| 5-HIAA | 5-hydroxyindoleacetic acid |
| 5-HT | serotonin |
| 5-HTOL | 5-hydroxytryptophol |
| 5-HTRP | 5-hydroxytryptophan |
| 5-MIAA | 5-methoxyindoleacetic acid |
| 5-MTAM | 5-methoxytryptamine |
| 5-MTOL | 5-methoxytryptophol |
| 5-MTRP | 5-methoxytryptophan |
| AADC | aromatic L-amino acid decarboxylase |
| AA-NAT | arylalkylamine N-acetyltransferase |
| ASMT | N-acetylserotonin O-methyltransferase |
| HPLC | high-pressure liquid chromatography |
| MLT | melatonin |
| NAS | N-acetylserotonin |
| TPH | tryptophan hydroxylase |
| TRP | tryptophan |