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Immunoglobulin, also known as antibody, which produced by plasma cells , is a large Y-shape protein. There are five isotypes in placental mammals, which are IgA, IgD, IgE, IgG, and IgM. The immune system, which is highly complex and exceedingly specific, uses these glycoprotein molecules to identify and neutralize particular antigens, such as bacteria and viruses.
