1. Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku 20520, Finland.
2. Turku Doctoral Programme of Molecular Medicine, University of Turku, Turku, Finland.
3. Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
4. Turku Central Animal Laboratory, University of Turku, Turku 20520, Finland.
5. Department of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku 20520, Finland.
6. Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.