1. Institute of Biochemistry and Biology, University of Potsdam, Karl‐Liebknecht Strasse 24–25, 14476 Potsdam‐Golm, Germany, http://www.uni‐potsdam.de/index.html
2. Department of Biochemistry, Lund University, P. O. Box 124, 22100 Lund, Sweden
3. Fraunhofer Institute for Biomedical Engineering, Am Mühlenberg 13, 14476 Potsdam‐Golm, Germany