DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Monocytes. Coloured scanning electron micrograph (SEM) of monocyte white blood cells. These are the largest white blood cells, and are formed in bone marrow. They are actively phagocytic, engulfing and digesting invading bacteria and cell debris. Magnification: x3200 at 6x7cm size.
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