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The intranuclear distribution of newly replicated DNA and of the proliferating cell nuclear antigen (PCNA) was mapped by confocal laser scanning microscopy after simultaneous immunofluorescent labelling of incorporated bromodeoxyuridine (BrdUrd) and PCNA. A mild hydrolysis with HCl followed by an enzymic digestion of DNA was used to produce single-stranded DNA required for BrdUrd immunorevelation, since this procedure preserves PCNA antigenicity. Optical sections obtained with a laser scanningpmid:1358902 fatcat:kcakqyhjbjhntbfzgc2pudtsfe