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The resulting stretch of newly synthesized DNA that is associated with this lagging or discontinuous strand is called an Okazaki fragment. Okazaki fragments, as with DNA replication in general, requires RNA priming, which serves as the beginning of an Okazaki fragment.
This unzipping takes place in both directions from the replication origins, creating a replication bubble. The replication is therefore said to be bi-directional. Once the two strands are separated a small piece of RNA, called an RNA primer, is attached to the DNA by an enzyme called DNA primase.