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Changes in phosphocreatine (Pcr) in the ischemic myocardium over time. In the preconditioning (PC) group, a Pcr overshoot was observed after PC, and Pcr was still detectable until 20 min of sustained ischemia (P<0.05 versus control group). No difference was observed at any time between the control and the N-2-mercaptopropionyl glycine (MPG) group. There were no significant differences in Pcr among the four treatment groups after 20 min of sustained ischemia
