1. Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
2. Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Naka Ku, Sakai, Osaka 599-8570, Japan
3. National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan