Scanning electron micrograph of a blood clot on the underside of a sticking plaster that has been used to treat a razor blade cut. Red blood cells (shown in red) and thin fibres of the protein fibrin (beige) can be seen between the gauze fibres of the plaster (blue-grey). Fibrin is a protein formed from the conversion of clotting factors in the blood; the fibrin fibers trap blood cells and platelets to form a solid clot. This not only prevents further bleeding but also protects the open wound from infection.
B0007385. 2011 Wellcome Image Award winner Scanning electron micrograph Collection: Wellcome Images Copyrighted work available under Creative Commons by-nc-nd 2.0 UK: England & Wales, see http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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