1. Department of Protein Structure, Function and Design; Graduate School of Pharmaceutical Sciences; Kyushu University; Fukuoka; 812-8582; Japan
2. Laboratory of Biological Chemistry; Faculty of Pharmaceutical Sciences; Sojo University; Kumamoto; 860-0082; Japan
3. Institute of Biophysics; Department of Bioscience and Biotechnology; Graduate School; Faculty of Agriculture; Kyushu University; Hakozaki 6-10-1; Fukuoka; 812-8581; Japan
4. Department of Molecular Biology; Graduate School of Pharmaceutical Sciences; Kyushu University; Fukuoka; 812-8582; Japan