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