1. Department of Biochemistry, University of Illinois at Urbana-Champaign, Roger Adams Laboratory, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
2. Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Roger Adams Laboratory, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
3. Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 W. Gregory Drive, Urbana, Illinois 61801, United States