Institution: | † Institut für Röntgenphysik, Universität Göttingen, Göttingen, Germany ‡ Max Planck Institut für Biophysikalische Chemie, Department of Neurobiology, Göttingen, Germany § Biophysics, Faculty of Life Sciences, University of Copenhagen, Frederiksberg, Denmark ¶ European Synchrotron Radiation Facility, Grenoble, France |