Anti Bodies
The main function of antibodies is to

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

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Anti Bodies
The immunoglobulin fold is

both (a) and (b)
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

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