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(C) An antibody molecule is composed of four polypeptide chains: two identical light $(L)$ chains and two identical heavy $(H)$ chains,represented as

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One heavy and one light chain

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(C) An antibody molecule is composed of four polypeptide chains: two identical light $(L)$ chains and two identical heavy $(H)$ chains,represented as $H_2L_2$.Each arm of the $Y$-shaped antibody molecule contains an antigen-binding site.This specific site is formed by the variable regions of one heavy chain and one light chain,which come together to create the paratope that recognizes and binds to a specific antigen.

The antigen binding site in an antibody is formed by:

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