About the Authors

Caterina A. M. La Porta

Affiliation Department of Biomolecular Science and Biotechnology, University of Milano, Milano, Italy

Stefano Zapperi


Affiliations CNR-IENI, Milano, Italy, ISI Foundation, Torino, Italy

James P. Sethna

Affiliation LASSP, Department of Physics, Cornell University, Ithaca, New York, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CAMLP. Performed the experiments: CAMLP. Analyzed the data: SZ. Wrote the paper: CAMLP SZ. Designed and solved theory: SZ JPS.