Kazuaki Ouchi,¹ Atsuo Nishino,¹ Hiroki Nishida<sup>1,*

1</sup>Department of Biological Sciences, Graduate School of Science, Osaka University, Machikaneyama 1-1,

^*Corresponding author. Phone: +81-6-6850-5472; Fax : +81-6-6850-5472; E-mail: hnishida@bio.sci.osaka-u.ac.jp