Institute of Theoretical Computer Science, Medical Systems Biology and Biology II, Ulm University, D-89069 Ulm, Germany.|Institute of Theoretical Computer Science, Medical Systems Biology and Biology II, Ulm University, D-89069 Ulm, Germany.|Institute of Theoretical Computer Science, Medical Systems Biology and Biology II, Ulm University, D-89069 Ulm, Germany.|Institute of Theoretical Computer Science, Medical Systems Biology and Biology II, Ulm University, D-89069 Ulm, Germany.