1. Institute of Pharmacy and Food Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
2. Rudolf-Virchow-Zentrum, DFG-Forschungszentrum für Experimentelle Biomedizin, University of Würzburg, Josef-Schneider-Strasse 2, 97080 Würzburg, Germany
3. Institute of Organic Chemistry, University of Duisburg-Essen, Universitätstrasse 7, 45141 Essen, Germany
4. Institute of Zoology, University of Kiel, Olshausenstrasse 40, 24098 Kiel, Germany
5. Department of Tropical Medicine, Medical Mission Institute, Salvatorstrasse 7, 97074 Würzburg, Germany
6. Department of Medicine, San Francisco General Hospital, University of California, San Francisco, Box 0811, San Francisco, California 94143