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The maintenance methyltransferase M.EcoKI recognizes the bipartite DNA sequence 5'-AACNNNNNNGTGC-3', where N is any nucleotide. M.EcoKI preferentially methylates a sequence already containing a methylated adenine at or complementary to the underlined bases in the sequence. We find that the introduction of a single-stranded gap in the middle of the(More)
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