About the Authors
Department of Systems Biology, Harvard Medical School, Boston, Massachusetts, United States of America
Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CMA HN RRN TDL SGM JCW PAS. Performed the experiments: CMA HN RRN TDL. Analyzed the data: CMA HN RRN TDL. Wrote the paper: CMA.