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Monocular TTX injection from P40 to P53 decreases NMDAR1 immunostaining in injected eye columns of layer 4 in cat visual cortex. Adjacent sections stained for NMDAR1 immunocytochemistry (A) or for CO histochemistry (B). Note higher levels of NMDAR1 immunostaining (A) and CO activity (B) in patches (arrows) in layer 4 corresponding to the uninjected eye. Scale bar (shown in A): 500 μm.
