To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 A time-lapse movie of the mitotic division of a cell in the lateral ectoderm of a 24 h embryo. The embryo is derived from an egg injected with Sp-SoxC:GFP and oriented in an animal pole view. The 45 second movie records 225 minutes of development Notch signaling patterns neurogenic ectoderm and regulates the asymmetric division of neural progenitors in sea urchin embryos Dan O. Mellott, Jordan Thisdelle, and Robert D. Burke Development 2017. 144:3602-3611; doi: 10.1242/dev.151720 Download Original Video