To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Supplementary Movie 1 Z-stacks (1.01 μm/section, 41 stacks) of the embryo showing in Fig. 1A. Asymmetric distribution of hypoxia-inducible factor α regulates dorsoventral axis establishment in the early sea urchin embryo Wei-Lun Chang, Yi-Cheng Chang, Kuan-Ting Lin, Han-Ru Li, Chih-Yu Pai, Jen-Hao Chen, and Yi-Hsien Su Development 2017. 144:2940-2950; doi: 10.1242/dev.145052 Download Original Video