Analysis of publicly available single-cell RNA-Seq data in the Idiopathic Pulmonary Fibrosis Cell Atlas (http://www.ipfcellatlas.com/) did not reveal substantial differences in MKP1 transcript levels in any fibroblast subtype between normal lungs and those with IPF or interstitial lung disease (Supplemental Figure 1, C and D). This evidence concerns the gene DUSP1 and interstitial lung disease.