STEVE LOWRY / SCIENCE PHOTO LIBRARY STEVE LOWRY / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a fractured section of ox horn. Horn is composed of layers of keratin (the same substance as forms hair and nails). In addition to hair, most land mammals produce a type of hard keratin, known as horny keratin, in the form of nails, hooves, claws, horns and quills. Magnification: x68 at 10cm wide.
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