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Cardiac troponin is a regulatory protein of the myocardial contractile apparatus. Of its three subtypes (troponin T, I, and C), only cardiac troponin T (cTnT) and troponin I (cTnI) are solely expressed in cardiomyocytes. Elevations of cTnT or cTnI therefore indicate myocardial injury. In addition, Cardiac troponin I (cTnI) has been shown to be an accurate predictor of myocardial injury in cattle.