Hierarchical clustering of the differentially expressed intracellular DAMPs using Morpheus showed the dysregulated expression of intracellular DAMPs, including elevated expression of galectins (LGALS1 and LGALS1), thioredoxin (TXN and TXN2), S100 proteins (S100A3, S100A4, S100A8 and S100A9 et al), cyclophilin A (PPIA), peroxiredoxin 1(PRDX1) and heat shock proteins (HSPB1, HSPD1 and HSP90B1) in MCT‐induced PAH (Figure 5A). This evidence concerns the gene S100A9 and pulmonary arterial hypertension.