C-peptide suppression was greater in patients with GCK-MODY compared to T2D and healthy controls at each time point from 120 min (Figure 1B) (GCK vs T2D, p = 0.04; GCK vs healthy, p = 0.02) to 260 min (GCK vs T2D, p = 0.007; GCK vs healthy, p = 0.006). This evidence concerns the gene GCK and type 2 diabetes mellitus.