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Phrenic nerve-diaphragm preparation, indirect stimulation: Pharmacological effects of P. reticulata extracts. A and B are ethyl acetate (EA) and methanol (M) extracts, respectively, at concentrations (mg/ml) of 0.1, 0.2 and 0.4. Each point represents the mean ±SEM of the number of experiments (n). * p<0.05; W = washing.
