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ChR2 expression after unilateral virus infusion in the SN. (A) Low-magnification images of ChR2-eYFP expression after immunohistochemistry with GFP antibody. (B and C) Higher-magnification images of ChR2-eYFP expression in the contralateral (B) and ipsilateral (C) midbrain as highlighted in A. (Scale bar: 200 µm.)
