About the Authors
Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
The authors have declared that no competing interests exist.
Conceived and designed the experiments: DR NB GH IT. Performed the experiments: DR. Analyzed the data: DR NB GH AG. Contributed reagents/materials/analysis tools: DR NB GH AG IT. Wrote the paper: DR NB GH.