Anti Bodies
Antibodies can be used

for protein purification
to catalyze chemical reactions
for the localization of proteins in the cell
All of these

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Anti Bodies
The immunoglobulin fold is

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

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

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