Abstract
Abstract DNA fiber autoradiography was used to measure the rate of replication fork movement and the size of replication units as a function of time during the S phase of synchronized Chinese hamster ovary cells. The rate of fork movement increased by about threefold from early S to later S phase, with the most dramatic change occurring in the first hour of S phase. On the other hand, the size of replication units did not vary significantly during S phase.
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