1. Laboratory of Biochemistry, Faculty of Science, Kochi University, Kochi 780-8520, Japan
2. Hokkaido University of Education at Asahikawa, Asahikawa, Hokkaido 070-0825, Japan
3. Department of Biological Science and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306-4370, U.S.A.