Cardiac troponin C (cTnC), as opposed to TnI and TnT, has a completely identical amino acid structure to the muscular (skeletal) TnC, and increased blood levels of this protein will not let us reliably distinguish the cardiac muscle tissue injury from the damage of skeletal muscles, and, therefore, cTnC cannot be used as a cardiac marker for MI diagnostics [9,10]. The gene discussed is TNC; the disease is myocardial infarction.