1. Department of Applied Science, University of California, Davis, California 95616, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Chemistry, Georgetown University, Washington, D.C. 20057, Département Réponse et Dynamique Cellulaires (UMR 5090 CEA-CNRS-UJF), CEA-Grenoble, 38054 Grenoble, France, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, and JASRI, SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198,...