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Effect of C. cordiifolius essential oil (CcEO; 50 and 100 mg/kg, i.p.) and morphine (M; 7.5 mg/kg, i.p.) in the nociception induced by intraplantar formalin injection. Results are expressed as mean ± SEM (n = 8) with significance level set at P < 0.05. *When compared to the vehicle (V) group in each phase; awhen compared to CcEO 50 mg/kg group in the first phase; bwhen compared to CcEO 50 mg/kg group in the second phase.
