Differential expression of ferritin-H and ferritin-L has been previously reported in the goblet, ciliated and basal subtypes air–liquid interphase (ALI) cultured CF airway epithelial cells [53], suggesting that future studies of ferroptosis using ALI cultured cells may be able to explain the increased ferritin in IB3-1 cells. The gene discussed is FTH1; the disease is cystic fibrosis.