Immunoglobulin G (IgG) belongs to the immunoglobulin family and is a widely expressed serum antibody. An immunoglobulin has two heavy chains and two light chains connected by a disulfide bond. It is a glycoprotein. IgG is a major class of immunoglobulin. Mouse consists of five immunoglobulin classes- IgM, IgG, IgA, IgD and IgE. Mouse IgG is further divided into five classes- IgG1, IgG2a, IgG2b and IgG3.
Immunoglobulin G (IgG) plays a major role in hypersensitivity type II and type III reactions. IgG is also involved in opsonization, complement fixation and antibody dependent cell mediated cytotoxicity.
