1. NMR Signal Enhancement Group Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
2. Center for Biostructural Imaging of Neurodegeneration of UMG Von-Siebold-Str. 3A 37075 Göttingen Germany
3. Research Group for Solid State NMR Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany
4. Department of NMR-based Structural Biology Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany