An antibody is a

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(A) An antibody,also known as an immunoglobulin $(Ig)$,is a protective protein produced by the immune system in response to the presence of a foreign

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Molecule that specifically inactivates an antigen

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(A) An antibody,also known as an immunoglobulin $(Ig)$,is a protective protein produced by the immune system in response to the presence of a foreign substance called an antigen.Antibodies are highly specific; they recognize and bind to specific antigens to neutralize them or mark them for destruction by other immune cells.Therefore,an antibody is a molecule that specifically inactivates an antigen.

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