1. Plant Pathology, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
2. Laboratory for Phytopathology, Wageningen University, 6708 PB, Wageningen, The Netherlands
3. Centre for BioSystems Genomics, 6700 AB, Wageningen, The Netherlands
4. Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands