To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S4 Trol-GFP dynamics in a cultured pupal haltere disc. The movie shows the eversion of the disc and retraction of the peripodial membrane. In the haltere disc, Trol-GFP expression persists for longer than in the wing disc. The Drosophila Hox gene Ultrabithorax controls appendage shape by regulating extracellular matrix dynamics José M. De las Heras, Celia García-Cortés, David Foronda, José Carlos Pastor-Pareja, L. S. Shashidhara, and Ernesto Sánchez-Herrero Development 2018. 145:None-None; doi: 10.1242/dev.161844 Download Original Video