1. NMR Signal Enhancement Group, Max Planck Institute for Biophysical Chemistry, AmFaßberg 11, 37077 Göttingen, Germany.
2. Center for Biostructural Imaging of Neurodegeneration of UMG, Von-Siebold-Straße 3A, 37075 Göttingen, Germany.
3. Department of Neurology, University Medical Center Göttingen, Waldweg 33, 37073 Göttingen, Germany.
4. Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany.
5. Institute for Neuro- and Sensory Physiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany.