TNNI3 and myocardial infarction: The researchers noted that the degree of proteolytic cleavage of cTnI increases with an increase in the severity of ischemia and myocardial injury: the highest degree of proteolytic cleavage of cTnI was characteristic of patients with ST-segment elevation MI, while in patients with non-ST-segment elevation MI, the degree of cTnI degradation was significantly lower.