TNNT2 and myocarditis: In contrast, myocarditis patients with adequate vitamin D had high serum levels of IL-4, which is known to be a potent inhibitor of NK cells directly in a concentration-dependent manner and may suppress the binding and cytotoxicity of NK cells in the vascular endothelium specifically, leading to lower cTnT levels and fewer patients with chest pain (33, 34, 41).