On the question of the origin and evolution of the genetic system.
D001483:Base Sequence; D001669:Biochemical Phenomena; D001671:Biochemistry; D005075:Biological Evolution; D004247:DNA; D008967:Molecular Biology; D009694:Nucleic Acid Precursors; D012313:RNA
D009694:Nucleic Acid Precursors; D012313:RNA; D004247:DNA