Immunoglobulins are a broad spectrum of naturally active antibodies in the human body. It is a kind of protein peptide substance which is resistant to pathogenic infection. It is medically called antibody and is divided into five categories: IgG, IgA, IgD, IgE and IgM. In human body, IgG is the main antibody, accounting for 40%. Immunoglobulin IgG can resist the invasion of various pathogenic bacteria and viruses, inhibit the growth of pathogenic bacteria, help the formation of the body's own immune system, and promote the healthy growth of infants and young children. (immunoglobulin) An animal protein having antibody activity. It is mainly found in plasma and is also found in other body fluids, tissues and some secretions. Most of the immunoglobulins in human plasma are present in gamma globulin (gamma-globulin). There are five categories, namely immunoglobulin G (IgG), immunoglobulin A (IgA), immunoglobulin M (IgM), immunoglobulin D (IgD), and immunoglobulin E (IgE). Among them, IgG is the most important immunoglobulin, accounting for about 70% of human plasma gamma globulin, molecular weight of about 150,000, and sugar content of 2 to 3%. The IgG molecule consists of 4 peptide chains. A peptide chain having a molecular weight of 25,000, which is called a light chain, has a molecular weight of 50,000, and is a heavy chain. The light chain and the heavy chain are connected by a disulfide bond (—S—S—). Immunoglobulin is produced by the body after being stimulated by an antigen (such as a pathogen). Its main function is to react with the antigen to form an antigen-antibody complex, thereby blocking the damage of the pathogen to the body and causing the pathogen to lose its pathogenic effect. On the other hand, immunoglobulins sometimes have pathogenic effects. Clinical allergic symptoms such as bronchospasm caused by pollen, penicillin lead to systemic allergic reactions, skin urticaria (commonly known as rubella block), etc. are all immunoglobulin preparations can enhance the body's anti-viral ability, can be used for medicinal purposes. For example, injection of human serum or gamma globulin preparation extracted from human placenta can prevent infectious diseases such as measles and infectious hepatitis.
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