1. Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
2. Institut de Biologie Structurale Jean-Pierre Ebel, CEA-CNRS-UJF UMR 5075, 41 Rue Jules Horowitz, Grenoble 38027, France
3. Max Planck Unit for Structural Molecular Biology, c/o DESY, Notkestrasse 85, 22607 Hamburg, Germany
4. DZNE, German Center for Neurodegenerative Diseases, c/o CAESAR, Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
5. DFG Center for the Molecular Physiology of the Brain, 37073 Göttingen, Germany