An exploratory analysis of CMKLR1 expression in different diseases suggested a preferential expansion of CMKLR1-expressing macrophages in IPF compared to other ILD entities (i.e., chronic hypersensitivity pneumonitis, nonspecific interstitial pneumonia, unclassifiable ILD, and sarcoidosis) and COPD (fig. The gene discussed is CMKLR1; the disease is idiopathic pulmonary fibrosis.