1. Institute of Biochemistry, University of Münster, Corrensstr. 36, D-48149 Münster, Germany
2. Department of Chemistry and Biochemistry, Denison University, 100 W. College St., Granville, Ohio 43023, USA
3. Institute of Chemical Epigenetics, Ludwig-Maximilians-University Munich, Butenandtstr. 5-13, Haus F, D-81377 Munich, Germany
4. Cells in Motion Interfaculty Centre, University of Münster, Waldeyerstraße 15, D-48149 Münster, Germany