Laboratoire de Biologie Cellulaire, Route de St. Cyr, F-78026 Versailles Cedex, France; Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Science, S-901 83 Umeå, Sweden; and School of Biosciences, University Park, University of Nottingham, Nottingham NG7 2RD, United Kingdom(2000-12-12時点)