1. Department of Developmental Neurobiology Graduate School of Medical Sciences Kumamoto University Kumamoto 860‐8556 Japan
2. Program for Leading Graduate Schools HIGO (Health Life Science: Interdisciplinary and Glocal Oriented) Kumamoto University Kumamoto 860‐8556 Japan
3. Stem Cell‐Based Tissue Regeneration Research and Education Unit Kumamoto University Kumamoto 860‐8556 Japan
4. Department of Biology Faculty of Applied Science Umm Al‐Qura University 21955 Makkah Saudi Arabia
5. Department of Pathology and Laboratory Medicine University of California Davis Sacramento California 95817 USA
6. Japan Agency for Medical Research and Development (AMED) Tokyo 100‐0004 Japan