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Abstract
Interleukin-4 (IL-4) is a cytokine produced by TH2 type helper T cells and by mast cells, basophils, and eosinophils. This cytokine can elicit many responses, some of which are associated with allergy and asthma. Studies with long-term cell lines and primary cells have revealed differences in the signaling between these two experimental systems. Understanding these differences is important because therapeutic strategies targeting IL-4 and its signaling pathways are currently being tested to treat allergy and asthma.
