TNC and myocardial infarction: Cardiospecific TnC, as opposed to TnI and TnT, has completely identical amino acid structure with 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, cardiospecific TnС cannot be used as a cardiac marker for MI diagnostics (Wang et al., 2020; Chaulin, 2021b).