About the Authors

James A. Stapleton

Affiliation Department of Chemical Engineering, Stanford University, Stanford, California, United States of America

James R. Swartz

jswartz@stanford.edu

Affiliations Department of Chemical Engineering, Stanford University, Stanford, California, United States of America, Department of Bioengineering, Stanford University, Stanford, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JAS JRS. Performed the experiments: JAS. Analyzed the data: JAS JRS. Contributed reagents/materials/analysis tools: JRS. Wrote the paper: JAS.