Figure 6: Immunohistochemical staining. Ovarian dopamine beta hydroxylase (DA βH) shows an obvious increase with L-arginine (5 mg/kg) during the 3-day treatment period (B) compared to the control group (A). (The image of the group that is significantly different from the control group is shown, while other groups are not shown due to lack of meaningful responses). Arrows indicate the positive immunoreaction of DApH in the ovary. Scale bar: 50 μm.