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Analysis of cardiac function and energetics of isolated perfused WT and myo−/− hearts under β-adrenergic stimulation. Hearts were stimulated by coronary application of 50 or 200 nM dobutamine. Symbols show means ± SD for n = 8 hearts from WT (black) and myo−/− hearts (open symbols). ∗, statistically significant (P < 0.05). For abbreviations see Fig. 2.
