About the Authors

John Gatfield

john.gatfield@actelion.com

Affiliation Actelion Pharmaceuticals Ltd., Allschwil, Switzerland

Celia Mueller Grandjean

Affiliation Actelion Pharmaceuticals Ltd., Allschwil, Switzerland

Thomas Sasse

Affiliation Actelion Pharmaceuticals Ltd., Allschwil, Switzerland

Martine Clozel

Affiliation Actelion Pharmaceuticals Ltd., Allschwil, Switzerland

Oliver Nayler

Affiliation Actelion Pharmaceuticals Ltd., Allschwil, Switzerland

Competing Interests

All authors are employees of Actelion Pharmaceuticals Ltd. Bosentan is a marketed product of Actelion Pharmaceuticals Ltd., macitentan is a product in development by Actelion Pharmaceuticals, and both compounds are under protection by patents licensed in or held by Actelion Pharmaceuticals Ltd. (bosentan: patent family corresponding to EP 526708 (F. Hoffmann-La Roche AG); macitentan: patent family corresponding to WO 02/053557 (Actelion Pharmaceuticals Ltd)). This does not alter the authors’ adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JG. Performed the experiments: CMG TS. Analyzed the data: CMG TS JG. Wrote the paper: JG ON MC.