Alexander Lipschiitz 505 



(3) The epithelial new growth elicited by carcinogenic hydrocarbons under 

 certain timing conditions is reversible as is the rule with estrogens. (4) The 

 tumorigenic effect of estrogens, as with carcinogenic hydrocarbons, is de- 

 pendent on the species, each organism being a mosaic of territories in which 

 a homologous territory may react toward estrogen in a different way accord- 

 ing to the species. 



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