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Appositions of labeled afferents (black) onto the vPAG dopaminergic neurons (brown). Afferents are shown from orexin-ir neurons (A), the locus ceruleus (B), the medial prefrontal cortex (C), and the LDT (D). Arrows indicate terminal appositions with TH-ir cell bodies and dendrites. Scale bar: (in B) A–D,25 μm.
