1. Department of Biosystems Science and Engineering, ETH Zürich, CH-4058 Basel, Switzerland
2. Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland
3. Department of Computer Science, ETH Zürich, CH-8092 Zürich, Switzerland
4. Department of Informatics, University of Zurich, CH-8050 Zürich, Switzerland
5. Biozentrum, University of Basel, CH-4056 Basel, Switzerland