IL33 and chronic myelogenous leukemia, BCR-ABL1 positive: Notably, IL-33 localized to the intestinal epithelial cell layer, as demonstrated by both western blot (Fig. 7k, l, Supplementary Fig. 7k) and immunofluorescence staining (Supplementary Fig. 7i, j), indicating that CML induced the production of epithelial-derived IL-33.