Anti Bodies
Fab fragment has

two antibody binding site
two antigen binding site
one antigen binding site
one antibody binding site

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Anti Bodies
Each IgA antibody molecule consists of

two 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
three polypeptide chain and has two antigen binding site

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