1. Department of Physiology, Brain Korea 21 Project for Medical Science and Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul 120-752, Korea.
2. CHA Stem Cell Institute, CHA University College of Medicine, Seoul 463-840, Korea.
3. Department of Laboratory Medicine and Cell Therapy Center, Yonsei University College of Medicine, Seoul 120-752, Korea.
4. Department of Pediatrics, Yonsei University College of Medicine, Seoul 120-752, Korea.