1. Department of Biology and Centre for Synthetic Biology , TU Darmstadt, Schnittspahnstrasse 3, 64287 Darmstadt, Germany
2. Department of Physics , TU Darmstadt, Schlossgartenstrasse 7, 64289 Darmstadt, Germany
3. Department of Biosciences, University of Milan , via Celoria 26, 20133 Milan, Italy