TGFB1 and pulmonary fibrosis: It has been published that IL-13-mediated increases in lung fibrosis by a transgene expressing mouse was facilitated by TGF-β1 and can be reduced by blocking the activation of TGF-β17, however we did not find any increase in TGF-β levels after IL-13 stimulation nor the TGF-β activation protein TSP-119.