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Computer-generated 3-D reconstruction from case SS46, in which BDA and FR was injected in corresponding whisker representations in SI and SII, respectively. The dense clusters of red and black dots are partially overlapping and interdigitating (see slice diagrams) within a laterally located arrow-shaped lamellar volume (see ventral view), and in dense, medially located clusters. Distinct SI- labeling is seen dorsal to the descending peduncle, as well as in medial parts of the contralateral pontine nuclei. Scale bars, 500 µm.