TH and hydrops fetalis: Immuno-fluorescent staining confirmed that TH/p75NTR double immunofluorescence further confirmed the ipsilateral upregulation of neuronal p75NTR and decrease of TH-positive DA neurons (P < 0.01, Figs. 3E–3F) , and HF rTMS treatment inhibited the up-regulation of p75NTR expression and increased DA neuron survival in the 6-OHDA rat model (Figs. 3G–3H).