1. Plant Nematode Genetics Group, Department of Plant Pathology, North Carolina State University, Box 7616, Raleigh, North Carolina 27695;
2. The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom;
3. Institute of Molecular Biology and Biochemistry, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;