About the Authors
Department of Genetics, University of Cambridge, Cambridge, United Kingdom
Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CJRI AF VM. Performed the experiments: CJRI. Analyzed the data: CJRI. Contributed reagents/materials/analysis tools: CJRI. Wrote the paper: CJRI AF VM. Interpreted the results: CJRI AF VM.