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Human amino acids
| Essential | Non-essential | Conditionally essential |
|---|---|---|
| Isoleucine (Ile) | Alanine (Ala) | Arginine (Arg) |
| Leucine (Leu) | Asparagine (Asn) | Cysteine (Cys) |
| Lysine (Lys) | Aspartate (Asp) | Glutamine (Gln) |
| Methionine (Met) | Glutamate (Glu) | Glycine (Gly) |
| Phenylalanine (Phe) | Serine (Ser) | Proline (Pro) |
| Threonine (Thr) | Tyrosine (Tyr) | |
| Tryptophan (Trp) | ||
| Valine (Val) | ||
| Histidine (His) |
