The authors regret the UMAP legend of Supplementary Fig. S1a was incorrect. The correct legend can be seen in the figure below. The authors would like to apologise for any inconvenience caused.[Formula presented] The authors would also like to add the following file as Supplementary Data: Seurat object of epithelial cells from the mouse lower respiratory tract. Seurat object (v4.3.0) with normalized and scaled data (SCT), cell type annotation, and UMAP dimensional reduction (calculated after running harmony v0.1.1). Datasets used for this analysis are described in Supplementary Table 1.