1. University of Chicago, Department of Molecular Genetics and Cell Biology, 1103 East 57 Street, Chicago, IL 60637, USA.
2. The Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA.
3. John Innes Centre, Colney Lane, Norwich NR4 7UJ, UK.
4. The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK.
5. Cold Spring Harbor Laboratories, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.
6. Washington University Genome Sequencing Center, 4444 Forest Park Boulevard, St. Louis, MO 63108, USA.