About the Authors

Ting F. Zhu

Affiliations Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts, United States of America, Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Jack W. Szostak

szostak@molbio.mgh.harvard.edu

Affiliation Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TFZ JWS. Performed the experiments: TFZ. Analyzed the data: TFZ JWS. Wrote the paper: TFZ JWS.