library_construction_protocol: Lungs were dissociated by dispase inflation as described (doi.org/10.1038/protex.2015.017). Single cell suspensions were sorted for live, CD45-, CD31-, Epcam+ epithelial cells. Sorted cells counted and loaded onto separate lanes of a Chromium Next GEM Chip (10x Genomics). Chromium Single Cell 3' v3.1 (10x Genomics) reagents were used for library preparation according to the manufacturer's protocol. The libraries were sequenced on an Illumina NovaSeq 6000 S4 flow cell.