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Co-expression of TH and TOP IIβ in mouse VM. a-c represent an overview of SN and VTA regions. TOP IIβ was found expressed in the nucleus of TH+ neurons in both VTA region (arrows, d-f) and SN region (arrows, g-i) of P1 mice. Red: TH and green: TOP IIβ. Scale bar = 50 μm.
