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The name "white blood cell" derives from the physical appearance of a blood sample after centrifugation.White cells are found in the buffy coat, a thin, typically white layer of nucleated cells between the sedimented red blood cells and the blood plasma.
The white blood cell differential is a common blood test that is often ordered alongside a complete blood count.The test may be performed as part of a routine medical examination; to investigate certain symptoms, particularly those suggestive of infection or hematological disorders; [5] [6] or to monitor existing conditions, such as blood disorders and inflammatory diseases.
Green peach aphid that has been killed by the fungus Pandora neoaphidis Scale bar = 0.3 mm.. Myzus persicae, known as the green peach aphid, greenfly, or the peach-potato aphid, [2] is a small green aphid belonging to the order Hemiptera.