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IL-4 is a cytokine secreted by type 2 T helper cells, mast cells, and basophils. It has an immune function and is an anti-inflammatory factor. Besides, it also plays a central role in regulating antigen-stimulated initial T cell differentiation, causing T cells to produce cytokines such as IL-10, IL-14, and inhibiting CD4+ T cells from secreting IFN-γ. It can only exert its biological activity if it binds to a specific receptor on the membrane of the target cell.