Troponin

Troponin is a protein of muscle, blood levels of which have become important in diagnosis. "Its function is to serve as the calcium-binding component in the troponin-tropomyosin B-actin-myosin complex by conferring calcium sensitivity to the cross-linked actin and myosin filaments.

"Cardiac troponins are regulatory proteins of the thin actin filaments of the cardiac muscle. Troponin T and troponin I are highly sensitive and specific markers of myocardial injury." Troponin levels have become an important diagnostic tool in assessing acute coronary syndrome, but it is dangerous to assume that ACS is the only reason they may be elevated.