Interleukin-4, abbreviated IL-4, is a cytokine that induces differentiation of naive helper T cells (Th0 cells) to Th2 cells. Upon activation by IL-4, Th2 cells subsequently produce additional IL-4. The cell that initially produces IL-4, thus inducing Th0 differentiation, has not been identified.
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[in-ter-LOO-kin] IL-4. A type of biological response modifier (a substance that can improve the body's natural response to infection and disease) that enhances the immune system's ability to fight tumor cells. These substances are normally produced by the body. They are also made in the laboratory for use in treating cancer and other diseases.
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