About the Authors

Sam P. Brown

To whom correspondence should be addressed. E-mail: sam.brown@cantab.net

Affiliation Section of Integrative Biology, University of Texas at Austin, Austin, Texas, United States of America

François Taddei

Affiliation University Paris 5, Institut National de la Sante et de la Recherche Medicale, U571, Paris, France

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived the project and wrote the paper: SPB FT. Performed the model development and analysis: SPB. SB.