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Calcitriol treatment alleviated dopaminergic neuronal injury in the SN. (a) Representative images showing tyrosine‐hydroxylase (TH) immunostaining of dopaminergic neurons within the SN in indicated animal models. Scale bar 100 μm. (b) The number of TH‐positive cells in the SN was counted, n = 4 per group. ***p < .001 compared to the sham operation group. # p < .05 compared to the 6‐OHDA injection group. Data were analyzed by one‐way ANOVA with Tukey's posttest.
