Bar graphs illustrating the effect of l-NAME treatment, 50 mg/kg iv, on the change in ICP, ICP/MAP, and AUC in response to cavernosal nerve stimulation at 2–16 Hz (A). Bar graphs showing the effect of l-NAME treatment on the change in ICP, ICP/MAP, and AUC in response to ic injection of BAY 60-2770 100 ng/kg ic (B). n = no. of experiments; *P < 0.05, paired comparison.