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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.
Noun. 1. immune system-a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response. system-a group of physiologically or anatomically related organs or parts; the body has a system of organs for digestion.