Anti Bodies
Each IgA antibody molecule consists of

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

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Anti Bodies
Papain digest IgG into

two Fab fragments and one Fc fragment
three Fab fragments and two Fc fragments
two Fab fragments and two Fc fragments
three Fab fragments and three Fc fragments

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