NCIt definition : A process that limits duplication of the genome to once per cell division cycle. In
eukaryotes replication origins are limited to a single initiation event during G1
by temporally separating the assembly of the pre-replication complex (pre-RC) from
the initiation of DNA synthesis. An elaborate mechanism regulates the ordered loading
of proteins at replication origins which convert a poised, but inactive, minichromosome
maintenance (MCM) complex into an enzymatically active helicase.;