To investigate the role of CMKLR1 in IPF lung immune cells, we performed exploratory data analysis of two publicly available single-cell RNA sequencing (scRNA-seq) datasets of whole lungs with >300,000 immune cells: Adams et al. (20) includes 28 controls, 32 IPF, and 18 chronic obstructive pulmonary disease (COPD) lungs; Habermann et al. (21) consists of 10 control, 11 IPF, and eight assorted ILD lungs (Fig. 1, A to C). This evidence concerns the gene CMKLR1 and chronic obstructive pulmonary disease.