An immortalized primary human small airway epithelial cell (hSAEC) line was previously described.12 (link),14 (link)–18 (link) The immortalized hSAECs were grown in SAGM small airway epithelial cell growth medium (Lonza, Walkersville, MD) in a humidified atmosphere of 5% CO2. For induction of EMT, hSAECs were TGFβ stimulated for 14 d (10 ng/mL, PeproTech, Rocky Hill, NJ).14 (link)