Monika Pepelnjak1, Natalie de Souza2, Paola Picotti3. 1. Institute of Molecular Systems Biology, Department of Biology, ETH Zurich, Zurich, Switzerland. 2. Institute of Molecular Systems Biology, Department of Biology, ETH Zurich, Zurich, Switzerland; Department of Quantitative Biomedicine, University of Zurich, Zurich, Switzerland. 3. Institute of Molecular Systems Biology, Department of Biology, ETH Zurich, Zurich, Switzerland. Electronic address: picotti@imsb.biol.ethz.ch.