Troponin is a complex of three regulatory proteins (troponin C, troponin I and troponin T) that is integral to muscle contraction in skeletal and cardiac muscle, but not smooth muscle.
Discussions of troponin often pertain to its functional characteristics and/or to its usefulness as a diagnostic marker for various heart disorderss.
Read more about Troponin: Function, Physiology, Diagnostic Use, Relation With Contractile Function and Heart Failure