To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4 shows mesoderm cell spreading in an H2A-GFP transgenic embryo in twih>baz RNAi mutant background that exhibits normal invagination but mild spreading defect later (likely “mild” phenotype). 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