STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Platelets. Coloured scanning electron micrograph (SEM) of a clump of activated platelets from a blood clot. Platelets are fragments of white blood cells. When blood clots, red blood cells (erythrocytes) are trapped within a fibrin protein mesh (beige), which is formed in response to chemicals secreted by the platelets.
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