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Effects of the specific opioid receptor subtype antagonists, given intrathecally, on dezocine (A–C) and morphine antinociception (D–F) in neuropathic rats, induced by tight ligation of L5/L6 spinal nerves. Data are presented as means ± SEM (n = 6–8 in each group). *P < 0.05 vs. the respective normal saline + dezocine and normal saline + morphine group, by repeats-measured two-way ANOVA followed by post-hoc student-Newman-Keuls tests.
