| 3-HAA | 3-hydroxyanthranilic acid |
| 3-HANA | 3-hydroxyanthrallic acid |
| 3-HAO | 3-hydroxyanthranilate oxidase |
| 3-HK | 3-hydroxy-kynurenine |
| 5-HT | 5-hydroxytryptamine, serotonin |
| ACMSD | 2-amino-3-carboxymuconic-6-semialdehyde decarboxylase |
| ACTH | adrenocorticotropic hormone |
| ATP | adenosine triphosphate |
| IDO | indoleamine 2,3-dioxygenase |
| KAR | kainic acid receptor |
| KAT | kynurenine aminotransferase |
| KMO | kynurenine-3-monooxygenase |
| KYN | kynurenine |
| KYNA | kynurenic acid |
| NAD+ | nicotinamide adenine dinucleotide–oxidized form |
| NADH | nicotinamide adenine dinucleotide–reduced form |
| NMDA | N-methyl-d-aspartate |
| QPRT | quinolinate phosphoribosyl transferase |
| QUIN | quinolic acid |
| TDO | tryptophan 2,3-dioxygenase |
| TRP | tryptophan |
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