1. Virginia Bioinformatics Institute, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
2. Department of Energy Joint Genome Institute, Walnut Creek, CA 94598, USA.
3. Genomics Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Laboratory of Phytopathology, Wageningen University, NL-6709 PD Wageningen, Netherlands.
5. Horticulture Research International, Wellesbourne, Warwick CV35 9EF, United Kingdom.