1. P. J. O'Donnell, C. Calvert, H. M. O. Leyser, D. J. Bowles, The Plant Laboratory, Department of Biology, University of York, P.O. Box 373, York YO1 5YW.
2. R. Atzorn, C. Wasternack, Institut für Pflanzenbiochemie (IPB), Weinberg 3, 06120 Halle (Saale), Germany.