MECHANISMS OF OXIDATION IN TISSUES 

 HN CO HN CO 



1239 



CO C NH + = CO C NH 



CH 



CO 



HN C N 



HN C NH 



Thus a whole series of different ferments effecting dissimilar changes 

 may be required to convert even such a relatively simple body as a 

 purine base into the end-products of its metabolism in the body. 



