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Antigen (Ag) refers to all substances that can induce an immune response in the body. That is, it can be specifically recognized and bound by the antigen receptor (TCR / BCR) on the surface of T / B lymphocytes to activate T / B cells. Proliferate and differentiate, produce immune response products (sensitized lymphocytes or antibodies), and substances that can specifically bind to the corresponding products in vivo and in vivo. Therefore, antigen substances possess two important characteristics: immunogenicity and immunoreactivity. Immunogenicity refers to the ability of an antigen to induce a specific immune response in the body to produce antibodies and / or sensitize lymphocytes; immunoreactivity refers to the ability to occur with corresponding immune effect substances (antibodies or sensitized lymphocytes) in vivo and in vivo The ability to specifically bind the reaction.