About the Authors
Institute for Theoretical Computer Science, Graz University of Technology, Graz, Austria
The authors have declared that no competing interests exist.
Conceived and designed the experiments: LB JB WM. Performed the experiments: JB. Analyzed the data: LB JB. Contributed reagents/materials/analysis tools: LB JB BN WM. Wrote the paper: LB JB BN WM. Designed network model and its theoretical analysis: LB.