About the Authors

Paul T. Williams

ptwilliams@lbl.gov

Affiliation Life Sciences Division, Lawrence Berkeley National Laboratory, Donner Laboratory, Berkeley, California, United States of America

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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