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Computer-generated 3-D reconstruction from case SS43, 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 located within a laterally located arrow-shaped lamellar volume, as well as in smaller medially located clusters (see ventral view). In this case, the labeling arising from SII is located largely internal to the SI labeling. Restricted labeling is seen dorsal to the descending peduncle and medially in the contralateral pontine nuclei. This case is documented in accompanying paper by Leergaard et al (2004). Scale bars, 500 µm.