1. Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
2. Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
3. Cell Biology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
4. Department of Neurology, University of Göttingen Medical School, 37073 Göttingen, Germany