CASP3 and Parkinson disease: The level of neuronal apoptosis in the brain of AS-IV-treated PD model rats was evaluated by detecting the expression level of caspase-3 after 14 days (Figure 6(b)), and the results showed that the AS-IV treatment after 14 days, the expression of caspase-3 decreased dramatically (Figure 6(f)), which indicated that neuronal cell death within the brain of PD rats was suppressed.