Fragmentation of IgG Using Papain

1.Which is the most abundant antibody present in serum?
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2.The enzyme Protease cleaves the IgG antibodies in hinge region and forms 2 fragments. Which of the following are the fragments formed by Papain?
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3.Papain digested antibody is able to promote agglutination,percipitation,opsonization etc.
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4.Which is the chemical used for the further treatment of cleaved fragments of antibody?
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