The Genetic Code 　 Second Position First Position (5´ end) 　 U C A G 　 Third Position (3´ end) U UUU UUC Phe UUA UUG Leu UCU UCC UCA UCG Ser UAU UAC Tyr UAA  Stop UAG  Stop UGU UGC Cys UGA  Stop UGG Trp U C A G C CUU CUC CUA CUG Leu CCU CCC CCA CCG Pro CAU CAC His CAA CAG Gln CGU CGC CGA CGG Arg U C A G A AUU AUC AUA Ile AUG Met ACU ACC ACA ACG Thr AAU AAC Asn AAA AAG Lys AGU AGC Ser AGA AGG Arg U C A G G GUU GUC GUA GUG Val GCU GCC GCA GCG Ala GAU GAC Asp GAA GAG Glu GGU GGC GGA GGG Gly U C A G 　 　 　 　 Termination Signals Single Letter Code UAA (Ochre) A = adenosine B = C or G or T UAG (Amber) C = cytidine D = A or G or T UGA (Opal) G = guanosine H = A or C or T 　 T = thymidine K = G or T 　 　 M = A or C 　 　 N = A or C or G or T 　 　 R = A or G 　 　 S = C or G 　 　 V = A or C or G 　 　 W = A or T 　 　 Y = C or T

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Amino Acid Structures Each amino acid is accompanied by its three- and one-letter code, residue molecular weight (actual molecular weight minus water) and side-chain pKa where appropriate.

　

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