Anti Bodies
Each IgA antibody molecule consists of

two polypeptide chain and has one antigen binding site
four polypeptide chain and has two antigen binding site
three polypeptide chain and has two antigen binding site
two polypeptide chain and has two antigen binding site

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Anti Bodies
IgE provides

complement killings of the cells and phagocytosis
immunity against some parasites
All of these
secretions in the body

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