1. Berlin Institute for Medical Systems Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association , Hannoversche Str. 28, 10115 Berlin, Germany
2. Freie Universität Berlin, Department of Mathematics and Computer Science, Institute of Computer Science , Takustraße 9, 14195 Berlin, Germany
3. Freie Universität Berlin, Department of Biology, Chemistry and Pharmacy, Institute of Chemistry and Biochemistry , Thielallee 63, 14195 Berlin, Germany