1. Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, Otto-Hahn-Str.11, 44227 Dortmund, Germany.
2. Department of Genetics, University of North Carolina, Chapel Hill, NC 27599–7264, USA.
3. Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany.
4. Department of Molecular Life Sciences, University of Zurich, Irchel Campus, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.