Cover Legend: The distribution of the terminal boutons of neighboring thalamocortical axons (TCAs) in layer IV of somatosensory cortex in the mouse. Individual biocytin-injected TCAs from thalamus to cortex in normal (NOR) and barrelless (BRL) mice were reconstructed in three dimensions to analyze to what extent the TCA arborization pattern and bouton distribution could explain the topographical representation of the whisker follicles. The illustration shows 2425 terminal boutons belonging to three adjacent TCAs plotted as small metallic spheres. The distribution is quantified via plan projection to a tangent plane and subsequent binning with a two-dimensional interpolating histogram. For details, see the article by Gheorghita et al. in this issue (pages 10057–10067).