1. Biosystematics Group, Wageningen University & Research , P.O. Box 16, Wageningen, 6700 AA , The Netherlands
2. Bioinformatics Group, Wageningen University & Research , P.O. Box 633, Wageningen, 6700 AP , The Netherlands
3. Bioscience, Wageningen University & Research , P.O. Box 16, Wageningen, 6700 AA , The Netherlands
4. Laboratory of Genetics, Wageningen University & Research , P.O. Box 16, Wageningen, 6700 AA , The Netherlands
5. The Genome Center, Genome & Biomedical Sciences Facility, University of California, Davis , 451 East Health Sciences Drive, Davis, CA 95616-8816 , USA
6. Centre for Genetic Resources, the Netherlands (CGN), Wageningen University & Research , P.O. Box 16, Wageningen, 6700 AA , The Netherlands
7. Plant Breeding Group, Wageningen University & Research , P.O. Box 386, Wageningen, 6700 AJ , The Netherlands