Codon table

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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


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


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


AUU Ile I Isoleucine
AUC Ile I Isoleucine
AUA Ile I Isoleucine
AUG Met M Methionine, Start

ACU Thr T Threonine
ACC Thr T Threonine
ACA Thr T Threonine
ACG Thr T Threonine

AAU Asn N Asparagine
AAC Asn N Asparagine
AAA Lys K Lysine
AAG Lys K Lysine

AGU Ser S Serine
AGC Ser S Serine
AGA Arg R Arginine
AGG Arg R Arginine


GUU Val V Valine
GUC Val V Valine
GUA Val V Valine
GUG Val V Valine

GCU Ala A Alanine
GCC Ala A Alanine
GCA Ala A Alanine
GCG Ala A Alanine

GAU Asp D Aspartic acid
GAC Asp D Aspartic acid
GAA Glu E Glutamic acid
GAG Glu E Glutamic acid

GGU 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.