DR L. ORCI, UNIVERSITY OF GENEVA / SCIENCE PHOTO LIBRARY DR L. ORCI, UNIVERSITY OF GENEVA / SCIENCE PHOTO LIBRARY
Light micrograph of an islet of Langerhans from a mammalian pancreas, showing the central position of insulin-secreting beta cells (in green) and the peripheral location of the glucagon-producing cells (in red). Glucagon is a hormone that counteracts insulin. These different cell types are made visible in this micrograph by the use of specific fluorescent antibodies directed against insulin and glucagon. Cells secreting two other hormones, pancreatic polypeptide & somatostatin are also located at the periphery of the islet. Magnification: x525 at 5x4inch, x145 at 35mm size.
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