Antigen binding site is present in

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(A) An antibody molecule is $Y$-shaped and consists of four polypeptide chains: two light chains and two heavy chains. These chains are held together

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Antibody

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(A) An antibody molecule is $Y$-shaped and consists of four polypeptide chains: two light chains and two heavy chains. These chains are held together by disulfide bonds. The variable region of the antibody,located at the tips of the $Y$-shaped structure,contains the antigen-binding site,also known as the paratope. This site is specific to a particular antigen and allows the antibody to bind to it,thereby neutralizing or marking it for destruction by the immune system. Therefore,the antigen-binding site is present in an antibody.

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