1. Division of Regenerative Medicine, Center for Molecular Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke-shi, Tochigi 329-0498, Japan
2. Division of Stem Cell Research and Drug Development, Center for Development of Advanced Medical Technology, Jichi Medical University, Tochigi, Japan
3. Division for Medical Skill Training, Center for Development of Advanced Medical Technology, Jichi Medical University, Tochigi, Japan
4. Division of Development of Animal Resource, Center for Development of Advanced Medical Technology, Jichi Medical University, Tochigi, Japan