TGFB2 and idiopathic pulmonary fibrosis: We also found that the expression of TGF-β2 was significantly upregulated in the BLM-stimulated ABCs_2 of the lung-organoid model, and reanalysis of the public IPF Cell Atlas data [5] revealed that TGF-β2 was highly expressed in the ABCs of IPF lungs (Fig. 4E).