1. Department of Immunology; Institute of Medical Microbiology and Hygiene, University of Freiburg; Freiburg Germany
2. Faculty of Biology; University of Freiburg; Freiburg Germany
3. Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg; Hamburg Germany
4. Department of Biology; Institute of Genetics, University of Erlangen-Nürnberg; Erlangen Germany
5. Institute for Molecular Medicine; Johannes Gutenberg-University of Mainz; Mainz Germany