1. Protein Dynamics and Flexibility, Institut de Biologie Structurale Jean-Pierre Ebel, CEA, CNRS, UJF UMR 5075, 41 Rue Jules Horowitz, Grenoble 38027, France
2. Departments of Molecular Genetics, Biochemistry, and Chemistry, The University of Toronto, Toronto, Ontario, Canada M5S 1A8
3. Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, Urey Hall, La Jolla, California 92003-0365, United States