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E-mail: dcutler@genetics.emory.edu
Conceived and designed the experiments: DJC HRJ.
Performed the experiments: DJC HRJ.
Analyzed the data: DJC HRJ.
Contributed reagents/materials/analysis tools: DJC HRJ.
Wrote the paper: DJC HRJ.
Michael Edward Zwick, Editor
We thank A Locke and Y Jakubek for informative discussions and F Spencer, A McCallion, A Chakravarti and J Mendell for helpful suggestions.
The authors have declared that no competing interests exist.
This work was supported by a grant from the NIH (National Institutes of Health) to D Cutler (5R01HG003461-05).
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
© 2013 Johnston, Cutler.