1. Department of Neurobiology; University of Osnabrück; Barbarastrasse 11 49076 Osnabrück Germany
2. Institute of Chemistry of New Materials; University of Osnabrück; Barbarastrasse 7 49076 Osnabrück Germany
3. Department of Genetics; University of Osnabrück; Barbarastrasse 11 49076 Osnabrück Germany
4. Department of Molecular Neurobiology; University of Bielefeld; Universitätsstrasse 25 33615 Bielefeld Germany