+An [Allergen](/wiki/allergen) is a substance, often innocuous to most, that provokes an [Immune Response](/wiki/immune_response) in sensitive individuals. When encountered, these molecules can trigger an allergic reaction, leading to a range of symptoms from mild irritation to severe systemic responses. Common examples include pollen, dust mites, and certain food proteins.
+## See also
+- [Allergy](/wiki/allergy)
+- [Histamine](/wiki/histamine)
+- [Anaphylaxis](/wiki/anaphylaxis)
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