| Genome | Codon | Universal Code | Altered Code |
|---|---|---|---|
| Bacterial DNA | |||
| Mycoplasma capricolum | UGA | Stop | Trp |
| Mitochondrial DNA | |||
| Human | UGA | Stop | Trp |
| Human | AUA | Ile | Met |
| Human | AGA, AGG | Arg | Stop |
| Yeast | UGA | Stop | Trp |
| Trypanosomas | UGA | Stop | Trp |
| Plants | CGG | Arg | Trp |
| Nuclear DNA | |||
| Tetrahymena | UAA | Stop | Gln |
| Paramecium | UAG | Stop | Gln |