STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Monocyte white blood cell. Transmission electron micrograph (TEM) of a section through a monocyte white blood cell, showing the cell nucleus (blue), mitochondria (purple ovals) and endoplasmic reticulum (wavy lines). Monocytes, like all white blood cells, are part of the human body's immune system. Magnification: x6000 when printed at 10 centimetres wide.
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