Specifically, within the pulmonary arteries, TPα & TPβ were strongly expressed within the vascular endothelium, in both control tissue (Fig. 1a (ii), 1a (iii) & 1a (v), indicated by arrowheads) and PAH tissue (Fig. 1b (ii), 1b (iii) & 1b (v)). This evidence concerns the gene PLAT and pulmonary arterial hypertension.