Immunological Techniques
The competitive immunoassay can be used

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

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Immunological Techniques
In Counter immunoelectrophoresis

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

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