1. a Department of Biopolymers , University of Bayreuth Universitätsstrasse 30 , 95440 , Bayreuth , Germany
2. b Institute of Neuropathology, Heinrich-Heine-University , Moorenstr. 5, 40225 , Düsseldorf , Germany
3. c Institute for Physical Biology Heinrich-Heine-University Düsseldorf and Institute of Neuroscience and Biophysics 2 at the Research Centre, Jülich , 52425 , Jülich , Germany