About the Authors
MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
MRC Laboratory of Molecular Biology, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MMP WAB. Performed the experiments: MMP HGS JU. Analyzed the data: MMP JU GRG. Wrote the paper: MMP WAB.