25.8 MB (2.9 MB compressed)
3500 x 2578 pixels
29.7 x 21.8 cm ⏐ 11.7 x 8.6 in (300dpi)
STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Platelets in a blood clot. Coloured scanning electron micrograph (SEM) of platelet cells (thrombocytes) in a blood clot. They are oval shaped, but when they meet damaged blood vessels they become activated - releasing chemical factors and turning into spiky spheres. The chemical factors cause fibrinogen to come out of solution as fibrin fibres, catching platelets and other blood cells and eventually forming a solid clot. Magnification: x4600 when printed 10 centimetres wide.
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