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Why is an antibody molecule represented ...

Why is an antibody molecule represented as `H_(2)L_(2)` ?

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Each antibody molecule has four peptide chains, two small called light chains (represented by L ) and two longer called heavy chains (represented by H).
Hence, an antibody is represented as `H_(2)L_(2)`.
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Why is the structure of an antibody molecule represented as H_(2)L_(2) ? Name anu two types of antibodies produced in a human body.

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