STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Wound scab. Coloured scanning electron micrograph (SEM) of keratinocytes (red) at the site of a skin wound. Keratinocytes are skin cells that contain the protein keratin. They migrate to the site of a wound and form accumulating layers that form the hard protective object called a scab. This covers the wound, allowing skin repair to proceed under the surface. Once the wound has healed, the scab will loosen and fall off. Magnification: x535 when printed 10cm wide.
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