Insulin, But Not Glucose Lowering Corrects the Hyperglucagonemia and Increased Proglucagon Messenger Ribonucleic Acid Levels Observed in Insulinopenic Diabetes**This work was supported by the Swiss National Fund (Grant 32–46816.96 to J.P. and Grant 32–34086.95 to P.M.), the Institute for Human Genetics and Biochemistry, the Nägeli Wolfermann Foundation, the Horten Foundation, and the Juvenile Diabetes Foundation International (Grant 197124).