About the Authors

Patric Jern

Affiliation Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, United States of America

Jonathan P Stoye

Affiliation Division of Virology, MRC National Institute for Medical Research, London, United Kingdom

John M Coffin

To whom correspondence should be addressed. E-mail: John.Coffin@tufts.edu

Affiliation Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

PJ, JPS, and JMC conceived the study. JPS retrieved initial sequences and PJ performed bioinformatics analyses. PJ, JPS, and JMC analyzed the results and wrote the paper.