IGFBP5 and idiopathic pulmonary arterial hypertension: (D) Immunoflourescent and in situ hybridization localization of PASMC (ACTA2, RGS5, and IGFBP5) and PAAF markers (PDGFRA, ADH1C, CFD, and SCARA5) in IPAH human lungs (n = 5).