Codon table

Codon tables describe how the triplet codon of RNA (or DNA) is read by specific tRNAs to map to a particular amino acid. Many organisms use the Standard Codon Table, shown below.

Standard Codon table

	T	C	A	G
T	TTT Phe F Phenylalanine TTC Phe F Phenylalanine TTA Leu L Leucine TTG Leu L Leucine	TCT Ser S Serine TCC Ser S Serine TCA Ser S Serine TCG Ser S Serine	TAT Tyr Y Tyrosine TAC Tyr Y Tyrosine TAA Ochre (Stop) TAG Amber (Stop)	TGT Cys C Cysteine TGC Cys C Cysteine TGA Opal (Stop) TGG Trp W Tryptophan
C	CTT Leu L Leucine CTC Leu L Leucine CTA Leu L Leucine CTG Leu L Leucine	CCT Pro P Proline CCC Pro P Proline CCA Pro P Proline CCG Pro P Proline	CAT His H Histidine CAC His H Histidine CAA Gln Q Glutamine CAG Gln Q Glutamine	CGT Arg R Arginine CGC Arg R Arginine CGA Arg R Arginine CGG Arg R Arginine
A	ATT Ile I Isoleucine ATC Ile I Isoleucine ATA Ile I Isoleucine ATG Met M Methionine, Start	ACT Thr T Threonine ACC Thr T Threonine ACA Thr T Threonine ACG Thr T Threonine	AAT Asn N Asparagine AAC Asn N Asparagine AAA Lys K Lysine AAG Lys K Lysine	AGT Ser S Serine AGC Ser S Serine AGA Arg R Arginine AGG Arg R Arginine
G	GTT Val V Valine GTC Val V Valine GTA Val V Valine GTG Val V Valine	GCT Ala A Alanine GCC Ala A Alanine GCA Ala A Alanine GCG Ala A Alanine	GAT Asp D Aspartic acid GAC Asp D Aspartic acid GAA Glu E Glutamic acid GAG Glu E Glutamic acid	GGT Gly G Glycine GGC Gly G Glycine GGA Gly G Glycine GGG Gly G Glycine

¹The codon ATG both codes for methionine and serves as an initiation site: the first ATG in an mRNA's coding region is where translation into protein begins.
²UGA can also code for selenomethionine: the twenty-first amino acid, discovered in 1986.
³UAG can also code for pyrrolysine: the twenty-second amino acid, discovered in 2002.