1. Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
2. BIOSS − Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
3. Faculty of Engineering, University of Freiburg, 79110 Freiburg, Germany
4. Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland