| CNS | Central nervous system |
| DBH | Dopamine β-hydroxylase |
| GI | Gastrointestinal |
| MDD | Major depressive disorders |
| MRS | De Man, Rogosa, Sharpe |
| OTUs | Operational taxonomic units |
| PCoA | Principal coordinates analysis |
| PERMANOVA | Permutational analysis of variance |
| URTI | Upper respiratory tract infections |
| TDO | Tryptophan 2,3-dioxygenase |
| TPH2 | Tryptophan hydroxylase-2 |
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