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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.
BLOOD BANK ANTIGENS AND ANTIBODIES. Antigens are defined as substances recognized by the body as foreign, causing the body to produce an antibody to react specifically with it. In order to be an antigen to you it must be foreign (not found in the host): THE MORE FOREIGN THE BETTER ANTIGEN! Autologous antigens are your own antigens (not foreign to you)