DR DON FAWCETT / SCIENCE PHOTO LIBRARY DR DON FAWCETT / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of a pancreatic acinar cell from the bat Myotis lucifugus. At center is the nucleus, containing a nucleolus (red). The nucleus is bound by a double membrane separated by a small space, the perinuclear space. Nuclear materials (ions & small molecules) diffuse across the inner membrane into the space & out to the cytoplasm. Nuclear pores (gaps) punctuating the membrane represent a second transport system, conveying larger molecules. Ribosomes adhere to the outer nuclear membrane & to the rough endoplasmic reticulum (parallel layers) in the cytoplasm. They are the sites of cellular protein synthesis. Original B/W print is G455/005.
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