免疫球蛋白(Immunoglobulin,Ig)是抗体的表现形式和物质基础,原称γ球蛋白(丙球)。1972年世界卫生组织规定用Ig代替γ。Ig的基本结构为两条轻链和两条重链。重链有5类,即γ、α、μ、δ和ε。根据重链的不同,将Ig依次分为IgG、IgA、IgM、IgD和IgE五类。五类Ig中,IgG含量最多,血清中80％的抗细菌、抗病毒、抗毒素抗体为IgG。其次 Immunoglobulin (Ig) is the manifestation of the antibody and material basis, formerly known as gamma globulin (B). In 1972, the World Health Organization stipulated that Ig should be used instead of γ. The basic structure of Ig is two light chains and two heavy chains. There are five types of heavy chain, that γ, α, μ, δ and ε. According to the different heavy chains, Ig is divided into IgG, IgA, IgM, IgD and IgE five categories. Five types of Ig, the highest content of IgG, serum anti-80%, anti-virus, anti-toxin antibody IgG. Second