TGFB1 and idiopathic pulmonary fibrosis: (Control 0 h: 0.035±0.02; IPF 0 h: 0.043±0.01; Control 72 h: 0.078±0.02*; IPF 72 h: 0.084±0.03*; Control+TGF-β1 72 h: 0.122±0.04*†; IPF+TGF-β1 72 h: 0.135±0.03**††).