About the Authors

Kristen Brennand

Affiliations Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, United States of America , Harvard Stem Cell Institute, Harvard University, Cambridge, Massachusetts, United States of America , Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts, United States of America

Danwei Huangfu

Affiliations Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, United States of America , Harvard Stem Cell Institute, Harvard University, Cambridge, Massachusetts, United States of America , Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts, United States of America

Doug Melton

To whom correspondence should be addressed. E-mail: dmelton@mcb.harvard.edu

Affiliations Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, United States of America , Harvard Stem Cell Institute, Harvard University, Cambridge, Massachusetts, United States of America , Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

KB, DH, and DM conceived and designed the experiments. KB and DH performed the experiments and analyzed the data. KB wrote the paper.