STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Healing wound. Coloured scanning electron micrograph (SEM) of a healing wound on the skin. There are red blood cells (erythrocytes) on the skin's surface. Keratinocytes (skin cells that contain the protein keratin, centre) are forming a hard protective layer (scab) over the wound. Magnification: x400 when printed at 10 centimetres wide.
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