  Based on the result of an unzipping phase transition by a force in a model of
DNA, we hypothesize that the DnaA-type proteins act as a pulling agent with a
force slightly less than the critical force for unzipping. The dynamic
(space-time) correlation of unzipping then drives the subsequent events of
replication. In such a correlation driven scenario, there is no need of a
replisome as a structural unit and this elusive replisome may not exist at all.
