Affiliation: | The Biological Research Centre of the Hungarian Academy of Sciences, Plant Biology Institute, P.O. Box 251, H-6701 Szeged, Hungary;Department of Biology II, University of Freiburg, Schanzler-strasse 1, D-79104 Freiburg, Germany;Friedrich-Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland |