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Antibody

Protein(s) forming a major part of an organism's immune systemEach antibody binds to a specific antigen in a highly specific interaction analogous to a lock and key.An antibody (Ab), or immunoglobulin (Ig), is a large protein belonging to the immunoglobulin superfamily which is used by the immune system to identify and neutralize antigens such as those that exist on bacteria and virus cells, including those that cause disease.

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