1. From the Department of Physiology, Cardiovascular Center Medical College of Wisconsin, Milwaukee, WI (M.Z., P.N., N.M.M., K.B., J.L.G., C.D.S.)
2. Department of Neurosurgery (M.Z.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA
3. Department of Pharmacology and Neuroscience (F.A.C.S., G.D.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA
4. Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH (S.S.K.).