Molecular Mechanisms of Muscle Force Regulation: A Role for Titin?


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Abstract

Muscle contraction and force regulation is thought to occur exclusively through the interaction of the contractile proteins actin and myosin and in accordance with the assumptions underlying the cross-bridge theory. Here, we demonstrate that a third protein, titin, plays a major role in muscle force regulation, particularly for eccentric contractions and at long muscle and sarcomere lengths.

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