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 disulfide bond. It mainly helps in immune defense. It is a glycoprotein and a major class of immunoglobulin.
Immunoglobulin G (IgG) participates in hypersensitivity type II and type III. 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. IgG helps in opsonization, complement fixation and antibody dependent cell mediated cytotoxicity.