1. Centre for Molecular Simulation, Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N1N4, Canada
2. Center for Nonlinear Studies, Los Alamos National Lab, Los Alamos, New Mexico 87544, United States
3. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637, United States
4. Computer-Aided Drug Design Center, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201, United States
5. School of Science, RMIT University, Melbourne, VIC 3001, Australia