STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Human hair. Coloured scanning electron micrograph (SEM) of a knotted shaft of blond Eurasian human hair. Hair consists largely of keratin, a fibrous protein. The hair cuticle is formed of overlapping plates or scales, which are thought to reduce hair matting. Magnification: x170 when printed 10cm wide.
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