THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY
Nettle leaf stinging trichomes. Coloured scanning electron micrograph (SEM) of a stinging trichome (hair-like) on a leaf from of a stinging nettle (Urtica dioica). When brushed against, the stinging trichome breaks off and its tip penetrates the skin, injecting acetylcholine and histamine. These chemicals cause the painful and inflammatory response known as a nettle sting or rash.
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