MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Stinging nettle stingers. Brightfield illuminated light micrograph of hairs (trichomes) on a stinging nettle (Urtica dioica). These hollow stinging hairs act like hypodermic needles, injecting histamine and other chemicals that produce a stinging sensation when contacted by humans and other animals. Magnification: x100 when printed 10 centimetres wide.
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