To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 shows mesoderm cell spreading in an embryo containing an H2A-GFP transgene that allows tracking of cell movement in yw background. FGF controls epithelial-mesenchymal transitions during gastrulation by regulating cell division and apicobasal polarity Jingjing Sun, and Angelike Stathopoulos Development 2018. 145:None-None; doi: 10.1242/dev.161927 Download Original Video