1. Department of Chemistry, National Tsing-Hua University, Hsinchu 300
2. Chemical Biology and Molecular Biophysics, Taiwan International Graduate Program, Academia Sinica, Taipei 115
3. Institute of Molecular Biology, Academia Sinica, Taipei 115
4. Department of Plant Pathology and Microbiology, National Taiwan University, Taipei 106
5. Department of Life Sciences, National Chung-Hsing University, Taichung 403, Taiwan, Republic of China