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Define Antigen and Antibody. Name any tw...

Define Antigen and Antibody. Name any two diagnostic kits based upon them.

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An antigen is a foreign substance that elicits the formation of an antibody. Antibody is a protein that is synthesised in response to an antigen. Antigen and antibody show high degree of specificity in binding each other. Two diagnostic kits based on antigen-antibody interaction are : (a) ELISA for HIV. (b) Pregnancy test kits.
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