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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.
Antibody â a molecule produced by the body in response to a specific antigen; for example, the presence of the poliovirus in the blood provokes the body to create amino acid molecules (antibodies) to counteract it. Antigen refers to any substance that stimulates the body to make antibodies.