Which is the most abundant immunoglobulin in mammalian serum?

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Multiple Choice

Which is the most abundant immunoglobulin in mammalian serum?

Explanation:
IgG is the most abundant immunoglobulin in mammalian serum. It remains in circulation longer than other isotypes thanks to recycling by the neonatal Fc receptor, giving it a long half-life and allowing large quantities to accumulate in the blood. Its monomer form is small and versatile, circulating freely to provide systemic immunity through neutralization of pathogens, opsonization to enhance phagocytosis, and activation of the classical complement pathway. In contrast, IgA is mainly found in secretions and mucosal surfaces, IgM is produced early and often exists as a pentamer with higher local activity in initial responses, and IgD and IgE are present in much lower concentrations in serum. These factors together make IgG the predominant circulating antibody in most mammals.

IgG is the most abundant immunoglobulin in mammalian serum. It remains in circulation longer than other isotypes thanks to recycling by the neonatal Fc receptor, giving it a long half-life and allowing large quantities to accumulate in the blood. Its monomer form is small and versatile, circulating freely to provide systemic immunity through neutralization of pathogens, opsonization to enhance phagocytosis, and activation of the classical complement pathway. In contrast, IgA is mainly found in secretions and mucosal surfaces, IgM is produced early and often exists as a pentamer with higher local activity in initial responses, and IgD and IgE are present in much lower concentrations in serum. These factors together make IgG the predominant circulating antibody in most mammals.

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