To investigate whether the heterogeneity of CMKLR1 expression may be leveraged to identify distinct inflammatory endotypes of IPF, we analyzed the BAL transcriptome of patients with CMKLR1 expression above versus below the median value, which revealed numerous differentially expressed genes between the two groups (Fig. 7B and data file S3). Here, CMKLR1 is linked to idiopathic pulmonary fibrosis.