the level of the cytoplasmic ribonucleotide reductase nonheme-iron-containing l2 subunit in regenerating rat liver cells began rising about 2 h before the onset of dna synthesis , rose sharply to a maximum level about 4 h before the dna-synthetic activity reached its peak , and then stayed at this high level even after the cells had finished replicating their dna .
C1335783
ribonucleotide reductase
C0598312
dna synthesis