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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.
Antibodies are large Y-shaped proteins. They are recruited by the immune system to identify and neutralize foreign objects like bacteria and viruses.he specific region on an antigen that an antibody recognizes and binds to is called the epitope, or antigenic determinant. An epitope is usually made up of a 5-8 amino acid long chain on the surface of the protein.