title: Possibilities for the evolution of the genetic code from a preceding form.
mesh_terms: D000227:Adenine Nucleotides / Q000032:analysis; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000378:metabolism; D001483:Base Sequence; D005075:Biological Evolution; D003597:Cytosine Nucleotides / Q000032:analysis; D004926:Escherichia coli / Q000032:analysis; D005815:Genetic Code; D006150:Guanine Nucleotides / Q000032:analysis; D007292:Inosine Nucleotides / Q000032:analysis; D008954:Models, Biological; D009705:Nucleosides / Q000032:analysis; D009711:Nucleotides / Q000032:analysis; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000032:analysis*; D012343:RNA, Transfer / Q000032:analysis*; D012441:Saccharomyces cerevisiae / Q000032:analysis; D014500:Uracil Nucleotides / Q000032:analysis
chemical_list: D000227:Adenine Nucleotides; D000596:Amino Acids; D003597:Cytosine Nucleotides; D006150:Guanine Nucleotides; D007292:Inosine Nucleotides; D009705:Nucleosides; D009711:Nucleotides; D012333:RNA, Messenger; D014500:Uracil Nucleotides; D012343:RNA, Transfer