About the Authors

Kate S Carroll

Affiliation Department of Chemistry, University of California, Berkeley, California, United States of America

Hong Gao

Affiliations Department of Chemistry, University of California, Berkeley, California, United States of America, Departments of Chemistry and Molecular Cell Biology, Genome Center, University of California, Davis, California, United States of America

Huiyi Chen

Affiliation Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America

C. David Stout

Affiliation Department of Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America

Julie A Leary

Affiliation Departments of Chemistry and Molecular Cell Biology, Genome Center, University of California, Davis, California, United States of America

Carolyn R Bertozzi

To whom correspondence should be addressed. E-mail: crb@berkeley.edu

Affiliations Department of Chemistry, University of California, Berkeley, California, United States of America, Departments of Chemistry and Molecular Cell Biology, Genome Center, University of California, Davis, California, United States of America, Howard Hughes Medical Institute, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

KSC conceived and designed the experiments. KSC, HG, and HC preformed the experiments. KSC, HG, CDS, JAL, and CRB analyzed the data. KSC wrote the paper.