About the Authors
Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
Division of Biology, California Institute of Technology, Pasadena, California, United States of America
The authors have declared that no competing interests exist.
MS, RJD, and CVR conceived and designed the experiments. MS and TT performed the experiments. MS and TT analyzed the data. XIA and RJD contributed reagents/materials/analysis tools. MS, RJD, and CVR wrote the paper.