About the Authors

Viola Ellison

Affiliation Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America

Bruce Stillman

To whom correspondence should be addressed. E-mail: stillman@cshl.edu

Affiliation Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

VE and BS conceived and designed the experiments. VE performed the experiments. VE and BS analyzed the data. VE contributed reagents/materials/analysis tools. VE and BS wrote the paper.