As a result, H&E staining, Masson staining and the Ashcroft score all indicated that Axl specifically knockout in MoMs could aggravate pulmonary fibrosis, while Axl specifically knockout in fibroblasts could alleviate pulmonary fibrosis on Day 21 after BLM administration in mice (Figure 6A,B). The gene discussed is AXL; the disease is pulmonary fibrosis.