To further verify the differential expression of candidate hub genes between IPF and control samples, we then established a bleomycin-induced pulmonary fibrosis mouse model and detected the expression of SLCO4A1, ASPN and SFRP2 between fibrotic lung samples and control samples from model mice (Figure 4A). The gene discussed is SLCO4A1; the disease is idiopathic interstitial pneumonia.