C57BL/6 mice (20–25 g) received intraperitoneal injection of 30 mg/kg parkinsonian toxin MPTP hydrochloride once a day for 5 days to induce dopaminergic neuron death in the substantia nigra, while the control mice received equal volumes of saline injection. Six micromoles per kg of Tat-βsyn-degron peptide or control Tat-βsyn peptide was i.p. injected into the MPTP-treated mice every 12 h from the first day of MPTP injection until 7 days after the last injection of MPTP. All groups of mice then underwent a rotarod test before they were sacrificed.
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