Eosinophils play an important role in intestinal inflammation and radiation-induced intestinal fibrosis by releasing cationic proteins, cytokines [e.g., interleukin (IL)-6, IL-10, and IL-13], and chemokines [e.g., C-C motif ligand (CCL)3, CCL5, and CCL17] (Radnai et al., 2016; Takemura et al., 2018). The gene discussed is IL13; the disease is fibrosis.