1. Cardiac Physiology Lab (B.R., Y.M., J.S., E.M., G.H.), National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.
2. Department of Integrative Biology and Physiology, University of Minnesota Medical School, Minneapolis, MN (H.C.V., J.C.L.).
3. Mouse Phenotyping Core (D.S.), National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.