1. Chemistry Department, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
2. Institute of Molecular Systems Biology and Department of Health Sciences and Technology, ETH Zürich, Otto-Stern-Weg 3, 8093 Zürich, Switzerland.
3. Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland.