1. Neuro-Medicine Center, Life
Sciences Division, Korea Institute of Science and Technology, PO Box 131, Cheongryang, Seoul 130-650, Republic of Korea
2. School of Science, Korea University of Science and Technology, 52 Eoeun
dongYuseong-gu, Daejeon 305-333, Republic of Korea
3. Institute for Structural Biology (CEA-CNRS-UJF), 41 rue Jules Horowitz, 38027
Grenoble Cedex 1, France,
4. The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road,
Bearsden, Glasgow, G61 1BD, Scotland, U.K.