| USV | Ultrasonic vocalization |
| DRN | Dorsal raphé nucleus |
| TPH | Tryptophan hydroxylase |
| DRD | Dorsal midline subdivision of the DRN |
| DRV | Ventral midline subdivision of the DRN |
| DRL | Dorsal lateral subdivisions of the DRN |
| PDR | Posterodorsal subdivision of the DRN |
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