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Fill in the blanks: IgM and IgG antibodies differ by their heavy chains neither of the listed answers are correct both of the
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IgM and IgG differs by their-----

c. both listed answers are correct.

They differ by both their heavy chains and superstructures. There differences are as followed-

IgM have (mu) type of heavy chain, whereas IgG have gamma type of heavy chain.

IgM exist as a pentamer having 5 Y shaped subunits and 10 antigen binding sites whereas IgG is a monomer with 1 Y shaped subunits and 2 antigen binding sites.

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