1. United States Department of Agriculture, Agricultural Research Service, Gainesville FL 32608, USA
2. United States Department of Agriculture, Agricultural Research Service, Beltsville MD 20705, USA
3. Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
4. Department of Biochemistry and Molecular Biology, University of the Basque Country (EHU), Biophysics Institute (CSIC-UPV/EHU), B° Sarriena S/N, 48940 Leioa, Spain
5. Protein Sciences Corporation, Meriden CT 06450, USA
6. Department of Genetics, Universitat de València, Burjassot, Spain
7. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala 750 07, Sweden