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(B) An antibody molecule is $Y$-shaped and consists of four polypeptide chains: two light chains and two heavy chains.Each polypeptide chain has two e

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$N$-terminal

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(B) An antibody molecule is $Y$-shaped and consists of four polypeptide chains: two light chains and two heavy chains.Each polypeptide chain has two ends: an $N$-terminal (amino terminal) and a $C$-terminal (carboxyl terminal).The antigen-binding site is located at the variable region of the antibody,which is situated at the $N$-terminal ends of both the heavy and light chains.Therefore,the $N$-terminal end is responsible for binding with the antigen.

Which terminal end of the antibody protein structure is responsible for binding with the antigen?

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