96 ENZYMES AND DRUG ACTION 



expect the vesicles to be identical. But in fact on the 

 cytological and histological levels, the vesicles pro- 

 duced by different substances appear very different. 

 The general conclusion which we can reach at present 

 is that drugs often exercise one or more of their modes 

 of action through enzyme systems. Some drugs may 

 exercise their action on enzymes only, or even on one 

 enzyme only, but this degree of specificity is very rare. 



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