1. Centre de Recherches sur les Macromolécules Végétales of CNRS, affiliated with the Joseph Fourier University of Grenoble, BP 53, 38041 Grenoble Cedex 9, France, Southern Regional Research Center, United States Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, Partnership for Structural Biology, Institute Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France, EPSAM/ISTM, Keele University, Keele, Staffordshire ST5 5BG, England, and Bioscience Division, Los...