CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Dog hairs. Coloured scanning electron micrograph (SEM) of several dog hairs. The outer layer of the hair shaft (the cuticle) can be seen, with overlapping scales of dead cells. The scales are thought to be important in preventing the hair matting. Hair is made up of dead cells containing the protein keratin, which is provided by the living bulb embedded in the skin. Hair grows from this root, as the bulb produces more keratin the hair is pushed upwards. Magnification unknown.
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