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Dose-response curve describing the negative inotropic effect of various concentrations of 4′-chlorodiazepam (4-ClDzp) on left ventricular developed pressure (LVDP) in intact rabbit hearts. Animal numbers were n = 7, 4, 6, and 1 for 0, 12, 24, and 64 μM 4′-chlorodiazepam.
