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Updated December 11, 2006

Definition: A type of white blood cell in the circulation which is characterized by its ability to uptake certain dyes when stained for examination under the microscope (basophils appear blue). Basophils play a part in the allergic response as they have IgE on their surface, and release chemical mediators causing allergic symptoms when the IgE binds to its specific allergen.
Pronunciation: ba-so-fil

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