Immunoglobulin G is the main antibody found in humans. It is part of the adaptive immune system (see below). When an IgG antibody recognizes an antigen, it forms a so-called Circulating Immune Complex (CIC) and attracts phagocytes to destroy this CIC. IgG is divided into four sub-classes, IgG1, IgG2, IgG3 and IgG4 (see below). When an IgG binds to its antigen, the shape of the IgG changes and can be recognised by IgG receptors (see below)

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