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An antibody (Ab), also known as an immunoglobulin (Ig), is a ... protein ... that is used by the immune system to neutralize pathogens ... . The antibody recognizes a unique molecule of the pathogen, called an antigen ... .
an antigen (Ag) is a molecule or molecular structure ... that can be bound by an antigen-specific antibody or B cell antigen receptor. The presence of antigens in the body normally triggers an immune response.
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