1. Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
2. United States Department of Agriculture, Agricultural Research Service, Molecular Plant Pathology Laboratory, Beltsville, MD, USA
3. Biology Centre, CAS, v. v. i., Institute of Plant Molecular Biology, Branišovská, České Budějovice, Czech Republic