GCG and very long chain acyl-CoA dehydrogenase deficiency: Whereas insulin was significantly lower in patients with VLCAD (2.3 ± 0.9 mIE/L) compared to patients with CUD (4.5 ± 2.9 mIE/L) (Figure 3a), neither GLP-1 nor glicentin differed between the groups (Figure 3b,c).