GCG and type 2 diabetes mellitus: In accordance with previous results [10], total F-GLP-1 (35.4 ± 3.1 vs. 19.0 ± 1.4 pmol/L p < 0.0001, Figure 3a) and active F-GLP-1 (3.4 ± 0.7 vs. 1.4 ± 0.2 pmol/L, p < 0.01, Figure 3b) were higher in the T2D group, compared with the control group.