title: The origin of the genetic code.
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D005075:Biological Evolution; D004926:Escherichia coli; D005815:Genetic Code; D009705:Nucleosides / Q000502:physiology; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000502:physiology
chemical_list: D000596:Amino Acids; D009705:Nucleosides; D012333:RNA, Messenger