Experiments concerning Duchenne muscular dystrophy (DMD), rare genetic disorder caused by the mutations in DMD gene and total lack of dystrophin protein, manifested by progressive muscle weakness and accompanying cardiomyopathy (for a review, see Loboda and Dulak [111]), demonstrated increased arrhythmic events rate in DMD hiPSC-CMs in comparison to isogenic control [83]. The gene discussed is DMD; the disease is hereditary disease.