1. Joint Research Division Vascular Biology, Medical Faculty Mannheim, University of Heidelberg, Ludolf-Krehl-Street 13-17, 68167 Mannheim, Germany
2. The German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
3. Progen Biotechnik, Maass-Street 30, 69123 Heidelberg, Germany
4. Helmholtz Group for Cell Biology, German Cancer Research Center, Im Neuenheimer Feld 581, 69120 Heidelberg, Germany