About the Authors
Department of Bioengineering, University of California, Berkeley, California, United States of America
School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America
The authors have declared that no conflicts of interest exist.
CVR, JRK, and APA conceived and designed the experiments. CVR performed the experiments. CVR and JRK analyzed the data. CVR and APA contributed reagents/materials/analysis tools. CVR wrote the paper.