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 CD8, T cells follicular helper, T cells regulatory (Tregs), Macrophages M0, and Mast cells resting compared with the control group (Supplementary Fig. 3C). The gene discussed is CD8A; the disease is idiopathic pulmonary fibrosis.