Arterial plasma glucose level and peripheral GIR in conscious dogs during the basal (−40 to 0 min) and experimental (0–240 min) periods treated with vehicle (○) or vildagliptin (▪) (means ± SE; n = 6 per group; *P < 0.05). Arterial plasma glucose level and peripheral GIR in conscious dogs during the basal (−40 to 0 min) and experimental (0–240 min) periods treated with vehicle (○) or vildagliptin (▪) (means ± SE; n = 6 per group; *P < 0.05). Glucose was infused into the portal vein at 4 mg · kg−1 · min−1 in both groups during the experimental period. Dale S. Edgerton et al. Diabetes 2009;58:243-249 ©2009 by American Diabetes Association