1. Department of Molecular Microbiology, Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland
2. Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland
3. Institute of Biotechnology, Faculty III, Technical University Berlin (TUB), Berlin, Germany
4. Present address: Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
5. Present address: Center for Infectious Disease, Seattle, WA, USA