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Islet from a human pancreas stained with the silver nitrate technique, showing black (argyrophilic) islet cells against unstained background. Image from “The argyrophil reaction in islet cells of adult human pancreas: studies with a new silver nitrate procedure,” by Grimelius, Acta Societatis Medicorum Upsaliensis, 1968. Copyright Informa Healthcare. Published with permission.
