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cycle. The blocked (B) state occurs in diastole when intracellular calcium is low and Tm blocks the myosin binding site on actin. The closed (C) state is when Tm is positioned on the inner groove of actin; in this state myosin is in a "cocked" position where heads are weakly bound and not generating force. The myosin binding (M) state is when Tm is further displaced from actin by myosin

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