Anti Bodies
The immunoglobulin fold is

found six times in the IgG molecule
both (a) and (b)
a β-barrel composed of a three- and a four-stranded antiparallel β-sheet
found only in IgG molecules

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Anti Bodies
Each IgA antibody molecule consists of

four polypeptide chain and has two antigen binding site
two 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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