IgG ELISA kits are assays designed to detect immunoglobulin G (IgG), a class of antibody. IgG has two identical antigen-binding sites and consists of two light chains and two heavy chains. The most abundant type of immunoglobulin in humans, it is produced by B cells. Human IgG has 4 subclasses – IgG1, IgG2, IgG3 and IgG4. The main function of IgG is the mediation of humoral immunity, providing protection against microbial pathogens. It does so through several mechanisms, including activation of the complement pathway, agglutination, and antibody-dependent cell-mediated cytotoxicity. It is the only antibody type that can be transferred through the placenta. IgG kits can be used to study the immune response against various infections. Visit the supplier page to learn more, including details on detection, sensitivity, and origin.