Reanalysis of single-cell sequencing data confirmed TDO2 expression in IPF patient myofibroblasts (Figure 6A); however, we did not detect appreciable expression of IDO1 in human myofibroblasts, and overall expression of IDO1 was shown to decrease in the lungs of fibrotic mice while expression of TDO2 increased (Figure 7, A and B). The gene discussed is IDO1; the disease is idiopathic pulmonary fibrosis.