GCG and type 2 diabetes mellitus: - Fasting glicentin: mean amount of total glucagon immunoreactivity eluting at 0.3 Kd (corresponding to the elution of porcine glicentin), lower in T2D than controls- Glicentin after OGTT: increase of glicentin secretion; mean amount of total glucagon immunoreactivity eluting at 0.3 Kd (corresponding to the elution of porcine glicentin) after OGTT: higher in T2D than controls