1. Division of Stem Cell Dynamics Center for Stem Cell Biology and Regenerative MedicineThe Institute of Medical Science The University of Tokyo Tokyo Japan
2. Department of Coloproctological Surgery Tokyo Japan
3. United Centers for Advanced Research and Translational MedicineGraduate School of Medicine, Tohoku University Sendai Japan
4. Department of Immunology and Atopy CenterGraduate School of Medicine, Juntendo University Tokyo Japan
5. Center for Genomic and Regenerative MedicineFaculty of Medicine Tokyo Japan