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pubmed-article:147449pubmed:abstractTextIncubation of human lymphoid cells with bromodeoxyuridine (BrdUrd) for short periods produces three classes of DNA containing analog: DNAHL (hybrid DNA, density approximately equal to 1.75 g/cm3), DNAint (intermediate density DNA, density approximately equal to 1.71 g/cm3), and DNAHH (DNA with both strands containing analog, density approximately equal to 1.80 g/cm3). Preparations of DNAint yield DNAHH after extensive shearing and/or treatment with single strand specific endonuclease. Cross-linking of pulse-labeled (BrdUrd + 3HdT) DNA in cells by treatment with trioxsalen and near UV light before lysis prevents the appearance of DNAHH.Cross-linking after lysis has little effect. A large fraction of DNAHH is obtained after incubation of cells with caffeine. Extraction of DNA at high salt concentration or cross-linking with trioxsalen and near UV light drastically reduced the amount of DNAHH obtained from caffeine-treated cells. We conclude that most DNAHH arises from in vitro branch migration in isolated DNA growing points.lld:pubmed
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pubmed-article:147449pubmed:articleTitleProduction of DNA bifilarly substituted with bromodeoxyuridine in the first round of synthesis: branch migration during isolation of cellular DNA.lld:pubmed
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