1. Department of Bionanotechnology; Hanyang University; 55 Hanyangdaehak-ro Ansan 155-88 Korea
2. Present address: Molecular Biophysics; Technische Universität Kaiserslautern; Erwin-Schrödinger-Strasse 13 67663 Kaiserslautern Germany
3. Molecular and Cellular Physiology; Stanford University; 279 Campus Drive Stanford CA 94305 USA
4. Department of Neuroscience; University of Copenhagen; Blegdamsvej 3 2200 Copenhagen Denmark
5. Department of Cell Physiology and Molecular Biophysics; Center for Membrane Protein Research; School of Medicine; Texas Tech University Health Sciences Center; 3601 4th St. MS 6551 Lubbock TX 79430 USA
6. Department of Life Sciences; Imperial College London; Exhibition Road London SW7 2AZ UK