{HEAD ~ Antigen antibody complex} is formed by the antigen antibody reaction between {TAIL ~ the antigen} in the sample and the antibody fixed on the outer surfaces of the cell membranes of the cells 
{ HEAD ~ Antigen antibody complex } is formed by the antigen antibody reaction between { TAIL ~ the antigen } in the sample and the antibody fixed on the outer surfaces of the cell membranes of the cells
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