An Endonuclease Activity from Escherichia coli Absent from Certain rec- Strains*

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RESUMO

A new endonuclease activity from Escherichia coli which cleaves circular, single-stranded DNA in the presence of added nucleoside triphosphate has been purified. The activity has not been detected in extracts from certain rec- strains and is therefore implicated in genetic recombination.

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