1. Centre for Molecular Simulation, Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada
2. Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
3. Department of Physics and Astronomy, Calvin University, Grand Rapids, Michigan 49546, United States
4. Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
5. Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada