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
generate antigens, thus conferring immunization
kill all the foreign bodies
protect the circulatory system

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Anti Bodies
The immunoglobulin fold is

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

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