Anti Bodies
The main function of antibodies is to

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

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Anti Bodies
Type A blood

contains type B antigens on the surface of red blood cells
can be used to donate to type B individuals
can be used to donate to type AB individuals
can always be used to donate to an Rh+ individual

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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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