Hello, dear, I am very happy to answer your question: the production of antigens requires production standards, a manufacturer registered with the industrial and commercial department, a trademark, quality certificate, etc. Some special Products such as food require a license. The production of antigen products requires production standards, a manufacturer registered with the industrial and commercial department, a trademark, quality certificate, etc. Some special products such as food require licenses. The "People's Republic of China and Domestic Product Quality Law" stipulates that there must be a Chinese factory name, Chinese factory address, phone number, license number, product logo, production date, Chinese product instructions, and if necessary, qualitative or suggestive instructions. Etc. Anything missing will be regarded as a substandard product and shall not be sold on the market. Antigens refer to all substances that can induce an immune response in the body, that is, they can be specifically recognized and combined by the antigen receptors on the surface of T lymphocytes or B lymphocytes, activating these two cells to proliferate and differentiate, and produce immune response products. Substances that can specifically bind to corresponding products in vivo and in vitro. Therefore, antigenic substances have two important properties, immunogenicity and immunoreactivity. Immunogenicity refers to the ability of an antigen to induce a specific immune response in the body, produce antibodies or sensitize lymphocytes. Immunoreactivity refers to the ability to specifically bind to the corresponding immune effector substances in vivo and in vitro.