In the human body, the most abundant antibody class is

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IgG is the most abundant antibody class in the human body, accounting for about 75% of all antibody types. It is present in the blood and tissues and provides long-term immunity against infections. IgE and IgM are also important antibody classes but are less abundant than IgG. Cytokines and monoclonal antibodies are not antibody classes but are signaling molecules and laboratory-produced antibodies, respectively.

In the Human Body, the Most Abundant Antibody Class Is