About the Authors
The Wellcome Trust Sanger Institute, The Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AMJ LJH GD RAK. Performed the experiments: AMJ LJH SC DG. Analyzed the data: AMJ LJH KEH AJG PM GD RAK. Wrote the paper: AMJ LJH RAK.