DON FAWCETT / SCIENCE PHOTO LIBRARY DON FAWCETT / SCIENCE PHOTO LIBRARY
Transmission electron micrograph (TEM) of the nucleus of an acinar cell from the pancreas of the bat, Myotis lucifugus. The circular nucleus dominates the image and displays its double- layered nuclear envelope interspersed with nuclear pores. The nucleolus appears more darkly stained (centre of material) and is surrounded by clumps of chromatin - genetic material. Chromatin is also seen towards the nuclear envelope. The cytoplasm surrounding the nucleus contains mitochondria (circular) and the layers of part of the endoplasmic reticulum are visible. Magnification: x22,000 at 10x8 inch size.
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