1. Terumo Corporation R & D Center; Kanagawa 259-0151 Japan
2. Department of Molecular Biodefense Research; Yokohama City University School of Medicine, Yokohama City; Kanagawa 236-0004 Japan
3. Department of Biotechnology, Faculty of Bioresource Sciences; Akita Prefectural University; Akita City Akita 010-0195 Japan