1. Department of Cell Biology and Neuroscience; Juntendo University Graduate School of Medicine; 2-1-1 Hongo, Bunkyo-ku; Tokyo; 113-8421; Japan
2. Division of Gross Anatomy and Morphogenesis; Department of Regenerative and Transplant Medicine; Niigata University Graduate School of Medical and Dental Sciences; Niigata; Japan
3. Department of Biochemistry; Juntendo University Graduate School of Medicine; Tokyo; Japan
4. Institut für Molekuläre Medizin und Zellforschung; Albert Ludwigs Universität Freibrug; Freibrug; Germany
5. Department of Biochemistry; University Kiel; Kiel; Germany