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False-colour SEM of an Islet of Langerhans

False-colour SEM of an Islet of Langerhans

P540/0012

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26.1 MB (1.0 MB compressed)

3543 x 2575 pixels

30.0 x 21.8 cm ⏐ 11.8 x 8.6 in (300dpi)

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Credit

DR L. ORCI, UNIVERSITY OF GENEVA / SCIENCE PHOTO LIBRARY DR L. ORCI, UNIVERSITY OF GENEVA / SCIENCE PHOTO LIBRARY

Caption

False-colour scanning electron micrograph of the surface of a single islet of Langerhans from a mammalian pancreas. About one million islets are scattered throughout the pancreas. Some 3,000 cells in each islet secrete a variety of hormones. The most numerous are the insulin-producing (beta) cells which secrete insulin directly into the bloodstream. Insulin's main role is in controlling the transport of glucose; insulin deficiency results in diabetes. Other hormones secreted by different cells in the islet include glucagon, pancreatic polypeptide, and somatostatin. Magnification: x233 at 35mm size.

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