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IgG Illustration and Icon
IgG
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IgG. A stylized Y‑shaped antibody diagram showing two identical heavy chains and two identical light chains linked by disulfide bonds, with variable domains forming antigen‑binding sites at the tips. In immunology and protein biochemistry, this molecule (immunoglobulin G, IgG) is a glycoprotein within the humoral immune system, circulating in blood plasma and extracellular fluid. The arms represent Fab (fragment antigen‑binding) regions, while the stem depicts the Fc (fragment crystallizable) region, which mediates opsonization and complement activation and enables pathogen neutralization.
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