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Tracer Illustration and Icon
Tracer
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A schematic of a Y-shaped antibody (immunoglobulin G, IgG) with two fragment antigen-binding (Fab) arms and a central fragment crystallizable (Fc) region, each arm bound to a small labeled ligand acting as a tracer. The figure depicts a protein molecule within the immune system hierarchy, relevant to immunology and biochemistry. The labeled ligands represent fluorescent or radiolabeled tags used in immunoassays, including radioimmunoassay (RIA) and enzyme-linked assays, to detect and quantify target antigens.
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