1. Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen 37077, Germany
2. Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg 26129, Germany
3. Department of Neurology, University Medical Center Göttingen, Göttingen 37075, Germany
4. Institute for Physical Biology, Heinrich Heine University, Düsseldorf 40225, Germany