POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Sheep horn. Coloured scanning electron micrograph (SEM) of a longitudinal section through the horn of a sheep (Ovis sp.). Horns consist of the hard protein keratin (seen here) and a core of bone (not seen). Magnification: x50 when printed at 10 centimetres across.
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