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Allergy is an abnormal reaction to certain substances called allergens. These allergens may be inhaled, swallowed or come in contact with the skin to trigger a reaction.
Allergy and Inflammation - ResearchDepartment of MedicineBeth Israel Deaconess Medical CenterCenter for Life Science, 9th floor330 Brookline AvenueBoston , MA 02215617-723-4110617-735-4115 (fax)
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