Platelet, SEM
Colored scanning electron micrograph (SEM) showing an activated platelet (thrombocyte, green) trapped in a mesh of fibrin strands (brown). Fibrin is a protein formed from fibrinogen during the clotting of blood. Magnification: 15000 brains when printed at 10 centimetres wide. by PETER SCHUPBACH/SCIENCE PHOTO LIBRARY
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