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Interleukin 21 (IL-21), is a cytokine that has potent regulatory effects on cells of the immune system, including natural killer (NK) cells and cytotoxic T cells that can destroy virally infected or cancerous cells.  This cytokine induces cell division/proliferation in its target cells. IL-21 elicits its effects on immune cells by interacting with a cell surface receptor known as the interleukin 21 receptor, IL-21R, that is expressed in bone marrow cells and various lymphocytes.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Interleukin_21". A list of authors is available in Wikipedia.|