This video shows the dynamics of the apical cell surface of individual cells of the enveloping layer in a killifish embryo. The fluorescent actin is seen to polymerize and depolymerize in cyclic waves that extend and retract these surface protrusions. Two neighboring cells from a continuous epithelium are expressing the fluorescent GFP-actin. The expression of this inserted gene is mosaic, with some cells expressing, and others not.
Visualizations taken from intact embryos, injected with GFP-actin plasmid at 1-cell stage. Filmed during gastrulation.
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