Editors' page

This issue of the Journal witnesses the introduction of a new feature, relating to in-depth analysis of mechanisms of disease. This section will include a series of commissioned articles by experts in the field. Each series will deal with different molecular mechanisms and clinical implications of specific signaling pathways contributing to an important disease process. The inaugural series deals with pulmonary arterial hypertension, starting with the Role of Endothelin Receptors, by Adrian Chester and colleagues, published in this issue, to be followed by the role of equally important pathways contributing to this important disease to be published in future issues. It is hoped that these series will contribute to our aim of presenting the latest knowledge regarding science and practice which will be of interest to a wide spectrum of our readership. Bloomsbury Qatar Foundation Journals. This is an open access article distributed under the terms of the Creative Commons Attribution license CC BY 4.0, which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited.