This image shows a mouse fetal neocortex stained for the expression for Satb2 (red), a marker of upper-layer pyramidal cells; Tbr1 (green), a marker of deep-layer pyramidal cells; and neurofilament (fushia), a marker of white matter. Nuclei were counterstained with DAPI (blue). The neuron-specific cytoskeletal regulatory protein Mllt11 contributes to migration and dendritic arborization of upper-layer cortical projection neurons. See the article by Stanton-Turcotte et al. (pages 3931–3948) for details. Cover image: Danielle Stanton-Turcotte.