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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Anti Bodies
IgE provides

All of these
complement killings of the cells and phagocytosis
immunity against some parasites
secretions in the body

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