Computer-generated 3-D reconstruction from case M28, in which FR and BDA was injected in corresponding whisker barrel representations in SI and MI, respectively. Several largely segregated clusters of labeling are observed within the ipsilateral pontine nuclei. The labeled clusters together form a ring-like volume in the pontine nuclei. Only little labeling is observed medially in the contralateral pontine nuclei. Scale bars, 500 µm.