1Department of Oral Biology, College of Dentistry, Yonsei University, Korea.
2Department of Oral Biology, Brain Korea 21 Project and Oral Science Research Center, College of Dentistry, Yonsei University, Korea.
3Genome Research Center, Korea Institute of Bioscience & Biotechnology, Korea.
Corresponding author: Yun-Jung Yoo, Department of Oral Biology, Oral Science Research Center and Brain Korea 21 Project, College of Dentistry, Yonsei University, Shinchondong 134, Seodaemoongu, Seoul, 120-752, Korea. yu618@yumc.yonsei.ac.kr