at the replication fork when the fork is moving. The structure of the previous figure has been altered by folding the DNA on the lagging strand to bring the lagging-strand DNA polymerase molecule in contact with the leading-strand DNA polymerase molecule. This folding process also brings the 3?end of each completed Okazaki fragment close to the start site for the next Okazaki fragment (compare with previous figure) . Because the lagging-strand DNA polymerase molecule is held to the rest of the replication proteins, it can be reused to synthesise successive Okazaki fragments; in this diagram, it is about to let go of its completed DNA fragment and move to the RNA primer that will be synthesised nearby, as required to start the next DNA fragment on the lagging strand.
