1. Department of Biochemistry, University of Zurich, Zurich CH-8057, Switzerland
2. Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
3. Université Paris Cité, CNRS, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, Paris F-75006, France
4. Department of Physics, Boston University, Boston, Massachusetts 02215, United States
5. Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215, United states