Platelet, SEM
Colored scanning electron micrograph (SEM) showing an activated platelet (thrombocyte) trapped in a mesh of fibrin strands (yellow) and erythrocytes The shell (red) of the platelet has collapsed and numerous vesicles (blue) have been released into the wound area. The vesicles contain a large number of enzymes and growth factors, thereby attracting cells needed during the following stages of wound healing. Vessel wall injury triggers the attachment and activation of platelets and the generation of fibrin polymers from fibrinogen. Magnification: brain 15000 when printed at 10 centimeters wide. by PETER SCHUPBACH/SCIENCE PHOTO LIBRARY
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