Stempro accutase cell dissociateion reagent

For air-liquid interface (ALI) cultures^{58 (link)}, 100,000 cultured epithelial cells per well were added to 0.4μm pore 24-well polyester membrane inserts (Corning) pre-coated with 0.03 mg/mL Type I bovine collagen solution (StemCell Technologies) with Pneumacult-Ex media (Stemcell Technologies, 05008) on both sides of the membrane. After 24 hours, apical media was changed to remove dead cells. After 72 hours, apical media was removed completely and basal media was changed to Pneumacult-ALI (Stemcell Technologies, 05001) supplemented with 5 mL 100x penicillin-streptomycin (Fisher), 1 mL 500x gentamicin/amphotericin B (ThermoFisher), 1 mL 0.2% heparin sodium salt in PBS (Stemcell Technologies) and 2.5 mL 200x hydrocortisone stock solution (Stemcell Technologies) and 0, 0.1, 1 or 10 ng/mL IL-13 (Biolegend). Basal media was changed every 2–3 days for 21 days, after which membranes were removed and cells dissociated with Stempro Accutase Cell Dissociateion Reagent (Gibco) for Seq-Well or flow cytometry. After following scRNA-seq data analysis pipelines described above, cell states recovered in ALI cultures (Fig. 5a; Extended Data Fig. 9g) were related to in vivo cell types^{59 (link)}.