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Person eats a food that can cause an allergic reaction.
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Allergen and antibodies bind together and a signal is sent out to the body to release histamine.
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The body creates an antibody the protein that finds the food to be harmful.
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The antibody attaches itself to the cells in tissues found all over the body in case the allergen enters the body again.
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Histamine causes irritation and complications with breathing and swelling of certain parts of the body.
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Person develops hives, shortness of breath, anaphylaxis, or even death.