1. Institute of Microbiology
2. Department of Biology
3. Swiss Federal Institute of Technology
4. ETH Zürich
5. 8093 Zürich
6. Laboratory of Physical Chemistry, Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich
7. Switzerland
8. Institute of Molecular Biology & Biophysics, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich