| Amino acid | Codons |
| Phe | TTC,TTT |
| Leu | CTA,CTC,CTG,CTT,TTA,TTG |
| Ile | ATA,ATC,ATT |
| Met | ATG |
| Val | GTA,GTC,GTG,GTT |
| Ser | AGC,AGT,TCA,TCC,TCG,TCT |
| Pro | CCA,CCC,CCG,CCT |
| Thr | ACA,ACC,ACG,ACT |
| Ala | GCA,GCC,GCG,GCT |
| Tyr | TAC,TAT |
| His | CAC,CAT |
| Gln | CAA,CAG |
| Asn | AAC,AAT |
| Lys | AAA,AAG |
| Asp | GAC,GAT |
| Glu | GAA,GAG |
| Cys | TGC, TGT |
| Trp | TGG |
| Arg | AGA,AGG,CGA,CGC,CGG,CGT |
| Gly | GGA,GGC,GGG,GGT |
| Stop | TAA,TAG,TGA |
Other genetic codes are defined in terms of differences with the Universal code.
Vertebrate mtDNA.
| Codon | New translation |
| AGA | Stop |
| AGG | Stop |
| ATA | Met |
| TGA | Trp |
Yeast mtDNA.
| Codon | New translation |
| ATA | Met |
| CTA | Thr |
| CTC | Thr |
| CTG | Thr |
| CTT | Thr |
| TGA | Trp |
Mold,Protozoan and Coelenterate mtDNA.
| Codon | New translation |
| TGA | Trp |
Invertebrate mtDNA.
| Codon | New translation |
| AGA | Ser |
| AGG | Ser |
| ATA | Met |
| TGA | Trp |
Ciliate Nuclear Code.
| Codon | New translation |
| TAA | Gln |
| TAG | Gln |
Echinoderm mtDNA.
| Codon | New translation |
| AAA | Asn |
| AGA | Ser |
| AGG | Ser |
| TGA | Trp |
Euplotid mtDNA.
| Codon | New translation |
| TGA | Cys |
Alternative Yeast Nuclear.
| Codon | New translation |
| CTG | Ser |
Ascidian mtDNA.
| Codon | New translation |
| AGA | Gly |
| AGG | Gly |
| AGG | Met |
| TGA | Trp |
Flatworm mtDNA.
| Codon | New translation |
| AAA | Asn |
| AGA | Ser |
| AGG | Ser |
| TAA | Tyr |
| TGA | Trp |
Blepharisma Nuclear.
| Codon | New translation |
| TAG | Gln |