TSLP and helminthiasis: In accordance with EGFR expression, overnight exposure to TSLP, a cytokine expressed at sites of helminth infection (Taylor et al., 2009), restored the capability of WT but not Egfrfl/flxCd4-cre splenic T cells from H. polygyrus-infected mice to produce IL-13 in response to IL-33 (Figure 4A), demonstrating that induced EGFR expression licenses Th2 cells to produce IL-13 upon exposure to IL-33.