Ewha Research Center for Systems Biology (ERCSB), Ewha Womans University, Seoul, Korea.|Ewha Research Center for Systems Biology (ERCSB), Ewha Womans University, Seoul, Korea.|Interdisciplinary Program in Bioinformatics, College of Natural Science, Seoul Natl University, Seoul, Korea.|Ewha Research Center for Systems Biology (ERCSB), Ewha Womans University, Seoul, Korea.