1. Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
2. Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
3. Department of Chemistry, Technische Universität München, München, Germany
4. Institute for Advanced Study, Technische Universität München, München, Germany
5. Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
6. Laboratory of Physical Chemistry, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland