to determine the contribution of each pathway to dna synthesis independently of each other , [ 14c ] gua and [ 3h ] dg tracer experiments were performed in a double-mutant s-49 mouse t-lymphoma cell line , dguo-l , with purine nucleoside phosphorylase ( ec 2.4.2.1 ) -deficiency and dgtp-feedback-resistant ribonucleotide reductase ( rr , ec 1.17.4.1 ) .
C0030016
ec
C0035547
ribonucleotide reductase