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an antigenic determinant located in an unexposed region of a molecule so that it is prevented from interacting with receptors on lymphocytes, or with antibody molecules, and is unable to induce an immune response; it may appear following stereochemical alterations of molecular structure.
What is an antigen? An antigen is any substance that is recognised as foreign and stimulates the production of antibodies, for example an antigen may be a âforeignâ protein on the surface of a bacterium. An antigen specifically induces the production of antibodies which can bind to it and neutralise it.