STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood clot, scanning electron micrograph (SEM). Red blood cells (erythrocytes) are trapped within a fibrin protein mesh. The fibrin mesh is formed in response to chemicals secreted by platelets, fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Magnification: x5000, when printed 10 centimetres wide.
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