Translations:Amino acid/47/en
| Ambiguous amino acids | 3-letter | 1-letter | Amino acids included | Codons included |
|---|---|---|---|---|
| Any / unknown | Xaa | X | All | NNN |
| Asparagine or aspartate | Asx | B | D, N | RAY |
| Glutamine or glutamate | Glx | Z | E, Q | SAR |
| Leucine or isoleucine | Xle | J | I, L | YTR, ATH, CTY |
| Hydrophobic | Φ | V, I, L, F, W, Y, M | NTN, TAY, TGG | |
| Aromatic | Ω | F, W, Y, H | YWY, TTY, TGG | |
| Aliphatic (non-aromatic) | Ψ | V, I, L, M | VTN, TTR | |
| Small | π | P, G, A, S | BCN, RGY, GGR | |
| Hydrophilic | ζ | S, T, H, N, Q, E, D, K, R | VAN, WCN, CGN, AGY | |
| Positively-charged | + | K, R, H | ARR, CRY, CGR | |
| Negatively-charged | − | D, E | GAN |