1. Department of Biomedical Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
2. Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, Tokyo, Japan.
3. Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan.
4. iPS Cell Project, Kyoto, Kyoto Japan.
5. Center for Experimental Medicine and Systems Biology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan.
6. Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Tokyo, Japan.