1. Department of Biochemistry, Molecular Plant Biology; University of Turku; FI-20014 Turku Finland
2. Molecular Plant Sciences; Ludwig-Maximillians-Universität München, Biozentrum; Grosshaderner Straße 2-4 82152 Planegg-Martinsried Germany
3. Institute of Plant Biology; Biological Research Centre of the Hungarian Academy of Sciences; P.O. Box 521 H-6701 Szeged Hungary