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        Figure 7.2 Sea urchin S. purpuratus embryogenesis.
        

        放大字體  縮小字體
發(fā)布日期：2006-04-15  來源：-  作者：448 x 496 像素

        

        核心提示：a) 60-cell embryo undergoing rapid cell division. Cell fates have
been determined for many of these cells as shown by the color
code for future ectoderm, mesoderm, and endoderm layers.
Cells not yet committed to one of the three layers appear whit
        
  
          
     
    
  
        
  
          
     
    
  
        

        

        

        

Figure 7.2 Sea urchin S. purpuratus embryogenesis.


        

        

        
        
         
        

        




        

        

        

  
        

        

         
        



        

        

        

         
        

        

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