. 1998 Apr 28;95(9):5088–5093. doi: 10.1073/pnas.95.9.5088

Table 1.

Standard genetic code

1st base	U		2nd base				G		3rd base
1st base	U		C		A		G		3rd base
U	UUU ⌉	Phe	UCU ⌉	Ser	UAU ⌉	Tyr	UGU	Cys	U
	UUC ⌋	Phe	UCC		UAC ⌋	Tyr	UGC ⌋	Cys	C
	UUA ⌉	Leu	UCA		UAA^*	stop	UGA^*	stop	A
	UUG⁺ ⌋	Leu	UCG		UAG^*	stop	UGG	Trp	G
C	CUU ⌉	Leu	CCU ⌉	Pro	CAU ⌉	His	CGU ⌉	Arg	U
	CUC		CCC		CAC ⌋	His	CGC		C
	CUA		CCA		CAA ⌉	Gln	CGA		A
	CUG⁺ ⌋		CCG ⌋		CAG ⌋	Gln	CGG ⌋		G
A	AUU ⌉	Ile	ACU ⌉	Thr	AAU ⌉	Asn	AGU ⌉	Ser	U
	AUC		ACC		AAC ⌋	Asn	AGC ⌋	Ser	C
	AUA ⌋		ACA		AAA ⌉	Lys	AGA ⌉	Arg	A
	AUG⁺	Met	ACG ⌋		AAG ⌋	Lys	AGG ⌋	Arg	G
G	GUU ⌉	Val	GCU ⌉	Ala	GAU ⌉	Asp	GGU ⌉	Gly	U
	GUC		GCC		GAC ⌋	Asp	GGC		C
	GUA		GCA		GAA ⌉	Glu	GGA		A
	GUG ⌋		GCG ⌋		GAG ⌋	Glu	GGG ⌋		G

The codons marked with + are chain-initiator or initiation codons, and stop codons are chain-terminating codons.