About the Authors
Institutes of Evolutionary Biology and Immunology and Infection Research, University of Edinburgh, Edinburgh, United Kingdom
The Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
KF, CC, MJ, MAQ, JP, and MB conceived and designed the experiments. KF, CC, MJ, MAQ, NEH, and JP performed the experiments. KF, CC, MJ, JP, and MB analyzed the data and wrote the paper.