1. Department of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, Illinois 61801, Departments of Molecular and Integrative Physiology, Cell and Developmental Biology, University of Illinois, 407 South Goodwin Avenue, Urbana, Illinois 61801, Midwest Center for Structural Genomics and Structural Biology Center, Argonne National Laboratory, Argonne, Illinois 60439, Ben May Institute for Cancer Research, University of Chicago, Chicago, Illinois 60637, and Department of Biochemistry, The...