1. Division of Virology, Department of Microbiology and Immunology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
2. ERATO Infection-Induced Host Responses Project, Japan Science and Technology Agency, Saitama, Japan
3. Department of Special Pathogens, International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo, Japan
4. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
5. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, Madison, Wisconsin, USA