1. Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul 110-749, South Korea
2. Department of Physiology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul 110-749, South Korea
3. Department of Chemical and Biomolecular Engineering, Carle Illinois College of Medicine, Department of Pathobiology, Carl R. Woese Institute for Genomic Biology, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States