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Fig. 4. Ilomouialt of ficsli ovaries to old ovariectoniized rat sliowino- mature 

 follicle and normal cuus. Ovaries removed from youno female and lionio- 

 grafted to old lat ()(;4 days after ovariectomy. Va<iinal eornification occurred 

 nine days latei- and four cycles were observed before the oraft was removed 

 52 days after transplantation. (LFO 145.) 



