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Discussion 



DiscHE : Is this substance which is responsible for permeability and for changes 

 in permeability really an enzyme ? The evidence based on such phenomena like 

 competitive inhibitions seems completely consistent with the idea that the mem- 

 brane structure depends on properties of certain proteins in the membrane and 

 for the phenomena which are very familiar about binding of certain substances to 

 the protein, and the competitive inhibition of penetration of substrates by analogous 

 substances, would be adequately explained by specific binding of these substances 



