The Genetic Code. The table has been reoriented Displaying the four RNA nucleotides in the non-standard order, Guanosine monophosphate, G; Cytosine monophosphate, C; Adenosine monophosphate, A; and Uridine monophosphate, U; to encode the 20 amino acids: Glycine (Gly), Alanine (Ala), Arginine (Arg), Proline (Pro), Threonine (Thr), Serine (Ser), Cysteine (Cys), Glutamic Acid (Glu), Glutamine (Gln), Aspartic Acid (Asp), Asparagine (Asn), Lysine (Lys), Histidine (Hist), Valine (Val), Leucine (Leu), Isoleucine (ILeu), Methionine (Met), Phenylalanine (Phe), Tyrosine (Tyr), Tryptophan (Trp) and the peptide termination codons, Term.