INTERLEUKIN-2

Interleukin-2 (IL-2) is an interleukin, or hormone of the immune system that is instrumental in the body's natural response to microbial infection and in discriminating between foreign (nonself) and self. IL-2 mediates its effects by binding to IL-2 receptors, which are expressed by lymphocytes, the cells that are responsible for immunity.
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A type of interleukin, a chemical messenger, a substance that can improve the body’s response to disease. It stimulates the growth of certain disease-fighting blood cells in the immune system. Also called IL-2.

[in-ter-LOO-kin]
IL-2. A type of biological response modifier (a substance that can improve the body's natural response to infection and disease) that stimulates the growth of certain disease-fighting blood cells in the immune system. These substances are normally produced by the body. Aldesleukin is IL-2 that is made in the laboratory for use in treating cancer and other diseases.