About the Authors
Department of Biology, The Catholic University of America, Washington, District of Columbia, United States of America
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
Howard Hughes Medical Institute, Urbana, Illinois, United States of America
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: VBR. Performed the experiments: ZZ VIK RV LD. Analyzed the data: ZZ VIK RV LD YRC TH VBR. Wrote the paper: ZZ VIK RV TH VBR.