1. Institute of Microbiology and Genetics, Georg-August-Universität, D-37077 Göttingen, Germany
2. DFG Reserach Center for Molecular Physiology of the Brain (CMPB), Georg-August-Universität, D-37077 Göttingen, Germany
3. Institute of Organic and Biomolecular Chemistry, Georg-August-Universität, D-37077 Göttingen, Germany