1. Department of Plant Cell Biology, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands
2. Business Unit Bioscience, Plant Research International, 6700 AA Wageningen, The Netherlands
3. Laboratory of Molecular Biology, Wageningen University, 6700 ET Wageningen, The Netherlands
4. Business Unit Biodiversity and Breeding, Plant Research International, 6700 AA Wageningen, The Netherlands
5. Centre for BioSystems Genomics, 6700 AB Wageningen, The Netherlands