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Troponin is a component of thin filaments (along with actin and tropomyosin), and is the protein complex to which calcium binds to trigger the production of muscular force.Troponin itself has three subunits, TnC, TnI, and TnT, each of which playing a role in force regulation.roponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle, tropomyosin blocks the attachment site for the myosin crossbridge, thus preventing contraction.
Troponin and Tropomyosin Proteins That Switch on and Tune in the Activity of Cardiac Myofilaments