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noun, Immunology.
a protein fraction of blood plasma that responds to stimulation of antigens, as bacteria or viruses, by forming antibodies: administered therapeutically in the treatment of some viral diseases.
any of a group of proteins in blood plasma that includes most known antibodies

gamma globulin n.
A protein fraction of blood serum containing numerous antibodies, used in the prevention and treatment of certain diseases, such as measles, poliomyelitis, and hepatitis.
gamma globulin


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