| ANOVA | Analysis of variance |
| CCI | Chronic Constriction Injury |
| CI | Confidence interval |
| CPP | Conditioned place preference |
| DMSO | Dimethyl sulfoxide |
| DOR | Delta opioid receptor |
| HATU | 2-(1H-7-Azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate |
| HOBt | Hydroxybenzotriazole |
| i.c.v. | Intracerebroventricular |
| i.p. | Intraperitoneal |
| ITR | Inverted terminal repeat |
| KOR | Kappa opioid receptor |
| MOR | Mu opioid receptor |
| ND | Not determined |
| NMDA | N-methyl-D-aspartate |
| RM | Repeated measures |
| SEM | Standard error of the mean |
| SR | Sigma receptor |
| S1R | Sigma-1 receptor |
| S2R | Sigma-2 receptor |
| SNC-80 | (+)-4-[(αR)-α-((2S,5R)-4-Allyl-2,5-dimethyl-1-piperazinyl)-3-methoxybenzyl]-N,N-diethylbenzamide |
| TFA | Trifluoroacetic acid |
| U50,488 | (±)-trans-3,4-Dichloro-N-methyl-N-[2-(1-pyrrolidinyl)cyclohexyl]benzeneacetamide |
| UHPLC | Ultrahigh performance liquid chromatography |
| WWTW | Warm-water tail withdrawal |
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