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50.0 MB (3.1 MB compressed)
3732 x 4686 pixels
31.5 x 39.6 cm ⏐ 12.4 x 15.6 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Islet of Langerhans. Transmission Electron Micrograph (TEM) of a slice through a cell of the hormone-secreting islet of Langerhans in the mammalian pancreas. The dark round shapes in white spaces are membrane-bound secretory granules. These contain a densely granular core of hormone separated from the surrounding membrane by a clear space. The islets of Langerhans secrete hormones into the blood - mostly insulin and glucagon, which control blood sugar levels. Magnification x60,000 at 7x9 inch size.
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