Anti Bodies
The main function of antibodies is to

generate antigens, thus conferring immunization
chemically combine with the antigen which induces it, inactivate the antigen and protect the body from disease
protect the circulatory system
kill all the foreign bodies

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Anti Bodies
The immunoglobulin fold is

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

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