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, activate T/B cells, make them proliferate and differentiate, produce immune response products (sensitized lymphocytes or antibodies), and can Substances that specifically bind to the corresponding product in vitro and in vivo. Therefore, antigenic substances possess two important properties: 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 sensitized lymphocytes; immunoreactivity refers to the ability to interact with corresponding immune effector substances (antibodies or sensitized lymphocytes) in vitro and in vivo The ability of specific binding reactions.
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