
chemical_list: D000596:Amino Acids; D003062:Codon; D011506:Proteins