Deranged purine metabolism in fibroblasts derived from the pulmonary artery of health donors (CTRL) and PH patients (PH), as represented by heat maps (blue to red = low to high levels of Z score normalized metabolite abundances, n = 4) in (A). PLS-DA of PH-Fibs is shown in B, based on purine metabolite levels. In C, an overview of purine metabolism and oxidation cascades. Metabolites from this pathway are highlighted in D. (*, **, *** p <0.05, 0.01, 0.001, respectively; n = 4).