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antigen [2018/02/26 18:10] (current)
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|+||An '''antigen''' is any foreign or unrecognised substance that is capable of inducing an immune response, usually involving the production of [[antibodies]] which bind to, and disable, the antigen. Antigen may be a protein, protein fragment, or even metallic particles (for example, due to wearing of a metallic hip replacement). When an antigen is injected into the bloodstream, as through vaccination, it causes the body to produce [[antibodies]].|