About the Authors
- Philip A. Romero
- Frances H. Arnold
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* E-mail: 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
Analyzed the data: PAR FHA. Wrote the paper: PAR FHA.