Fig. 1From: A detailed review of pathophysiology, epidemiology, cellular and molecular pathways involved in the development and prognosis of Parkinson's disease with insights into screening modelsPathophysiology PD. (Parkinson’s disease is mainly characterized by the neuronal loss within the SN of the brain, which causes motor and non-motor signs such as tremors, bradykinesia, and stiffness.) (Feng et al. 2020)Back to article page