IL11 and pulmonary fibrosis: Although our data on Sftpc-CreER;Il11fl/fl mice demonstrated that the specific deletion of Il11 in AT2 cells only was not sufficient to protect mice against lung fibrosis, we did not dissect other cell type(s) expressing IL11 that can impact AT2-to-AT1 differentiation and fibrosis, despite our earlier studies suggesting a dominant role for IL11 secretion from fibroblasts for fibrosis phenotypes25.