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Several type II restriction endonucleases interact with two copies of their target sequence before they cleave DNA. Three such enzymes, NgoMIV, Cfr10I and NaeI, were tested on plasmids with one or two copies of their recognition sites, and on catenanes containing two interlinked rings of DNA with one site in each ring. The enzymes showed distinct patterns of behaviour. NgoMIV and NaeI cleaved the...
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