U U UUU UCU ser UAU UGu cys U UUC Phe UCC Uac Tyr UGC UCA UCG CAG Yaa* ter UGA* Ter* UUG UAG* UGG Tr CUU leu CCu proCAU h CGU A CUC CAC CUA CCA CGA CUG CCG CGG G caa gIn CAG AAU asn Ser U ACC AGC AUA I CAG AAa lys AGA Arg AAG AUG+ Met GUU val GCU GAU Asp Ggu Gly U GUC GCC GAC GUA GGA GUG GCG GGG CAG gaa gly chain- terminating,or“ nonsense” codons also used to apecify the initiator formyl-Met-tRN Am. the Val troplet GUG is therefore ambiguous" in that it codes both valine and methionineU C A G U UUU UUC Phe UCU UCC UCA UCG ser UAU UAC Tyr UGU UGC cys U C A G UUA UUG leu YAA* UAG* ter UGA* Ter* UGG Trp C CUU CUC CUA CUG leu CCU CCC CCA CCG pro CAU CAC his CGU CGC CGA CGG Arg U C A G CAA CAG gln A AUU AUC AUA Iie ACU ACC ACA ACG AAU AAC asn AGU AGC Ser U C A G AAA AAG lys AGA AGG Arg AUG+ Met G GUU GUC GUA GUG val GCU GCC GCA GCG GAU GAC Asp GGU GGC GGA GGG Gly U C A G GAA GAG gly *chain-terminating, or “nonsense” codons + also used to apecify the initiator formyl-Met-tRN Amet F.the Val troplet GUG is therefore ”ambiguous” in that it codes both valine and methionine