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Concept

Origin of replication

The image depicts a conceptual representation of an origin of replication, showing a central sphere with radiating lines and smaller spheres, symbolizing the initiation point for DNA replication in bacteria or eukaryotic cells.

A specific site on a chromosome where DNA copying begins. Bacteria typically have one; the bacterial origin oriC in E. coli is a well-mapped 245-base-pair sequence. Eukaryotes have tens of thousands per genome, marked by binding of the origin recognition complex. Only a subset fire in any given cell cycle, and the selection logic remains partly mysterious.

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