Fig. 2.

CircMKLN1 expression was significantly increased in pulmonary fibrosis. a The expression of circRNAs (circMKLN1, circP4HB, circRAP1B and circUBE2G1) in the TGF-β1 and PQ groups. The reference gene β-actin was used as the internal control. *p < 0.05 vs. the control group. b and c In situ hybridization assay of circMKLN1 in the TGF-β1 and PQ groups (scale bar = 50 µm). d HE, Masson and Sirius scarlet staining analysis of lung tissue samples from IPF patients. e In situ hybridization assay of circMKLN1 in lung tissue samples from IPF patients (scale bar = 200 µm)