Department of Bioinformatics and Life Science, Soongsil University, Seoul, 156-743, Republic of Korea.|Department of Biochemistry, College of Life Science and Technology, Yonsei University, Seoul, 120-749, Republic of Korea.|Department of Biochemistry, College of Life Science and Technology, Yonsei University, Seoul, 120-749, Republic of Korea. yjkim@yonsei.ac.kr.|Department of Bioinformatics and Life Science, Soongsil University, Seoul, 156-743, Republic of Korea. sskimb@ssu.ac.kr.