1 Centre for Biomedicine and Medical Technology (CBTM) and European Center for Angioscience (ECAS), Heidelberg University, Medical Faculty Mannheim, Ludolf-Krehl-Strasse 13-17, D-68167 Mannheim, Germany. adelheid.cerwenka@medma.uni-heidelberg.de.
2 Department of Microbiology and Immunology and Parker Institute for Cancer Immunotherapy, University of California, San Francisco, San Francisco, CA 94143, USA.