1. Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755
2. Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Kannapolis, North Carolina 28081
3. Genomics Unit, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones Científicas, Darwin 3, 28049 Madrid, Spain
4. Department of Plant Molecular Genetics, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones Científicas, Darwin 3, 28049 Madrid, Spain
5. Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599