Dictionary of Human Evolution and Biology

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Blood serum containing agglutinins (antibodies) to a particular antigen. Plural: antisera. Antisera are used to identify blood types. They are prepared either by inoculating an animal with the antigen in question, which then develops an immune reaction resulting in antibodies which are then harvested, or by harvesting antibodies from animals or people who have had contact with the antigen.

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From "Dictionary of Nursing and Individual Health Care"