1. Xenotransplantation Research Center, Seoul National University College of Medicine, Seoul 03080, Korea.
2. Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 03080, Korea.
3. Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea.
4. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.
5. Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul 03080, Korea.