1. Medical Clinic and Policlinic 3Justus‐Liebig University Giessen 35392 Giessen
2. Institute for BiochemistryFaculty of MedicineJustus‐Liebig University 35392 Giessen
3. 25th Medical ClinicFaculty of Clinical MedicineUniversity of Heidelberg 68167 Mannheim
4. Department of NeurosurgeryMedical Faculty of the University of Heidelberg 68167 Mannheim
5. Department of Chemical BiologyMax Planck Institute of Molecular Physiology, and Fachbereich 3 Organische ChemieUniversity of Dortmund Otto‐Hahn‐Str. 6 D‐44227 Dortmund Germany
6. Institut für Organische ChemieUniversität Leipzig D‐04103 Leipzig
7. Institute of PathologyUniversity of Tuebingen 72076 Tuebingen Germany
8. Institute of Animal ScienceThe Volcani Center Bet Dagan Israel
9. Department of Cell Culture TechnologyGesellschaft für Biotechnologische Forschung GmbH (GBF) 38124 Braunschweig
10. Department Gene Regulation and DifferentiationGesellschaft für Biotechnologische Forschung GmbH (GBF) 38124 Braunschweig
11. Medical Research CenterUniversity‐Clinic MannheimMedical Faculty of the University of Heidelberg 68167 Mannheim
12. Max‐Planck‐Institute for Vascular Biologyc/o Institute of Cell BiologyZMBEUniversity of MuensterGermany and Theodor Kocher InstituteUniversity of Berne CH‐3012 Berne Switzerland