Rosenstiel Basic Medical Sciences Research Center, Department of Biology, Brandeis University, Waltham, MA 02454, USA. lovett@brandeis.edu
Recent work by clarifies two mechanisms of replication fork assembly in E. coli: in vitro, the presence of a leading nascent strand dictates a PriA/B DnaT-dependent mechanism, whereas a gapped fork specifies PriC-mediated restart.