Define the terms 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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