STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Horse mane hair. Coloured scanning electron micrograph (SEM) of a hair from the mane of a Lipizzan horse (Equus caballus). The hair shaft is made up of overlapping scales of dead cells containing the protein keratin. Magnification: x125 when printed at 10 centimetres wide.
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