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Brightfield photomicrographs of CB1R immunoreactivity in DLPFC area 46 of rhesus monkeys at PN7 days (A), 4.8 months (B), 3.3 years (C), and 15 years (D) of age. In each panel, numbers and hash marks to the right indicate the boundaries of the cortical layers and the layer 6-white matter (WM) border. Scale bar = 200 μm in D (applies to A–D).
