1. Division
of Material Science, Graduate School of Science, Nagoya University, Furo-cho,
Chikusa-ku, Nagoya, Aichi 464-8602, Japan
2. Department
of Biological Sciences, Graduate School of Science, Osaka University, Toyanaka, Osaka 560-0043, Japan
3. Institute
for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan