| AAAD | Aromatic amino acid decarboxylase |
| AMP | Antimicrobial peptide |
| CNS | Central nervous system |
| CTQ | Cysteine tryptophylquinone |
| 5-HT | 5-hydroxy-tryptamine |
| 5-HTP | 5-hydroxy-tryptophan |
| IDO | Indole 2,3-dioxygenase |
| IFN | Interferon |
| LPS | Lipopolysaccharide |
| MADH | Methylamine dehydrogenase |
| OTC | Over the counter (non-prescription) |
| PIV3 | Parainfluenza virus Type 3 |
| PPR | Pentatricopeptide repeat |
| TDO | Tryptophan 2,3-dehydrogenase |
| TH | Tyrosine hydroxylase |
| TPH | Tryptophan hydroxylase |
| TPR | Tetratricopeptide |
| TTQ | Tryptophan tryptophylquinone |
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