About the Authors

Claude Gérard
Albert Goldbeter

agoldbet@ulb.ac.be

Affiliation Faculté des Sciences, Université Libre de Bruxelles (ULB), Campus Plaine, CP 231, Brussels, Belgium

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CG AG. Performed the experiments: CG. Analyzed the data: CG AG. Wrote the paper: CG AG.