Affiliation: | Max von Pettenkofer-Institute and Gene Center, Ludwig-Maximilians-University, Feodor-Lynen-Str. 25, 81377 Munich,1. Department of Virology, Institute for Medical Microbiology and Hygiene, Hermann-Herder-Strasse 11,2. Institute of Anatomy and Cell Biology, Albertstr. 23, University of Freiburg, 79104 Freiburg,3. Institute of Immunology, Friedrich-Loeffler-Institut Tübingen, Paul-Ehrlich-Strasse 28, 72076 Tübingen, Germany4. |