In the merged dataset, expression of SMAD2 (adjusted p-value = 6.34 × 10−10, log2FC = 0.51) and TGFBR2 (adjusted p-value = 0.039, log2FC = 0.16) differed in PAH (Figure S2), although to a lesser extent. This evidence concerns the gene SMAD2 and pulmonary arterial hypertension.