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特許 権利維持 In immunology, an antigen (Ag), or antibody generator, is any substance which provokes an adaptive immune response.[1] An antigen is often foreign or toxic to the body (for example, a bacterium) which, once in the body, attracts and is bound to a respective and specific antibody. That is to say, an antigen is a molecule that also induces an immune response in the body.