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Figure 3 Comparison of enzymatic activity of electron transport chain complexes I (A), II + III (B), III (C), and IV (D) normalized to citrate synthase activity (CS) in human left ventricular myocardium from terminal heart failure patients receiving beta-blocker therapy (ß-bl. pos., n = 25) before explantation and patients without this therapy (ß-bl. neg., n = 18). Data are given as mean ± SEM. *p < 0.05.
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