TH and Parkinson disease: We observed that PD mice led to less expression of the TH (Fig. 1D, F = 19.821, df = 3, P = 0.000) whereas the more expression of the α-syn (Fig. 1D, F = 80.064, df = 3, P = 0.000) than control mice (Fig. 1D, P = 0.000).