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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 antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a foreign substance from the environment, such as chemicals, bacteria, viruses, or pollen.n antigen (from antibody-generating) or immunogen is a molecule that sometimes stimulates an immune response. The word originated from the notion that they can stimulate anti â¦ body generation.