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Antigens and Antigen Receptors

What is antigen and antiggen receptor and how its work? Antigens and Antigen Receptors Antigens have two important characteristics: immunogenicity and reactivity. Immunogenicity is the ability to provoke an immune response by stimulating the production of specific antibodies, the proliferation of specific T cells, or both. The term antigen derives from its func- tion as an antibody generator. Reactivity is the ability of the antigen to react specifically with the antibodies or cells it provoked. Strictly speaking, immunologists define antigens as substances that have reactivity; substances with both immunogenicity and reactivity are considered complete antigens. Commonly, however, the term antigen implies both immunogenicity and reactivity, and we use the word in this way.  Entire microbes or parts of microbes may act as antigens. Chemical components of bacterial structures such as flagella, capsules, and cell walls are antigenic, as are bacterial toxins. Nonmicrobial examples ...