STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hair shaft. Coloured scanning electron micrograph (SEM) of a facial hair (blue). The surrounding layer of facial skin has a typically scale-like surface. Hairs grow from follicles in the underlying layer of the skin (the dermis). The portion of the hair protruding from the skin is made up of dead tissue, largely the protein keratin. Hair grows at around one centimetre every month. Magnification unknown.
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