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Interleukin, generic term for a group of proteins, formed in white blood cells known as leucocytes, that activate the body's immune system. There are 3 types of interleukin: IL-1, IL-2, and IL-3. All 3 act in concert to remove or destroy any harmful bacteria or foreign substance that invades the body.

See also: Immunity.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Inert gas to Jaruzelski, Wojciech