Cover legend: Rendition of neural progenitors in the embryonic mouse neocortical germinal zones at E15.5, 24 h after in utero electroporation with pTbr2-Cre × pCAG-Stoplight plasmids. Radial glial cells, short neural precursors, and basal intermediate progenitor cells are visible following transfection. For more information, see the article by Tyler and Haydar in this issue (pages 5106–5119).