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Figure 4 Creatine kinase (CK) leakage (A) during the 120 min reoxygenation period (last 120 min in the aerobic control group) and MTT reduction (B) at the end of the reoxygenation period in study 2 (for protocol see Fig. 2). Data are expressed as mean ± standard error of mean of six experiments. *p < 0.05 versus corresponding group subjected to ischemia alone;  p < 0.05 versus corresponding group subjected to preconditioning (PC). White bar: left ventricular ejection fraction (LVEF) >50%; striped bar: LVEF = 30% to 50%; black bar: LVEF <30%.
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