TH gene expressions in either the midbrain (Figure 2C) or the striatum (Figure 2E) in chronic PD models did not change much, but TH protein expressions declined greatly in both the midbrain (p < 0.01, Figure 2D) and the striatum (p < 0.01, Figure 2F) in PD mice (vs. Normal). This evidence concerns the gene TH and Parkinson disease.