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From Wikipedia, the free encyclopedia. An epitope, also known as antigenic determinant, is the part of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. For example, the epitope is the specific piece of the antigen to which an antibody binds. The part of an antibody that binds to the epitope is called a paratope.
1. An antigen is defined as a substance that reacts with antibody molecules and antigen receptors on lymphocytes. 2. An immunogen is an antigen that is recognized by the body as non-self and stimulates an adaptive immune response.3. Chemically, antigens are large molecular weight proteins and polysaccharides.4.n antigen is defined as a substance that reacts with antibody molecules and antigen receptors on lymphocytes. 2. An immunogen is an antigen that is recognized by the body as non-self and stimulates an adaptive immune response.