Affiliation: | 1. Influenza and Prion Disease Research Center, National Institute of Animal Health, Tsukuba, Ibaraki, Japan;2. Prion Research Center, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, USA;3. Animal Immune and Cell Biology Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan |