?:definition
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Reagents intended to establish points of reference (i.e., calibrate) in immunoassay tests performed to determine either immunoglobulin E (IgE) or histamines released by mast cells when an antigen (allergen) cross-links two attached IgE molecules. These reagents may either be specific for calibration of an allergy-related substance or more frequently appropriate to calibrate a whole set of similar allergy-related substances.
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