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For more than 30 years, some of the greatest minds in physiology sought the cause of diabetes mellitus. In 1889 German physicians Joseph von Mering and Oskar Minkowski showed that removal of the pancreas in dogs produced the disease. In 1901 American pathologist Eugene Lindsay Opie described degenerative changes in the clumps of cells in the pancreas known as the islets of Langerhans, thus confirming the association between failure in the functioning of these cells and diabetes. Sharpey-Schafer concluded that the islets of Langerhans secrete a substance that controls the metabolism of carbohydrate. The outstanding event of the early years ...(100 of 21288 words)