Amino Acid	Letter	Abbrev.	Codon	Mitochondrial Rule
Alanine	A	Ala	GCU, GCC, GCA, GCG
Aspartic acid(D) or Asparagine(N)	B	Asx	GAU, GAC, AAU, AAC
Cysteine	C	Cys	UGU, UGC
Aspartic acid	D	Asp	GAU, GAC
Glutamic acid	E	Glu	GAA, GAG
Phenylalanine	F	Phe	UUU, UUC
Glycine	G	Gly	GGU, GGC, GGA, GGG
Histidine	H	His	CAU, CAC
Isoleucine	I	Ile	AUU, AUC, AUA	not AUA
Leucine(L) or Isoleucine(I)	J	Xle	AUU, AUC, AUA UUA, UUG, CUU, CUC, CUA, CUG
Lysine	K	Lys	AAA, AAG
Leucine	L	Leu	UUA, UUG, CUU, CUC, CUA, CUG
Methionine	M	Met	AUG (see start)	AUA also
Asparagine	N	Asn	AAU, AAC
Proline	P	Pro	CCU, CCC, CCA, CCG
Glutamine	Q	Gln	CAA, CAG
Arginine	R	Arg	CGU, CGC, CGA, CGG, AGA, AGG	not AGA or AGG
Serine	S	Ser	UCU, UCC, UCA, UCG, AGU, AGC
Threonine	T	Thr	ACU, ACC, ACA, ACG
Valine	V	Val	GUU, GUC, GUA, GUG
Tryptophan	W	Trp	UGG	UGA also
Uknown or Unspecified	X	Xxx or Xaa
Tyrosine	Y	Tyr	UAU, UAC
Glutamic acid(E) or Glutamine(Q)	Z	Glx	GAA, GAG, CAA, CAG
start			AUG (see Met)
stop			UAA, UAG, UGA	UAA, UAG, AGA, AGG