1. Department of Plant Pathology, University of California at Davis, 1 Shields Avenue, Davis, California 95616
2. Institute of Molecular Agrobiology, 59A The Fleming, 1 Science Park Drive, Singapore 118240
3. International Laboratory for Tropical Agricultural Biotechnology, Scripps Research Institute, MRC7, 10666 North Torrey Pines Road, La Jolla, California 92037
4. Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697-2525
5. Department of Biology, San Francisco State University, 1600 Holloway Avenue, San Francisco, California 94132