AYTOS, BULGARIA - MARCH 14, 2014: Insulin is a peptide hormone, produced by beta cells in the pancreas, and is central to regulating carbohydrate and fat metabolism in the body.

AYTOS, BULGARIA - MARCH 14, 2014: Insulin is a peptide hormone, produced by beta cells in the pancreas, and is central to regulating carbohydrate and fat metabolism in the body. - 26643352

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