EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
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Horse hoof. Coloured scanning electron micrograph (SEM) of a horse's hoof, showing the tubular keratin horn structure. These tubules give the hoof a certain amount of elasticity and produce sebum (grey), which helps to keep the horn cells supple. Magnification: x80, when printed 10 centimetres wide.
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