| AD | Alzheimer’s disease |
| ADHD | attention-deficit/hyperactivity disorder |
| AI | artificial intelligence |
| CB1 | cannabinoid receptor type 1 |
| CSF | cerebrospinal fluid |
| HPA | hypothalamic–pituitary–adrenal |
| 5-HT | 5-hydroxytryptamine |
| 5-HT1A | 5-hydroxytryptamine receptor type 1A |
| 5-HTP | 5-hydroxytryptophan |
| IL | interleukin |
| MAO-A | monoamine oxidase A |
| miR-200b-3p | microRNA 200b family subtype the 3′ strand |
| OCD | obsessive–compulsive disorder |
| PET | positron emission tomography |
| p-tau217/231 | phosphorylated tau protein at threonine 217 and threonine 231 |
| TAARs | trace amine-associated receptors |
| TNF | tumor necrosis factor |
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