1. The Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305
2. Biology Department, Duke University, Durham, North Carolina 27708
3. Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108
4. Department of Energy, Joint Genome Institute, Walnut Creek, California 94598
5. Boyce Thompson Institute, Cornell University, Ithaca, New York 14853
6. CNRS, UPR 1261 Institut de Biologie Physico-Chimique, 75005 Paris, France