While the expression of BDKRB1 is detected more ubiquitously in the lung (Fig. 6A, Supplementary Table S6), it is nearly 1000-fold upregulated in the macrophages of the IPF lung, as compared to those of the healthy lung (Fig. 6B, Supplementary Table S7). This evidence concerns the gene BDKRB1 and idiopathic interstitial pneumonia.