1. Department of Biological Sciences (J.-W.L., A.H.C., M.H., S.S.C., J.P., G.Y.L., J.B.K.), Seoul National University, Sillim-Dong, Kwanak-Gu, Seoul 151-742, Korea
2. Division of Endocrinology and Metabolism (J.-W.K., K.-H.Y.), Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Banpodong, Seocho-Gu, Seoul 137-040, Korea
3. Institute of Molecular Biology and Genetics and Department of Biophysics and Chemical Biology (J.B.K.), Seoul National University, Sillim-Dong, Kwanak-Gu, Seoul 151-742, Korea