Computer-generated 3-D reconstruction from case SS49, in which BDA and FR was injected in corresponding whisker representations in SI and SII, respectively. Narrow 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 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.