Affiliation: | (1) Agrotechnological Research Institute (ATO-DLO), P.O. Box 17, 6700 AA Wageningen, The Netherlands;(2) Department of Molecular Cell Biology, University of Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands;(3) Present address: Department of Molecular Cell Biology, University of Amsterdam, Kruislaan 318, NL-1098 SM Amsterdam, The Netherlands |