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We have noticed an error in the sixth paragraph of the Discussion of our article . The corrected paragraph should read:
Another type IV nuclease, GmrSD, found in an E. coli strain targets glucosylated hydroxymethyl-C and may have evolved to cut T4 genome . The resistance of hydroxymethyl-C-containing phage to restriction enzymes but its sensitivity to McrBC , the resistance of glucosylated hydroxymethyl-C to McrBC but sensitivity to GmrSD , and inhibition of GmrSD by T4-coded internal protein  suggest an evolutionary arms race (evolutionary struggle between competing sets of co-evolving genes that develop adaptations and counter-adaptations against each other) between the bacteria and the phage.