1. Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States
2. Department of Industrial & Systems Engineering, University of Florida, 1350 North Poquito Road, Shalimar, Florida 32579-1163, United States
3. Department of Cellular and Developmental Biology and Program in Structural Biology and Biophysics, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045, United States