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defined:
A blood protein that is produced in response to and counteracts an antigen. Antibodies are produced in response to disease and help the body fight against the particular disease. In this way, antibodies help the body develop an immunity to disease.
explained:
Listen to a detailed explanation. (Requires the free RealPlayer download) Dr. Jennifer Puck, formerly of the National Human Genome Research Institute's Genetics and Molecular Biology Branch, defines antibody.
illustrated:
View illustration
relatedterms:
lymphocyte, protein
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