1. Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8 St, Miami, FL 33199, USA
2. Biomolecular Sciences Institute, Florida International University, 11200 SW 8 St, Miami, FL 33199, USA
3. Structural Biology Center, Biosciences, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA