1. Division of Digestive Diseases, Department of Medicine, University of California at Los Angeles, Los Angeles, CA 90095.
2. Laboratory of Host Defenses, Institute for Advanced Medical Sciences, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
3. Yoshizato Project, CLUSTER, Hiroshima Prefectural Institute of Industrial Science and Technology, Higashi-Hiroshima, Hiroshima 739-0046, Japan.
4. Developmental Biology Laboratory and Hiroshima University 21st Century COE Program for Advanced Radiation Casualty Medicine, Department of Biological Science, Graduate School of Science, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
5. Center for Cell & Gene Therapy, Baylor College of Medicine, Houston, TX 77030.