Anti Bodies
The immunoglobulin fold is

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

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Anti Bodies
A polyclonal antibody response

is produced by several B cells recognizing different pitopes on the same antigen
is produced only in response to polymeric antigens
violates clonal selection
occurs during the lag phase of the immune response

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