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Parkinson s disease (PD) is characterized by selective and progressive degeneration of dopaminergic neurons in the substantia nigra (SN).Lipopolysaccharide (LPS) can induce chronic inflammation and has been widely used to study the pathogenesis of PD.In this study, a single intracerebroventricular injection of LPS was used to induce neurotoxic effects on dopaminergic neurons in Sprague-Dawley rats.