WT1 fibroblasts expressed high levels of CTHRC1, POSTN, RUNX1, and several collagen genes, including COL1A1, COL1A2, COL3A1, COL4A5, COL6A3, COL14A1, and COL16A1 in patients with IPF compared with control individuals (Figure 2E). The gene discussed is COL4A5; the disease is idiopathic pulmonary fibrosis.