Cell nucleus, SEM

Cell nucleus, SEM

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Credit: PROF S. CINTI/SCIENCE PHOTO LIBRARY

Caption: Cell nucleus. Freeze-fracture scanning electron micrograph of a cell from a parathyroid gland. In the lower left is the nucleus (pale green), studded with nuclear pores. These allow large molecules to pass through the double nuclear membrane. The thin structures in the cell cytoplasm are part of the cell's endoplasmic reticulum - a network of membranes that divides the cytoplasm into compartments. The parathyroid glands are pea-shaped glands in the neck that control the level of calcium in the blood. Magnification x19,000 at 5x7cm size. Magnification x9200 at 35mm size.

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Keywords: biological, biology, cell, cell structure, cytology, freeze fracture, freeze-fracture, membrane, microbiology, nuclear, nuclear membr, nuclear membrane, nuclear pore, nucleus, parathyroid cell, pore, scanning electron micrograph

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