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| One of a group of related proteins made by leukocytes (white blood cells) and other cells in the body. IL-4 is made by a type of T cell (white blood cell that attacks virus-infected cells, foreign cells, and cancer cells). It causes B lymphocytes to increase and to make antibodies and also increases the production of T cells. IL-4 made in the laboratory is being used as a biological response modifier to boost the immune system in cancer therapy. IL-4 is a type of cytokine. Also called interleukin-4. |
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