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Immunohistochemical staining for TH in Nrf2+/+ and Nrf2−/− mice in response to MPTP. (A and B) TH staining of the STR (A) and SN (B) from Nrf2+/+ and Nrf2−/− mice in response to four different doses of MPTP (0, 10, 20, or 30 mg/kg) administered once a day for 5 days. (Scale bar, 50 μm.)
