About the Authors

Katie Brenner

Affiliation Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, United States of America

Frances H. Arnold

frances@cheme.caltech.edu

Affiliation Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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