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Inhibitory effect of (A) Mc.Cr and (B) verapamil on the force and rate of spontaneous contractions of isolated guinea-pig atria. #P < 0.05; ##P < 0.01; ###P < 0.001; show comparison of concentration-dependent effects on force while *P < 0.05;**P < 0.01; ***P < 0.001; show comparison of concentration-dependent effects on rate of guinea-pig atria.
