52.7 MB (2.0 MB compressed)
4724 x 3898 pixels
39.9 x 33.0 cm ⏐ 15.7 x 13.0 in (300dpi)
SCOTT CAMAZINE / M.MARCHATERRE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / M.MARCHATERRE / SCIENCE PHOTO LIBRARY
Eosinophil cell. Coloured Transmission Electron Micrograph (TEM) of a human eosinophil. It is a type of white blood cell (leucocyte) and belongs to the group known as granulocytes. Here, the lobed nucleus is seen (red, at lower left). The cytoplasm is filled with oval-shaped granules which contain enzymes responsible for bacterial destruction. Dense crystals can also be seen in these granules. Eosinophil cells are produced in the bone marrow and they play an important role in the response against allergic and parasitic diseases. They are mobile and destroy cell debris and microorganisms by phagocytosis (engulfing).
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