1. Center for RNA Research, Institute for Basic Science, 08826 Seoul, South Korea.
2. Department of Biological Sciences, College of Natural Sciences, Seoul National University, 08826 Seoul, South Korea.
3. Department of Orthopedic Surgery, Seoul National University College of Medicine, Boramae Hospital, 07061 Seoul, South Korea.
4. Interdisciplinary Program in Bioinformatics, Seoul National University, 08826 Seoul, South Korea.