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Effects of intra-fourth microinjection of naloxone and naloxone before crocetin (10.00 μg μL-1) on the formalin-induced orofacial pain. * indicates a significant decrease at p < 0.05 in comparison with artificial cerebrospinal fluid (aCSF) treated group. † indicates a significant increase (p < 0.05) compared to the aCSF treated group
