Radioimmunoassay (RIA) 
Besides fluorescent dyes, many other distinctive ‘labels’ also can be conjugated to antigen and antibodies. The most commonly used labels
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antibody
Identification Of Bacteria By Using Fluorescent Antibody Technique (FAT)
The antibodies produced by bacteria combine with antigen and form antigen-antibody complex. This complex can be observed after fluorescing it
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