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Triple immunolabeling with antibodies against PV, CR and SOM in coronal sections of developing mouse visual cortex. P0 indicates day of birth. P13 represents the day before eye opening. P16 corresponds to the second day after eye opening. CR expression is present at birth. SOM expression emerges at ∼P5. CR + SOM coexpression (light blue) is present from the onset of SOM expression. PV expression emerges at ∼P13.
