1. From the Department of Physiology (Z.A.A., Y.D.B., E.O., H.A., O.B.) and the Department of Pharmacology (A.B., O.B.-A., T.A., M.Y.), Rappaport Faculty of Medicine, Technion, Haifa, Israel; the Department of Cardiology (A.R.) and Research Unit (Z.A.A.), Rambam Health Campus, Haifa, Israel; and Max-Planck Institute, Core Facility of Molecular and Structural Biology, Bad Nauheim, Germany (S.K., J.S.).