1. Department of Biochemistry, School of Medicine, Vanderbilt University, Nashville, Tennessee 37232, Department of Biological Sciences, College of Arts & Science, Vanderbilt University, Nashville, Tennessee 37235, Department of Biochemistry, Drexel University, Philadelphia, Pennsylvania 19102, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada, DND-CAT Synchrotron Research Center, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439,...