title: Variation in enzyme structure and function: the guidelines of evolution.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005075:Biological Evolution; D055598:Chemical Phenomena; D002621:Chemistry; D004790:Enzyme Induction; D004798:Enzymes / Q000096:biosynthesis / Q000378:metabolism; D005815:Genetic Code; D005823:Genetics; D010455:Peptides; D012106:Research
chemical_list: D004798:Enzymes; D010455:Peptides