| Arg | Arginine |
| CMP | Cytidine monophosphate |
| GABA | γ-Aminobutyric acid |
| GMP | Guanosine monophosphate |
| HDC | Histidine decarboxylase |
| IDO | Indoleamine-2,3-dioxygenase |
| Kyn | Kynurenine |
| Lcn2 | Lipocalin 2 |
| NO | Nitric oxide |
| Npas4 | Neuronal PAS domain protein 4 |
| Orn | Ornithine |
| PC | Principal component |
| PCA | Principal component analysis |
| Put | Putrescine |
| SAMP10 | Senescence-accelerated mice prone 10 |
| Trp | Tryptophan |
| TDO | Tryptophan-2,3-dioxygenase |
| UHPLC-MS/MS | Ultra-high performance liquid chromatography-tandem mass spectrometry |
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