Stinging nettle hairs, light micrograph
Fluorescent light micrograph of stinging hairs, or trichomes, on a stinging nettle (Urtica dioica) leaf. The basal part of trichome cell contains histamine and acetylcholine that can cause pain if they are injected to human body. Magnification: x160 when printed 10cm x 10cm., by MAGDA TURZANSKA / SCIENCE PHOTO LIBRARY
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