Genetic murine models: Gain-of-function RyR2, CAMKII overexpression, constitutively active CAN, CPVT Diabetic hyperglycemia murine model Human cardiomyocytes from diabetic HF patients Cardiomyocytes derived from induced pluripotent stem cells from CPVT patients Trabeculae from HF patients. The gene discussed is RYR2; the disease is hydrops fetalis.