About the Authors
Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
University of Plovdiv, Plovdiv, Bulgaria
Molecular Biology Department, Memorial Sloan Kettering Institute, New York, New York, United States of America
The Rockefeller University, New York, New York, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YT AS. Performed the experiments: YT SD. Analyzed the data: YT SD XZ AS. Contributed reagents/materials/analysis tools: XL NJH XZ. Wrote the paper: YT XZ AS.