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Loading of the Mcm2-7 DNA replicative helicase onto origin-proximal DNA is a critical and tightly regulated event during the initiation of eukaryotic DNA replication. The resulting protein-DNA assembly is called the prereplicative complex (pre-RC), and its formation requires the origin recognition complex (ORC), Cdc6, Cdt1, and ATP. ATP hydrolysis by ORC is required for multiple rounds of Mcm2-7 loading...