1. Department of Plant Sciences; University of California; Davis CA 95616 USA
2. Department of Evolution and Ecology; University of California, Davis; CA 95616 USA
3. Center for Computational Biology; McKusick-Nathans Institute of Genetic Medicine; Johns Hopkins University; Baltimore MD 21205 USA
4. Department of Ecology and Evolutionary Biology; University of Connecticut; Storrs CT 06269-3043 USA
5. UC Davis Genome Center; Davis CA 95616 USA
6. USDA National Clonal Germplasm Repository; Davis CA 95616 USA
7. Departments of Biomedical Engineering, Computer Science, and Biostatistics; Johns Hopkins University; Baltimore MD 21205 USA