the combined use of a pulse-chase labeling protocol , single-cell autoradiography , cytophotometry , and velocity sedimentation in alkaline sucrose gradients showed that , unlike low molecular weight dna ( i.e. , okazaki fragments ) which is ligated soon after replication starts , the joining of nascent replicon-size dna is delayed until g2 .
C0007634
cell
C0242961
replication starts