1. Division of Virology, Department of Microbiology and Immunology
2. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin 53706
3. Laboratory of Prion Diseases, Department of Prion Diseases, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-818, Japan
4. International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
5. ERATO Infection-Induced Host Responses Project, Japan Science and Technology Agency, Saitama 332-0012, Japan