Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, Japan. standley@protein.osaka-u.ac.jp|Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, Japan. standley@protein.osaka-u.ac.jp|Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, Japan. standley@protein.osaka-u.ac.jp