Figure 3: Effects of trigonelline on GLP-1R protein expression in sciatic nerve. Densitometric analysis of the bands is expressed as integrated optical density (IOD), corrected for the corresponding β-actin. C, control rats; D, diabetic rats; T, trigonelline-treated diabetes; S sitagliptin-treated diabetes. Data are given as mean SD (). * versus control rats; # versus diabetes rats.