1. Laboratory of Molecular Physiology, Department of Life Science, College of Natural Sciences, Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, Korea.
2. Division of Life and Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Korea.
3. Samyang Corporation, Daejeon 305-717, Korea.
4. Graduate School of New Drug Discovery and Development, Chungnam National University, Daejon 305-764, Korea.