McrBC is an endonuclease which cleaves DNA containing methylcytosine* on one or both strands. Sites on the DNA recognized by McrBC consist of two half-sites of the form (G/A)mC. These half-sites can be separated by up to 3 kb, but the optimal separation is 55-103 base pairs.
*5-methylcytosine or 5-hydroxymethylcytosine
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