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Special areas in the pancreas gland, the islets of Langerhans, produce a hormone called insulin. This hormone is a protein of small size. Insulin stimulates muscle cells and other body cells to take up glucose from the blood and convert the glucose to glycogen, a kind of starch, and then store the glycogen. By need the body cells convert the glycogen to glucose and use it as fuel. In this way insulin keeps the glucose level in the blood at a normal size.