[1] CNRS, Inst Biol Mol & Cellulaire, Lab Immunochim Peptides & Virus, F-67084 Strasbourg, France
[2] Scottish Crop Res Inst, Dundee DD2 5DA, Scotland
[3] Univ Missouri, Danforth Plant Sci Ctr, ILTAB, St Louis, MO 63121 USA
[4] Univ Rochester, Dept Immunol & Microbiol, Rochester, NY 14627 USA