1. Microbiology and Cell Science Department, University of Florida, Gainesville, FL 32611, U.S.A.
2. Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, U.S.A.
3. Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
4. Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY 10595, U.S.A.
5. Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, U.S.A.
6. University of California, Davis Genome Center, Davis, CA 95616, U.S.A.