1. Department of Biosystems Science and Engineering, ETH Zurich, Mattenstrasse 26, 4058 Basel, Switzerland
2. Institute of Biotechnology, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany
3. Faculty of Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands