to evaluate the regulation of adenine nucleotide metabolism in relation to purine enzyme activities in rat liver , human erythrocytes and cultured human skin fibroblasts , rapid and sensitive assays for the purine enzymes , adenosine deaminase ( ec 2.5.4.4 ) , adenosine kinase ( ec 2.7.1.20 ) , hyposanthine phosphoribosyltransferase ( ec 2.4.28 ) , adenine phosphoribosyltransferase ( ec 2.4.2.7 ) and 5'-nucleotidase ( ec 3.1.3.5 ) were standardized for these tissues .
C0001407
adenine
C0034140
purine