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NATURE'S FACES / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY NATURE'S FACES / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Platelets, also called thrombocytes, are a component of blood whose function (along with the coagulation factor) is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot. On a stained blood smear, platelets appear as dark purple spots, about 20% the diameter of red blood cells. Light micrograph, Wright-Giemsa stain. Magnification: 100x.
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