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The analgesic effects of μ-TRTX-Hhn1b in the rat formalin test. μ-TRTX-Hhn1b and morphine were administrated by i.p. injection 15 min before formalin. The inset shows the sum of flinching, licking/biting in the formalin test during 40 min. Data are represented as the mean ± SEM of six animals per group. ** p < 0.05, * p < 0.01.
