Cover legend: Sequential in utero labeling of earlier-born projection neurons electroporated at embryonic day 14.5 (E14.5) (green) and later-born neurons electroporated at E15.5 (red) in developing mouse neocortex. Dab1, a downstream effector of Reelin, was knocked down in the later-born neurons, and the image was obtained at postnatal day 7. Reelin (cyan) is an essential regulator of the “inside-out” development of the neocortex. Knockdown of Dab1 caused terminal translocation failure of later-born neurons, thus disrupting the inside-out pattern. Magenta is nuclear staining. For more information, see the article by Sekine et al. in this issue (pages 9426–9439).