1. Department of Immunology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
2. Department of Cell Biology, Kyoto Pharmaceutical University, Kyoto 607-8412, Japan
3. Department of Life Science, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, Sapporo 006-8585, Japan
4. Department of Hematology, International University of Health and Welfare, Narita 286-8686, Japan