Figure 1. Effects of anti-diabetic drugs on the oral glucose tolerance test (OGTT) in ZDF rats.

(A) OGTT in diabetic ZDF rat (▪, black squares), normal ZLC rats (□, white squares), rosiglitazone (○, white circles), metformin (◊, white diamonds) and glimepiride (Δ, white triangles)-treated diabetic ZDF rats. (B) The glucose area under the curve (AUC) during the course of the experiments was calculated. * p<0.05, ** p<0.01.