The degree of BLM-induced lung fibrosis in this study was similar between the two genotypes, whereas previous studies have shown that intratracheally administered BLM-induced lung fibrosis in mice was attenuated by Dpp4 deficiency or treatment with the DPP4 inhibitor vildagliptin [22,30]. The gene discussed is DPP4; the disease is pulmonary fibrosis.