Asan Institute for Life Sciences, Asan Medical Center, Seoul 138-736, Korea.|Department of Chemistry, Seoul National University, Seoul 151-747, Korea.|Department of Convergence Medicine.|Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Seoul 138-736, Korea.|Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Seoul 138-736, Korea.|Asan Institute for Life Sciences, Asan Medical Center, Seoul 138-736, Korea.