Illustration of a glucagon hormone as a glass surface model with indicated, deeper-lying ribbon model on a dark background. The peptide hormone glucagon is the counterpart of the insulin hormone, which is also produced in the pancreas. Glucagon is released as soon as the blood glucose level drops too low. It raises blood glucose levels by drawing on the sugar reserves of the liver and stimulating the formation of new sugar. This illustration is based on structural data from Blundell, T.L., Sasaki, K., Dockerill, S., Tickle, I.J.., by medicalgraphics/F1online

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