1. Structural Biology Department Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
2. Faculty of Biology and Preclinical Medicine, Universitätsstraße 31, 93040 Regensburg, Germany
3. Department of Systemic Physiology and Pathophysiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
4. Computational Structural Biology Group, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt am Main, Germany
5. Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, U.S.A.