1. Department of Chemistry, Northwestern University, Evanston, Illinois, USA
2. Center for Structural Genomics of Infectious Diseases, Consortium for Advanced Science and Engineering, University of Chicago, Chicago, Illinois, USA
3. Structure Biology Center, Argonne National Laboratory, Argonne, Illinois, USA
4. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, USA
5. Department of Molecular Biosciences, Northwestern University, Evanston, Illinois, USA