TGFB1 and idiopathic pulmonary fibrosis: (A) Dot plots with median showing the mRNA expression of PRRX1a (black) and PRRX1b (white) isoforms in control (circle) and IPF (square) primary Human lung fibroblasts stimulated for 48 hr with TGF-β1 (left; n=11 control HLF, n=7 IPF HLF), PGE2 (middle; n=7 control HLF, n=6 IPF HLF) compared to basal condition (red dashed line).