Islets of Langerhans
The islets of Langerhans are clusters of endocrine cells found in the pancreas; they stain lighter than surrounding cells. The alpha and beta cells produce glucagon and insulin, respectively.
Source
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"OpenStax College, Endocrine Glands. October 17, 2013."
http://cnx.org/content/m44775/latest/Figure_37_05_06.jpg
OpenStax CNX
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