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Analgesic effect of PA on acetic acid-induced writhing response in mice. Indomethacin (Indo 10 mg/kg) was used as a therapeutic control. The number of muscular contractions was evaluated as described in Section 2. Treatment of PA at 0.5 and 1.0 g/kg and indomethacin at 10 mg/kg showed inhibition of writhing number compared to the control. Each value represents as mean ± SEM (n = 10). **P < 0.01, ***P < 0.001 as compared with the acetic acid-treated only group.
