1. Department of Life Science and the Research Center for Cellular Homeostasis, Ewha Womans University, Seoul 03760, Korea
2. Korea Food Research Institute, Wanju 55365, Korea
3. Genome Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany, and Stanford Genome Technology Center and Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA
4. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
5. Department of Biomedical Sciences and Medical Science, Seoul National University College of Medicine, Seoul 03080, Korea