1. Institute of Organic Chemistry, University of Duisburg-Essen, Universitätstrasse 7, 45141 Essen, Germany
2. Institute of Pharmacy and Food Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
3. Institute of Zoology, University of Kiel, Olshausenstrasse 40, 24098 Kiel, Germany
4. Department of Medicine, San Francisco General Hospital, University of California, San Francisco, Box 0811, San Francisco, California 94143
5. Rudolf-Virchow-Zentrum DFG-Forschungszentrum für Experimentelle Biomedizin, Versbacher Strasse 9, 97078 Würzburg, Germany