EMBRYOLOGY OF THALASSEMA MELLITA 



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entirely by the cells of the third quartet (PL II, Fig. 24), which 

 have shoved aside or inwards those of the second. This 

 phenomenon is due to the more rapid cell divisions and growth 



Fig. 4. 



at the posterior end of the embryo, especially of the X group, 

 which, thereby, push all the cells anterior to it toward the future 

 ventral side (Text-Fig. 4, D ). As will be pointed out directly, 



