DPP4 and aneurysm: The expression of DPP4 in aneurysm and control media correlated with sets of mRNAs associated with numerous immune processes such as migration/chemotaxis of granulocytes, monocytes and lymphocytes, antigen presentation and those related to T- and B-cells, mast cells, macrophages, as well as extracellular matrix-, peptidase-, apoptosis-, metabolism- and oxidative stress-associated gene sets (Fig 4).