1 Department of Biology, Institute for Theoretical Biology (ITB), Humboldt-Universität zu Berlin, 10115 Berlin, Germany; Bernstein Center for Computational Neuroscience, 10115 Berlin, Germany.
2 Department of Biology, Institute for Theoretical Biology (ITB), Humboldt-Universität zu Berlin, 10115 Berlin, Germany; Bernstein Center for Computational Neuroscience, 10115 Berlin, Germany. Electronic address: s.schreiber@hu-berlin.de.