1. Department of Biological Sciences, BioDiscovery Institute, University of North Texas, Denton, Texas.
2. The Alexander Silberman Institute of Life Science, The Wolfson Institute for Applied Structural Biology, Hebrew University of Jerusalem, Jerusalem, Israel.
3. Departments of Physics and Astronomy, Chemistry and Biosciences, Center for Theoretical Biological Physics, Rice University, Houston, Texas.
4. Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California.