1. Laboratoire Mixte Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique-Aventis, Aventis CropScience, Lyon, France (K.G., C.J., D.J.);
2. Plant Research International, Wageningen, The Netherlands (S.P.C.G.); and
3. Flanders Interuniversity Institute for Biotechnology and Department of Biochemistry, Gent University, Gent, Belgium (M.P., H.D., J.V.)