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Total PP activity was determined in supernatants from NF and failing (ICM; DCM) hearts using [32P]-labeled phosphorylase a as substrate (a). Aliquots of supernatants were also assayed in the presence of 3 nmol/l okadaic acid, representing the concentration that inhibits only PP2A but not PP1. Therefore, PP2A activity was calculated as the total PP activity minus the activity that was not inhibited by okadaic acid (b). *P < 0.05 vs. NF
