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Exp Cell Res. 1986 Aug;165(2):291-7.

Structural organizations of replicon domains during DNA synthetic phase in the mammalian nucleus.


In mammalian cells, it has been shown that adjacent multiple DNA replicons, termed a replicon cluster or a replicon domain, are replicated coordinately in a defined temporal order during the DNA synthetic (S) phase. However, no intranuclear structure of this replicon domain has been revealed in the nucleus labelled with [3H]thymidine at the limited resolution level of autoradiography. By immunofluorescent staining with antibody against 5-bromodeoxyuridine (BrdU), we succeeded in detecting novel, intranuclear ring-like structures of replicating replicon domains that were organized temporarily during the S phase of mammalian cells with incorporated BrdU.

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