1. From the Institute of Physiology (F.A., M.P., A.S., F.S.), University of Regensburg, Regensburg, Germany; Department of Physiology and Pharmacology (K.M., U.G.F.), University of Southern Denmark, Odense, Denmark; Veterans Affairs San Diego Healthcare System (T.T., H.K.H.), Department of Medicine, University of California, San Diego, San Diego, CA; Division of Nano Sciences (P.L.H.), Ewha Womans University, Seoul, Republic of Korea.