$B9bED$G$9(B <200110220559.OAA27792@ml.asahi-net.or.jp>$B$N5-;v$K$*$$$F(B ssugiya@biol1.bio.nagoya-u.ac.jp$B$5$s$O=q$-$^$7$?!#(B >> >$B5a$`!*!!#3#5%_%j0&9%4(B Akira Takada takada@ipe.tsukuba.ac.jp* *$BC^GHBg3XNW>20e3X7O(B $BC^GHBg3XImB0IB1!0eNE>pJsIt(B* **************************************************