1. Department
of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
2. Center
for Cellular imaging and NanoAnalytics (C−CINA), Biozentrum, University of Basel, Mattenstrasse 26, 4058 Basel, Switzerland
3. Adolphe
Merkle Institute, University of Fribourg, Rte de l’Ancienne Papeterie, P.O. Box 209, 1723 Marly, Switzerland