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Insulin, protein hormone manufactured in the pancreas by minute areas of tissue called the islets of Langerhans, and then secreted into the blood, where it controls the digestion of carbohydrates. A lack of insulin or a disturbance of its use by the cells is the cause of diabetes.

See also: Diabetes; Hormone.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Inert gas to Jaruzelski, Wojciech