Biological Assimilation and Dissimilation of Nitrogen 543 



organisms. Owing to the lack of information on these and related questions, it 

 is not possible at present to formulate more definite statements concerning the 

 connections between the evolution of mechanisms of amino acid dissimilation 

 and the shift of types of nitrogen catabolism. Elucidation of these interesting 

 relationships will have to await the results of further detailed investigations in 

 the field of comparative biochemistry of the enzyme systems and intermediary 

 reactions of nitrogen metabolism. 



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