To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S2 A Z-stack of an Embryo with Dl-paGFP That Has Been Activated on the Dorsal Side, Related to Figure 1. A facilitated diffusion mechanism establishes the Drosophila Dorsal gradient Sophia N. Carrell, Michael D. O'Connell, Thomas Jacobsen, Amy E. Pomeroy, Stephanie M. Hayes, and Gregory T. Reeves Development 2017. 144:4450-4461; doi: 10.1242/dev.155549 Download Original Video