Normal magnitude of critical period plasticity in cortical barrels of GluN2B+/− and GluN2D−/− mutants. Cytochrome oxidase-stained cortical barrels at P15 after electrocautery of right row-C whisker follicles at P2. Lesioned and intact sides of the same animals (A, B, GluN2B+/+; C, D, GluN2B+/−; E, F, GluN2D+/+; G, H, GluN2D−/−) are shown to the left and right, respectively, in each panel. Arrows indicate row-C barrels. Scale bars, 100 μm.