1. Institute for Physiological Chemistry, Department of Systems Biology, Faculty of Medicine, Ruhr University of Bochum, 44780 Bochum, Germany
2. Department of Physical Chemistry 1, Faculty of Chemistry and Biochemistry, Ruhr University of Bochum, 44780 Bochum, Germany
3. Medizinisches Proteom-Center, Faculty of Medicine, Ruhr University of Bochum, 44780 Bochum, Germany
4. Faculty of Biology and BIOSS Centre for Biological Signalling Systems, University of Freiburg, 79104 Freiburg, Germany
5. Institute of Anatomy and Molecular Embryology, Faculty of Medicine, Ruhr University of Bochum, 44780 Bochum, Germany