1. Department of Anatomy, Korea University College of Medicine, Seoul 02842, Korea
2. Department of Chemistry, Korea University, Seoul 02841, Korea
3. Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester, Rochester, New York 14642, United States
4. BK21 Graduate Program, Department of Biomedical Sciences, College of Medicine, Korea University Guro Hospital, Seoul 08308, Korea