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A, increased expression of PKCα in failing hearts compared with control. B, frequency dependency of PKC phosphorylation in failing hearts but not in control. Abbreviations used: PKCα, protein kinase C α; P-PKCα, phosphorylated PKCα. Values are expressed as means ±s.e.m.*P < 0.05 versus control, #P < 0.05 versus 0 Hz.
