Anti Bodies
Each IgA antibody molecule consists of

three 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
four polypeptide chain and has two antigen binding site

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Anti Bodies
The immunoglobulin fold is

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

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