1. Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
2. Department of Dental Science; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
3. Department of Oral Anatomy; Research Institute of Oral Science; College of Dentistry; Gangneung-Wonju National University; Gangwondo 210-702 Korea
4. Department of Pharmacology; Research Institute of Oral Science; College of Dentistry, Gangneung-Wonju National University; Gangwondo 210-702 Korea
5. Department of Oral and Maxillofacial Surgery; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea