The violin plot of the immune cell infiltration difference demonstrated that patients with idiopathic pulmonary fibrosis had a higher level of B cells memory, Plasma cells, T cells CD4 naive, Macrophages M0, Macrophages M2 and Mast cells resting compared with the control group (Supplementary Figure S1C). This evidence concerns the gene CD4 and idiopathic pulmonary fibrosis.