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.

Comprehensive information about codon usage in different organisms can be found at the NCBI Taxonomy site

Standard Codon table

	U	C	A	G
U	UUU Phe F Phenylalanine UUC Phe F Phenylalanine UUA Leu L Leucine UUG Leu L Leucine	UCU Ser S Serine UCC Ser S Serine UCA Ser S Serine UCG Ser S Serine	UAU Tyr Y Tyrosine UAC Tyr Y Tyrosine UAA Ochre (Stop) UAG Amber (Stop)	UGU Cys C Cysteine UGC Cys C Cysteine UGA Opal (Stop) UGG Trp W Tryptophan
C	CUU Leu L Leucine CUC Leu L Leucine CUA Leu L Leucine CUG Leu L Leucine	CCU Pro P Proline CCC Pro P Proline CCA Pro P Proline CCG Pro P Proline	CAU His H Histidine CAC His H Histidine CAA Gln Q Glutamine CAG Gln Q Glutamine	CGU 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.