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Antigens - Antigens antigens,alsoreferred toasimmunogens.,...

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Antigens Immune responses are directed at a series of foreign substances known as  antigens , also referred  to as  immunogens.  Most antigens are high molecular weight substances, but low molecular weight  substances will also act as antigens if they bind to proteins in the body. The low molecular weight  compound is referred to as a  hapten.  The resulting conjugate may induce an immune response  directed against the antigen.  The uptake and processing of antigens by macrophages in the tissue is an initial, critical step in most  immune responses. The simple act of taking foreign substances into the body does not necessarily  invoke an immune response because the substances may be broken down before they are ingested  by macrophages. Antigenic determinants.  The chemical groups on the antigen molecules that determine their  immunogenicity are called 
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