Biology, 24.04.2020 18:45 sgslayerkingminecraf

What is an allergen?
A chemical substance released by the immune system in allergic reactions that is responsible for many of the symptoms of anaphylaxis, such as vasodilation
A poison or harmful substance
A raised, swollen, well-defined area on the skin resulting from an insect bite or allergic reaction
A substance that causes an allergic reaction

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What is an allergen?
A chemical substance released by the immune system in allergic reactions...

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