About the Authors

Cédric Norais

Contributed equally to this work with: Cédric Norais, Michelle Hawkins

Affiliations Institut de Génétique et Microbiologie, Université Paris-Sud, Orsay, France , CNRS, UMR8621, Orsay, France

Michelle Hawkins

Contributed equally to this work with: Cédric Norais, Michelle Hawkins

Affiliation Institute of Genetics, University of Nottingham, Nottingham, United Kingdom

Amber L Hartman

¤ Current address: Departments of Evolution and Ecology and Medical Microbiology and Immunology, The Genome Center, University of California Davis, Davis, California, United States of America

Affiliation Johns Hopkins University, Baltimore, Maryland, United States of America

Jonathan A Eisen

¤ Current address: Departments of Evolution and Ecology and Medical Microbiology and Immunology, The Genome Center, University of California Davis, Davis, California, United States of America

Affiliation The Institute for Genomic Research, Rockville, Maryland, United States of America

Hannu Myllykallio

To whom correspondence should be addressed. E-mail: hannu.myllykallio@igmors.u-psud.fr (HM); thorsten.allers@nottingham.ac.uk (TA)

Affiliations Institut de Génétique et Microbiologie, Université Paris-Sud, Orsay, France , CNRS, UMR8621, Orsay, France

Thorsten Allers

To whom correspondence should be addressed. E-mail: hannu.myllykallio@igmors.u-psud.fr (HM); thorsten.allers@nottingham.ac.uk (TA)

Affiliation Institute of Genetics, University of Nottingham, Nottingham, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

CN, MH, HM, and TA conceived and performed the experiments. JAE sequenced the H. volcanii genome. CN, ALH, JAE, and HM analyzed the genome data. CN, MH, ALH, JAE, HM, and TA wrote the paper. CN and MH contributed equally to the work.