1. 1Department of Infection Genetics, Helmholtz Centre for Infection Research, Braunschweig, Germany
2. 2Department of Structure and Function of Proteins, Helmholtz Centre for Infection Research, Braunschweig, Germany
3. 3Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
4. 4Institute of Virology Muenster (IVM), Westfaelische Wilhelms-University (WWU) Muenster, Muenster, Germany
5. 6Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA
6. 5University of Veterinary Medicine Hannover, Hannover, Germany