The 'adenosine cycle' is not a significant route of purine metabolism in mammalian cells

Abstract
The so-called adenosine cycle of purine metabolism may be quantitatively important in mammalian cells. This process is in fact a very minor route of purine metabolism in a number of mammalian cells (Ehrilich ascites cells, 6C3HED ascites cells, human lymphocytes, mouse lymphoma L5178Y and human lymphoblast lines RPMI 6237, RPMI 6410 and Raji.).