| ICV | Intracerebroventricular |
| ARC | Arcuate nucleus |
| β-EP | β-endorphin |
| MENK | Met-enkephalin |
| PAG | Periaqueductal gray area |
| POMC | Pro-opiomelanocortin |
| NO | Nitric oxide |
| ACSF | Artificial cerebrospinal fluid |
| HPLC | High-performance liquid chromatograph |
| ANOVA | Analysis of variance |
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