Fig 3. Effect of preincubation with L-arginine, BH4 or L-arginine plus BH4 on the EFS-induced nitric oxide release in mesenteric segments from four- (4W) and eight-week (8W) diabetic rats.

Results (mean ± SEM) are expressed as arbitrary (A.U.)·mg⁻¹ tissue. Two way ANOVA, *P<0.05 vs. without L-arginine or BH4.