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Related to immunoglobulin G: immunoglobulin M
n. Abbr. IgG
1. The most abundant class of antibodies in blood and tissue, serving to promote phagocytosis of pathogens, neutralize toxins, and activate the complement system. Immunoglobulin G antibodies are the only antibodies that pass from mother to fetus through the placenta.
2. An antibody of this class.
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|Noun||1.||immunoglobulin G - one of the five major classes of immunoglobulins; the main antibody defense against bacteria|