1. From the Department of Physiology (D.K.A., S.T.E., J.E.V.E.), Queen’s University, Kingston, Ontario, Canada; and Departments of Medicine (S.T.E., Y.G., M.M., E.M., J.E.V.E.), Biological Chemistry (L.A.K., Y.H.K., P.L.P., J.E.V.E.), Pediatrics (J.R., A.M.M.), and Biomedical Engineering (J.E.V.E.), The Johns Hopkins University, Baltimore, Md. Present address for D.K.A.: Division of Cardiovascular Diseases, Departments of Medicine, Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic,...