Scanning electron microscope (SEM) view of the stinging hairs (trichomes) on the stem of a stinging nettle (Urtica dioica). The trichomes act as syringes when touched, penetrating the skin and injecting an irritating mixture of chemicals, including the neurotransmitters serotonin, histamine and acetylcholine.
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WebID:
C01785934
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RM
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1920X1080
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00:00:10.000
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