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Fig. 1. Temperature-dependence of contractility in spontaneously beating perfused burbot hearts with acute temperature changes from 1±0.5 °C to 18±0.5 °C. (A) Heart rate, (B) maximum developed force Fmax, (C) time course of contraction, (D) pumping capacity of the heart (Fmaxxheart rate). Values are means ± S.E.M. from eight hearts.