26.0 MB (26.0 MB compressed)
3635 x 2500 pixels
30.7 x 21.1 cm ⏐ 12.1 x 8.3 in (300dpi)
A. DOWSETT, PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY A. DOWSETT, PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
White blood cells. Coloured scanning electron micrograph (SEM) of macrophage white blood cells. These cells are a type of leucocyte present in many major tissues and organs. Free macrophages accumulate at sites of infection as part of the body's immune response. They engulf foreign organisms by a process known as phagocytosis. They are also involved in stimulating immune cells to respond to infection. Magnification unknown.
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