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Electron microscopy of cortical microvessels at postnatal day 21. Microvessels from PTU-treated animals (A and B) and control animals (C and D) appear to have normal endothelial cell (white arrows) and basal membrane structure (black arrows). Panels B and D are enlargements of the framed areas in panels A and C, respectively. Scale bar in panels A and C=1 μm.
