1. Department of Biology, East Carolina University, Greenville, North Carolina 27858
2. Center for Bioinformatics and Computational Biology, University of Delaware, Newark, Delaware 19714
3. Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19711
4. Pioneer, A Dupont Company, Johnston, Iowa 50131
5. Plant Gene Expression Center and University of California-Berkeley, Albany, California 94710