Department of Bioinformatics, Biocenter, University of Würzburg, Am Hubland, Würzburg 97074, Germany. joerg.schultz@biozentrum.uni-wuerzburg.de.|Department of Bioinformatics, Biocenter, University of Würzburg, Am Hubland, Würzburg 97074, Germany. joerg.schultz@biozentrum.uni-wuerzburg.de.|Department of Bioinformatics, Biocenter, University of Würzburg, Am Hubland, Würzburg 97074, Germany. joerg.schultz@biozentrum.uni-wuerzburg.de.|Laboratory of Phytopathology, Wageningen University & Research Centre, P,O, Box 16, 6700 AA Wageningen, The Netherlands. pierre.dewit@wur.nl.