Analysis of the ratio of 7-36a vs. 9-36a in T2DM patients following GLP-1 infusion, with or without concomitant administration of a DPP4 inhibitor, found no evidence that circulating levels of 9-36a were correlated with changes in plasma glucose (Zander et al., 2006). The gene discussed is GCG; the disease is type 2 diabetes mellitus.