About the Authors
Department of Biomolecular Science and Biotechnology, University of Milano, Milano, Italy
CNR-IENI, Milano, Italy
ISI Foundation, Torino, Italy
LASSP, Department of Physics, Cornell University, Ithaca, New York, United States of America
The authors have declared that no competing interests exist.
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.