HYDROCARBONS 359 



dibenzanthracene exerts its toxic action bj'- interfering with the storage of 

 vitamin A in the hver. Presumably it competes with \'itamin A for some 

 substance, possibly a protein, with which vitamin A is bound in the liver. 

 On the other hand, this carcinogen does not interfere with the storage of 

 ribofla\'in or of coenzyme I in the liver, as does butter yellow. For a 

 further discussion of the absorption and metabolism of other carcinogenic 

 and related noncarcinogenic compounds, the reader is referred to The 

 Lipids, Vol. II, pages 279-282, and also to Williams. ^^^ 



