GREM1 and dilated cardiomyopathy: Characterized findings of Grem1 protein expression in cardiomyocytes documented in our study were consistent with study results of Mueller A. L. et al., where intensity of Grem1 expression correlating with the declining left cardiac ventricular function was detected by the immunohistochemistry in the endomyocardial biopsies of patients diagnosed with dilatative cardiomyopathy [24].