Fig. 22 Ventral view of a model of the mesodenu (white), splanchnopleuric 

 mesenchyme (green), vasof active cells (yellow) and endothelium (red) of an 

 embryo of two somites. 2, Anlages of dorsal aorta; 3, First intersomitic cleft; 

 4. second intersomitic cleft. 



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