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Absence of whisker-specific patterns in NR1KD mice. Cytochrome oxidase histochemistry reveals barrelette patterns in control PrV at P5, P14, and P21, whereas the patterns are absent in NR1KD mice at all ages. Barrelette rows corresponding to whisker rows a-e are indicated in control PrV. All micrographs are from coronal sections and are oriented the same way, with lateral to the right and dorsal to the top. TR, Trigeminal tract. Scale bar, 500 μm.
