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Receptors, IgG: Specific molecular sites on the surface of various cells, including B-lymphocytes and macrophages, that combine with Immunoglobulin Gs. Three subclasses exist: Fc gamma Ri (the Cd64 antigen, a low affinity receptor), Fc gamma Rii (the Cd32 antigen, a high affinity receptor), and Fc gamma Riii (the Cd16 antigen, a low affinity receptor).
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