1. Institute for Physical Chemistry, Georg-August Universität, Tammannstr. 6, 37077 Göttingen, Germany
2. Institute for Organic and Biomolecular Chemistry, Georg-August Universität, Tammannstr. 2, 37077 Göttingen, Germany
3. Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Faβberg 11, 37077 Göttingen, Germany