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Gastrulation can occur in embryos with acellular regions. The posterior end of an embryo stained with rhodamine-conjugated phalloidin is shown. The extent of cellularization on the posterior end is indicated by arrows. In addition, the entire dorsal surface is acellular (wide arrow). However, caudal cells have involuted and migrated dorsally, as would normally occur during gastrulation. Such embryos typically arrest at approximately this stage.
