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Computer-generated 3-D reconstruction from case SS42, in which BDA and FR was injected in corresponding whisker representations in SI and SII, respectively. The clusters of red and black dots are partially overlapping and interdigitating (see slice diagrams) within a laterally located arrow-shaped lamellar volume, as well as in smaller medially located clusters (see ventral view). Sparse labeling is is seen dorsal to the descending peduncle and in the contralateral pontine nuclei. Scale bars, 500 µm.