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Histamine
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Pathways of complement activation
Why scratching an itch actually makes it worse
antihistamines, including Benadryl
Why do people have allergies in the spring?
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Histamine: Media

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Videos

Why scratching an itch actually makes it worse
Understanding the chemical process of itching and why scratching is futile.
Video: © American Chemical Society (A Britannica Publishing Partner)
Why do people have allergies in the spring?
Learn what allergies are and what causes them.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

Pathways of complement activation
The main function of complement proteins is to aid in the destruction of pathogens...
Encyclopædia Britannica, Inc.
antihistamines, including Benadryl
Antihistamines such as Benadryl (diphenhydramine) and Claritin (loratadine) can be...
© Alison Platt Kendall
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