To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Supplementary Movie 5 Suppression of air sac-like structure formation by sustained apical constriction. The corresponding calculation to Movie 4 was performed, but ka=293 was maintained after t=24×104. Modulation of apical constriction by Wnt signaling is required for lung epithelial shape transition Katsumi Fumoto, Hisako Takigawa-Imamura, Kenta Sumiyama, Tomoyuki Kaneiwa, and Akira Kikuchi Development 2017. 144:151-162; doi: 10.1242/dev.141325 Download Original Video