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PKA phosphorylates Myosin Binding Protein-C (MyBP-C) and troponin I (TnI) throughout the cardiac myofibril. TnI is definitely the inhibitory part with the trimeric troponin molecule that makes up the Ca2+-swap on the contractile apparatus. TnI binds to TnC when Ca2+ is certain to TnC, although while in the absence of Ca2+, the C-terminus of TnI is