<unk> , along with troponin, regulates the shortening of the muscle protein filaments actin and myosin. In resting muscle fibres,<unk>  is displaced from its normal binding groove by troponin. This displaced conformation of<unk>  prevents the binding of myosin heads, thereby inhibiting muscle contraction. Under normal stimulation to muscle fibers, Ca2+ ions are released from the sarcoplasmic reticulum of the myocytes which causes troponin to release its hold on actin, allowing<unk>  to return to a normal conformation which allows myosin heads to walk along actin filaments and thereby facilitating muscle contraction.
Tropomyosin
Myosin
Calmodulin
Cardiolipin
Diastase
Intermediate filament
Ovalbumin
Dynactin