To identify the source of TSLP during cutaneous leishmaniasis, we sorted CD45+ hematopoietic and CD45- nonhematopoietic cells from the ears of either naïve or infected WT and eoCre: Il4/13f/f mice having a selective deficiency of IL-4/IL-13 in eosinophils. The gene discussed is TSLP; the disease is cutaneous leishmaniasis.