1. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Kusung-Dong, Yusung-Gu, Daejon 305-701, Korea.
2. Bioanalysis and Biotransformation Research Center, Korea Institute of Science and Technology, Post Office Box 131, Cheongryang, Seoul 130-650, Korea.
3. Department of Biochemistry, Uppsala University, Biomedical Center, Box 576, SE-751 23 Uppsala, Sweden.
4. Department of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, PA 16802, USA.