From the Laboratory of Plant Genetics and Evolution, Hokkaido University, Sapporo, Japan (Fujlta, Ohara, and Shlmamoto) and the Division of Ufe Learning, Atsuma Board of Education, Atjuma, Japan (Okazakl) M. Ohara Is currently at the Department of Biology, Graduate School of Arts and Sciences, University of Tokyo, Komaba, Tokyo 153, Japan. The authors thank Y. Fujll and T. Mlsawa for assistance In the Geld and Dr. K. Ishkla for valuable comments on data analysis. The present study was supported In part by grant no. 06041003 from the Monbusho International Scientific Research Program. Thanks are also due to two anonymous referees for their constructive comments, by which the present article was much Improved.
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