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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.
An antibody is a protein used by the immune system to identify and neutralise foreign objects like bacteria and viruses. Each antibody recognises a specific antigen unique to its target. Production of antibodies is referred to as the humoral immune system.he part of the antigen that antibody binds to is called the antigenic determinant, antigenic site or epitope. A given organism contains many different antigens. Viruses can contain as few as three (polyoma virus) to more than 100 (herpes and pox), whereas protozoa, fungi and bacteria contain hundreds to thousands.