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Immune response. A response from the body to an antigen that occurs when the antigen is identified as foreign and that induces the production of antibodies and lymphocytes capable of destroying the antigen or making it harmless.
There are three types of response systems in the immune system: the anatomic response, the inflammatory response, and the immune response. 1  The anatomic response physically prevents threatening substances from entering your body. 2  Examples of the anatomic system include the mucous membranes and the skin.