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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 created in response to antigens that include, but are not limited to, foreign proteins, polysaccharides, and nucleic acids. The antibody recognizes a small portion of the antigen called the antigenic determinant or epitope.hey play a great role in the immune system, and are usually found in blood and other bodily fluids. Antibodies are created by white blood cells, or more specifically, B cells. There are five isotypes of antibodies that each play self-defense role to fight off foreign objects in our body.