1. School of Plant Sciences, University of Arizona, Tucson, Arizona, USA
2. Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
3. INRA, UR0407 Pathologie Végétale, Montfavet, France
4. Plant Sciences and Plant Pathology Department, Montana State University, Bozeman, Montana, USA
5. Carolina Center for Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
6. Howard Hughes Medical Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA