Anti Bodies
The main function of antibodies is to

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

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Anti Bodies
The immunoglobulin fold is

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

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