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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.
Any substance foreign to the body that invokes an immune response either alone or after forming a complex with a larger molecule (as a protein) and that is capable of binding with a product (an antibody or a T cell) of the immune response. Antiseptic.