1. Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011 (A.M.M., M.G.J.);
2. Commonwealth Scientific and Industrial Research Organization Plant Industry, G.P.O. Box 1600, Canberra, Australian Capital Territory 2601, Australia (M.K.M.); and
3. Unité Mixte de Recherche 8576 Glycobiologie Structurale et Fonctionnelle, Laboratoire de Chimie Biologique, Bâtiment C9, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France (S.G.B.)