Also, the quantities of oxidative stress marker proteins (e.g., CYP2E1, iNOS, and 3‐NT) and junctional complex proteins (e.g., ZO‐1, Occludin, β‐catenin, and E‐cadherin) in the small intestine were significantly decreased in the WD group compared to the control group, but their levels were restored in the PNVs and EA‐treated groups (Figure 6f–h). The gene discussed is OCLN; the disease is Wilson disease.