reported that Gcg−/− mice with selective re-expression of intestinal proglucagon did not exhibit glucose intolerance in response to treatment with the GLP-1R antagonist, Exendin 9-39, whereas mice with selective re-expression of pancreatic proglucagon did exhibit glucose intolerance in response to Exendin 9-39 (37). This evidence concerns the gene GLP1R and Glucose intolerance.