Antigen and antibody are two different substances, which can be distinguished by the following aspects: 1. Definition: Antigen is a substance that can induce the body to produce an immune response, including pathogens, proteins on the cell surface, polysaccharides, etc; Antibody is a special protein produced by the immune system of the body, which can specifically bind to antigen. 2. Structure: antigens are usually macromolecular complexes, such as proteins, polysaccharides or lipids; Antibodies are Y - shaped knots consisting of two heavy chains and two light chains ..
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