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Superhelical [3-H]DNA (replicative form I, RFI) of bacteriophage phiX174 slowly but spontaneously took up 32-P-labeled homologous single-stranded fragments at 4 degrees. Uptake was accelerated by heating to 75 degrees. RFI did not take up single-stranded fragments derived from DNA of Escherichia coli or from separated strands of phage lambda. Uptake was(More)
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