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Brain sections (40 μm) showing oxytocin- (Panels A and B) and CRF-immunoreactivity (Panels C and D) in representative paired (Panels A and C) and isolated (Panels B and D) prairie voles in the hypothalamic PVN. Pictures are shown at 100× magnification. Scale bars = 100 μm. Stained fibers were excluded from analysis.
