To test whether ILC2 deficiency in Hps1−/− mice also affects bleomycin-induced pulmonary fibrosis development, Rorafl/flIL-7Rcre mice, in which ILC2s are depleted (49–51), were bred with Hps1−/− mice to examine the specific roles of ILC2s in an i.p.-bleomycin model (Supplemental Figure 3A). Here, HPS1 is linked to pulmonary fibrosis.