About the Authors

William J. Riehl

Affiliation Program in Bioinformatics and Systems Biology, Boston University, Boston, Massachusetts, United States of America

Paul L. Krapivsky

Affiliation Department of Physics, Boston University, Boston, Massachusetts, United States of America

Sidney Redner

Affiliation Department of Physics, Boston University, Boston, Massachusetts, United States of America

Daniel Segrè

dsegre@bu.edu

Affiliations Program in Bioinformatics and Systems Biology, Boston University, Boston, Massachusetts, United States of America, Department of Biology, Boston University, Boston, Massachusetts, United States of America, Department of Biomedical Engineering, Boston University, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WJR PLK SR DS. Performed the experiments: WJR. Analyzed the data: WJR PLK SR DS. Wrote the paper: WJR DS.