Immunological Techniques
The competitive immunoassay can be used

commonly to detect trace amounts of drugs.
both (a) and (b)
to detect very small amounts of antigen
to detect antibody associated with allergies (IgE)

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Immunological Techniques
In Counter immunoelectrophoresis

electrophoresis will drive the antibody and antigen toward each other
electrophoresis will drive the antibody and antigen parallel to each other
the antibody will migrate towards anode
the antibody will migrate towards cathode

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