PCNA and Parkinson disease: Fourteen days after AS-IV treatment, the expression of PCNA, Tuj-1, and TH mRNA increased significantly compared with the model group, proving that after 14 days of AS-IV intervention, the treatment effect was significant (Figures 7(c), 7(d), and 7(e)).Therefore, the striatum of PD rats with AS-IV intervention for 14 days was quantitatively tested for western blotting (Figure 7(a)).