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Fig. 2 bbp embryos constrict at the margin at 50% epiboly, bursting the yolk.
Still images of WT and bbp embryos at the 1000-cell stage (A, B), 50% epiboly (A′, B′), and 50% epiboly at the burst (A″, B″). bbp embryos constrict just as they reach 50% epiboly. (C and D) Selected frames from time-lapse movies of WT and bbp embryos showing that the constriction occurs rapidly once the embryos have reached 50% epiboly.
                
                    
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                        Acknowledgments
                    
                    
                
                
            
        
        
    
        
            
            
                
                    
                        
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