114 ACTIONS OF NARCOTICS 



denature proteins. They probably do this mainly by 

 changing the organisation of the lipoid residues in the 

 polyptide chains which make up the proteins. This 

 theory of Johnson's has the advantage that it also allows 

 for species variation, since when a given enzyme is taken 

 from different organisms, it usually shows marked vari- 

 ation in ease of denaturation, according to the source 

 from which it has been taken. 



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