Definition: A glycoprotein, obtained from egg whites, that possesses a high affinity for biotin. Labeled avidin is allowed to bind to biotin-tagged antibodies to amplify antigen-antibody reactions that may be difficult to visualize. Ingestion of avidin can cause a biotin deficiency.
[L. avidus, eager fr. aveo, to crave + -in]
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Examples: glitazone, GI cocktail, etc.
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